Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 1, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106955
Keywords
Cetyltrimethyl Ammonium Bromide (CTAB); Chromium(VI); Modification; Removal mechanism
Categories
Ask authors/readers for more resources
Adsorption materials based on Aspergillus niger spores were chemically modified with CTAB to enhance the biosorption capacity of chromic acid ions. The secondary amine (-NH-) played a crucial role in the reduction adsorption process, reducing hexavalent chromium by transferring electrons to unoccupied orbit of Cr(VI). The fungal biological adsorbent showed promising potential for repeated adsorption and desorption of hexavalent chromium without significant decrease.
Adsorption materials based on Aspergillus niger spores were synthesized with chemically modified surfaces, and the CTAB surface modification adsorbent was the best. Zeta potential was in the range of pH 1 to pH 4.38, and CTAB-modified spores (CMS) surface had a positive charge, leading to adsorption of negatively charged chromic acid ions. The biosorption capacity of CMS was also markedly increased. The maximum biosorption capacity reached 177 mg/g following CTAB modification. XPS and FTIR confirmed the importance of secondary amine in the reduction adsorption process. Secondary amine (-NH-) transfer electrons to unoccupied orbit of the Cr(VI) for the reduction of hexavalent chromium. At the same time, chromium(III) is coordinated with O = C-O functional group and (NH+/N+) and adsorbed on the modified spores. The fungal biological adsorbent can adsorb and desorb hexavalent chromium for five consecutive times without a clear decrease.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available