Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
Bioresour Technol. 2016 Oct;218:1123-32. doi: 10.1016/j.biortech.2016.07.072. Epub 2016 Jul 21.
The objective of this study was to determine the feasibility of using magnesium-alginate/chitosan modified biochar microspheres to enhance removal of phosphate from aqueous solution. The introduction of MgCl2 substantially increased surface area of biochar (116.2m(2)g(-1)), and both granulation with alginate/chitosan and modification with magnesium improved phosphate sorption on the biochars. Phosphate sorption on the biochars could be well described by a simple Langmuir model, and the MgCl2-alginate modified biochar microspheres exhibited the highest phosphate sorption capacity (up to 46.56mgg(-1)). The pseudo second order kinetic model better fitted the kinetic data, and both the Yoon-Nelson and Thomas models were superior to other models in describing phosphate dynamic sorption. Precipitation with minerals and ligand exchange were the possible mechanisms of phosphate sorption on the modified biochars. These results imply that MgCl2-alginate modified biochar microspheres have potential as a green cost-effective sorbent for remediating P contaminated water environment.
本研究旨在确定使用镁-海藻酸钠/壳聚糖改性生物炭微球增强从水溶液中去除磷酸盐的可行性。MgCl2 的引入极大地增加了生物炭的表面积（116.2m2/g），海藻酸钠/壳聚糖造粒和镁改性均提高了生物炭对磷酸盐的吸附。生物炭对磷酸盐的吸附可以用简单的 Langmuir 模型很好地描述，而 MgCl2-海藻酸钠改性生物炭微球表现出最高的磷酸盐吸附容量（高达 46.56mgg-1）。准二级动力学模型更好地拟合了动力学数据，而 Yoon-Nelson 和 Thomas 模型在描述磷酸盐动态吸附方面优于其他模型。矿物沉淀和配体交换是改性生物炭吸附磷酸盐的可能机制。这些结果表明，MgCl2-海藻酸钠改性生物炭微球具有作为一种绿色、经济高效的修复 P 污染水环境的吸附剂的潜力。
