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| Influence and mechanism of silicate minerals on the characteristic and stability of straw hydrochar |
| Received:May 08, 2025 |
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| KeyWord:straw waste;hydrothermal carbonization;mineral modification;stability |
| Author Name | Affiliation | E-mail | | WANG Keji | School of Energy and Environment, Anhui University of Technology, Ma ' anshan 243000, China
Graduate School of Anhui University of Technology, Ma'anshan 243000, China | | | ZHANG Qin | School of Energy and Environment, Anhui University of Technology, Ma ' anshan 243000, China
Graduate School of Anhui University of Technology, Ma'anshan 243000, China | | | WANG Yulai | School of Energy and Environment, Anhui University of Technology, Ma ' anshan 243000, China | | | WU Jing | School of Energy and Environment, Anhui University of Technology, Ma ' anshan 243000, China | hnwujing@126.com | | XIE Wenping | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | |
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| Abstract: |
| In order to improve the performance of straw hydrochar, two kinds of silicate mineral(kaolinite and montmorillonite)with different dosage have been applied to modify wheat straw through hydrothermal carbonization in this study, to harvest the kaolinite modified hydrochar(5%KHC and 15%KHC) and montmorillonite modified hydrochar(5%MHC and 15%MHC). As shown by the results of hydrochars' characteristic analysis, compared with the no-mineral treatment(HC), the yields of 15% KHC and 15% MHC were increased by 7.32% and 6.15% respectively, on which distinct layered structures were found, among which the specific surface area of 5% MHC has significantly increased by 2.59 times. Meanwhile, the electrical conductivity, cation exchange capacity, and pH of the KHC and MHC were higher than that of HC. Specifically, the pH of KHC and MHC were increased by 0.38-0.69 and 0.55-0.74. However, the contents of C, H, and N in KHC and MHC were lower than that in HC, while the O content was increased significantly by 1.69%-18.97% and 14.14%-30.02% in KHC and MHC compared with HC. Moreover, under the oxidization of H2O2, compared with HC, the carbon loss rates of 15%KHC and 15%MHC were increased by 35.35% and 36.01%, respectively. Nevertheless, the results of pyrolysis showed that the thermal stabilities of 15%KHC and 15%MHC were increased by 8% and 6%, respectively. Those stability changes of hydrochars might be related to their organic matters. The analysis showed that the dissolved organic carbon of KHC was generally lower than that of HC, which was opposite in MHC, along with the proportion of fulvic acid in dissolved organic matter was distinctly increased in both of them. This might be attributed to the influence of the interactions between the minerals and hydrochar on carbonization processing. In summary, mineral modification could effectively enhance its yield, specific surface area, and thermal stability, and promote its chemical activity. |
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