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The influencing mechanism of O_(2),H_(2)O,and CO_(2)on the H_(2)S removal of food waste digestate-derived biochar with abundant minerals

查看全文 作　　者：Dandan [1,2]Huang;Ning [3]Wang;Xinyue [2]Bai;Yuke [2]Chen;Qiyong [2]Xu 高影响力作者 机构地区：[1]Shenzhen Campus of Sun Yat-Sen University,No.66,Gongchang Road,Guangming District,Shenzhen 518107,China.;[2]Shenzhen Engineering Laboratory for Eco-Efficient Recycled Materials,School of Environment and Energy,Peking University Shenzhen Graduate School,University Town,Xili,Nanshan District,Shenzhen 518055,China.;[3]Ministry of Education Key Laboratory for Ecology of Tropical Islands,College of Life and Sciences,Hainan Normal University,Haikou 571158,China高影响力机构 出　　处：《Biochar》索引2022年第4卷第1期,共18页高影响力期刊 基　　金：the National Key R&D Program of China(2018YFC1902903);National Natural Science Foundation of China(22176005);the Fundamental Research Funds for the Central Universities,Sun Yat-sen University(Project no.22qntd2701). 摘　　要：Hydrogen sulfide(H_(2)S)removal has been a significant concern in various industries.In this study,food waste diges-tate-derived biochar(DFW-BC),a by-product of food waste treatment with abundant minerals,was assessed for removing H_(2)S from different simulated biogas containing oxygen(O_(2))and carbon dioxide(CO_(2))and under differ-ent moisture(H_(2)O)contents(0%and 20%)of biochar.The influencing mechanisms of the gas conditions combined with the moisture contents were also investigated.The results showed an H_(2)S removal of 1.75 mg g^(−1)for dry bio-char under pure H_(2)S,4.29 mg g^(−1)for dry biochar under H_(2)S+O_(2),5.29 mg g^(−1)for humid biochar under H_(2)S,and 12.50 mg g^(−1)for humid biochar under H_(2)S+O_(2).For dry DFW-BC,the high Fe content was responsible for the O_(2)enhancement.In contrast,O_(2)+H_(2)O activated the catalytic H_(2)S oxidation of the less reactive minerals(mainly Ca).The inhibition of CO_(2)on H_(2)S adsorption was not obvious for dry DFW-BC;the specific pore structure may have provided a buffer against the physisorption competition of CO_(2).However,when H_(2)O was present on DFW-BC,the changes in critical biochar properties and sulfur speciation as opposed to that without H_(2)O implied an evident occurrence of CO_(2)chemisorption.This CO_(2)chemisorption partially hindered O_(2)+H_(2)O enhancement,decreasing the H_(2)S removal capacity from 12.50 to 8.88 mg g^(−1).The negative effect was ascribed to mineral carbonation of CO_(2),neutralizing the alkaline surface and immobilizing metal oxides,which thus reduced the acceleration in H_(2)S dissociation and activa-tion in catalytic H_(2)S oxidation by O_(2)+H_(2)O. 关 键 词：Hydrogen sulfide Carbon DIGESTATE Adsorption Desulfuration DEODORIZATION
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