Quantitative contribution of minerals and organics in biochar to Pb(II) adsorption: Considering the increase of oxygen-containing functional groups

被引：23

作者：

Gao, Liang ^{[1
,2
]}

Li, Zhihe ^{[1
]}

Yi, Weiming ^{[1
]}

Wang, Lihong ^{[1
]}

Zhang, Peng ^{[1
]}

Wan, Zhen ^{[1
]}

Li, Yufeng ^{[1
]}

机构：

[1] Shandong Univ Technol, Shandong Res Ctr Engn & Technol Clean Energy, Sch Agr Engn & Food Sci, Zibo 255000, Peoples R China

[2] Shandong Acad Agr Machinery Sci, Jinan 250100, Peoples R China

来源：

JOURNAL OF CLEANER PRODUCTION | 2021年 / 325卷

关键词：

Biochar; Pb(II) adsorption; Oxygen-containing functional group; Mineral; Organic; Quantification; NITRIC-ACID; ENVIRONMENTAL APPLICATION; HEAVY-METALS; REMOVAL; PYROLYSIS; MECHANISM; CADMIUM; POLLUTANTS; CARBON; LEAD;

D O I：

10.1016/j.jclepro.2021.129328

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

An accurate method for understanding the contribution of minerals and organics in biochar to lead adsorption was proposed, while considering the effect of increased oxygen-containing functional groups (OFG). Biochar derived from cotton stalk was prepared by slow pyrolysis at 350 degrees C and 550 degrees C, and then the water-soluble matter (WM), acid-soluble matter (AM) and organic matter (OM) of biochar were separated by washing and pickling. Physicochemical properties and Pb2+ adsorption performance of pristine biochar (BC), water-washed biochar (WB) and acid-washed biochar (AB) have been investigated in detail. The order of the content of separated components in biochar was: OM>AM>WM, and the sequence of Pb2+ sorption capacity of biochar was: BC>WB>AB. The OFG content of all biochar before and after adsorption were quantified by Boehm titration, and the veracious sorption capacity of each fraction of biochar were acquired. The contribution of each component of biochar to Pb2+ sorption was ranked as: AM (69.49-72.69%)>OM (23.93-27.51%)>WM (3.00-3.39%). Furthermore, SEM-EDS, FTIR, XRD and other advanced technologies were used to characterize and analyze all biochar before and after adsorption, indicating that in the adsorption mechanism, minerals were related to ion exchange and precipitation, while organics were relevant to complexation and Pb2+-pi interaction.

引用

页数：8