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Efficient removal and transformation of Cr(VI) from alkaline wastewater to form a ferrochromium spinel multiphase via a modified ferrite process.
Lan, Yingying; Sun, Yiwei; Chu, Shasha; Yang, Bo; Zhang, Lijuan; Xiao, Lin; Li, Jinlin; Yuan, Xiaochao; Yan, Xin; Galvita, Vladimir V; Su, Xintai.
Afiliación
  • Lan Y; School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, PR China.
  • Sun Y; School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, PR China.
  • Chu S; School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, PR China.
  • Yang B; School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, PR China.
  • Zhang L; School of Environment, South China Normal University, University Town, Guangzhou, Guangdong, 510006, PR China.
  • Xiao L; Sichuan Yinhe Chemical Co., Ltd, Mianyang, Sichuan, 621000, PR China.
  • Li J; School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, PR China.
  • Yuan X; Sichuan Yinhe Chemical Co., Ltd, Mianyang, Sichuan, 621000, PR China.
  • Yan X; Sichuan Yinhe Chemical Co., Ltd, Mianyang, Sichuan, 621000, PR China.
  • Galvita VV; Laboratory for Chemical Technology, Ghent University, Technologiepark 125, 9052, Ghent, Belgium. Electronic address: Vladimir.Galvita@UGent.be.
  • Su X; School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, PR China. Electronic address: suxintai@scut.edu.cn.
Chemosphere ; 351: 141185, 2024 Mar.
Article en En | MEDLINE | ID: mdl-38215831
ABSTRACT
Chromium-containing wastewater causes serious environmental pollution due to the harmfulness of Cr(VI). The ferrite process is typically used to treat chromium-containing wastewater and recycle the valuable chromium metal. However, the current ferrite process is unable to fully transform Cr(VI) into chromium ferrite under mild reaction conditions. This paper proposes a novel ferrite process to treat chromium-containing wastewater and recover valuable chromium metal. The process combines FeSO4 reduction and hydrothermal treatment to remove Cr(VI) and form chromium ferrite composites. The Cr(VI) concentration in the wastewater was reduced from 1040 mg L-1 to 0.035 mg L-1, and the Cr(VI) leaching toxicity of the precipitate was 0.21 mg L-1 under optimal hydrothermal conditions. The precipitate consisted of micron-sized ferrochromium spinel multiphase with polyhedral structure. The mechanism of Cr(VI) removal involved three

steps:

1) partial oxidation of FeSO4 to Fe(III) hydroxide and oxy-hydroxide; 2) reduction of Cr(VI) by FeSO4 to Cr(III) and Fe(III) precipitates; 3) transformation and growth of the precipitates into chromium ferrite composites. This process meets the release standards of industrial wastewater and hazardous waste and can improve the efficiency of the ferrite process for toxic heavy metal removal.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Aleaciones de Cromo / Óxido de Aluminio / Aguas Residuales / Óxido de Magnesio Tipo de estudio: Guideline Idioma: En Revista: Chemosphere Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Aleaciones de Cromo / Óxido de Aluminio / Aguas Residuales / Óxido de Magnesio Tipo de estudio: Guideline Idioma: En Revista: Chemosphere Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido