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Systematic study on the reduction efficiency of ascorbic acid and thiourea on selenate and selenite at high and trace concentrations.
Zhang, Gongli; Gomez, Mario Alberto; Yao, Shuhua; Ma, Xu; Li, Shifen; Cao, Xuan; Zang, Shuyan; Jia, Yongfeng.
Afiliación
  • Zhang G; Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China.
  • Gomez MA; Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China. mario.gomez@syuct.edu.cn.
  • Yao S; Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China.
  • Ma X; Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China.
  • Li S; Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China.
  • Cao X; Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China.
  • Zang S; Institute of Environment Protection, Shenyang University of Chemical Technology, Shenyang, 110142, China.
  • Jia Y; Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China. yongfeng.jia@iae.ac.cn.
Environ Sci Pollut Res Int ; 26(10): 10159-10173, 2019 Apr.
Article en En | MEDLINE | ID: mdl-30746628
Selenate (Se(VI)) and selenite (Se(IV)) are common soluble wastewater pollutants in natural and anthropogenic systems. We evaluated the reduction efficiency and removal of low (0.02 and 2 mg/L) and high (20 and 200 mg/L) Se(IV)(aq) and Se(VI)(aq) concentrations to elemental (Se0) via the use of ascorbic acid (AA), thiourea (TH), and a 50-50% mixture. The reduction efficiency of AA with Se(IV)(aq) to nano- and micro-crystalline Se0 was ≥ 95%, but ≤ 5% of Se(VI)(aq) was reduced to Se(IV)(aq) with no Se0. Thiourea was able to reduce ≤ 75% of Se(IV)(aq) to bulk Se0 at lower concentrations but was more effective (≥ 90%) at higher concentrations. Reduction of Se(VI)(aq)→Se (IV)(aq) with TH was ≤ 75% at trace concentrations which steadily declined as the concentrations increased, and the products formed were elemental sulfur (S0) and SnSe8-n phases. The reduction efficiency of Se(IV)(aq) to bulk Se0 upon the addition of AA+TH was ≤ 81% at low concentrations and ≥ 90% at higher concentrations. An inverse relation to what was observed with Se(IV)(aq) was found upon the addition of AA+TH with Se(VI)(aq). At low Se(VI)(aq) concentrations, AA+TH was able to reduce more effectively (≤ 61%) Se(VI)(aq)→Se(IV)(aq)→Se0, while at higher concentrations, it was ineffective (≤ 11%) and Se0, S0, and SnSe8-n formed. This work helps to guide the removal, reduction effectiveness, and products formed from AA, TH, and a 50-50% mixture on Se(IV)(aq) and Se(VI)(aq) to Se0 under acidic conditions and environmentally relevant concentrations possibly found in acidic natural waters, hydrometallurgical chloride processing operations, and acid mine drainage/acid rock drainage tailings. Graphical Abstract ᅟ.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ácido Ascórbico / Tiourea / Ácido Selenioso / Ácido Selénico / Modelos Químicos Idioma: En Revista: Environ Sci Pollut Res Int Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2019 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ácido Ascórbico / Tiourea / Ácido Selenioso / Ácido Selénico / Modelos Químicos Idioma: En Revista: Environ Sci Pollut Res Int Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2019 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania