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林产化学与工业 ›› 2018, Vol. 38 ›› Issue (6): 81-87.doi: 10.3969/j.issn.0253-2417.2018.06.011

• 研究报告 • 上一篇    下一篇

高锰酸钾改性汉麻秆芯对亚甲基蓝吸附性能的研究

许鹏博, 何晶, 俞娟, 范一民   

  1. 南京林业大学 化学工程学院, 江苏 南京 210037
  • 收稿日期:2018-07-18 出版日期:2018-12-25 发布日期:2018-12-27
  • 通讯作者: 俞娟,讲师,硕士生导师,研究领域为木质纤维素改性纳米纤维材料;E-mail:yujuannjfu@njfu.edu.cn。 E-mail:yujuannjfu@njfu.edu.cn
  • 作者简介:许鹏博(1993-),女,江苏宜兴人,硕士生,主要从事木质纤维素改性研究
  • 基金资助:
    江苏省自然科学基金资助项目(BK20170924);江苏高校优势学科建设工程资助项目(无编号)

Methylene Blue Adsorption onto Hemp Hurd Powder Modified by Potassium Permanganate

XU Pengbo, HE Jing, YU Juan, FAN Yimin   

  1. Colleage of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Received:2018-07-18 Online:2018-12-25 Published:2018-12-27

摘要: 以汉麻秆芯(HP)为原料,通过高锰酸钾对其进行氧化改性制备高锰酸改性汉麻秆芯(K-HP),并研究改性前后汉麻秆芯对亚甲基蓝染料的吸附性能,探讨了溶液初始质量浓度、吸附时间、吸附温度和溶液pH值对其吸附性能的影响。结果表明:经高锰酸钾改性后,汉麻秆芯中引入了新的Mn-O键,部分羟基被氧化成羧基,但汉麻秆芯的颗粒尺寸结构没有变化;汉麻秆芯的吸附量随亚甲基蓝溶液初始质量浓度的增加而升高,但染料去除率随之降低;当吸附温度为25℃,pH值为5,在10 mL亚甲基蓝溶液中添加0.010 0 g吸附剂时,HP的最大吸附量达71 mg/g,吸附平衡时间为30 min,K-HP最大吸附量增加到199 mg/g,吸附平衡时间为60 min;HP和K-HP对亚甲基蓝的吸附性能在25~45℃范围内不受影响,最优pH值为5;等温吸附模型拟合结果表明:HP和K-HP的吸附过程符合Langmuir模型,说明吸附过程为理想的单分子层吸附;动力学吸附模型拟合结果表明:HP和K-HP的吸附过程符合准二级动力学模型,说明吸附速率主要受化学吸附机理控制。

关键词: 汉麻秆芯, 化学改性, 吸附, 亚甲基蓝

Abstract: The potassium permanganate modified hemp hurd powder (K-HP) was firstly prepared by oxidation with potassium permanganate. The adsorption performance of hemp hurd powder on methylene blue dye before and after modification were systematically investigated. The effects of initial concentration, adsorption time, adsorption temperature and pH value on adsorption performance were discussed. Results showed that the successful introduction of Mn-O bond into hemp hurd powder and the oxidization of hydroxyl group to the carboxyl group had no effect on the particle structure of hemp. The adsorption capacity of hemp hurd powder increased with the increment of the initial concentration of dye solution, while the dye removal rates decreased. The maximum saturation adsorption capacity for hemp before and after modification was investigated at 25℃, pH value 5 with 0.010 0 g adsorbents added into 10 mL dye solution. HP had the maximum adsorption capacity of 71 mg/g and the equilibrium adsorption time was 30 min. After modification, the maximum adsorption capacity of K-HP increased to 199 mg/g and the equilibrium adsorption time was 60 min. The adsorption performance of HP and K-HP was not affected by temperature within the range of 25-45℃ and the optimal adsorption pH value was 5. The adsorption simulation and fitting results of HP and K-HP conformed to Langmuir isothermal adsorption model, which indicated that the adsorption process was an ideal monolayer adsorption. The adsorption kinetics of methylene blue could be described by the pseudo second-order reaction model, which indicated that the adsorption rate was controlled by chemisorption.

Key words: hemp hurd powder, chemical modification, absorption, methylene blue

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