复合型吸附剂黑曲霉菌丝体-壳聚糖的制备及对Cu2+吸附的作用机制

doi:10.3969/j.issn.0253-2417.2018.04.018

林产化学与工业 ›› 2018, Vol. 38 ›› Issue (4): 117-123.doi: 10.3969/j.issn.0253-2417.2018.04.018

复合型吸附剂黑曲霉菌丝体-壳聚糖的制备及对Cu²⁺吸附的作用机制

夏远涛, 杨美红, 孙会杰, 高雅廷, 周桂

广西民族大学海洋与生物技术学院;广西高校微生物与植物资源利用重点实验室, 广西南宁 530006

收稿日期:2018-01-05 出版日期:2018-08-25 发布日期:2018-08-10
通讯作者: 周桂,教授,博士,硕士生导师,主要从事生物化学研究;E-mail:13077739608@163.com。 E-mail:13077739608@163.com
作者简介:夏远涛(1992-),男,湖北麻城人,硕士生,研究方向为生物化学
基金资助:
广西自然科学基金资助项目（2014GXNSFAA118047，2014GXNSFAA118076）；2017年广西民族大学研究生教育创新计划项目（gxun-chxzs2017118）

Preparation of Aspergillus niger Mycelium-chitosan Biosorbent and Its Cu²⁺ Adsorption Mechanism

XIA Yuantao, YANG Meihong, SUN Huijie, GAO Yating, ZHOU Gui

School of Marine Sciences and Biotechnology, Guangxi University for Nationalities;Guangxi Colleges and Universities Key Laboratory of Utilization of Microbial and Botanical Resources, Nanning 530006, China

Received:2018-01-05 Online:2018-08-25 Published:2018-08-10

摘要/Abstract

摘要： 以废弃黑曲霉菌丝体、壳聚糖为原料，用环氧氯丙烷进行交联，三聚磷酸钠进行固化，制备成黑曲霉菌丝体-壳聚糖，以此作为吸附剂对Cu²⁺进行吸附研究，考察了吸附时间、pH值、温度、Cu²⁺的初始质量浓度以及复合型吸附剂的投加量对吸附效率的影响，探讨了吸附的动力学和热力学规律。结果显示：提高吸附温度、吸附时间以及pH值均能使吸附率升高；在黑曲霉菌丝体-壳聚糖复合型吸附剂0.4 g，吸附时间180 min、pH值6、吸附温度为50℃、Cu²⁺质量浓度为20 mg/L的条件下，对Cu²⁺的吸附率达到99.42%。动力学数据分析表明吸附剂对Cu²⁺的吸附过程符合准二级动力学模型，以化学吸附为主，粒子内扩散不是唯一的吸附速率控制步骤；吸附过程符合Freundlich等温线模型，说明吸附Cu²⁺为非均相体系的表面吸附；ΔG^ɵ<0，ΔH^ɵ和ΔS^ɵ分别为6.104 2 kJ/mol和45.258 1 J/（mol·K），即该吸附是一个自发进行的吸热过程。

关键词: 黑曲霉, 菌丝体, 壳聚糖, Cu²⁺, 吸附过程

Abstract: The waste Aspergillus niger mycelium and chitosan were cross-linked by epichlorohydrin and then solidified sodium tripolyphosphate to prepare the Aspergillus niger mycelium-chitosan biosorbent for Cu²⁺. The effects of adsorption time, pH value, temperature, the initial concentration of Cu²⁺ and the amount of biosorbent on the adsorption efficiency were investigated. Kinetics, intragranular diffusion model, adsorption isotherm equation, thermodynamic model were used to fit the experimental data. The results showed that the adsorption rate increased by increasing the adsorption temperature, adsorption time and pH value. The adsorption rate of Cu²⁺ reached 99.42% at the adsorption conditions of 0.4 g Aspergillus niger mycelium-chitosan biosorbent, adsorption time 180 min, adsorption temperature 50℃, mass concentration of Cu²⁺ 20 mg/L. The adsorption process conformed to the Freundlich isotherm model. The adsorbed Gibbs free energy became negative, and ΔH^ɵ were ΔS^ɵ are 6.104 2 kJ/mol and 45.258 1 J/(mol·K), respectively, ie the adsorption was a spontaneous endothermic process. Kinetic data analysis showed that the adsorption of Cu²⁺ by Aspergillus niger mycelia-chitosan biosorbents fitted quasi-second-order kinetic model.

Key words: Aspergillus niger, mycelium, chitosan, Cu²⁺, adsorption process

中图分类号:

TQ35

夏远涛, 杨美红, 孙会杰, 高雅廷, 周桂. 复合型吸附剂黑曲霉菌丝体-壳聚糖的制备及对Cu²⁺吸附的作用机制[J]. 林产化学与工业, 2018, 38(4): 117-123.

XIA Yuantao, YANG Meihong, SUN Huijie, GAO Yating, ZHOU Gui. Preparation of Aspergillus niger Mycelium-chitosan Biosorbent and Its Cu²⁺ Adsorption Mechanism[J]. Chemistry and Industry of Forest Products, 2018, 38(4): 117-123.

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复合型吸附剂黑曲霉菌丝体-壳聚糖的制备及对Cu²⁺吸附的作用机制

Preparation of Aspergillus niger Mycelium-chitosan Biosorbent and Its Cu²⁺ Adsorption Mechanism

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