MgO-laden biochar enhances the immobilization of Cd/Pb in aqueous solution and contaminated soil
MgO-laden biochar enhances the immobilization of Cd/Pb in aqueous solution and contaminated soil
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载有 MgO 的生物炭增强了水溶液和污染土壤中 Cd/Pb 的固定
DOI：
10.1007/s42773-020-00080-0
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发表时间：
2021-01
期刊：
影响因子：
12.7
通讯作者：
Xingmei Liu
中科院分区：
文献类型：
--
作者：
Yan Wang;Lu Wang;Zhangtao Li;Dong Yang;Jianming Xu;Xingmei Liu
近年来，重金属污染的治理取得了很大进展，但低成本、环境友好型吸附剂的开发仍具有挑战性。以玉米秸秆和MgCl 2·6 H2O为原料，在600 ℃下共热解制备了负载MgO的生物炭，并将其用于水溶液和污染土壤中重金属的固定。采用内梅罗污染指数法和潜在生态风险指数法对修复后土壤中重金属的潜在生态风险进行了评价。结果表明，负载氧化镁的生物炭对Cd 2+的吸附能力明显高于未负载氧化镁的生物炭。准二级动力学方程和Langmuir/Langmuir-Freundlich方程能较好地描述吸附动力学和吸附等温线。用Langmuir-Freundlich方程估算出该树脂对Cd 2+的最大吸附量可达1058.8 mg g− 1。Cd 2+在MgO负载的生物炭复合材料上的吸附主要通过MgO的水解、Mg（OH）2的电离以及Cd 2+和OH−的沉淀作用实现。此外，含氧基团的络合物和Mg（OH）2的吸附也促进了Cd的固定。土壤淋溶试验结果表明，添加4%的MgO生物炭后，TCLP淋溶Cd和Pb的浓度分别降低了22.4%和29.0%，综合污染指数和潜在生态风险分别降低了28.9%和28.5%。这些结果表明，负载氧化镁的玉米秸秆生物炭可能是有前途的应用作为一种低成本的吸附剂，用于污水处理和土壤修复。
Great progress has been made in recent years to alleviate the heavy metal pollution, but the development of low-cost and eco-friendly adsorbents is still challenging. In this work, MgO-loaded biochar, as a potential adsorbent, was successfully synthesized via copyrolysis of corn straw and MgCl2∙6H2O at 600 ℃ and used for heavy metal immobilization in aqueous solution and contaminated soil. Nemerow pollution index and potential ecological risk index methods were also used to assess the potential ecological risk of the metals in soil after remediation. The results showed MgO-laden biochar exhibited a much higher Cd2+adsorption capacity than the pristine biochar. Pseudo-second-order and Langmuir/Langmuir–Freundlich equations could describe the adsorption kinetics and isotherm of Cd2+well. The maximum adsorption capacity of Cd2+could reach to 1058.8 mg g−1estimated by Langmuir–Freundlich equation. Cd2+adsorption on MgO-laden biochar composite mainly involved the hydrolyzation of MgO, ionization of Mg(OH)2and precipitation of Cd2+and OH−. In addition, complexes with oxygen-containing groups and adsorption by Mg(OH)2also enhanced Cd immobilization. The result of soil-leaching test showed that the concentrations of TCLP-leaching (Toxicity Characteristic Leaching Procedure) Cd and Pb reduced by 22.4% and 29.0%, respectively, after 4% of MgO-laden biochar amendment, and the integrated pollution index and potential ecological risk decreased by 28.9% and 28.5%, respectively. These results suggest that MgO-laden corn straw biochar may be promising for application as a low-cost adsorbent for wastewater treatment and soil remediation.
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DOI：
10.1201/b18920
发表时间：
2015-08
期刊：
--
影响因子：
--
作者：
Y. Ok;S. Uchimiya;Scott X. Chang;N. Bolan
通讯作者：
Y. Ok;S. Uchimiya;Scott X. Chang;N. Bolan
生物炭在氧化还原介导反应中的应用
影响因子：
11.4
作者：
Yuan Yong;Bolan Nanthi;Prevoteau Antonin;Vithanage Meththika;Biswas Jayanta Kumar;Ok Yong Sik;Wang Hailong
通讯作者：
Wang Hailong
多孔MgO纳米板有效去除氟化物及其吸附机理
影响因子：
6.2
作者：
Jin, Zhen;Jia, Yong;Liu, Jin-Huai
通讯作者：
Liu, Jin-Huai
影响因子：
15.1
作者：
Lei Wang;Kequan Yu;Jiang-shan Li;Daniel C W Tsang;C. Poon;Jongchan Yoo;K. Baek;S. Ding;D. Ho
通讯作者：
Lei Wang;Kequan Yu;Jiang-shan Li;Daniel C W Tsang;C. Poon;Jongchan Yoo;K. Baek;S. Ding;D. Ho
影响因子：
13.6
作者：
Li, Zhangtao;Wang, Lu;Brookes, Philip
通讯作者：
Brookes, Philip