期刊
CHEMICAL ENGINEERING JOURNAL
卷 395, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124153
关键词
Sb recovery; Hydrated electrons; Cathodic reduction; Sulfite; UV light
资金
- National Natural Science Foundation of China [51578532]
Recovery of antimony (Sb) from wastewater is desired. Deposition of Sb(III) to metal Sb can occur via cathodic reduction, which is limited for Sb(V) reduction. Herein, a UV/sulfite-assisted electrodeposition (UV/sulfite/E) system was developed for the recovery of Sb(V) as metal Sb. The hydrated electron (e(aq)(-)) generated from UV/ sulfite process reduced Sb(V) to Sb(III), which was simultaneously reduced to metal Sb via cathodic reduction. Results indicated that as high as 95% of Sb(V) with a concentration of 50 mg/L can be deposited onto the cathode as metal Sb within 6 h. The reduction of Sb(V) to Sb(III) by eaq-was confirmed by laser flash photolysis tests. More importantly, the OH-generated at cathode increased the pH of the UV/sulfite/E system and enabled the eaq-generation even at pH=4, which was beneficial for Sb(V) reduction at a wide pH range. The optimal conditions for Sb(V) recovery were found to be at a sulfite concentration of 10mM and an applied potential of -1.2 V (vs. SCE). The recovery of Sb(V) from practical Sb-containing wastewater was finally carried out and the results indicated that more than 60% of Sb was recovered as metal Sb.
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