The interfacial electric field enhanced piezo-catalytic performance of Bi2S3/Ni/CN composites for peroxymonosulfate activation advanced oxidation processes (AOP) systems

Abstract

The interfacial electric field of Bi2S3/Ni/CN composites has been found to enhance the piezo-catalytic performance in peroxymonosulfate activation for advanced oxidation processes (AOP) systems. This novel research field aims to strengthen AOP systems for pollutant control and degradation through the utilization of the piezo-catalysis. In this particular study, a hammer coral-like Bi2S3/Ni/CN composite with interfacial electric field was synthesized by incorporating bismuth sulfide into the Ni/CN matrix. The efficient separation of piezoelectric carriers and charge transfer between nickel and bismuth in the resulting Bi2S3/Ni/CN composite facilitate a synergistic effect in the activation of peroxymonosulfate (PMS). It has been observed that, when subjected to ultrasound, this composite can achieve a degradation rate exceeding 90% within a minute towards Rh B as a model dye. Notably, the degradation process is primarily driven by piezoelectric hole and mono-linear oxygen non-free radicals. Additionally, the interfacial electric field facilitates valence electron transfer and ultimately enhancing reaction efficiency. Experimental results further demonstrate that the removal efficiency of organic pollutants can surpass 98% within a pH range of 1–9 over a duration of 3 min, demonstrating wide pH response range and high catalytic activities.