Synthesis of novel adsorbent by intercalation of biopolymer in LDH for the removal of arsenic from synthetic and natural water
| Autor: | Jamel Kheriji, Bhairavi Doshi, Mohamed Chaker Ncibi, Hanen Bessaies, Varsha Srivastava, Béchir Hamrouni, Mika Sillanpää, Sidra Iftekhar |
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| Rok vydání: | 2020 |
| Předmět: |
Tunisia
Environmental Engineering Materials science Intercalation (chemistry) 02 engineering and technology 010501 environmental sciences 01 natural sciences Endothermic process Arsenic Water Purification Crystallinity chemistry.chemical_compound symbols.namesake Biopolymers Adsorption Specific surface area Hydroxides Environmental Chemistry Fourier transform infrared spectroscopy 0105 earth and related environmental sciences General Environmental Science Water Langmuir adsorption model General Medicine Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology Kinetics Chemical engineering chemistry symbols Hydroxide 0210 nano-technology Water Pollutants Chemical |
| Zdroj: | Journal of Environmental Sciences. 91:246-261 |
| ISSN: | 1001-0742 |
| DOI: | 10.1016/j.jes.2020.01.028 |
| Popis: | This study focuses on the synthesis of nanocomposites named CCA and CZA that were prepared by the incorporation of cellulose (CL) in the Ca/Al and Zn/Al layered double hydroxide (LDH), respectively. These materials were then used for the uptake of As(III) and As(V) from aqueous medium. Characterization of both nanocomposites (CCA and CZA) was done using FTIR and Raman analysis to identify the functional groups, N2 adsorption-desorption isotherms to determine the specific surface area and pore geometry and XPS analysis to obtain the surface atomic composition. Some other characters were investigated using simultaneous TGA and DTA and elemental chemical analysis (CHNS/O). The crystallinity of the prepared nanocomposites was displayed by XRD patterns. Furthermore, the sheet-like structure of the LDHs and the irregularity of surface morphology with porous structure were observed by TEM and SEM microphotographs. Optimization of maximum adsorption capacity was adjusted using different parameters including pH, contact time and adsorbent dosage. The pseudo-second-order model was in good fitting with kinetics results. The adsorption isotherm results showed that CZA exhibits better adsorption capacity for As(III) than CCA and the Langmuir isotherm model described the data well for both nanocomposites. Thermodynamic studies illustrated the endothermic nature of CCA and exothermic nature on CZA, as well as the fact that the adsorption process is spontaneous. A real water sample collected from well located in Gabes (Tunisia), has also been treated. The obtained experimental results were confirmed that these sorbents are efficient for the treatment of hazardous toxic species such as. |
| Databáze: | OpenAIRE |
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