85 research outputs found
Use of NH4Cl for activation of carbon xerogel to prepare a novel efficacious adsorbent for benzene removal from contaminated air streams in a fixed-bed column
Background: Ammonium chloride as an explosive salt has proved to be a prominent activation agent for adsorbents and increase the specific surface area and volume of cavities. In this work, the ability of this substance was scrutinized for activation of carbon aerogel to prepare an efficient adsorbent for benzene removal from air streams. Methods: A carbon xerogel was fabricated from Novallac polymer and activated by ammonium chloride.The changes in structure and morphology were considered via BrunauerĂąïżœïżœEmmettĂąïżœïżœTeller (BET), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Barrett-Joyner-Halenda (BJH), and energy dispersive X-ray (EDX) analyses. Also, comprehensive studies were conducted to vouchsafe the properties of the new adsorbent for benzene removal, using a fixed-bed column mode. Results: The results showed both the successful synthesis and the suitability of the activation process. ACX possessed a higher specific surface area (1008Ă g/m3), compared to the parent carbon xerogel (CX; 543.7Ă g/m3) and organic xerogel (OX; 47Ă g/m3), as well as a higher adsorption capacity. Conclusion: NH4CL is a very beneficial for modifying the structure and morphology of carbon aerogel, and the dynamic behavior of the column with respect inlet benzene concentration can be explained by Yan-Nelson model. Ă© 2020, The Author(s)
Removal of various contaminants from water by renewable lignocellulose-derived biosorbents: a comprehensive and critical review
© 2019, © 2019 Taylor & Francis Group, LLC. Contaminants in water bodies cause potential health risks for humans and great environmental threats. Therefore, the development and exploration of low-cost, promising adsorbents to remove contaminants from water resources as a sustainable option is one focus of the scientific community. Here, we conducted a critical review regarding the application of pristine and modified/treated biosorbents derived from leaves for the removal of various contaminants. These include potentially toxic cationic and oxyanionic metal ions, radioactive metal ions, rare earth elements, organic cationic and anionic dyes, phosphate, ammonium, and fluoride from water media. Similar to lignocellulose-based biosorbents, leaf-based biosorbents exhibit a low specific surface area and total pore volume but have abundant surface functional groups, high concentrations of light metals, and a high net surface charge density. The maximum adsorption capacity of biosorbents strongly depends on the operation conditions, experiment types, and adsorbate nature. The absorption mechanism of contaminants onto biosorbents is complex; therefore, typical experiments used to identify the primary mechanism of the adsorption of contaminants onto biosorbents were thoroughly discussed. It was concluded that byproduct leaves are renewable, biodegradable, and promising biosorbents which have the potential to be used as a low-cost green alternative to commercial activated carbon for effective removal of various contaminants from the water environment in the real-scale plants
Adsorptive potential of ZnâAl and MgâFe layered double hydroxides for the removal of 2ânitrophenol from aqueous solutions
Two layered double hydroxides (LDH) of the type ZnâAl and MgâFe were synthesized, characterized and used as adsorbents to uptake 2ânitrophenol (2âNP) from aqueous solutions. XRD, FTIR, SEM, EDS, AFM and N2 adsorption/desorption curves were used to characterize the ZnâAlâLDH and MgâFeâLDH. The potential of both layered double hydroxides to adsorb 2âNP was investigated by adsorption kinetics, equilibrium, thermodynamics and consecutive adsorption/desorption cycles. The characterization indicated a high crystallinity degree and a wellâorganized and lamellar structure, confirming the efficiency of the synthesis. Elovich was the better kinetic model to describe the 2âNP adsorption onto ZnâAlâLDH, while Pseudoâsecond order was the best for MgâFeâLDH. For both LDHs, the adsorption equilibrium followed the Freundlich model. The process was endothermic, being the maximum adsorption capacities of 290 and 165âmgâgâ1 for ZnâAlâLDH and MgâFeâLDH, respectively. LDHs can be applied for five adsorption/desorption cycles with excellent adsorption capacities. It can be concluded that ZnâAlâLDH and MgâFeâLDH are promising materials to treat waters and wastewaters containing 2ânitropheno
Agricultural biomass/waste as adsorbents for toxic metal decontamination of aqueous solutions
Toxic metals can be present in the environment, causing negative effects on the ecosystem and human health. Although several technologies have been used for decontamination purposes, biosorption is an environmentally friendly and cost-effective alternative to remove toxic metals from wastewater. Agricultural biomasses are a class of biosorbents that offer several advantages, including their low cost, availability in nature, simplicity to be obtained and used as adsorbents. This review article is focused on the use of agricultural biomass materials for the removal of toxic metal(oid)s from contaminated aqueous matrices. In addition, raw and modified forms of these biosorbents are considered as precursors for the preparation of other adsorbents like biochar. Following agricultural biomasses are discussed: i) watermelon, ii) potato, iii) cucumber, iv) peanut, v) almond, vi) walnut and hazelnut, vii) pistachio, and viii) tea waste-based biosorbents. The adsorption potential of the biomasses is exhibited under the optimum experimental conditions, and their characterization and possibility to reuse is also considered. Moreover, isotherm and equilibrium parameters of the metal(oid) adsorption by the biomasses are discussed. Specifically, thermodynamic studies are described in order to better understand the nature of the biosorption process between contaminant and biomass. All these considerations reflect the high potential of agricultural waste-based adsorbents for toxic metal(oid)s removal related to wastewater treatment technologies.Fil: Anastopoulos, Ioannis. University Of Cyprus; ChipreFil: Pashalidis, Ioannis. University Of Cyprus; ChipreFil: Hosseini Bandegharaei, Ahmad. Sabzevar University Of Medical Sciences; IrĂĄn. Islamic Azad University; IrĂĄnFil: Giannakoudakis, Dimitrios A.. Polish Academy of Sciences; PoloniaFil: Robalds, Artis. Animal Health And Environment Bior; LetoniaFil: Usman, Muhammad. University Of Agriculture; PakistĂĄnFil: Escudero, Leticia BelĂ©n. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales. Laboratorio de QuĂmica AnalĂtica para InvestigaciĂłn y Desarrollo; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - Mendoza; ArgentinaFil: Zhou, Yaoyu. Hunan Agricultural University; ChinaFil: Colmenares, Juan Carlos. Polish Academy of Sciences; PoloniaFil: NĂșñez Delgado, Avelino. Universidad de Santiago de Compostela; EspañaFil: Lima, Ăder Claudio. Universidade Federal do Rio Grande do Sul; Brasi
Fabrication of fluorine doped graphene and SmVO4 based dispersed and adsorptive photocatalyst for abatement of phenolic compounds from water and bacterial disinfection
A novel route for preparation of chemically activated carbon from pistachio wood for highly efficient Pb(II) sorption
Review on various strategies for enhancing photocatalytic activity of graphene based nanocomposites for water purification
Effect of metal ions adsorption on the efficiency of methylene blue degradation onto MgFe 2 O 4 as Fenton-like catalysts
Photocatalytic performance and quick recovery of BiOI/Fe3O4@graphene oxide ternary photocatalyst for photodegradation of 2,4-dintirophenol under visible light
Removal of various contaminants from water by renewable lignocellulose-derived biosorbents: a comprehensive and critical review
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