Study On The Heterogeneous Reaction Of H₂S On The Surface Of Oxide Particles

The troposphere contains abundant H₂S gas,which is an important gaseous pollutant in the atmosphere.It has a wide range of sources and a very low olfactory threshold.At present,the research on H₂S mainly remains in gas desulfurization and industrial production research,neglecting the gas-solid reaction in the atmosphere.Studies have shown that H₂S can generate heterogeneous ions on the surface of particles to generate secondary ions,further affecting the atmosphere.Therefore,this paper studies the conversion mechanism of H₂S,increases the meteorological conditions,and analyzes the influence of meteorological factors on the H₂S conversion mechanism.Nine kinds of oxides such as Fe₂O₃,?-Al₂O₃,MnO₂,ZnO,CuO,TiO₂,SiO₂,MgO and CaO were chosen as the heterogeneous reaction media for H₂S.The surface product of the H₂S reaction on the particulates was monitored.On this basis,selected?-Al₂O₃,ZnO two characteristics of particulate matter for further study,increase the temperature,light and humidity three meteorological conditions,in-depth study of meteorological factors on gas-solid heterogeneous reaction.The main conclusions are as follows:?1?Under the ozone conditions monitored by DRIFTS infrared spectroscopy,H₂S can generate SO₄^2-and SO₃^2-on the surface of particulates.Among them,sulfates doubly coordinated with CuO,Fe₂O₃,and TiO₂ particles,sulfate monodentate coordination with CaO,MnO₂,and MgO particles generate free sulfate on the surface of?-Al₂O₃,SiO₂,and ZnO particles.The specific surface area uptake factor size is:ZnO>?-Al₂O₃>MnO₂>MgO>CuO>Fe₂O₃>TiO₂>CaO>SiO₂.?2?Under temperature conditions,the amount of SO₄^2-and SO₃^2-generated by H2S reacted on the surface of?-Al₂O₃ particles for 3 hours and gradually decreased with the increase of temperature,and the amount of sulfate generated after3 hours of reaction on the surface of ZnO particles.The production is:30?>25?>35?>30?>3?>10?>15?,the production of sulfite is:15?>10?>20?>25?>3?>30?>35?.Under light conditions,both SO₄^2-and SO₃^2-of H₂S on the surface of?-Al₂O₃ and ZnO particles increased with time.Under the condition of humidity,the coordination of the surface of the two oxide particles was in the free state and no coordination occurred.Only free SO₄^2-and SO₃^2-were generated.?3?The ICP was used to determine the dust-falling elements in Chengdu and Mianyang.Among them,Al,Fe,and Ca were the main elements,accounting for74.85%and 67.78%of the total measured elements.The main soluble ion is SO₄^2-.Under the ozone condition,the reaction of H₂S produces SO₄^2-and SO₃^2-,which proves that the conversion of H₂S is one of the sources of sulfate.