Synthesis of polyoxometalates (POM)/TiO2/Cu and removal of nitrate nitrogen in water by photocatalysis

Lingsheng Wang; Weizhang Fu; Yuping Zhuge; Jun Wang; Fanfeng Yao; Wanzhen Zhong; Xiaohong Ge

doi:10.1016/j.chemosphere.2021.130298

Synthesis of polyoxometalates (POM)/TiO₂/Cu and removal of nitrate nitrogen in water by photocatalysis

Chemosphere. 2021 Sep:278:130298. doi: 10.1016/j.chemosphere.2021.130298. Epub 2021 Mar 17.

Authors

Lingsheng Wang¹, Weizhang Fu², Yuping Zhuge³, Jun Wang⁴, Fanfeng Yao⁵, Wanzhen Zhong⁶, Xiaohong Ge⁷

Affiliations

¹ College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China. Electronic address: 1195443917@qq.com.
² College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China. Electronic address: sdaufwz@sdau.edu.cn.
³ College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China. Electronic address: zhugeyp@sdau.edu.cn.
⁴ College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China. Electronic address: jwang@sdau.edu.cn.
⁵ College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China. Electronic address: 1393200142@qq.com.
⁶ College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China. Electronic address: 963569065@qq.com.
⁷ College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China. Electronic address: 1903086599@qq.com.

PMID: 34126673
DOI: 10.1016/j.chemosphere.2021.130298

Abstract

Nitrate nitrogen is one of the vital issues needed to be addressed in the water purification process utilizing groundwater as a drinking water source. In this study, a sandwich-type polyoxometalate Na [α-SiW₉O₃₄] has been synthesized and SiW₉/TiO₂/Cu composite has been prepared by sol-gel method. Samples have been characterized by XRD, BET, FTIR, SEM, ED-Mapping, UV-Vis, XPS. The catalytic reduction of nitrate was performed in the presence of SiW₉/TiO₂/Cu composite as photocatalyst. The effects of catalyst loading, initial nitrate concentration, sandwich-type polyoxometalate loading, dissolved O₂, and concentration of formic acid on nitrate removal have been investigated. The results showed that the prepared composite catalyst had better photocatalytic activity than the TiO₂. 76.53% of nitrate removal with 82.09% of N₂ selectivity was obtained under the following conditions: catalyst dosage 0.8 g/L, initial nitrate concentration of 30 mg/L, SiW₉/Cu loading percentage of 10%, 30 mmol/L of formic acid, in presence of N₂, and 6 h reaction time.

Keywords: Nitrate nitrogen; Photocatalysis; Sandwich-type polyoxometalate; TiO(2).

MeSH terms

Catalysis
Nitrates*
Nitrogen
Titanium
Tungsten Compounds
Water
Water Pollutants, Chemical* / analysis

Substances

Nitrates
Tungsten Compounds
Water Pollutants, Chemical
polyoxometalate I
Water
titanium dioxide
Titanium
Nitrogen