磁性吸附催化材料对水体污染物的净化效能  

Efficiency of Magnetic Adsorption Catalytic Materials for Pollutants Removal in Water

作　　者：张万辉 欧桦瑟 曹雁 陈宇佳 殷从焱 唐杰鹏 ZHANG Wanhui;OU Huase;CAO Yan;CHEN Yujia;YIN Congyan;TANG Jiepeng(Guangdong Jianke Innovation Technology Research Institute Co.,Ltd.,Guangzhou 510500,China;School of Environment,Jinan University,Guangzhou 511443,China)

机构地区：[1]广东建科创新技术研究院有限公司,广东广州510500 [2]暨南大学环境学院,广东广州511443

出　　处：《净水技术》2022年第12期106-112,共7页Water Purification Technology

基　　金：国家自然科学基金面上项目(51778270)。

摘　　要：环境水体污染的治理是目前的热点问题,研发高效可行的污染控制技术具有重要意义。研究采用湿式浸渍法合成具有磁性与催化活性的改性磁性活性炭(MAC),使用表征仪器对材料的合成状态、表面形貌、化学特性等进行测定,并设计针对目标污染的吸附、降解和循环试验,评估MAC的应用价值以及在实际水体中的处理效果。通过简单可行的步骤,合成表面负载磁性铁氧化物的MAC,比表面积为457.5 m~2/g,孔径以2~50 nm的介孔和微孔(<2 nm)为主,表现出超顺磁性,饱和磁化强度为3 596 A/m,可通过磁性从介质中分离。通过吸附试验,发现MAC对4-氯酚的吸附过程可分为两个阶段:第一个阶段为快速吸附阶段,在30 min的时间内可实现吸附材料84%的吸附能力;第二个阶段为慢速吸附阶段,经过120 min的吸附反应,吸附材料逐渐达到吸附平衡。吸附过程符合Langmuir和Freundlich模型,制备的吸附材料经过5次循环使用,仍能去除82%的4-氯酚。针对河涌污染水体的试验表明,投加HO之后,MAC材料能有效削减其中的COD和氨氮,从而实现有机污染物的吸附和净化。The treatment of contaminants in environmental water bodies has attracted concern, and it is important to develop efficient and feasible control technologies. In this study, modified magnetic activated carbon(MAC) with magnetic and catalytic activity was synthesized using wet impregnation method. The synthesis state, surface morphology, chemical properties, etc. of this material were measured, and the adsorption, degradation and cyclic experiments of target contaminants were also conducted to evaluate the application value of MAC and its treatment effect in real water bodies. Through simple and feasible steps, MAC with surface-loaded magnetic iron oxides was synthesized. It had a specific surface area of 457.5 m^(2)/g and a pore size dominated by mesopores(2~50 nm) and micropores(<2 nm), exhibited superparamagnetic properties. It had a saturation magnetization of 3 596 A/m, suggesting that it could be magnetically separated from the medium. The adsorption of 4-chlorophenol by MAC followed a two-stage process. The first stage was a fast adsorption stage, which achieved an adsorption capacity at 84% in 30 min. The second stage was a slow adsorption stage, the adsorption material gradually reached the adsorption equilibrium within 120 min. The adsorption process could be fit by both Langmuir and Freundlich models. The prepared adsorbent could still remove 82% of 4-chlorophenol after five reaction cycles. Experiments on contaminants in river polluted water presented that MAC material could effectively reduce CODand ammonia nitrogen after adding HO. Thus, the adsorption and removal of organic pollutants could be achieved by using MAC.

关 键 词：吸附 磁性材料 催化 有机物 降解 

分 类 号：X703[环境科学与工程—环境工程]