生物炭负载锰掺杂纳米四氧化三铁吸附除锑研究  

Study on the Adsorption and Removal of Antimony by Biochar Supported Mn Doped Nano Fe3O4

作　　者：闫敏琪 杨勇 杨淳轲 史惠祥[1] YAN Minqi;YANG Yong;YANG Chunke;SHI Huixiang(College of Environmental&Resource Sciences,Zhejiang University,Hangzhou 310058,China;Jiashan Qiushi Environmental Testing Co.,Ltd.,Jiaxing 314108,China)

机构地区：[1]浙江大学环境与资源学院,浙江杭州310058 [2]嘉善求是环境检测有限公司,浙江嘉兴314108

出　　处：《水处理技术》2024年第5期41-46,共6页Technology of Water Treatment

基　　金：浙江省“领雁”研发攻关计划项目(2023C03149);长江生态环境保护修复城市驻点跟踪研究(2022-LHYJ-02-0503-02)

摘　　要：为提升晶态铁系金属氧化物的吸附容量、提高对印染废水中高溶解度和稳定性的Sb(OH)_(6)^(-)去除效果,制备生物炭负载锰掺杂纳米四氧化三铁,探究其吸附效果与联用生物炭负载提升吸附容量的机理。吸附实验表明,在初始pH为7.0±0.5、温度25℃、初始锑浓度200μg/L条件下,吸附剂除锑的最优条件为锰铁比0.3、负载比0.2、投加量0.3 g/L,此时模拟废水中锑含量可降至38μg/L,在更低投加量、更温和pH、室温条件下有更高的吸附容量。且吸附剂的循环使用性能较好,经三个吸附-脱附循环后吸附量仍达86%。吸附容量机理研究发现,生物炭负载提升吸附容量的机理为缓解团聚、提高吸附剂表面带正电强度、增强其对Sb(OH)_(6)^(-)的离子交换吸附作用。To improve the adsorption capacity of crystalline iron oxides and the removal effect of Sb(OH)_6~-with high solubility and stability in printing and dyeing wastewater,biochar supported Mn doped nano Fe_3O_(4) was prepared,and the effect and mechanism of combining biochar loading to enhance the adsorption capacity of the adsorbent were explored.The adsorption experiment showed that under the conditions of initial pH=7.0±0.5,temperature=25℃,and initial antimony concentration=200μg/L,the optimal conditions for antimony removal by the adsorbent were manganese iron ratio=0.3,load ratio=0.2,and dosage=0.3 g/L.At this time,the antimony content in the simulated wastewater can be reduced to 38μg/L,with higher adsorption capacity under lower dosage,milder pH,and room temperature conditions.And the adsorbent has good cycling performance,with an adsorption capacity of 86%after three adsorption desorption cycles.Research on the adsorption capacity mechanism found that the mechanism of biochar loading to increase the adsorption capacity was to alleviate agglomeration,improve the positive electric strength of the adsorbent surface,and enhance its ion exchange adsorption of Sb(OH)_6~-.

关 键 词：锑 印染废水 吸附 生物炭负载锰掺杂纳米四氧化三铁 

分 类 号：TQ424[化学工程]