Fast adsorption for removal of methylene blue from aqueuous solutions using of local clay

In the present work we are interested in the study of the adsorption of a methylene blue cationic dye (BM) on natural material such as local clay (CM). For this reason, we carried out a parametric study of adsorption by studying the effect of several important parameters on the decolorizing power of the material used, in particular: contact time, adsorbent concentration, adsorbent dose, pH and temperature. A kinetic study was performed and kinetic models were applied to experimental results such as pseudo first order and pseudo second order. A modeling of the isotherms was carried out by applying known models such as Langmuir and Freundlich. The decolorization percentage was 92 %. Kinetic studies of dye on MB carried out the pseudo-second order at different dye concentration values. The Langmuir model describes satisfactory adsorption on the CM. Thermodynamic studies indicated that dye adsorption process by CM was spontaneous and endothermic in nature. On the other hand, different techniques of characterization of the CM adsorbent were used such as: scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR).

Kinetic and thermodynamicstudy of the adsorption of twodyes:brilliant green and eriochrome black T using a natural adsorbent "sugarcane bagasse".

The aim of this study is to find an effective and inexpensive natural material used as an adsorbent for the textile dyes removal. Indeed, we have been interested in testing the effectiveness of sugarcane bagasse (SB) as a biosorbent to remove brilliant green (BG) and eriochrome black T (EBT). In our experiments, different parameters such as initial dye concentration, contact time, adsorbent dose and solution temperature have been analyzed in a batch system. Similarly, the studies of thermodynamic, kinetic and adsorption isotherm have been evaluated.The sugarcane bagasse (SB) without any modification has been characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM).The maximum adsorption capacity of BG and EBT on the SB adsorbent has been 37.58 and 12.30 mg.g-1respectively, for a concentration of 40mg.g-1 at a temperature of 20°C and 1g.L-1 of adsorbent. The results of the adsorption kinetics have proved that the pseudo-second order model correctly describes the adsorption phenomenon of the two dyes studied. The Langmuir and Freundlich isotherms have been applied to experimental equilibrium data. The various thermodynamic parameters such as Gibbs free energy (ΔG°), enthalpy (ΔH°) and standard entropy (ΔS°) have indicated that the adsorption is spontaneous and endothermic in brilliant green and exothermic in eriochrome black T.

Copper-impregnated on natural material as promising catalysts for the wet hydrogen peroxide catalytic oxidation of Methyl Green

Promising catalyst of cooper impregnated on natural material (CT) synthesized via wet impregnation method, in order to enhance the catalytic wet peroxide oxidation during the degradation of organic matter in a batch reactor under mild conditions. Three different percentages of copper metal (2.5, 5 and 7.5 %) incorporated into CT material which are referred as follows 2.5% Cu-CT, 5% Cu-CT and 7.5% Cu-CT were investigated in the oxidation catalytic of methyl green (MG) dye. The chemical composition, the morphology and the structure of raw CT and all prepared samples, were investigated by X-ray fluorescence, Fourier transform infrared spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM) to get a better understand concerning the catalytic activity behavior of Cu-CT catalyst. Different variable examined the catalytic activity of the samples obtained such as initial concentrations of dye, copper (Cu) loading, temperature and H2O2 effect was investigated to enhance the MG conversion. CWPO experiments showed that 2.5% Cu-CT catalysts have the maximum catalytic activity during the degradation of MG dye. The presence of copper on CT support ameliorates the hydroxyl radicals in the reaction medium after the contact with H2O2 thus enhanced the catalytic conversion of the CT pristine. The optimum conditions showing an important catalytic conversion of MG dye (95 %) at 2.5% of copper loading, 139.10-3 mol.L-1 H2O2, temperature of 40 °C and at pH 6.0 during  30 min as a reaction time. 

Studies of the adsorption kinetics process for removal of methylene blue dye by residue of grenadine bark extraction

This study makes it possible to prove that an inexpensive material, namely the residue of grenadine bark extraction (GB), can be used to remove a dye from the textile industry, in particular methylene blue (MB). For this reason, different techniques of characterization of the GB adsorbent have been used such as: scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and the zero charge point. On the other hand, batch studies have been used to evaluate the effect of initial concentration, contact time, adsorbent dose, pH and temperature on the variation in uptake capacity. In this case, the results show that a very fast adsorption kinetics reaching 98% within the first 10 minutes. Additionally, kinetic studies of dye on MB carried out the pseudo-second order at different dye concentration values. Besides, the Langmuir model describes satisfactory adsorption on the GB. Further, thermodynamic studies have indicated that dye adsorption process by grenadine bark (GB) was spontaneous, physisorption and endothermic in naturel

High-efficiency of Peanut Shell Biosorbents in Cationic Dye Removal for Water Pollution Treatment

This study investigates the adsorption of Acid Fuchsin (AF) dye on the peanut shells (PS) surface. The PS material was characterized using FTIR and SEM-EDX studies, which identified the presence of cellulose compounds. Multiple adsorption parameters, such as pH, temperature, adsorbent dose, initial dye concentration, kinetics, isotherm, and thermodynamics, were analyzed. As per the results, the adsorption of AF onto the PS surface followed the pseudo-second-order with Langmuir isotherm models and an adsorption capacity of 111.11 mg g⁻¹. These findings demonstrate that PS adsorbent is highly effective in eliminating cationic dyes from aqueous solutions

Adsorption of carbofuran (2,3-dihydro-2,2-dimethyl benzofuran-7-yl carbamate) and fenamiphos (ethyl 4-methylthio-m-tolylisopropyl phosphoramidate) by homoionic montmorillonite - humic acid complex

L'étude de l'adsorption a montré l’influence du cation de saturation des complexes argilo-humiques sur le phénomène d’adsorption des deux pesticides carbofuran et phénamiphos. L’analyse des résultats des différents complexes argilo-humiques (Me-M-HA) a montré que l'adsorption du phénamiphos est plus importante que celle du carbofuran. L'analyse des spectres d’absorption infra-rouge a montré des modifications importantes dans les fréquences de vibration des groupements fonctionnels des deux molécules pesticides au cours de leur adsorption par les complexes argilo-humique. L’analyse par diffraction aux rayons-X des complexes argilo-humiques traité par le carbofuran ou le phénamiphos a montré une augmentation significative de la distance réticulaire d001, indiquant la possibilité de pénétration de ces molécules dans l'espace interlamellaire des complexes saturés par des cations polyvalents

First draft genome assembly of the Argane tree (Argania spinosa)

Background: The Argane tree (Argania spinosa L. Skeels) is an endemic tree of southwestern Morocco that plays an important socioeconomic and ecologic role for a dense human population in an arid zone. Several studies confirmed the importance of this species as a food and feed source and as a resource for both pharmaceutical and cosmetic compounds. Unfortunately, the argane tree ecosystem is facing significant threats from environmental changes (global warming, over-population) and over-exploitation. Limited research has been conducted, however, on argane tree genetics and genomics, which hinders its conservation and genetic improvement. Methods: Here, we present a draft genome assembly of A. spinosa. A reliable reference genome of A. spinosa was created using a hybrid de novo assembly approach combining short and long sequencing reads. Results: In total, 144 Gb Illumina HiSeq reads and 7.2 Gb PacBio reads were produced and assembled. The final draft genome comprises 75 327 scaffolds totaling 671 Mb with an N50 of 49 916 kb. The draft assembly is close to the genome size estimated by k-mers distribution and covers 89% of complete and 4.3 % of partial Arabidopsis orthologous groups in BUSCO. Conclusion: The A. spinosa genome will be useful for assessing biodiversity leading to efficient conservation of this endangered endemic tree. Furthermore, the genome may enable genome-assisted cultivar breeding, and provide a better understanding of important metabolic pathways and their underlying genes for both cosmetic and pharmacological purposes

First draft genome assembly of the Argane tree (Argania spinosa) [version 2; peer review: 2 approved]

BACKGROUND : The Argane tree (Argania spinosa L. Skeels) is an endemic tree of mid-western Morocco that plays an important socioeconomic and ecologic role for a dense human population in an arid zone. Several studies confirmed the importance of this species as a food and feed source and as a resource for both pharmaceutical and cosmetic compounds. Unfortunately, the argane tree ecosystem is facing significant threats from environmental changes (global warming, over-population) and over-exploitation. Limited research has been conducted, however, on argane tree genetics and genomics, which hinders its conservation and genetic improvement. METHODS : Here, we present a draft genome assembly of A. spinosa. A reliable reference genome of A. spinosa was created using a hybrid de novo assembly approach combining short and long sequencing reads. RESULTS : In total, 144 Gb Illumina HiSeq reads and 7.6 Gb PacBio reads were produced and assembled. The final draft genome comprises 75 327 scaffolds totaling 671 Mb with an N50 of 49 916 kb. The draft assembly is close to the genome size estimated by k-mers distribution and covers 89% of complete and 4.3 % of partial Arabidopsis orthologous groups in BUSCO. CONCLUSION : The A. spinosa genome will be useful for assessing biodiversity leading to efficient conservation of this endangered endemic tree. Furthermore, the genome may enable genome-assisted cultivar breeding, and provide a better understanding of important metabolic pathways and their underlying genes for both cosmetic and pharmacological.DATA AVAILABILITY: All of the A. spinosa datasets can be retrieved under BioProject accession number PRJNA294096: http://identifiers.org/ bioproject:PRJNA294096. The raw reads are available at NCBI Sequence Reads Archive under accession number SRP077839: http://identifiers.org/insdc.sra:SRP077839. The complete genome sequence assembly project has been deposited at GenBank under accession number QLOD00000000: http://identifiers. org/ncbigi/GI:1408199612. Data can also be retrieved via the International Argane Genome Consortium (IAGC) website: http://www.arganome.org.https://f1000research.compm2021BiochemistryGeneticsMicrobiology and Plant Patholog