Immobilization and mechanism of As（Ⅲ） in water by FeMn‒Cl‒LDHs hydrotalcite

doi:10.19965/j.cnki.iwt.2021-0681

Abstract

Abstract:

Arsenic（As） pollution is considered to be one of the most serious environmental problems in the world at present，which exists in many countries to varying degrees. Arsenic is a toxic element that exists in the natural environment mainly in the form of inorganic substances in two valence states，As（Ⅴ） and As（Ⅲ）. Compared with As（Ⅴ），As（Ⅲ） is more harmful.In present work，FeMnbased hydrotalcite（FeMn?Cl?LDHs） was constructed by coprecipitation method to investigate the immobilization and mechanism of As（Ⅲ） in water. The test results showed that the removal rate of As（Ⅲ） by FeMn?Cl?LDHs was about 97% in the range of pH 2?8. The existing ions of SiO₃^2-，PO₄^3-，CO₃^2-had competitive adsorption with As（Ⅲ），while Ca²⁺，Mg²⁺，NO₃^- and SO₄^2- had little effect on the As（Ⅲ） removal. The adsorption process of As（Ⅲ） by FeMn?Cl?LDHs was in accordance with the pseudo second order kinetic model and Langmuir isotherm. The maximum adsorption capacity was 61.86 mg/g at 298 K. The mechanism of As（Ⅲ） removal by FeMn?Cl?LDHs might be redox，ion exchange and complexation. After five adsorption?desorption experiments，the removal rate of As（Ⅲ） in water by FeMn?Cl?LDHs remained above 90%，which indicated that FeMn?Cl?LDHs had good potential for environmental application in the removal and toxicity control of As（Ⅲ） in water.

Key words: FeMn?Cl?LDHs, As（Ⅲ）, adsorption, oxidation

摘要：

砷（As）污染被认为是当前世界最严峻的环境问题之一，许多国家都存在着不同程度的As污染。砷是一种有毒元素，主要以As（Ⅴ）和As（Ⅲ）2种价态的无机物形态存在于自然环境中。相比As（Ⅴ），As（Ⅲ）的危害性更大。通过共沉淀法构建铁锰基水滑石（FeMn?Cl?LDHs），研究了其对水中As（Ⅲ）的固定及其机理。试验结果表明，在pH为2~8范围内，FeMn?Cl?LDHs对As（Ⅲ）的去除率保持在97%左右；共存离子SiO₃^2-、PO₄^3-、CO₃^2-和As（Ⅲ）存在竞争吸附，而Ca²⁺、Mg²⁺、NO₃^-和SO₄^2-对As（Ⅲ）的去除影响较小。FeMn?Cl?LDHs对As（Ⅲ）的去除过程符合拟二级动力学模型和Langmuir模型，在298 K时，FeMn?Cl?LDtHs对As（Ⅲ）的最大吸附量为61.86 mg/g。FeMn?Cl?LDHs对As（Ⅲ）的去除机理可能存在氧化还原作用、离子交换和络合。经过5次吸附?解吸试验，FeMn?Cl?LDHs对水中As（Ⅲ）的去除率仍保持在90%以上。FeMn?Cl?LDHs对水中As（Ⅲ）的去除和毒性控制具有良好的环境应用潜力。

关键词: FeMn?Cl?LDHs, As（Ⅲ）, 吸附, 氧化

CLC Number:

X703

Wenqi WANG,Cong WANG,Xueli JIN,Yu ZHENG,Sailajia WEI. Immobilization and mechanism of As（Ⅲ） in water by FeMn‒Cl‒LDHs hydrotalcite[J]. Industrial Water Treatment, 2022, 42(3): 139-146.

王文琦,王聪,靳学利,郑雨,魏赛拉加. FeMn‒Cl‒LDHs水滑石对水中As（Ⅲ）的固定和机理研究[J]. 工业水处理, 2022, 42(3): 139-146.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0681

https://www.iwt.cn/EN/Y2022/V42/I3/139

Figures/Tables 10

Fig. 1 FeMn?Cl?LDHs SEM images before （a） and after （b） adsorption of As（Ⅲ）

Fig.2 N₂adsorption?desorption isotherm（a），pore size distribution（b），XRD（c）and zeta potential（d）of FeMn?Cl?LDHs

Fig.3 Kinetics of As（Ⅲ） removal by FeMn?Cl?LDHs and variation of As species concentration at different minutes

Table 1 The kinetic fitting parameters

实际

吸附量/ （mg·g^-1）

拟一级动力学模型

拟二级动力学模型

q_e/ （mg·g^-1）

k₁/

min^-1

R²

q_e/ （mg·g^-1）

k₂/

（g·mg^-1·min^-1）

R²

Fig.4 Isothermal adsorption model and release amount of

Table 2 Fitting parameters of adsorption isotherm

温度/K	Langmuir模型			Freundlich模型
温度/K	q_max/ （mg·g^-1）	K_b	R₁²	K_f	n	R₂²
288	57.88	1.539	0.958	33.58	5.001	0.777
298	61.86	2.419	0.946	38.75	5.270	0.762
308	62.72	4.031	0.958	42.51	5.999	0.736

Fig.5 Effects of environmental factors on As（Ⅲ） removal

Fig. 6 FTIR spectra of FeMn?Cl?LDHs before and after As（Ⅲ） removal

Fig.7 The XPS spectrum of FeMn?Cl?LDHs before and after As（Ⅲ） removal

Fig. 8 Adsorption?desorption experiments result

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