{"title":"CO2环境下共热解制备纳米氧化铁金属生物炭及吸附Cr(VI)的研究","authors":"Jeong-Yun Jang, Sun Joon Kim","doi":"10.32390/ksmer.2022.59.2.127","DOIUrl":null,"url":null,"abstract":"This study explored the effects of blending nano iron (III) oxides (NIO) with coffee grounds (CG) in a pyrolytic process under a CO 2 environment on the generation of syngas (H 2 and CO) and biochar properties regarding the removal of Cr(VI) from aqueous solutions. CG and NIO were physically mixed; CG was mass maintained at 1 g while NIO was added. Based on the mass ratio, the resulting solution was named NICG1(NIO/CG ratio=1:1). Compared with the generation amounts of syngas (0.37 mole% H 2 & 0.28 mole% CO) at 650°C from single pyrolysis of CG, co-pyrolysis with NIO-based additives resulted in increased production of syngas, with the measured concentrations of H 2 and CO reaching 0.99 mole% and 0.86 mole% at the same temperature, respectively. During the pH effect experiments, NICG1 demonstrated the highest removal efficiency under acidic conditions with pH = 2. Adsorption kinetic experiments demonstrated that the pseudo-second-order rate model was suitable for assessing the removal of Cr(VI) by NICG1. Furthermore, the removal of Cr(VI) using NICG1 fitted well with the Freundlich isothernm adsorption model (R 2 = 0.9807). In conclusion, co-pyrolysis of blending nano iron(III) oxide and coffee grounds can be considered an efficient resource for simultaneously producing syngas (H 2 and CO) as a fuel (energy resource) and metal-biochar as an adsorbent.","PeriodicalId":17454,"journal":{"name":"Journal of the Korean Society of Mineral and Energy Resources Engineers","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A Study on Preparation of Nano Iron Oxides-Based Metal Biochar Using Co-Pyrolysis in a CO2 Environment and Adsorption of Cr(VI)\",\"authors\":\"Jeong-Yun Jang, Sun Joon Kim\",\"doi\":\"10.32390/ksmer.2022.59.2.127\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This study explored the effects of blending nano iron (III) oxides (NIO) with coffee grounds (CG) in a pyrolytic process under a CO 2 environment on the generation of syngas (H 2 and CO) and biochar properties regarding the removal of Cr(VI) from aqueous solutions. CG and NIO were physically mixed; CG was mass maintained at 1 g while NIO was added. Based on the mass ratio, the resulting solution was named NICG1(NIO/CG ratio=1:1). Compared with the generation amounts of syngas (0.37 mole% H 2 & 0.28 mole% CO) at 650°C from single pyrolysis of CG, co-pyrolysis with NIO-based additives resulted in increased production of syngas, with the measured concentrations of H 2 and CO reaching 0.99 mole% and 0.86 mole% at the same temperature, respectively. During the pH effect experiments, NICG1 demonstrated the highest removal efficiency under acidic conditions with pH = 2. Adsorption kinetic experiments demonstrated that the pseudo-second-order rate model was suitable for assessing the removal of Cr(VI) by NICG1. Furthermore, the removal of Cr(VI) using NICG1 fitted well with the Freundlich isothernm adsorption model (R 2 = 0.9807). In conclusion, co-pyrolysis of blending nano iron(III) oxide and coffee grounds can be considered an efficient resource for simultaneously producing syngas (H 2 and CO) as a fuel (energy resource) and metal-biochar as an adsorbent.\",\"PeriodicalId\":17454,\"journal\":{\"name\":\"Journal of the Korean Society of Mineral and Energy Resources Engineers\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2022-04-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of the Korean Society of Mineral and Energy Resources Engineers\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.32390/ksmer.2022.59.2.127\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Korean Society of Mineral and Energy Resources Engineers","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.32390/ksmer.2022.59.2.127","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
A Study on Preparation of Nano Iron Oxides-Based Metal Biochar Using Co-Pyrolysis in a CO2 Environment and Adsorption of Cr(VI)
This study explored the effects of blending nano iron (III) oxides (NIO) with coffee grounds (CG) in a pyrolytic process under a CO 2 environment on the generation of syngas (H 2 and CO) and biochar properties regarding the removal of Cr(VI) from aqueous solutions. CG and NIO were physically mixed; CG was mass maintained at 1 g while NIO was added. Based on the mass ratio, the resulting solution was named NICG1(NIO/CG ratio=1:1). Compared with the generation amounts of syngas (0.37 mole% H 2 & 0.28 mole% CO) at 650°C from single pyrolysis of CG, co-pyrolysis with NIO-based additives resulted in increased production of syngas, with the measured concentrations of H 2 and CO reaching 0.99 mole% and 0.86 mole% at the same temperature, respectively. During the pH effect experiments, NICG1 demonstrated the highest removal efficiency under acidic conditions with pH = 2. Adsorption kinetic experiments demonstrated that the pseudo-second-order rate model was suitable for assessing the removal of Cr(VI) by NICG1. Furthermore, the removal of Cr(VI) using NICG1 fitted well with the Freundlich isothernm adsorption model (R 2 = 0.9807). In conclusion, co-pyrolysis of blending nano iron(III) oxide and coffee grounds can be considered an efficient resource for simultaneously producing syngas (H 2 and CO) as a fuel (energy resource) and metal-biochar as an adsorbent.