Superior arsenate adsorption and comprehensive investigation of adsorption mechanism on novel Mn-doped La2O2CO3 composites

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境纳米材料实验室

	Superior arsenate adsorption and comprehensive investigation of adsorption mechanism on novel Mn-doped La2O2CO3 composites
	Su, Jing; Lyu, Tao; Yi, Hao; Bi, Lei; Pan, Gang
刊名	CHEMICAL ENGINEERING JOURNAL
	2020-07-01
卷号	391 页码:1-11
关键词	Atoms doping Adsorption energy Lanthanum compounds Arsenate removal
ISSN号	1385-8947
英文摘要	A major challenge for effective decontamination of arsenate from aqueous solution is the development of adsorbent possessing enormous high-active sites with strong affinity to realize both high adsorption capacity and reduction of arsenate down to permissive levels. Here we demonstrate that this challenge may be overcome by doping Mn atoms into La2O2CO3 materials. The synthesized material (5.26%-MnL) achieved an arsenate capture ability superior to most other currently-reported adsorbents, with the maximum adsorption capacity of 555.6 mg/g. Additionally, this novel adsorbent could dramatically reduce the concentration of arsenate from 3775 mu g/L to less than 4 mu g/L, well below the acceptable value for drinking water (10 mu g/L). The adsorption capacity of 5.26%-MnL was demonstrated to be > 300 mg/g over a wide pH range from 4 to 9 and the efficiency was maintained > 85% even after three cycles of adsorption/desorption. Through a series of characterizations, both surface complexation and ion exchange were proved to contribute to arsenate removal at low molar ratios of As(V)/5.26%-MnL while forming LaAsO4 precipitation played a greater role at higher As(V)/5.26%-MnL ratios. Density Functional Theory (DFT) calculations suggested that Mn atoms acted as active species by not only increasing lattice defects and adsorption sites, but also by activating La3+ in La2O2CO3, which lowered the adsorption energy and facilitated arsenate removal. Due to the high affinity and superior adsorption capacity towards arsenate, Mn-doped La2O2CO3 has been demonstrated to be a promising prospect for the remediation of arsenate-polluted water.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44888]
专题	生态环境研究中心_环境纳米材料实验室
推荐引用方式 GB/T 7714	Su, Jing,Lyu, Tao,Yi, Hao,et al. Superior arsenate adsorption and comprehensive investigation of adsorption mechanism on novel Mn-doped La2O2CO3 composites[J]. CHEMICAL ENGINEERING JOURNAL,2020,391:1-11.
APA	Su, Jing,Lyu, Tao,Yi, Hao,Bi, Lei,&Pan, Gang.(2020).Superior arsenate adsorption and comprehensive investigation of adsorption mechanism on novel Mn-doped La2O2CO3 composites.CHEMICAL ENGINEERING JOURNAL,391,1-11.
MLA	Su, Jing,et al."Superior arsenate adsorption and comprehensive investigation of adsorption mechanism on novel Mn-doped La2O2CO3 composites".CHEMICAL ENGINEERING JOURNAL 391(2020):1-11.