Simultaneous Removal of Cu(II) and Cr(VI) Ions from Wastewater by Photoreduction with TiO2–ZrO2. (February 2020)

• Record Type: Journal Article
• Authors: Yan, Runhua; Luo, Dingyuan; Fu, Chengyu; Tian, Wen; Wu, Pan; Wang, Ying; Zhang, Hao; Jiang, Wei
• Is Part Of: Journal of water process engineering. Volume 33(2020)
• Publication Date: 2020-02
• Subjects: Photoreduction -- Solid solution -- Cu(II) -- Cr(VI) -- Simultaneous removal; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2019.101052
• Languages: English
• ISSNs: 2214-7144

Abstract

Graphical abstract: Highlights: Cr(VI) and Cu(II) concentration of wastewater reached the discharge standards within 17 min One-step treatment of Cu(II) and Cr(VI) in a hybrid solution under UV irradiation Cr(VI) photoreduction occurred preferentially before Cu(II) reduction Accelerated photoreduction of Cu(II) caused by the Schottky effect of photodeposited Cu Abstract: A solid solution photocatalyst, TiO2 –ZrO2, was used to simultaneously remove coexisting Cu(II) and Cr(VI) from wastewater by photoreduction. Results showed that the two heavy metal ions can be effectively removed from the hybrid wastewater simultaneously by Ti0.95Zr0.05 under UV irradiation with HCOOH–HCOONa as the sacrificial agent. The obtained water reached the discharge standards, with a Cr(VI) concentration of 0.5 mg/L at 5 min and a Cu(II) concentration of 0.11 mg/L at 17 min. The solid solution exhibited excellent stability after four cycles, with Cr(VI) and Cu(II) removal rates of 100% and 91%, respectively. However, reduction of Cr(VI) was observed first, and Cu(II) was subsequently reduced at an accelerated rate. This behavior was ascribed to the stronger oxidization of Cr(VI) compared to Cu(II) and the Schottky effect of photodeposited Cu.