Adsorption of Basic Dyes Using Walnut Shell-based Biochar Produced by Hydrothermal Carbonization
- 17 Downloads
Hydrothermal carbon(HC) was prepared from walnut shells, which are abundant in Northeastern China. The prepared HC was used as a precursor to produce nitric acid modified carbon(MC). The hydrothermal carbonization included dehydration and decarboxylation processes wherein the hemicellulose was completely decomposed and the cellulose was partly decomposed, with some oxygen-containing functional groups being produced. The aromaticity, specific surface area and pore content of the HC increased, but its polarity decreased. With 6 mol/L nitric acid and a modification time of 15 min, the specific surface area and pore content decreased, but the proportion of oxygen-containing functional groups on the surface increased significantly, thereby improving the dye adsorption performance. The adsorption of methylene blue and malachite green was best described by the pseudo-second-order kinetic and Langmuir isotherm models. The adsorption capacity of MC was determined to be much larger than that of HC.
KeywordsBiochar Adsorption Walnut shell Hydrothermal carbonization Basic dye
Unable to display preview. Download preview PDF.
- Suo L. L., Li S. J., Li Y. T., Zhang L., Zhang X., Chem. J. Chinese Universities, 2016, 37(11), 2043Google Scholar
- Zhou Q., Duan Y. F., Mao Y. Q., Zhu C., Proceedings of the CSEE, 2013, 33(29), 10Google Scholar
- Li L., Lu Y. C., Liu Y., Sun H. W., Liang Z. Y., J. Agro-Environ. Sci., 2012, 31(11), 2277Google Scholar
- Liang F., Mao Y. L., Liu X. P., Chen S. T., Yan Y. S., Shao P. Y., Chemical Reagents, 2015, 37(1), 21Google Scholar
- Gao Y., Wang W., Pang Y. L., Cao L. Y., Guo Y. P., Zhao C., Chem. J. Chinese Universities, 2017, 38(12), 2156Google Scholar
- Qiao N., Yao D. M., Wang D., Sun Y. C., Tang Q., Chinese J. Environ. Eng., 2016, 10(7), 3841Google Scholar