He Qiuchen, Zhan Su, Zhou Feng
Key Laboratory of Ship-Machinery Maintenance and Manufacture, Ministry of Transport, Dalian Maritime University, Dalian 116026, PR China.
ACS Omega. 2022 May 7;7(19):16524-16535. doi: 10.1021/acsomega.2c00679. eCollection 2022 May 17.
The Pureballast system, based on photocatalytic technology, can purify ships' ballast water. However, the efficiency of photocatalytic sterilization still needs to be improved due to the shortcomings of the photocatalyst itself and the complex components of seawater. In this work, a tandem reaction of electrocatalytic synthesis and photocatalytic decomposition of hydrogen peroxide (HO) was constructed for the inactivation of marine microorganisms. Using seawater and air as raw materials, electrocatalytic synthesis of HO by commercial carbon black can avoid the risk of large-scale storage and transportation of HO on ships. In addition, boron doping can improve the photocatalytic decomposition performance of HO by g-CN. Experimental results show that constructing the tandem reaction is effective, inactivating 99.7% of marine bacteria within 1 h. The sterilization efficiency is significantly higher than that of the single way of electrocatalysis (52.8%) or photocatalysis (56.9%). Consequently, we analyzed the reasons for boron doping to enhance the efficiency of g-CN decomposition of HO based on experiments and first principles. The results showed that boron doping could significantly enhance not only the transfer kinetics of photogenerated electrons but also the adsorption capacity of HO. This work can provide some reference for the photocatalytic technology study of ballast water treatment.
基于光催化技术的Pureballast系统能够净化船舶压载水。然而，由于光催化剂自身的缺点以及海水成分复杂，光催化杀菌效率仍有待提高。在这项工作中，构建了一种用于杀灭海洋微生物的过氧化氢（HO）电催化合成与光催化分解的串联反应。以海水和空气为原料，通过商业炭黑电催化合成HO可避免HO在船上大规模储存和运输的风险。此外，硼掺杂可提高g-CN对HO的光催化分解性能。实验结果表明，构建串联反应是有效的，1小时内可使99.7%的海洋细菌失活。杀菌效率显著高于电催化（52.8%）或光催化（56.9%）的单一方式。因此，我们基于实验和第一性原理分析了硼掺杂提高g-CN分解HO效率的原因。结果表明，硼掺杂不仅能显著提高光生电子的转移动力学，还能提高HO的吸附能力。这项工作可为压载水处理的光催化技术研究提供一些参考。
