Metal organic framework based composite for chlorpyriphos removal from water
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Date
2022-09
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Chaudhary Charan Singh Haryana Agricultural University
Abstract
The present study was undertaken for adsorptive removal of chlorpyriphos from water by using solvothermally synthesized Metal Organic Frameworks i.e. HKUST-1, ZIF-8 and MIL-53 and their silica loaded composites. Successful characterization was done by different techniques i.e., Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller technique (BET), Particle Size Analyzer (PSA), X-ray diffraction (XRD) and field emission scanning microscopy (FESEM). Results showed that the removal efficiency of HKUST-1@SiO2 was 85% at pH 6, for 20 ppm of concentration of pesticide, 20 mg of HKUST-1@SiO2, in 45 min of contact time and 30°C temperature which was highest among all the synthesized MOFs and their composites. The study of adsorption isotherms and kinetic modelling were also done. Langmuir adsorption isotherm and pseudo second order fitted best for all the samples showing the chlorpyriphos is chemisorbed on the adsorbents. The responsible interaction for adsorption was π-π interactions for all the samples and in composites higher adsorption is due to additional sites provided by silica for the attachment of functional groups from the adsorbate molecules. Reuseablity results showed that HKUST-1@SiO2, MIL-53@SiO2 and ZIF-8@SiO2 can be used for 4, 5 and 3 cycles respectively. HKUST-1@SiO2 exhibited the highest adsorptive removal of chlorpyriphos among all the samples as well as its reusability is also quite high It can be concluded from the present study that HKUST-1@SiO2 is a highly efficient for the removal of chlorpyriphos from water.