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| Adsorption characteristics and mechanisms of tris（2-chloroisopropyl）phosphate from corn straw biochar |
| Received:April 11, 2022 |
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| KeyWord:biochar;tris（2-chloroisopropyl）phosphate;corn straw;adsorption |
| Author Name | Affiliation | E-mail | | LI Yujie | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | | | LUO Qing | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | luoqingyt@126.com | | WANG Congcong | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | | | WU Zhongping | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | | | ZHANG Jieliu | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | |
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| Abstract: |
| In this study, we investigated the mechanisms through which tris（2-chloroisopropyl）phosphate（TCIPP）is absorbed on biochar and the effects of pH, temperature, and adsorbent addition on this adsorption effect. We prepared biochar from corn straw through oxygenlimited pyrolysis at 500 ℃, and we analyzed the changes in the surface functional groups and the elemental composition of biochar before and after adsorption of TCIPP by elemental analysis, FTIR, and XPS. The results showed that the adsorption of TCIPP on biochar was more consistent with the quasi-secondary kinetics（R2=0.964 1）and Temkin（R2=0.994 8）models. The adsorption of TCIPP on biochar was mainly achieved through chemisorption and intermolecular forces. The adsorption process included liquid-film diffusion, surface adsorption, and internal particle diffusion. The pH and adsorbent addition had a stronger effect, whereas the temperature had a weaker effect on the adsorption process. The results of FTIR and XPS before and after the adsorption of TCIPP on biochar showed that the functional groups on the surface of biochar, such as -OH, C-O, and C-H on the aromatic ring, participated in the adsorption process via π-π interactions and coordination bonds. Our findings show that the adsorption of TCIPP onto biochar is influenced by several processes and factors. Therefore, the influence of physical and chemical properties and external environmental factors should be considered when using biochar to remove target pollutants. |
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