Systematic study on the reduction efficiency of ascorbic acid and thiourea on selenate and selenite at high and trace concentrations

Systematic study on the reduction efficiency of ascorbic acid and thiourea on selenate and selenite at high and trace concentrations

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Published in:Environmental science and pollution research. - Springer Berlin Heidelberg, 1994. - 26(2019), 10 vom: 12. Feb., Seite 10159-10173
Main Author: Zhang, Gongli (Author)
Other Authors: Gomez, Mario Alberto (Author) Yao, Shuhua (Author) Ma, Xu (Author) Li, Shifen (Author) Cao, Xuan (Author) Zang, Shuyan (Author) Jia, Yongfeng (Author)
Format: electronic Article
Language:English
Published: 2019
ISSN:1614-7499
External Sources:lizenzpflichtig
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520 |a Abstract 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 ($ Se^{0} $) 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 $ Se^{0} $ was ≥ 95%, but ≤ 5% of Se(VI)(aq) was reduced to Se(IV)(aq) with no $ Se^{0} $. Thiourea was able to reduce ≤ 75% of Se(IV)(aq) to bulk $ Se^{0} $ 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 ($ S^{0} $) and $ S_{n} $$ Se_{8−n} $ phases. The reduction efficiency of Se(IV)(aq) to bulk $ Se^{0} $ upon the addition of AA+TH was ≤ 81% at low concentrations and ≥ 90% at higher concentrations. An inverse relation to what was observed with Se(IV)(aq) was found upon the addition of AA+TH with Se(VI)(aq). At low Se(VI)(aq) concentrations, AA+TH was able to reduce more effectively (≤ 61%) Se(VI)(aq)→Se(IV)(aq)→$ Se^{0} $, while at higher concentrations, it was ineffective (≤ 11%) and $ Se^{0} $, $ S^{0} $, and $ S_{n} $$ Se_{8−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 $ Se^{0} $ 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 Abstractᅟ 
650 4 |a Ascorbic acid 
650 4 |a Thiourea 
650 4 |a Selenium 
650 4 |a Chloride 
650 4 |a Reduction 
650 4 |a Acidic ambient conditions 
700 1 |a Gomez, Mario Alberto  |0 (orcid)0000-0001-9247-2723  |4 aut 
700 1 |a Yao, Shuhua  |4 aut 
700 1 |a Ma, Xu  |4 aut 
700 1 |a Li, Shifen  |4 aut 
700 1 |a Cao, Xuan  |4 aut 
700 1 |a Zang, Shuyan  |4 aut 
700 1 |a Jia, Yongfeng  |4 aut 
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773 1 8 |g volume:26  |g year:2019  |g number:10  |g day:12  |g month:02  |g pages:10159-10173 
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