| 刘成昊，林春岭，钟来元，李镇城，奉艺婕，赖飞鸿，朱颖佳.甘蔗渣生物炭对水体铬吸附反应研究[J].广东农业科学,2021,48(8):90-97 |
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甘蔗渣生物炭对水体铬吸附反应研究 |
| Study on Adsorption of Chromium by Bagasse Biochar |
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| DOI：10.16768/j.issn.1004-874X.2021.08.011 |
| 中文关键词: 甘蔗渣生物炭 Cr（Ⅲ）和 Cr（Ⅵ） 反应条件 吸附性能 吸附动力学 |
| 英文关键词: bagasse biochar Cr（Ⅲ）and Cr（Ⅵ） reaction condition adsorption performance absorption kinetics |
| 基金项目:国家自然科学基金（41371316）；广东海洋大学大学生创新创业训练计划项目（CXXL2020030） |
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| 中文摘要: |
| 【目的】探究甘蔗渣生物炭对铬（Cr）的最佳吸附条件和吸附机理。【方法】在 N2 保护和
350、450、550 ℃ 3 种温度条件下制备甘蔗渣生物炭，通过扫描电镜（SEM）比较炭化前后甘蔗渣外观的变化，
通过批量处理试验研究制备温度、用量、Cr 初始质量浓度、吸附时间等因素对甘蔗渣生物炭吸附 Cr（Ⅲ）和
Cr（Ⅵ）的影响。【结果】甘蔗渣生物炭孔隙度随制备温度的升高而增大。制备温度越低，对 Cr（Ⅵ）去除
效率越高，当 Cr（Ⅵ）质量浓度和炭用量分别为 50 mg/L 和 15 g/L 时，反应 7 d 后，350 ℃制备的生物炭对 Cr
（Ⅵ）的最大吸附量为 5.703 mg/g，去除率可达 92.39%；制备温度越高，对 Cr（Ⅲ）去除效率越高，当 Cr（Ⅲ）
质量浓度和炭用量分别为 75 mg/L 和 10 g/L 时，反应 7 d 后， 550 ℃制备的生物炭对 Cr（Ⅲ）的最大吸附量为 9.158
mg/g，去除率达 97.06%。甘蔗渣生物炭对 Cr 吸附等温线可用 Langmuir 模型拟合，Cr（Ⅵ）和 Cr（Ⅲ）吸附
动力学曲线分别符合拟一级和拟二级反应动力学模型。【结论】不同温度下制备的甘蔗渣生物炭对不同价态
Cr 的吸附具有选择性，其中 350 ℃制备的生物炭对 Cr（Ⅵ）的吸附效率最高，而 550 ℃制备的生物炭对 Cr（Ⅲ）
的吸附效率最高。 |
| 英文摘要: |
| 【Objective】The study aimed to explore the optimal conditions for adsorption of Cr by bagasse biochar
and reveal the underlying mechanisms.【Method】Under the preservation of N2, three types of bagasse biochar were
prepared with the temperature precisely controlled at 350, 450 and 550 ℃ , respectively. The changes in morphology of
bagasse before and after carbonization were compared by using scanning electron microscope（SEM）. The effects of
preparation temperature, dosage of biochar, initial concentration of Cr and reaction time on the adsorption of Cr（Ⅲ）
and Cr（Ⅵ）were investigated.【Result】The porosity of bagasse biochar expanded with the increase in preparation
temperature. Bagasse biochar prepared at low temperature exhibited good efficiency for Cr（Ⅵ）removal, when the mass
concentration of Cr（Ⅵ）and carbon dosage were 50 mg/L and 15 g/L, the maximum amount of adsorbed Cr（Ⅵ）by
bagasse biochar prepared at 350 ℃ was 5.703 mg/g after reaction for 7 d, with the removal rate of 92.39%. The bagasse biochar prepared at high temperature showed optimal efficiency for Cr（Ⅲ ）removal rate. When the mass concentration
of Cr（Ⅵ ）and carbon dosage were 75 mg/L and 10 g/L, the maximum amount of adsorbed Cr（Ⅵ ）by bagasse biochar
prepared at 550 ℃ was 9.158 mg/g after reaction for 7 d, with the removal rate of 97.06%. The adsorption isotherm of Cr
obeyed the Langmuir model, and the kinetics curves of Cr（Ⅵ）and Cr（Ⅲ）fitted the pseudo-first-order kinetic model
and pseudo-second-order kinetic model, respectively.【Conclusion】The efficiency of Cr（Ⅲ）and Cr（Ⅵ）removal was
largely dependent on the temperature for biochar preparation. Based on the results above, the biochar prepared at 350 ℃
showed optimal efficiency for Cr（Ⅵ）adsorption, and 550 ℃ for Cr（Ⅲ）adsorption. |
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