Dimensionally stable Ti/SnO2-RuO2 composite electrode based highly efficient electrocatalytic degradation of industrial gallic acid effluent

Ying Zhang; Ping He; Lingpu Jia; Tinghong Zhang; Huanhuan Liu; Shuai Wang; Caixia Li; Faqin Dong; Shiping Zhou

doi:10.1016/j.chemosphere.2019.02.195

Dimensionally stable Ti/SnO₂-RuO₂ composite electrode based highly efficient electrocatalytic degradation of industrial gallic acid effluent

Chemosphere. 2019 Jun:224:707-715. doi: 10.1016/j.chemosphere.2019.02.195. Epub 2019 Mar 3.

Authors

Ying Zhang¹, Ping He², Lingpu Jia¹, Tinghong Zhang¹, Huanhuan Liu¹, Shuai Wang¹, Caixia Li¹, Faqin Dong³, Shiping Zhou⁴

Affiliations

¹ State Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, PR China.
² State Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, PR China. Electronic address: heping@swust.edu.cn.
³ Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, PR China. Electronic address: fqdong@swust.edu.cn.
⁴ Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, PR China; National Engineering Research Center for Municipal Wastewater Treatment and Reuse, Mianyang, 621000, PR China.

PMID: 30851522
DOI: 10.1016/j.chemosphere.2019.02.195

Abstract

In this work, dimensionally stable Ti/SnO₂-RuO₂ electrode is successfully prepared using thermal decomposition method for the electrocatalytic degradation of high-concentration industrial gallic acid (GA) effluent in detail. The surface morphology, crystal structure and element analysis of as-prepared Ti/SnO₂-RuO₂ electrode are characterized by scanning electron microscopy, X-ray diffraction and X-ray fluorescence spectrometer, respectively. In addition, cyclic voltammetry, polarization curve and accelerated life tests are exploited to investigate the electrocatalytic activity and stability of Ti/SnO₂-RuO₂ electrode. Orthogonal experiment shows that, among the factors (current density, temperature and initial pH), current density is pivotal parameter influencing the degradation efficiency of industrial GA effluent. COD removal and degradation efficiencies of GA effluent reach up to 76.9% and 80.1% after 6 h, respectively, at the optimal conditions (current density of 10 mA cm^-2, pH 6 and 35 °C). The degradation of GA effluent follows pseudo-first-order reaction kinetics. This work provides an in-depth theoretical support and application of electrocatalytic technology to the treatment of high-concentration industrial GA effluent.

Keywords: Electrocatalytic degradation; Energy consumption; Industrial gallic acid effluent; Pseudo-first-order reaction kinetics; Ti/SnO(2)-RuO(2) electrode.

MeSH terms

Biological Oxygen Demand Analysis / methods*
Electrodes
Gallic Acid / chemistry*
Ruthenium Compounds / chemistry*
Tin Compounds / chemistry*
Titanium / chemistry*
Water Pollutants, Chemical / chemistry*
Water Purification / methods*
X-Ray Diffraction

Substances

Ruthenium Compounds
Tin Compounds
Water Pollutants, Chemical
Gallic Acid
Titanium
stannic oxide