gCN-P: a coupled g-C3N4/persulfate system for photocatalytic degradation of organic pollutants under simulated sunlight

Abstract

A coupled g-C 3 N 4 /PDS system, named gCN-P, has been put forward to degrade refractory organic pollutants under simulated sunlight which integrates photocatalysis and PS-AOPs (advanced oxidation of persulfate based on sulfate radicals). The coupled g-C 3 N 4 and PDS showed superior synergistic effect for MO degradation under simulated sunlight. Results showed that almost all MO was removed in the gCN-P system after irradiation for 80 min under simulated sunlight. The degradation rate of gCN-P system was improved by 12.6 and 4.9 times compared to single PDS and g-C 3 N 4 systems, respectively. And only by adding 0.01 g of persulfate into the gCN-P system. The results of quenching experiments and EPR showed that O 2 − , 1 O 2 and h + were main active species for the degradation of MO in the gCN-P system under simulated sunlight. Application of the gCN-P system in tap water samples demonstrated its excellent performance in real-world water environment, and the gCN-P system was employed for removing other new contaminants such as bisphenol A, ciprofloxacin, and paracetamol. The results demonstrated the gCN-P system can effectively remove organic pollutants under sunlight in practices.

Facile Construction of Iron Phthalocyanine/Carbon Nitride Heterojunction toward Visible Light-Assisted Peroxydisulfate Activation for Efficient Tetracycline Degradation

“…Compared to PMS, PDS is cheaper and more stable in water, and thus, it is more popular in industrial applications. 11,12 Various methods such as those using heat, alkali, ultraviolet, transition metals, and ultrasound have been proposed to activate PDS. 13 Among these methods, PDS activation by transition metals has been considered as a promising way because of the low cost, high efficiency, and low energy consumption.…”

“…Recently, sulfate radical (·SO 4 – )-based AOPs have attracted increasing interest due to the high oxidation potential, long half-life time (t 1/2 ), and high stoichiometric reaction efficiency of ·SO 4 – , which is mainly produced by activating persulfate including peroxymonosulfate (PMS) and peroxydisulfate (PDS). Compared to PMS, PDS is cheaper and more stable in water, and thus, it is more popular in industrial applications. , Various methods such as those using heat, alkali, ultraviolet, transition metals, and ultrasound have been proposed to activate PDS . Among these methods, PDS activation by transition metals has been considered as a promising way because of the low cost, high efficiency, and low energy consumption.…”