期刊
WATER
卷 13, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/w13050599
关键词
Mg-modified biochar; adsorption; heavy metals; binary system; wastewater
资金
- Major Program of Science and Technology of Sichuan Province [2018SZDZX0028]
- Sichuan Science and Technology Program [2018RZ0125]
- Regional Innovation Cooperation Program of Sichuan Province [2020YFQ0013]
Biochar modification enhances adsorption capacity for heavy metals, with 15% Mg-BC showing the highest efficiency. Adsorption experiments indicate diverse mechanisms including surface precipitation, complexation, and ion exchange.
Biochar modification can enhance the properties associated with porosity and functional groups and has been identified as an effective way to improve adsorption capacity. Modified corncob biochars pretreated by different contents of MgCl2 are obtained through slow pyrolysis; then, this work explores the adsorption abilities towards heavy metals. After modification, biochars mainly impregnate carbon surface with Mg(OH)(2) and MgO particles. The best mass ratio of magnesium (Mg)/feedback is 15% for modified biochar, and 15%Mg-BC has much higher (2.36-9.34 times) metal sorption capacity than pristine biochar. Batch adsorption experiments show that copper (Cu(II)) and lead (Pb(II)) on adsorbents follow a pseudo-second-order model and cadmium (Cd(II)) follows an intraparticle diffusion model. The adsorption isotherm of Cu(II) fits well with the Langmuir model, and Pb(II) and Cd(II) fit with the Freundlich model. In the binary system, modified biochar still effectively removes metals, but the sorption capacity of metals decreases rapidly because of competitive sorption. The main adsorption mechanisms of metals include surface precipitation, cation pi-banding, complexation, and ion exchange. The results show that Mg-modified biochar may be an environmentally friendly material for reducing the water pollution of heavy metals.
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