摘要
以壳聚糖为黏合剂,采用包覆法制备了一种新型除砷吸附剂--颗粒状铁铜锰复合氧化物(GFCM). GFCM吸附剂为不完全球状,直径0.7~1.0 mm,可以有效地将As(Ⅲ)氧化成As(V),并对形成的As(V)具有良好的吸附效果. GFCM对As(Ⅲ)的最大吸附容量(pH 7.0)为56.5 mg·g^-1,显著优于目前已报道的多数颗粒状除砷吸附剂.溶液pH在5.0~9.0范围内, GFCM对As(Ⅲ)均有较好的吸附效果,离子强度则对砷吸附效果影响较小.共存阴离子对As(Ⅲ)吸附具有抑制作用,影响的大小顺序为:PO4^3-> SiO3^2-> CO3^2-> Cl^-> SO4^2-.吸附As(Ⅲ)后的GFCM可用NaOH溶液进行有效脱附再生,可重复使用.在As(Ⅲ)的去除过程中,吸附剂中锰氧化物的主要作用是氧化As(Ⅲ),铁氧化物与铜氧化物的主要作用是吸附As(Ⅲ)与氧化形成的As(V),且铜氧化物有助于增强GFCM的砷吸附性能.
A novel sorbent of granular Fe-Cu-Mn trimetal oxide(GFCM) was fabricated by coating method, with chitosan as adhesive. The GFCM presents an incomplete spheric shape with a diameter of 0.7~1.0 mm. It can effectively oxidize As(Ⅲ) to As(V) and efficiently adsorb the new formed As(V). Its maximal sorption capacity on As(Ⅲ) is up to 56.5 mg·g^-1 at pH 7.0, which is superior to most of reported granular sorbents. The GFCB also shows excellent As(Ⅲ) sorption efficiency over a wide range of pH from 5.0 to 9.0, and is less affected by ionic strength. The coexisting anions would restrain the As(Ⅲ) sorption efficiency by the following order: PO4^3-> SiO3^2-> CO3^2-> Cl^-> SO4^2-. The arsenic-loaded sorbent could be effectively regenerated by using NaOH solution and reused again. During the process of As(Ⅲ) removal, Mn oxide in sorbent is mainly responsible for As(Ⅲ) oxidation, while both Fe and Cu oxides are dominant for adsorbing As(Ⅲ) and formed As(V). Moreover, Cu oxide contributes to enhance As(Ⅲ) sorption performance of the GFCM.
作者
王建燕
张传巧
陈静
张高生
WANG Jianyan;ZHANG Chuanqiao;CHEN Jing;ZHANG Gaosheng(Key Laboratory of Coastal Environmental Processes and Ecological Remediation,Research Center for Coastal Environment Engineering and Technology of Shandong Province,Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai 264003;University of Chinese Academy of Sciences,Beijing 100049;School of Environmental and Municipal Engineering,Xi′an University of Architecture and Technology,Xi′an 710055;Key Laboratory of Water Quality and Conservation of the Pearl River Delta,Ministry of Education,Guangzhou University,Guangzhou 510006)
出处
《环境科学学报》
CAS
CSCD
北大核心
2019年第8期2575-2585,共11页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.51478457)
