ABSTRACT

Nowadays, special attention has been paid to remediate contaminated media through low-cost and high-efficiency biosorbents. In this research, the sorption of zinc (Zn²⁺) and copper (Cu²⁺) by cattle manure vermicompost (VC) and VC-amended soil and the effect of common ions on sorption was studied. The VC was characterized by using FT-IR spectra, SEM, BET analyses. Isotherm experiments were carried out with different concentrations of Zn²⁺ and Cu²⁺ (0–100 mg L⁻¹) in the presence of 10 mM of background electrolytes (Ca²⁺, Mg²⁺, SO4^2-, and Cl⁻) as the binary system and the absence of other ions (single system). Data of Zn²⁺ and Cu²⁺ adsorption onto VC were fitted to the Langmuir equation. The maximum adsorption capacity (Q_max) of Zn²⁺ and Cu²⁺ onto VC in the single system was 7.27 and 17.73 mg g⁻¹, respectively, which decreased in the following order Ca²⁺ > Mg²⁺ > SO4^2– > Cl ^– in the binary system. The effect of electrolytes on Zn²⁺ adsorption was more significant than Cu²⁺ and the Q_max of Zn²⁺ and Cu²⁺ decreased on average 20.4 and 10.8%, respectively. The VC addition increased adsorption in soil. Results indicate that VC had potential for the removal of Zn²⁺ and Cu²⁺ from single and binary systems.

摘要

如今，人们特别关注通过低成本和高效的生物吸附剂修复受污染的介质。本研究研究了牛粪蚯蚓粪（VC）和VC改良土壤对锌（Zn ²⁺）和铜（Cu ²⁺）的吸附以及常见离子对吸附的影响。通过使用 FT-IR 光谱、SEM、BET 分析来表征 VC。等温线实验，用不同浓度的Zn进行²⁺和Cu ²⁺（0-100毫克的L ^-1中的背景电解质的10mM（Ca的存在下）²⁺，镁²⁺，SO 4 ^2-和Cl ^-) 作为二元系统并且没有其他离子（单一系统）。VC 吸附Zn ²⁺和Cu ^{2+ 的}数据符合Langmuir 方程。在单一系统中，Zn ²⁺和Cu ²⁺在VC 上的最大吸附容量（Q _max）分别为7.27 和17.73 mg g ^-1，其下降顺序为Ca ²⁺ > Mg ²⁺ > SO4 ^2– >氯^-在二进制系统。电解质对Zn ²⁺吸附的影响比Cu ²⁺和Zn ²⁺和Cu ²⁺的Q _max更显着平均分别下降 20.4% 和 10.8%。添加VC增加了土壤中的吸附。结果表明，VC 具有从单一和二元系统中去除 Zn ²⁺和 Cu ^{2+ 的}潜力。