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Removal of Cr(VI) from wastewater by artificial zeolite spheres loaded with nano Fe–Al bimetallic oxide in constructed wetland

Kong, Fanlong, Zhang, Yu, Wang, Hongsheng, Tang, Jianguo, Li, Yue, Wang, Sen·2020·Chemosphere
DOI 10.1016/j.chemosphere.2020.127224
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Abstract

In order to solve the problems of poor adsorption capacity and low stability in treating heavy metal wastewater with traditional constructed wetland (CW) fillers, a new type of filler, artificial zeolite spheres loaded with nano Fe-Al bimetallic oxide (hereinafter referred to as composite zeolite spheres), was prepared for Cr(VI) removal from wastewater. The results indicated that nano Fe-Al bimetallic oxide was an effective material for Cr(VI) removal with the maximal removal efficiency of 84.9% at initial Cr(VI) concentration of 20 mg/L (pH = 3). The micro-reactor experiment further verified that composite zeolite spheres had better removal performance on Cr(VI) than traditional filler. Fourier-transform infrared (FT-IR), X-ray diffractometry (XRD) and X-Ray photoemission spectroscopy (XPS) results demonstrated that -OH groups reduced Cr(VI) to Cr(III), and then the Cr(III) was removed by forming Cr x Fe 1-x (OH) 3 precipitation with Fe(III) or formed Cr(OH) 3 precipitation with Al-OH through the ion exchange. This study provided an effective approach for treating Cr(VI) wastewater by using a new composite zeolite in constructed wetlands (CWs).

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Metadata

Authors
Kong, F., Zhang, Y., Wang, H., Tang, J., Li, Y., & Wang, S.
Venue
Chemosphere
Publisher
Elsevier BV
Published
2020-10
Volume
257
Pages
127224
ISSN
0045-6535
DOI
10.1016/j.chemosphere.2020.127224
Cited by
76
References
0
Language
en
Licence
Funders
  • Department of Science and Technology of Shandong Province
  • Natural Science Foundation of Shandong Province

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