摘要
In this study, a novel Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La (denoted as SnO 2 -Sb@Ni-La(H)) was successfully prepared by hydrothermal method . The fabricated SnO 2 -Sb@Ni-La(H) electrode exhibited the superior electrocatalytic properties: high oxygen evolution potential (2.34 V vs. SCE), low charge transfer resistance (73.4 Ω cm −2 ), and highest degradation efficiency of benzoic acid (BA) ( k BA = 0.112 min −1 ), compared with other electrodes. The degradation rate of BA on the SnO 2 -Sb@Ni-La(H) was 3.6-fold, 4.7-fold, and 7-fold higher than that of SnO 2 -Sb@Ni-La(T), Ti/TiO 2 Blue, and Ti/SnO 2 -Sb, respectively. The study showed that •OH was the main radical contributing to pollutants degradation and the first-order degradation rate of organic pollutants in electrochemical oxidation (EO) process depends on their reactivity towards •OH ( k •OH,OP ), except for the case of methyl orange (MeO). Among the proposed combination methods, the combination of adsorption and electrochemical oxidation (rGO + EO process) exhibited excellent performance: the first-order degradation rate of P-nitrosodimethylaniline ( k RNO ) in (rGO + EO) process increased by 1.42-fold, compared with the EO process alone. This can be explained by the synergy effect from adsorption of RNO on rGO and the degradation of RNO during the EO process. The hydrothermal deposition combined with thermal decomposition can significantly improve the physical and electrochemical oxidation properties of the Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La electrode: k RNO increased by 3.5-fold, compared with that of 1-time deposition by hydrothermal deposition. In addition, the effect of some operating parameters was investigated, including pH, current density, cathode size and distance of electrodes. This study provided a new method to prepare high-performance Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La electrode and proposed some methods to improve the removal efficiency of the pollutants.
危险品化学品经营许可证（带存储）