Electrodisinfection of bacteria-laden in surface water using modified Ti electrode by antimony-and nickel-doped tin oxide composite

• Published in: Chemosphere (Oxford) 2021-01, Vol.263, p.127761, Article 127761
• Main Authors: Rahmani, Ali Reza, Nematollahi, Davood, Poormohammadi, Ali, Azarian, Ghasem, Zamani, Fahime
• Format: Article
• Language: English
• Subjects: Antimony; Bacteria; Electrochemical disinfection; Electrodes; Nickel; Ni–Sb–SnO2 composite; Oxidation-Reduction; Point of use; Surface water; Tin Compounds; Titanium; Water; Water Pollutants, Chemical; Water Purification
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2020.127761

Providing clean and safe drinking water by point of use (POU) disinfection methods has become a critical issue, especially in crises and epidemics. In this study, antimony-and nickel-doped tin oxide electrode (Ni–Sb–SnO2) was employed as an electrode for electro-catalytic disinfection of surface water. The synthetized electrodes were characterized using scanning electron microscope, linear sweep voltammetry and X-Ray diffraction techniques. The results revealed that the highest electrochemical disinfection efficiency was achieved by the Ni–Sb–SnO2 electrode under weak acidic conditions and its performance decreased with increasing pH towards alkaline environment. Based on the results, total coliform (TC) and fecal coliform (FC) were completely removed at current density of 0.67 mA cm−2. Moreover, the electrochemical disinfection of microorganisms showed that the process efficiency was directly proportional to increasing time and at 0.6 C cm−2 of charge passed, 3-log removal of the both indicators occurred after 15 min. The highest removal efficiency of TC and FC was also achieved at 8 mmol of NaCl concentration at