Competitive Adsorption of Cd(II) and Zn(II) on Biochar, Loess, and Biochar-loess Mixture

Q4 Environmental Science

Nature Environment and Pollution Technology Pub Date : 2024-03-01 DOI:10.46488/nept.2024.v23i01.022

Y. W. Li, B. W. Zhao, L. Wang, Y. Q. Li, T. Wang, Y. H. Jia, M. L. Zhao

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引用次数: 0

Abstract

Combined heavy metal contamination in soil is a common phenomenon. Biochar amendment into the soil is considered to be an alternative for immobilization remediation of soil contaminated with heavy metals due to its adsorption and alkalization. However, much attention has been paid to the adsorption and immobilization of single heavy metals by biochar. In this paper, the competitive adsorption of Cd(II) and Zn(II) on biochar derived from cotton straw and pig manure at 500℃ (BCS500 and BPM500), loess and biochar-loess mixtures were investigated using the batch equilibrium method. The results showed that the adsorption capacities of biochars, loess, and biochar-loess mixtures to Cd(II) and Zn(II) in the mixed Cd-Zn systems increased with the increase of initial metal concentrations of Cd(II) and Zn(II). The adsorptive capacities of BCS500 and BPM500 to Cd(II) in mixed Cd-Zn system were 33% and 35% less than those in the single Cd(II)systems, while the adsorptive capacities to Zn(II) were 62% and 56% less than those in the single Zn(II) systems. The adsorptive capacities of loess to Cd(II) and Zn(II) in mixed Cd-Zn systems were 29% and 55% less than those in the single metal systems. The adsorptive capacities of loess-BCS500 (LBCS) and loess-BPM500 (LBPM) to Cd(II) in mixed Cd-Zn system were 40% and 38% less than those in the single Cd(II) systems, while the adsorptive capacities to Zn(II) were 63% and 60% less than those in the single Zn(II)systems. Moreover, the competitive adsorptive capacity of Cd(II) is greater than that of Zn(II). It can be seen that when heavy metal pollution with similar nature of multiple elements exists in soil, the amount of adsorbent should be increased to resist the possible weakened adsorption caused by competitive adsorption in order to guarantee an effective absorption treatment.

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生物炭、黄土和生物炭-黄土混合物对镉（II）和锌（II）的竞争性吸附

土壤中的重金属污染是一种常见现象。由于生物炭的吸附和碱化作用，将生物炭添加到土壤中被认为是固定修复重金属污染土壤的一种替代方法。然而，人们对生物炭对单一重金属的吸附和固定作用关注较少。本文采用间歇平衡法研究了棉花秸秆和猪粪衍生的 500℃生物炭（BCS500 和 BPM500）、黄土和生物炭-黄土混合物对 Cd(II) 和 Zn(II) 的竞争性吸附。结果表明，在镉锌混合体系中，生物炭、黄土和生物炭-黄土混合物对镉(II)和锌(II)的吸附能力随着镉(II)和锌(II)初始金属浓度的增加而增加。BCS500 和 BPM500 在 Cd-Zn 混合体系中对 Cd(II) 的吸附容量分别比单一 Cd(II) 体系中低 33% 和 35%，而对 Zn(II) 的吸附容量分别比单一 Zn(II) 体系中低 62% 和 56%。在镉锌混合体系中，黄土对镉(II)和锌(II)的吸附能力分别比单一金属体系低 29% 和 55%。在镉锌混合体系中，黄土-BCS500（LBCS）和黄土-BPM500（LBPM）对镉（II）的吸附容量分别比单一镉（II）体系低 40% 和 38%，而对锌（II）的吸附容量分别比单一锌（II）体系低 63% 和 60%。此外，Cd(II) 的竞争吸附能力大于 Zn(II)。由此可见，当土壤中存在性质相似的多元素重金属污染时，应增加吸附剂的用量，以抵御竞争吸附可能导致的吸附削弱，从而保证吸附处理的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nature Environment and Pollution Technology Environmental Science-Environmental Science (all)

CiteScore

1.20

自引率

0.00%

发文量

159

审稿时长

36 weeks

期刊介绍： The journal was established initially by the name of Journal of Environment and Pollution in 1994, whose name was later changed to Nature Environment and Pollution Technology in the year 2002. It has now become an open access online journal from the year 2017 with ISSN: 2395-3454 (Online). The journal was established especially to promote the cause for environment and to cater the need for rapid dissemination of the vast scientific and technological data generated in this field. It is a part of many reputed international indexing and abstracting agencies. The Journal has evoked a highly encouraging response among the researchers, scientists and technocrats. It has a reputed International Editorial Board and publishes peer reviewed papers. The Journal has also been approved by UGC (India). The journal publishes both original research and review papers. The ideology and scope of the Journal includes the following. -Monitoring, control and management of air, water, soil and noise pollution -Solid waste management -Industrial hygiene and occupational health -Biomedical aspects of pollution -Toxicological studies -Radioactive pollution and radiation effects -Wastewater treatment and recycling etc. -Environmental modelling -Biodiversity and conservation -Dynamics and behaviour of chemicals in environment -Natural resources, wildlife, forests and wetlands etc. -Environmental laws and legal aspects -Environmental economics -Any other topic related to environment