Arsenic Oxidation and Removal from Water via Core–Shell MnO2@La(OH)3 Nanocomposite Adsorption

Wang, Yulong; Guo, Chen; Zhang, Lin; Lu, Xihao; Liu, Yanhong; Li, Xuhui; Wang, Yangyang; Wang, Shaofeng

doi:10.3390/ijerph191710649

Open AccessArticle

Arsenic Oxidation and Removal from Water via Core–Shell MnO₂@La(OH)₃ Nanocomposite Adsorption

by

Yulong Wang

^1,2,†,

Chen Guo

^1,2,†,

Lin Zhang

^1,2

,

Xihao Lu

^1,2,

Yanhong Liu

^3,*,

Xuhui Li

^1,2

,

Yangyang Wang

^1,2 and

Shaofeng Wang

^4,*

¹

National Demonstration Center for Environmental and Planning, College of Geography and Environmental Science, Henan University, Kaifeng 475004, China

²

Henan Engineering Research Center for Control and Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China

³

College of Software, Henan University, Kaifeng 475004, China

⁴

Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China

^*

Authors to whom correspondence should be addressed.

^†

These authors contribute equally to this work and should be regarded as co-first authors.

Int. J. Environ. Res. Public Health 2022, 19(17), 10649; https://doi.org/10.3390/ijerph191710649

Submission received: 1 July 2022 / Revised: 19 August 2022 / Accepted: 22 August 2022 / Published: 26 August 2022

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Abstract

Arsenic (As(III)), more toxic and with less affinity than arsenate (As(V)), is hard to remove from the aqueous phase due to the lack of efficient adsorbents. In this study, a core–shell structured MnO₂@La(OH)₃ nanocomposite was synthesized via a facile two-step precipitation method. Its removal performance and mechanisms for As(V) and As(III) were investigated through batch adsorption experiments and a series of analysis methods including the transformation kinetics of arsenic species in As(III) removal, FTIR, XRD and XPS. Solution pH could significantly influence the removal efficiencies of arsenic. The adsorption process of As(V) occurred rapidly in the first 5 h and then gradually decreased, whereas the As(III) removal rate was relatively slower. The maximum adsorption capacities of As(V) and As(III) were up to 138.9 and 139.9 mg/g at pH 4.0, respectively. For As(V) removal, the inner-sphere complexes of lanthanum arsenate were formed through the ligand exchange reactions and coprecipitation. The oxidation of As(III) to the less toxic As(V) by δ-MnO₂ and subsequently the synergistic adsorption process by the lanthanum hydroxide on the MnO₂@La(OH)₃ nanocomposite to form lanthanum arsenate were the dominant mechanisms of As(III) removal. XPS analysis indicated that approximately 20.6% of Mn in the nanocomposite after As(III) removal were Mn(II). Furthermore, a small amount of Mn(II) and La(III) were released into solution during the process of As(III) removal. These results confirm its efficient performance in the arsenic-containing water treatment, such as As(III)-contaminated groundwater used for irrigation and As(V)-contaminated industrial wastewater.

Keywords: MnO₂@La(OH)₃ nanocomposite; arsenate; arsenite; removal; mechanism; oxidation

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MDPI and ACS Style

Wang, Y.; Guo, C.; Zhang, L.; Lu, X.; Liu, Y.; Li, X.; Wang, Y.; Wang, S. Arsenic Oxidation and Removal from Water via Core–Shell MnO₂@La(OH)₃ Nanocomposite Adsorption. Int. J. Environ. Res. Public Health 2022, 19, 10649. https://doi.org/10.3390/ijerph191710649

AMA Style

Wang Y, Guo C, Zhang L, Lu X, Liu Y, Li X, Wang Y, Wang S. Arsenic Oxidation and Removal from Water via Core–Shell MnO₂@La(OH)₃ Nanocomposite Adsorption. International Journal of Environmental Research and Public Health. 2022; 19(17):10649. https://doi.org/10.3390/ijerph191710649

Chicago/Turabian Style

Wang, Yulong, Chen Guo, Lin Zhang, Xihao Lu, Yanhong Liu, Xuhui Li, Yangyang Wang, and Shaofeng Wang. 2022. "Arsenic Oxidation and Removal from Water via Core–Shell MnO₂@La(OH)₃ Nanocomposite Adsorption" International Journal of Environmental Research and Public Health 19, no. 17: 10649. https://doi.org/10.3390/ijerph191710649

APA Style

Wang, Y., Guo, C., Zhang, L., Lu, X., Liu, Y., Li, X., Wang, Y., & Wang, S. (2022). Arsenic Oxidation and Removal from Water via Core–Shell MnO₂@La(OH)₃ Nanocomposite Adsorption. International Journal of Environmental Research and Public Health, 19(17), 10649. https://doi.org/10.3390/ijerph191710649

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Arsenic Oxidation and Removal from Water via Core–Shell MnO₂@La(OH)₃ Nanocomposite Adsorption

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