An innovative approach to oxidative removal of hydrogen sulfide using the solution of peroxo heteropolyacid

Abstract

A new method of removing H2S using the solution of peroxo phosphomolybdic acid was developed. The results showed that the solution of peroxo phosphomolybdic acid had perfect capacity for H2S removal. A H2S removal efficiency of 100% for 10 h could be achieved by using two-stage absorption with an absorbent concentration of 0.02 mol L–1. The effect of temperature, concentration of peroxo phosphomolybdic acid and H2S on H2S removal was explored. According to the results, a high absorbent concentration, low H2S concentration and slightly excessive H2O2 are beneficial to H2S removal under relatively low temperature. The absorbent showed a perfect regeneration performance, and could be reactivated simply by adding a few drops of 30% H2O2 solution. The X-ray photoelectron spectra showed that the H2S was oxidized to SO42– finally.