8 research outputs found
Razgradnja neonikotinoidnih insekticida u ploÄastom fotoreaktoru
The aim of this study was to investigate the photolytic and photocatalytic degradation of neonicotinoids in an aqueous solution. Acetamiprid (ACE) and thiacloprid (TIA), two widely used insecticides, were used as model components. Experiments were performed in a flat-plate photoreactor under conditions of recirculation of the reaction mixture over an immobilised photocatalyst layer (TiO2 modified by urea) using two artificial lamps for simulation of solar irradiation (2.4Ā % UVB and 12Ā % UVA; 300ā700Ā nm). The catalyst used was characterised by XRD, UV/Vis-DRS, BET,
SEM/EDX, and CHNS analysis. All experiments were performed at room temperature and atmospheric pressure, at a recirculation flow rate of 200Ā cm3Ā minā1, and at an initial concentration of ACE and TIA of 10Ā mgĀ dmā3. For most measurements, the reaction mixture was sonicated for 15Ā min immediately before charging the reactor. The study focused on the influence of the pH of the initial solution on the efficiency of photocatalytic and photolytic degradation. It was found that photocatalytic degradation of the two model components was most effective under acidic operating conditions, i.e., at pHĀ 4.5, while photolysis resulted in their minimum degradation. It was also observed that pretreatment of the reaction mixture with ultrasound promoted photocatalytic degradation, while in the case of photolytic degradation, the application of ultrasound did not contribute to better degradation. Finally, photocatalytic degradation of TIA proved to be more successful than photodegradation of ACE (66.4Ā % vs. 25.8Ā %) under identical process conditions.Cilj ovog rada bio je ispitati fotolitiÄku i fotokatalitiÄku razgradnju neonikotinoida u vodenoj otopini. Acetamiprid (ACE) i tiakloprid (TIA), dva naÅ”iroko upotrebljavana insekticida, upotrijebljeni su kao modelne komponente. Istraživanja su provedena u ploÄastom fotoreaktoru u uvjetima recirkulacije reakcijske smjese primjenjujuÄi imobilizirani sloj fotokatalizatora (TiO2 modificiran ureom) uz dvije komercijalne lampe za simulaciju SunÄeva zraÄenja (2,4Ā % UVB i 12Ā % UVA; 300Ā āĀ 700Ā nm). Upotrijebljeni katalizator karakteriziran je analizama XRD, UV/Vis-DRS, BET, SEM/EDX i CHNS. Sva mjerenja provedena su pri sobnoj temperaturi i atmosferskom tlaku, protoku recirkulacije od 200Ā cm3Ā minā1 te uz konstantnu poÄetnu koncentraciju ACE i TIA od 10Ā mgĀ dmā3. Tijekom veÄine mjerenja, reakcijska smjesa izložena je djelovanju ultrazvuka u vremenu od 15Ā min neposredno prije punjenja reaktora. Ispitan je utjecaj poÄetne pH vrijednosti reakcijske smjese na uÄinkovitost fotokatalitiÄke i fotolitiÄke razgradnje. NaÄeno je da je fotokatalitiÄka razgradnja dviju modelnih komponenti najuÄinkovitija u kiselim uvjetima rada, tj. pri pHĀ 4,5, dok je fotoliza rezultirala njihovom neznatnom razgradnjom. TakoÄer, ustanovljeno je da prethodna ultrazvuÄna obrada reakcijske smjese pospjeÅ”uje fotokatalitiÄku razgradnju, dok u sluÄaju fotolitiÄke razgradnje primjena ultrazvuka ne pridonosi boljoj razgradnji. KonaÄno, utvrÄeno je da je fotokatalitiÄka razgradnja TIA uÄinkovitija od fotorazgradnje ACE (66.4Ā % vs. 25.8Ā %) pri jednakim radnim uvjetima
Intensification of Photocatalytic Processes for Water and Wastewater Treatment
Velika ekonomska kriza koja se u posljednjem desetljeÄu osjeÄa u cijelom svijetu ponovno je potakla razmiÅ”ljanja o potrebi āreindustrijalizacijeā. Reindustrijalizacija je ekonomski, druÅ”tveni, ekoloÅ”ki i politiÄki proces upravljanja nacionalnim resursima s ciljem revitalizacije industrije i ostalih gospodarskih aktivnosti, a oslanja se na razvoj i primjenu novih i inovativnih tehnologija. U okviru takvih nastojanja kemijsko inženjerstvo ima odluÄujuÄu ulogu. Prema miÅ”ljenju mnogih znanstvenika reindustrijalizacija i razvoj āindustrije za buduÄnostā temeljit Äe se na tri kljuÄna podruÄja: oÄuvanju i remedijaciji okoliÅ”a, uÅ”tedi energije i poticanju razvoja obnovljivih izvora energije te zaÅ”titi ljudskog zdravlja. To nameÄe i potrebu prilagodbe sustava visokog obrazovanja novim industrijskim i ekonomskim izazovima.
U novije vrijeme sve se ÄeÅ”Äe susreÄemo s postignuÄima koja izlaze iz okvira ātradicionalnogā kemijskog inženjerstva, a uglavnom se zasnivaju na primjeni novog pristupa poznatog pod nazivom intenzifikacija procesa. Znanstvenici i inženjeri intenzivno rade na otkriÄu novih procesnih ureÄaja i tehnika, Å”to predstavlja velik iskorak u odnosu na dosadaÅ”nja saznanja o kemijskim procesnim postrojenjima i omoguÄava razvoj integriranih, sigurnijih, energetski uÄinkovitijih i ekoloÅ”ki prihvatljivijih tehnologija. ZahvaljujuÄi snažnom razvoju znanosti i sve veÄem interesu javnosti za to podruÄje, intenzifikacija procesa postupno se poÄinje izdvajati kao nova disciplina unutar kemijskog inženjerstva.
Zbog opsežnosti problematike u ovom radu ilustrirani su primjeri naprednih izvedbi fotokatalitiÄkih reaktora razvijenih primjenom metodologije intenzifikacije procesa, ukljuÄujuÄi fotokatalitiÄke reaktore s rotirajuÄim diskom/bubnjem, mikroreaktore, membranske reaktore (sa suspendiranim i imobiliziranim fotokatalizatorom), keramiÄke monolite s optiÄkim vlaknima te uobiÄajene izvedbe solarnih reaktora. Istraživanja u tom podruÄju predstavljaju velik izazov s obzirom na moguÄnost primjene takvih sustava za rjeÅ”avanje globalnih problema u zaÅ”titi okoliÅ”a, primarno onih vezanih uz proÄiÅ”Äavanje voda, otpadnih voda, ukljuÄujuÄi i uklanjanje postojanih organskih spojeva i patogenih mikroorganizama iz vodenih resursa.
Ovo djelo je dano na koriÅ”tenje pod licencom Creative Commons Imenovanje 4.0 meÄunarodna.The global economic crisis that has been reigning in the last decade has once again encouraged thinking about the need for āreindustrializationā. Reindustrialization is an economic, social, environmental, and political process of managing national resources in order to revitalize industry and other economic activities, relying on the development and application of new and innovative technologies. Chemical engineering thereby has a crucial role. According to many scientists, the reindustrialization and development of the āindustry for the futureā will be based on three key areas: preservation and remediation of the environment, saving energy and encouraging the development of renewable energy sources, and protecting human health. This also highlights the need to adapt the higher education system to new industrial and economic challenges.
Today, we are confronted more and more with achievements that go beyond the framework of ātraditionalā chemical engineering, which are mainly based on the application of a new approach known as process intensification. Scientists and engineers are intensely working on discovering new process devices and techniques, making a major step forward by enabling the development of integrated, safer, more energy efficient, and environmentally friendly technologies. Due to scientific advancement and growing public interest, process intensification is gradually starting to stand out as a new discipline within chemical engineering.
Due to the scope of this issue, this paper illustrates some examples of advanced photocatalytic reactors developed using process intensification methodology, including rotating disk/drum photocatalytic reactors, microreactors, membrane reactors (with suspended and immobilized photocatalyst), optical fibre ceramic monoliths, and some representatives of the solar reactors. Research in this area represents a major challenge considering the possibility of application of such systems in solving global environmental problems, primarily those related to water and wastewater treatment, including the removal of persistent organic compounds and pathogenic microorganisms from water resources.
This work is licensed under a Creative Commons Attribution 4.0 International License
Catalytic oxidation of BTEX in the monolithic reactor
OneÄiÅ”Äenje okoliÅ”a problem je kojem se u danaÅ”nje vrijeme posveÄuje sve veÄa pažnja. Uslijed naglog industrijskog razvoja te sve veÄeg inteziteta antropogenih aktivnosti u okoliÅ” dospijeva sve veÄi broj oneÄiÅ”ÄujuÄih tvari. Hlapljivi organski spojevi koji pri normalnim uvjetima tlaka i temperature vrlo lako isparavaju predstavljaju jednu od najznaÄajnijih skupina spojeva koji uvjetuju oneÄiÅ”Äenje atmosfere. Postoje brojne metode kojima se nastoji sprijeÄiti emisija hlapljivih organskih spojeva u okoliÅ”. Pritom se katalitiÄka oksidacija pokazala obeÄavajuÄim postupkom razgradnje hlapljivih organskih spojeva te jednim od najuÄinkovitijih i ekonomski najprihvatljivijih postupaka za njihovu oksidaciju/razgradnju. Cilj ovoga rada bio je razvoj keramiÄkog monolitnog katalizatora za katalitiÄku oksidaciju aromatskih hlapljivih organskih spojeva. Razvoj katalizatora ukljuÄivao je nanoÅ”enje katalitiÄki aktivnih komponenata na inertne monolitne nosaÄe, pri Äemu je u prvom sluÄaju koriÅ”ten komercijalni inertni monolitni nosaÄ (kordijerit), a u drugom sluÄaju je tehnologijom 3D tiska (ili aditivne proizvodnje; engl. additive manufacturing) pripremljen kristobalitni monolitni nosaÄ. U oba sluÄaja kao katalitiÄki aktivna komponenta koriÅ”ten je mijeÅ”ani oksid mangana i bakra koji je u ranijim istraživanjima pokazao visoku uÄinkovitost u sliÄnim eksperimentalnim sustavima. Istraživanja su provedena primjenom toluena kao pojedinaÄne komponente i smjese organskih spojeva koja je sadržavala benzen, toluen, etilbenzen i ksilen (BTEX). Reakcije su provedene pri razliÄitim temperaturama uz konstantan ukupan protok reakcijske smjese. Tijekom rada provedena je i usporedba aktivnosti pripremljenih katalizatora s aktivnoÅ”Äu komercijalnog monolitnog katalizatora koji je u svom sastavu sadržavao plemenite metale kao katalitiÄki aktivne komponente. NaÄeno je da se tehnologija aditivne proizvodnje može uspjeÅ”no primijeniti za pripremu monolitnih katalizatora za katalitiÄku oksidaciju hlapljivih organskih spojeva. Kordijeritni monolitni i kristobalitni monolitni nosaÄi sa slojem MnCuOx pokazali su se uÄinkovitim katalizatorima za oksidaciju benzena, toluena, etilbenzena i o-ksilena. Ustanovljeno je da se pripremljeni monolitni katalizatori mogu koristiti kao zamjena za skupe komercijalne katalizatore koji sadrže teÅ”ko dostupne i skupe plemenite metale.Environmental pollution is a problem that is getting more and more attention nowadays. Due to the sudden industrial development and the increasing intensity of anthropogenic activities there is an increasing number of pollutants in the environment. Volatile organic compounds, which under normal pressure and temperature conditions easily evaporate, are one of the most significant groups of compounds that cause atmospheric pollution. There are numerous methods to prevent the release of volatile organic compounds into the environment. Catalytic oxidation proved to be a promising process for the degradation of volatile organic compounds and one of the most efficient and economically most acceptable processes for their oxidation / decomposition. The aim of this work was the development of a ceramic monolithic catalyst for catalytic oxidation of aromatic volatile organic compounds. The development of the catalyst involved the application of catalytically active components to inert monolithic carriers, in which a commercial inert monolithic carrier (cordierite) was used in the first case. In the other case a crystalline monolithic carrier was prepared by 3D printing technology (or additive manufacturing). In both cases mixed manganese and copper oxide were used as a catalytically active component, which in previous studies showed high efficiency in similar experimental systems. Studies were conducted using toluene as a single component and mixture of organic compounds containing benzene, toluene, ethylbenzene and xylene (BTEX). The reactions were carried out at different temperatures and a constant total flow of the reaction mixture. During the work there was also a comparison of activity of the prepared catalyst with the activity of a commercial monolithic catalyst, which in its composition contained noble metals as a catalytically active component. The experiment showed that additive manufacturing can be successfully used for the preparation of monolithic catalysts for catalytic oxidation of volatile organic compounds. During the whole process cordierite monolithic and crystalline monolithic carriers with the MnCuOx layer proved to be effective catalysts for benzene, toluene, ethylbenzene and o-xylene oxidation. It was established that prepared monolithic catalysts can be used as a substitute for expensive commercial catalysts containing heavily accessible and expensive noble metals
Catalytic oxidation of BTEX in the monolithic reactor
OneÄiÅ”Äenje okoliÅ”a problem je kojem se u danaÅ”nje vrijeme posveÄuje sve veÄa pažnja. Uslijed naglog industrijskog razvoja te sve veÄeg inteziteta antropogenih aktivnosti u okoliÅ” dospijeva sve veÄi broj oneÄiÅ”ÄujuÄih tvari. Hlapljivi organski spojevi koji pri normalnim uvjetima tlaka i temperature vrlo lako isparavaju predstavljaju jednu od najznaÄajnijih skupina spojeva koji uvjetuju oneÄiÅ”Äenje atmosfere. Postoje brojne metode kojima se nastoji sprijeÄiti emisija hlapljivih organskih spojeva u okoliÅ”. Pritom se katalitiÄka oksidacija pokazala obeÄavajuÄim postupkom razgradnje hlapljivih organskih spojeva te jednim od najuÄinkovitijih i ekonomski najprihvatljivijih postupaka za njihovu oksidaciju/razgradnju. Cilj ovoga rada bio je razvoj keramiÄkog monolitnog katalizatora za katalitiÄku oksidaciju aromatskih hlapljivih organskih spojeva. Razvoj katalizatora ukljuÄivao je nanoÅ”enje katalitiÄki aktivnih komponenata na inertne monolitne nosaÄe, pri Äemu je u prvom sluÄaju koriÅ”ten komercijalni inertni monolitni nosaÄ (kordijerit), a u drugom sluÄaju je tehnologijom 3D tiska (ili aditivne proizvodnje; engl. additive manufacturing) pripremljen kristobalitni monolitni nosaÄ. U oba sluÄaja kao katalitiÄki aktivna komponenta koriÅ”ten je mijeÅ”ani oksid mangana i bakra koji je u ranijim istraživanjima pokazao visoku uÄinkovitost u sliÄnim eksperimentalnim sustavima. Istraživanja su provedena primjenom toluena kao pojedinaÄne komponente i smjese organskih spojeva koja je sadržavala benzen, toluen, etilbenzen i ksilen (BTEX). Reakcije su provedene pri razliÄitim temperaturama uz konstantan ukupan protok reakcijske smjese. Tijekom rada provedena je i usporedba aktivnosti pripremljenih katalizatora s aktivnoÅ”Äu komercijalnog monolitnog katalizatora koji je u svom sastavu sadržavao plemenite metale kao katalitiÄki aktivne komponente. NaÄeno je da se tehnologija aditivne proizvodnje može uspjeÅ”no primijeniti za pripremu monolitnih katalizatora za katalitiÄku oksidaciju hlapljivih organskih spojeva. Kordijeritni monolitni i kristobalitni monolitni nosaÄi sa slojem MnCuOx pokazali su se uÄinkovitim katalizatorima za oksidaciju benzena, toluena, etilbenzena i o-ksilena. Ustanovljeno je da se pripremljeni monolitni katalizatori mogu koristiti kao zamjena za skupe komercijalne katalizatore koji sadrže teÅ”ko dostupne i skupe plemenite metale.Environmental pollution is a problem that is getting more and more attention nowadays. Due to the sudden industrial development and the increasing intensity of anthropogenic activities there is an increasing number of pollutants in the environment. Volatile organic compounds, which under normal pressure and temperature conditions easily evaporate, are one of the most significant groups of compounds that cause atmospheric pollution. There are numerous methods to prevent the release of volatile organic compounds into the environment. Catalytic oxidation proved to be a promising process for the degradation of volatile organic compounds and one of the most efficient and economically most acceptable processes for their oxidation / decomposition. The aim of this work was the development of a ceramic monolithic catalyst for catalytic oxidation of aromatic volatile organic compounds. The development of the catalyst involved the application of catalytically active components to inert monolithic carriers, in which a commercial inert monolithic carrier (cordierite) was used in the first case. In the other case a crystalline monolithic carrier was prepared by 3D printing technology (or additive manufacturing). In both cases mixed manganese and copper oxide were used as a catalytically active component, which in previous studies showed high efficiency in similar experimental systems. Studies were conducted using toluene as a single component and mixture of organic compounds containing benzene, toluene, ethylbenzene and xylene (BTEX). The reactions were carried out at different temperatures and a constant total flow of the reaction mixture. During the work there was also a comparison of activity of the prepared catalyst with the activity of a commercial monolithic catalyst, which in its composition contained noble metals as a catalytically active component. The experiment showed that additive manufacturing can be successfully used for the preparation of monolithic catalysts for catalytic oxidation of volatile organic compounds. During the whole process cordierite monolithic and crystalline monolithic carriers with the MnCuOx layer proved to be effective catalysts for benzene, toluene, ethylbenzene and o-xylene oxidation. It was established that prepared monolithic catalysts can be used as a substitute for expensive commercial catalysts containing heavily accessible and expensive noble metals
Catalytic oxidation of BTEX in the monolithic reactor
OneÄiÅ”Äenje okoliÅ”a problem je kojem se u danaÅ”nje vrijeme posveÄuje sve veÄa pažnja. Uslijed naglog industrijskog razvoja te sve veÄeg inteziteta antropogenih aktivnosti u okoliÅ” dospijeva sve veÄi broj oneÄiÅ”ÄujuÄih tvari. Hlapljivi organski spojevi koji pri normalnim uvjetima tlaka i temperature vrlo lako isparavaju predstavljaju jednu od najznaÄajnijih skupina spojeva koji uvjetuju oneÄiÅ”Äenje atmosfere. Postoje brojne metode kojima se nastoji sprijeÄiti emisija hlapljivih organskih spojeva u okoliÅ”. Pritom se katalitiÄka oksidacija pokazala obeÄavajuÄim postupkom razgradnje hlapljivih organskih spojeva te jednim od najuÄinkovitijih i ekonomski najprihvatljivijih postupaka za njihovu oksidaciju/razgradnju. Cilj ovoga rada bio je razvoj keramiÄkog monolitnog katalizatora za katalitiÄku oksidaciju aromatskih hlapljivih organskih spojeva. Razvoj katalizatora ukljuÄivao je nanoÅ”enje katalitiÄki aktivnih komponenata na inertne monolitne nosaÄe, pri Äemu je u prvom sluÄaju koriÅ”ten komercijalni inertni monolitni nosaÄ (kordijerit), a u drugom sluÄaju je tehnologijom 3D tiska (ili aditivne proizvodnje; engl. additive manufacturing) pripremljen kristobalitni monolitni nosaÄ. U oba sluÄaja kao katalitiÄki aktivna komponenta koriÅ”ten je mijeÅ”ani oksid mangana i bakra koji je u ranijim istraživanjima pokazao visoku uÄinkovitost u sliÄnim eksperimentalnim sustavima. Istraživanja su provedena primjenom toluena kao pojedinaÄne komponente i smjese organskih spojeva koja je sadržavala benzen, toluen, etilbenzen i ksilen (BTEX). Reakcije su provedene pri razliÄitim temperaturama uz konstantan ukupan protok reakcijske smjese. Tijekom rada provedena je i usporedba aktivnosti pripremljenih katalizatora s aktivnoÅ”Äu komercijalnog monolitnog katalizatora koji je u svom sastavu sadržavao plemenite metale kao katalitiÄki aktivne komponente. NaÄeno je da se tehnologija aditivne proizvodnje može uspjeÅ”no primijeniti za pripremu monolitnih katalizatora za katalitiÄku oksidaciju hlapljivih organskih spojeva. Kordijeritni monolitni i kristobalitni monolitni nosaÄi sa slojem MnCuOx pokazali su se uÄinkovitim katalizatorima za oksidaciju benzena, toluena, etilbenzena i o-ksilena. Ustanovljeno je da se pripremljeni monolitni katalizatori mogu koristiti kao zamjena za skupe komercijalne katalizatore koji sadrže teÅ”ko dostupne i skupe plemenite metale.Environmental pollution is a problem that is getting more and more attention nowadays. Due to the sudden industrial development and the increasing intensity of anthropogenic activities there is an increasing number of pollutants in the environment. Volatile organic compounds, which under normal pressure and temperature conditions easily evaporate, are one of the most significant groups of compounds that cause atmospheric pollution. There are numerous methods to prevent the release of volatile organic compounds into the environment. Catalytic oxidation proved to be a promising process for the degradation of volatile organic compounds and one of the most efficient and economically most acceptable processes for their oxidation / decomposition. The aim of this work was the development of a ceramic monolithic catalyst for catalytic oxidation of aromatic volatile organic compounds. The development of the catalyst involved the application of catalytically active components to inert monolithic carriers, in which a commercial inert monolithic carrier (cordierite) was used in the first case. In the other case a crystalline monolithic carrier was prepared by 3D printing technology (or additive manufacturing). In both cases mixed manganese and copper oxide were used as a catalytically active component, which in previous studies showed high efficiency in similar experimental systems. Studies were conducted using toluene as a single component and mixture of organic compounds containing benzene, toluene, ethylbenzene and xylene (BTEX). The reactions were carried out at different temperatures and a constant total flow of the reaction mixture. During the work there was also a comparison of activity of the prepared catalyst with the activity of a commercial monolithic catalyst, which in its composition contained noble metals as a catalytically active component. The experiment showed that additive manufacturing can be successfully used for the preparation of monolithic catalysts for catalytic oxidation of volatile organic compounds. During the whole process cordierite monolithic and crystalline monolithic carriers with the MnCuOx layer proved to be effective catalysts for benzene, toluene, ethylbenzene and o-xylene oxidation. It was established that prepared monolithic catalysts can be used as a substitute for expensive commercial catalysts containing heavily accessible and expensive noble metals
Xenobiotics in the environment
Problem oneÄiÅ”Äenja okoliÅ”a tema je kojoj se u danaÅ”nje vrijeme posveÄuje sve viÅ”e pažnje. Uslijed naglog industrijskog razvoja i sve veÄeg broja ljudi koji žive na naÅ”em planetu, u okoliÅ” se ispuÅ”ta sve viÅ”e oneÄiÅ”ÄujuÄih tvari. Danas je sve viÅ”e pozornost usmjerena na nove oneÄiÅ”ÄujuÄe tvari, ksenobiotike, u koje se ubrajaju farmaceutici i pesticidi. Zbog svojih fizikalnih i kemijskih svojstava farmaceutici i pesticidi nakupljaju se u okoliÅ”u u sve veÄim koncentracijama te ostavljaju tragove svog Å”tetnog djelovanja na biljnom i životinjskom svijetu te na Äovjeku. O farmaceuticima i pesticidima joÅ” uvijek ne postoji dovoljno podataka da bi se dobio uvid u njihovo ponaÅ”anje i utjecaj na okoliÅ” te kako bi se sprijeÄilo njihovo daljnje negativno djelovanje. U ovome radu prikazano je kako farmaceutici i pesticidi dospijevaju u okoliÅ”, kakve tragove na njemu ostavljaju te koje su moguÄnosti za uklanjanje nastale Å”tete i prevenciju buduÄeg oneÄiÅ”Äenja.The problem of environmental pollution is a topic that is getting more and more attention nowadays. Due to fast industrial development and an increasing number of people living on our planet, more and more pollutants are released into the environment. Today more and more attention is being paid to new pollutants or xenobiotics, to which also pharmaceuticals and pesticides belong. Because of their physical and chemical properties, pharmaceuticals and pesticides accumulate in the environment at higher and higher concentrations, which has negative effects on the plant and animal world as well as on humans. There is still not enough information about pharmaceuticals and pesticides to gain insight into their behaviour and their influence on the environment and to prevent their further negative impact. This paper shows how pharmaceuticals and pesticides get into the environment, what effects they have on it and what options we have to reverse the damage that has already been done and to prevent future contamination
Photocatalytic Degradation of Neonicotinoid Insecticides over Perlite-Supported TiO<sub>2</sub>
The aim of this study was to investigate the photocatalytic degradation of the neonicotinoid insecticide acetamiprid in aqueous solution. Experiments were carried out in a 250 mL batch reactor with recirculation of the reaction mixture and using a UVA-LED radiation source with a heterogeneous UVC-modified perlite-based TiO2 photocatalyst. The photocatalytic degradation of acetamiprid was optimized using a BoxāBehnken design (BBD) of the response surface methodology (RSM). The variables in the process optimization were catalyst type, volume of the reaction mixture, and light radiation intensity. From the experimental data obtained, the conversions of the photocatalytic reactions, the reaction rate constants, and the mean square deviations were calculated. The experimental results have shown that the conversion of the reaction is significantly affected by the type of catalyst, i.e., the method used to immobilise the photocatalytic layer on the perlite granules. The highest conversions of 48.49% were reached with catalysts obtained by impregnation methods, while the conversions were quite low (8.68%) for catalysts obtained by sol-gel methods. It was also found that the highest conversions were achieved with the highest radiation intensity and the smallest volume of reaction mixture
RužiÄka days : International conference 18th RužiÄka Days āToday Science ā Tomorrow Industryā : Proceedings
Proceedings contains articles presented at Conference divided into sections: chemical analysis and synthesis, chemical and biochemical engineering, food technology and biotechnology, medical chemistry and pharmacy, environmental protection and meeting of young chemists