Journal
NANOMATERIALS
Volume 10, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/nano10020198
Keywords
biochar; nzvi; Cr(VI); orthogonal experiment; adsorption
Categories
Funding
- National Natural Science Foundation of China [21706087, 51808241]
- Guangdong Provincial Key Laboratory of Development and Comprehensive Utilization of Mineral Resources [2017B030314046]
- Qingdao Science and Technology Program [17-3-3-77-nsh]
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Nano-zero-valent iron biochar derived from almond shell (nZVI-ASBC) was used for hexavalent chromium (CR) removal. Experiments showed that pH was the main factor (p < 0.01) that affected the experimental results. At a dosage of 10 mg.L-1 and pH of 2-6, in the first 60 min, nZVI-ASBC exhibited a removal efficiency of 99.8%, which was approximately 20% higher than the removal yield at pH 7-11. Fourier transform infrared spectroscopy results indicated N-H was the main functional group that influenced the chemisorption process. The pseudo second-order dynamics and Langmuir isotherm models proved to be the most suitable. Thermodynamic studies showed that the reaction was exothermic and spontaneous at low temperatures (T < 317 K). Various interaction mechanisms, including adsorption and reduction, were adopted for the removal of Cr(VI) using the nZVI-ASBC composite. The findings showed that the BC-modified nZVI prepared with almond shell exerts a good effect and could be used for the removal of Cr(VI).
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