Investigation on Pb2+ adsorption characteristics by AAEMs-rich biochar in aqueous solution: Performance and mechanism

Jiahao Jiang; Ruiyu Li; Kaixuan Yang; Yuhang Li; Lei Deng; Defu Che

doi:10.1016/j.envres.2023.116731

Investigation on Pb²⁺ adsorption characteristics by AAEMs-rich biochar in aqueous solution: Performance and mechanism

Environ Res. 2023 Nov 1;236(Pt 1):116731. doi: 10.1016/j.envres.2023.116731. Epub 2023 Jul 28.

Authors

Jiahao Jiang¹, Ruiyu Li², Kaixuan Yang³, Yuhang Li⁴, Lei Deng⁵, Defu Che⁶

Affiliations

¹ State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'a, 710049, China. Electronic address: Jiangjh@stu.xjtu.edu.cn.
² State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'a, 710049, China; Shunde Institue of Inspection, Guangdong Institue of Special Equipment Inspection and Research, Foshan, 528300, China. Electronic address: liruiyu6741297@126.com.
³ State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'a, 710049, China; Shanghai Power Equipment Research Institute Co.,Ltd., Shanghai, 200240, China. Electronic address: yangkaixuan@speri.com.cn.
⁴ State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'a, 710049, China; Xi'an Thermal Power Research Institue Co., Ltd., Xi'an, 710032, China. Electronic address: liyuhang@tpri.com.cn.
⁵ State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'a, 710049, China. Electronic address: leideng@mail.xjtu.edu.cn.
⁶ State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'a, 710049, China.

PMID: 37517492
DOI: 10.1016/j.envres.2023.116731

Abstract

Biochar derived from soybean straw with AAEMs (alkali and alkaline earth metals) enrichment could efficiently remove heavy metals from contaminated water. In this study, the influences of pyrolysis temperature on the physicochemical property and adsorption performance of soybean straw biochar were investigated. The contributions of different adsorption mechanisms were analyzed quantitatively. The results show that the soybean straw biochar exhibits excellent Pb²⁺ adsorption performance (157.2-227.2 mg g^-1), with an order of BC800 > BC400 > BC600 > BC700 > BC500. The mechanisms of metal ion exchange (37.49%-72.58%) and precipitation with minerals (22.38%-58.03%) mainly control the Pb²⁺ adsorption, whereas complexation with organic functional groups (OFGs) and cation-Cπ interaction make the less contribution. The order of cation exchange capacity (CEC) is BC400 > BC800 > BC700 > BC600 > BC500, showing a high correlation (0.965) with the contribution of metal ion exchange with AAEMs. Moreover, Ca exhibits the strongest exchange capacity. The contribution of precipitation is consistent with the variation of soluble CO₃^2- content in biochar. These results suggest that soybean straw biochar rich in AAEMs is a prospective adsorbent for Pb²⁺ elimination.

Keywords: AAEMs; Adsorption; Lead removal; Quantitative analysis; Waste water; soybean straw biochar.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Cations
Charcoal* / chemistry
Lead*
Water

Substances

biochar
Lead
Charcoal
Water
Cations