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| 改性茶叶渣生物炭对水中Cr（Ⅵ）的吸附性能研究 |
| Study on Adsorption Performance of Modified Tea Residue Biochar on Cr（Ⅵ） in Water |
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| DOI： |
| 中文关键词: 六价铬 纳米零价铁 吸附机理 茶叶渣 生物炭 水质 |
| 英文关键词: Cr（Ⅵ） nZVI Adsorption mechanism Tea residue Biochar Water quality |
| 基金项目:国家自然科学基金资助项目（42072201）；安徽省科技创新攻坚计划基金资助项目（202423110050008）；安徽省高校协同创新基金资助项目（GXXT-2021-017） |
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| 中文摘要: |
| 通过高温热解茶叶渣和FeSO4·7H2O混合物，制备出负载纳米零价铁（nZVI）的改性生物炭（TBC@nZVI），对其进行表征，并通过试验考察其对水中Cr（Ⅵ）的等温吸附、动力学特征，分析pH值、吸附剂投加量和铁碳质量比等因素对Cr（Ⅵ）吸附性能的影响。结果表明：铁碳质量比为2〖DK（〗∶〖DK）〗1制备得到的TBC@nZVI在pH值为2、吸附剂投加量为1g/L时，吸附效果最佳，最大吸附量为10132 mg/g，该吸附过程符合拟二级动力学模型、颗粒内扩散模型和Langmuir吸附等温模型，且吸附过程自发吸热。 |
| 英文摘要: |
| The modified biochar（TBC@nZVI） loaded with nanoscale zero valent iron（nZVI） was prepared by high temperature pyrolysis of tea residue and FeSO4·7H2O mixture， and characterized accordingly. The isothermal adsorption and kinetic characteristics of Cr（Ⅵ） in water were investigated through experiments， and the effects of pH value， adsorbent dosage and iron carbon ratio on Cr（Ⅵ） adsorption performance were analyzed. The results showed that the TBC@nZVI prepared with an iron carbon mass ratio of 2〖DK（〗∶〖DK）〗1 achieved optimal adsorption efficiency at pH value of 2 and an adsorbent dosage of 1 g/L， with a maximum adsorption capacity of 10132 mg/g. The adsorption process conformed to pseudo second order kinetic model， intraparticle diffusion model and Langmuir adsorption isotherm model， and was spontaneous and endothermic. |
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