壳聚糖/磁性生物碳对重金属Cu(Ⅱ)的吸附性能

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Adsorption properties of chitosan/magnetic biochar for Cu(Ⅱ) removal from solution

XIAO Fangfang^1,,
ZHANG Yingying¹,
CHENG Jianhua^1,2,,
YANG Cao¹,
HU Yongyou¹
1.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
2.South China Institutes Collaborative Innovation, South China University of Technology, Dongguan 523808, China

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摘要:以丝瓜络为原料制备壳聚糖/磁性生物炭(CMLB)，并研究了改性前后的生物炭对重金属Cu(Ⅱ)的吸附性能。结果表明，改性后的生物炭包含γ-Fe2O3纳米颗粒，颗粒尺寸均匀，大小一致。CMLB对Cu(Ⅱ)的吸附量为54.68 mg·g-1，高于原始生物炭(LB)、磁性生物炭(MLB)的吸附量，且能够达到壳聚糖吸附量的86%。整个吸附过程在18 h达到平衡，在pH=5.8±0.1有较好的吸附效果。吸附反应动力学可采用准二级动力学方程拟合，吸附等温线符合Freundlich模型。CMLB吸附Cu(Ⅱ)的机制下包括离子交换、物理吸附和共沉淀。CMLB材料在处理废水后，利用磁铁可将材料从水中分离。CMLB可作为一种吸附剂有效去除水中的重金属，应用前景广阔。
关键词: 生物炭/
壳聚糖/
Cu(Ⅱ)/
吸附

Abstract:In this study, loofah was used to prepare magnetic biochar combined with chitosan (CMLB), and the Cu(Ⅱ) adsorption properties were compared for biochar before and after modification. The results showed that the modified biochar was coated with a layer of γ-Fe2O3 nanoparticles with uniform size. CMLB had higher Cu(Ⅱ) adsorption capacity of 54.68 mg·g-1 than pristine biochar and magnetic biochar，it could account for 86% chitosan adsorption capacity. The adsorption equilibrium time was 18 h and a good adsorption result occurred at pH of 5.8±0.1. The kinetics and thermodynamics of adsorption process could be well fitted with a pseudo-second-order kinetic model and a Freundlich one, respectively. The mechanisms of Cu(Ⅱ) removal included ion exchange，physical adsorption and surface coprecipitation. The used CMLB after heavy metal adsorption can be separated from solution by using an external magnetic field. These results showed that CMLB could effectively absorb heavy metal from water and have a good prospect of application in water and wastewater treatment.
Key words:biochar/
chitosan/
Cu(Ⅱ)/
adsorption.

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刊出日期:2019-06-03

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