Abstract
Removal of hazardous herbicides from the aqueous solution is critical for overcoming health-related issues across the wider population. In the current work, we have prepared sodium alginate (SAlg), dextrin, and acrylic acid (AA) based cross-linked hydrogels, composed of bentonite incorporated in the biocompatible hydrogel matrix. This hydrogel composite can remove highly toxic herbicide paraquat (PQ). As-synthesised hydrogel (SAlg/dextrin-cl-PAA) and hydrogel composite (SAlg/dextrin-cl-PAA/bentonite) were further analysed by infra-red spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and thermogravimetric analysis (TGA/DSC). For the first time, PQ adsorption onto sodium and dextrin-based hydrogel was also evaluated. The measured highest removal capacities were 76.923 and 90.909 mg g-1 for the SAlg/dextrin-cl-PAA and SAlg/dextrin-cl-PAA/bentonite, respectively. Pseudo-second-order (PSO) and Langmuir isotherm models have shown to be best suited for accurately describing the adsorption mechanism. A thermodynamics study verified that the adsorption of PQ on adsorbents is spontaneous, favourable and exothermic. Moreover, reusability analysis shows that the adsorbents possess good reproducibility even after six successive cycles. The adsorption results demonstrate that the synthesised adsorbents are very efficient for removing herbicides (PQ) from wastewater.
| Original language | English |
|---|---|
| Article number | 133002 |
| Journal | Chemosphere |
| Early online date | 26 Nov 2021 |
| DOIs | |
| Publication status | E-pub ahead of print - 26 Nov 2021 |
Bibliographical note
Funding Information:Sourbh Thakur would like to thank the Silesian University of Technology , Poland (ID- UB program) for the financial support of the research. Walaa F. Alsanie would like to acknowledge Taif University TURSP program ( TURSP -2020/53 ) for funding. Vijay Kumar Thakur would also like to thank the research support provided by the Royal Academy of Engineering ( IAPP18-19∖295 ), and UKIERI ( DST/INT/UK/P -164/2017 ).
Funding Information:
Sourbh Thakur would like to thank the Silesian University of Technology, Poland (ID-UB program) for the financial support of the research. Walaa F. Alsanie would like to acknowledge Taif University TURSP program (TURSP-2020/53) for funding. Vijay Kumar Thakur would also like to thank the research support provided by the Royal Academy of Engineering (IAPP18-19?295), and UKIERI (DST/INT/UK/P-164/2017).
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