| 铁锰氧化物-微生物负载生物质炭材料对镉和砷的吸附机制 |
| 摘要点击 2229 全文点击 674 投稿时间：2021-06-27 修订日期：2021-08-11 |
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| 中文关键词 重金属 铁锰氧化物 生物质炭 微生物 联合修复 |
| 英文关键词 heavy metals Fe-Mn oxide biochar microbe joint repair |
| 作者 | 单位 | E-mail | | 连斌 | 浙江农林大学环境与资源学院, 临安 311300
浙江农林大学浙江省土壤污染生物修复重点实验室, 临安 311300 | 2210326601@qq.com | | 吴骥子 | 浙江农林大学环境与资源学院, 临安 311300
浙江农林大学浙江省土壤污染生物修复重点实验室, 临安 311300
浙江省农业资源与环境重点实验室, 杭州 310058 | | | 赵科理 | 浙江农林大学环境与资源学院, 临安 311300
浙江农林大学浙江省土壤污染生物修复重点实验室, 临安 311300 | kelizhao@zafu.edu.cn | | 叶正钱 | 浙江农林大学环境与资源学院, 临安 311300
浙江农林大学浙江省土壤污染生物修复重点实验室, 临安 311300 | | | 袁峰 | 杭州西湖环境集团有限公司, 杭州 310013 | |
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| 中文摘要 |
| 制备得到了一种铁锰氧化物-微生物负载生物质炭材料（FM-DB），以同时去除水体中Cd（Ⅱ）和As（Ⅲ）污染.铁锰氧化物-微生物负载生物质炭材料（FM-DB）中铁锰氧化物（FMBO）和山核桃蒲生物质炭（CCSB）的最佳比例为3%+3%.FM-DB耐酸性、机械强度和传质性能良好，在二元体系下对Cd（Ⅱ）和As（Ⅲ）的最大去除率高达77.29%和99.94%.表征分析证实了FM-DB制备成功且具有丰富的官能团结构.FM-DB对Cd（Ⅱ）和As（Ⅲ）单因素吸附实验结果表明，不同条件下复合材料对Cd（Ⅱ）和As（Ⅲ）均有一定的吸附能力，但受到初始pH、平衡时间和初始浓度的影响.FM-DB对Cd（Ⅱ）和As（Ⅲ）吸附动力学和吸附热力学结果表明，复合材料对Cd（Ⅱ）和As（Ⅲ）的吸附平衡时间分别为3.5 h和8 h，最大吸附容量分别为59.27 mg·g-1和84.73 mg·g-1；复合材料对Cd（Ⅱ）和As（Ⅲ）吸附主要受到材料表面电子的交换及共用、络合作用的影响，整个吸附过程则既存在单层吸附，也存在不均匀表面的多层吸附，是一个多步骤过程，可能包括外表面扩散和粒子内扩散.此外，对比一元体系和二元体系下复合材料的去除率发现，在二元体系下，Cd（Ⅱ）和As（Ⅲ）离子间存在相互促进吸附的作用.综上所述，FM-DB是一种高效吸附材料，适用于修复Cd（Ⅱ）和As（Ⅲ）复合污染水体. |
| 英文摘要 |
| A Fe-Mn oxide-microbe combined biochar (FM-DB) was prepared to simultaneously remove Cd(Ⅱ) and As(Ⅲ) contamination in an aqueous system. In the FM-DB, the best ratio of Fe-Mn oxide (FMBO) and carya cathayensis shell biochar (CCSB) was 3%+3%. The material had good acid resistance, mechanical strength, and mass transfer performance, and the maximum removal rates for Cd(Ⅱ) and As(Ⅲ) in the binary system were 77.29% and 99.94%, respectively. Characterization confirmed that the FM-DB was successfully prepared and had a rich functional group structure. The single-factor adsorption test results for Cd(Ⅱ) and As(Ⅲ) showed that the composite material had a certain adsorption capacity affected by initial pH, equilibration time, and initial concentration for Cd(Ⅱ) and As(Ⅲ) under different conditions. The adsorption isotherm and kinetic data indicated the adsorption equilibrium time for Cd(Ⅱ) and As(Ⅲ) was 3.5 h and 8 h, and the maximum capacity was 59.27 mg·g-1and 84.73 mg·g-1, respectively. The adsorption of Cd(Ⅱ) and As(Ⅲ) was mainly affected by the electron exchange, electron sharing, and complexation on the surface of the material. The whole adsorption process was a combination of single-layer adsorption and multi-layer adsorption on an uneven surface. The adsorption process was a multi-step process, including outer surface diffusion and inner particle diffusion. In addition, comparing the removal rate of composite materials in the single-component system and the binary system, a mutual promotion of adsorption between Cd(Ⅱ) and As(Ⅲ) was found under the binary system. In conclusion, oxide-microbe combined biochar could be an efficient adsorption material and was suitable for the remediation of aqueous system pollution caused by Cd(Ⅱ) and As(Ⅲ). |
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