| 磁性椰壳对土壤淋洗废液中As(Ⅲ)的吸附性能分析 |
| |
| 引用本文： | 杨韬,陈靖宇,孙晓霜,皇甫卓曦,余江.磁性椰壳对土壤淋洗废液中As(Ⅲ)的吸附性能分析[J].环境工程,2022,40(1):86-93. |
| |
| 作者姓名： | 杨韬 陈靖宇 孙晓霜 皇甫卓曦 余江 |
| |
| 作者单位： | 1. 四川大学 建筑与环境学院, 成都 610065; |
| |
| 基金项目： | 四川省科技重点攻关项目(2017GZ0383,2017SZ0181)国家重点研发计划项目(2018YFC1802605) |
| |
| 摘 要： | 淋洗技术是土壤重金属(类金属)污染修复的主流技术之一,而淋洗废液存在的二次污染风险则是制约该技术应用的主要因素。通过溶剂沉积法制备磁性椰壳(MCS)改性材料,探究MCS材料对土壤淋洗废液中As(Ⅲ)的最佳吸附条件及去除效果。XPS、SEM等材料表征结果均显示磁性材料可成功负载于椰壳上;EDS、FTIR分析进一步表明,MCS材料可有效吸附As(Ⅲ)。采用拟二级动力学和Freundlich模型来模拟MCS对As(Ⅲ)的吸附过程,结果表明吸附过程是多层吸附行为,主导作用是化学吸附,其中羟基、羧基以及含铁基团的络合作用则是改性材料吸附As(Ⅲ)的主要作用机理。实验条件优化结果显示,在MCS投加量为20 g/L、pH值为9、吸附时间为120 min时,MCS对实际淋洗废液中As(Ⅲ)去除率可高达96.58%,且经过MCS处理后的淋洗废液中As(Ⅲ)的最终含量低于GB 8978—1996《污水综合排放标准》所规定的排放限值(As≤0.5 mg/L)。综上所述,MCS是一种可以有效处理As(Ⅲ)污染土壤淋洗废液的吸附材料。
|
| 关 键 词： | 磁性椰壳(MCS) 淋洗废液 As(Ⅲ) 吸附 |
| 收稿时间： | 2021-04-07 |
ADSORPTION PROPERTIES OF MAGNETIC COCONUT SHELL FOR As(Ⅲ) IN SOIL LEACHING WASTEWATER |
| |
| Affiliation: | 1. College of Architecture and Environment, Sichuan University, Chengdu 610065, China;2. Institute of New Energy and Low Carbon Technology, Sichuan University, Chengdu 610065, China;3. Yibin Institute of Industrial Technology, Sichuan University, Yibin 644000, China;4. Nuclear Power Institute of China, Chengdu 610041, China |
| |
| Abstract: | Leaching technology is one of the mainstream technologies for remediation of soil heavy metal(metal-like) pollution, but the risk of secondary contamination in leaching waste liquid is the main factor restricting its application. This study explored the best adsorption conditions and removal effect of As(Ⅲ) in soil leaching wastewater through solvent deposition of magnetic coconut shell(MCS) prepared by the modified materials. XPS, SEM analysis results showed that magnetic materials could be successfully loaded on the coconut. EDS, FT-IR analysis showed that the As(Ⅲ) could be effectively adsorbed by MCS material. We used the pseudo-second-order kinetic model and Freundlich model to simulate the MCS for the As(Ⅲ) adsorption process, and found that the adsorption process was multilayer adsorption behavior and dominated by chemical adsorption, and the complexation of hydroxyl, carboxyl and iron-containing groups on As(Ⅲ) was the main mechanisms of the adsorption. The removal efficiency of As(Ⅲ) in actual leaching waste water could reach 96.58% under the condition of MCS dosage of 20 g/L, pH of 9 and adsorption time of 120 min. The final content of As(Ⅲ) in the leaching waste water treated by MCS was lower than the discharge limit specified in the Integrated Waste Water Discharge Standard, GB 8978—1996(As≤0.5 mg/L). In conclusion, MCS is an effective adsorption material for the treatment of As(Ⅲ) contaminated soil leaching liquid. |
| |
| Keywords: | |
|
| 点击此处可从《环境工程》浏览原始摘要信息 |
|
点击此处可从《环境工程》下载全文 |
|
