引用本文:
由耀辉, 林雷, 陈凯淋, 郑小刚, 廖学品, 孙绪兵. TEMPO氧化废纸纤维对甲基紫的吸附性能[J]. 环境化学, 2017, 36(8): 1868-1876
YOU Yaohui, LIN Lei, CHEN Kailin, ZHENG Xiaogang, LIAO Xuepin, SUN Xubing. Adsorption properties of TEMPO oxidized waste paper fiber for methyl violet[J]. Environmental Chemistry, 2017, 36(8): 1868-1876

TEMPO氧化废纸纤维对甲基紫的吸附性能
由耀辉1, 林雷1, 陈凯淋1, 郑小刚1, 廖学品1,2, 孙绪兵1
1. 内江师范学院果类废弃物资源化四川省高等学校重点实验室, 内江, 641100;
2. 四川大学制革清洁技术国家工程实验室, 成都, 610065
摘要:
以废纸纤维(WF)为原料,2,2,6,6-四甲基哌啶-1-氧基(TEMPO)为氧化剂,制备不同氧化度的废纸纤维(OWF-1,OWF-2,OWF-3),用于吸附甲基紫染料.采用红外光谱、X射线衍射、扫描电镜对吸附剂的结构和形貌进行表征.结果表明,氧化反应在WF上引入了羧基,降低了结晶度,但并没有改变纤维状形貌.吸附实验结果表明,OWF氧化度越高吸附容量越大,pH对吸附容量影响显著,温度对吸附容量影响较小,表明OWF与甲基紫之间的存在电荷吸附.在30℃,pH=9,甲基紫初始质量浓度为50 mg·L-1,OWF-3质量浓度为1000 mg·L-1的条件下,吸附容量达到48.1 mg·g-1.对吸附过程的等温线及动力学进行研究,发现Freundlich吸附等温线和拟二级动力学模型能够更好描述吸附过程.此外,OWF-3具有良好的分离和再生性能.
关键词:    废纸纤维    TEMPO    甲基紫    吸附    再生   
Adsorption properties of TEMPO oxidized waste paper fiber for methyl violet
YOU Yaohui1, LIN Lei1, CHEN Kailin1, ZHENG Xiaogang1, LIAO Xuepin1,2, SUN Xubing1
1. Key Laboratory of Fruit Waste Treatment and Resource Recycling of the Sichuan Provincial Higher Learning Institutes, Neijiang Normal University, Neijiang, 641100, China;
2. National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu, 610065, China
Abstract:
Oxidized waste paper fibers with different degrees of oxidation (OWF-1, OWF-2, OWF-3) were prepared from the oxidation of waste paper fibers (WF) using 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) as an oxidant, and were used to adsorb methyl violet. The structure and morphology of the adsorbents were characterized by infrared spectroscopy (IR), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The results indicated that carboxyl groups were introduced into WF by oxidation reaction, which resulted in a decrease of the crystal degree, but did not change the fibrous morphology. With the increased oxidation degree of OWF, the adsorption capacity was enhanced. The effect of temperature on adsorption capacity was insignificant, but the effect of pH on adsorption capacity was remarkable, which implied that the mechanism of adsorption was based on electrostatic association. The adsorption capacity was 48.1 mg·g-1 at 30℃, pH 9, an initial methyl violet mass concentration of 50 mg·L-1, and OWF-3 mass concentration of 1000 mg·L-1. The adsorption isotherm followed the Freundlich model, and the kinetic data can be well described by the pseudo second-order kinetic model. Furthermore, it was found that the as-prepared OWF-3 had good separation and regeneration abilities.
Key words:    waste paper fiber    TEMPO    methyl violet    adsorption    regeneration   
收稿日期: 2016-11-23
基金项目: 国家自然科学基金(21506103),四川省科技厅重大科技支撑计划(2015GZ0170)和四川省教育厅重大培育项目(15CZ0026)资助.
孙绪兵,Tel:18783270258,E-mail:37591174@qq.com
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