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甘氨酸改性TiO2材料的合成及其对染料的吸附性能

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张林, 冯江涛, 王宁, 徐浩, 延卫. 甘氨酸改性TiO2材料的合成及其对染料的吸附性能[J]. 环境化学, 2018, 37(12): 2621-2629. doi: 10.7524/j.issn.0254-6108.2018012905
引用本文: 张林, 冯江涛, 王宁, 徐浩, 延卫. 甘氨酸改性TiO2材料的合成及其对染料的吸附性能[J]. 环境化学, 2018, 37(12): 2621-2629. doi: 10.7524/j.issn.0254-6108.2018012905
shu
ZHANG Lin, FENG Jiangtao, WANG Ning, XU Hao, YAN Wei. Preparation of glycine functionalized TiO2 adsorbent and its adsorption performance for organic dyes[J]. Environmental Chemistry, 2018, 37(12): 2621-2629. doi: 10.7524/j.issn.0254-6108.2018012905
Citation: ZHANG Lin, FENG Jiangtao, WANG Ning, XU Hao, YAN Wei. Preparation of glycine functionalized TiO2 adsorbent and its adsorption performance for organic dyes[J]. Environmental Chemistry, 2018, 37(12): 2621-2629. doi: 10.7524/j.issn.0254-6108.2018012905
shu

甘氨酸改性TiO2材料的合成及其对染料的吸附性能

  • 1.

    西安交通大学, 能源与动力工程学院环境工程系, 西安, 710049

  • 基金项目:

    国家自然科学基金（21307098，21507104）和中央高校基本科研业务费资助.

Preparation of glycine functionalized TiO2 adsorbent and its adsorption performance for organic dyes

  • 1.

    School of energy and power engineering, Xi'an Jiaotong University, Xi'an, 710049, China

  • Fund Project: Supported by the National Natural Science Foundation of China(21307098,21507104) and the Fundamental Research Funds for the Central Universities.

  • 摘要: 本文以钛酸异丙酯为钛源，以甘氨酸（gly）为改性材料，通过水解法在比较温和的条件下合成了二氧化钛（TiO2-gly）吸附剂，同时以亚甲基蓝（MB）和酸性红G（ARG）两种染料为处理对象，考察了合成的TiO2的吸附性能，并将之与P25材料进行对比.结果表明，经过甘氨酸改性的TiO2吸附剂的比表面积大幅提升到354.2 m2·g-1；改性TiO2对亚甲基蓝（100 mg·L-1）和酸性红G（100 mg·L-1）两种染料的吸附能力得到较大提高，最大吸附量分别为49.25 mg·g-1和43.98 mg·g-1，远高于P25对二者的吸附容量（分别为28.24 mg·g-1和16.40 mg·g-1）；P25的吸附主要受物理吸附作用控制，而改性TiO2吸附剂20 min即可达到吸附平衡，并展现出准二级动力学和Langmuir吸附等温线特性，这表明吸附剂与染料分子之间主要为化学吸附.另外，通过吸附影响因素实验发现通过延长吸附时间、控制pH都能提高该吸附剂的吸附性能，而改性TiO2-gly吸附剂经过5次再生循环实验后仍展现出较好的吸附性能.
    Abstract: In this work, a TiO2 adsorbent (TiO2-gly) was prepared by the hydrolysis of isopropyl titanate in glycine solution under moderate condition. Then cationic dye methylene blue (MB) and anionic dye Acid Red G (ARG) were used as the targeted contaminants to investigate the adsorption performance of TiO2-gly in comparison with P25. It was found that the specific surface area of the as-prepared TiO2-gly was also increased by glycine modification (354.2 m2·g-1 from 48.5 m2·g-1). The glycine functionalized TiO2 adsorbent also showed greater adsorption capacities (MB 49.25 mg·g-1 and ARG 43.98 mg·g-1) than P25 (MB 28.24 mg·g-1 and ARG16.40 mg·g-1). The data of adsorption isotherm and adsorption kinetics experiments indicute that the adsorption process of the dyes onto TiO2-gly mainly depended on the chemisorption while physisorption was the dominant process onto P25. In addition, the adsorption capacity of TiO2-gly was improved by prolonging the adsorption time and optimizing the pH value of the adsorption system. The modified TiO2 also showed good adsorption regeneration performance.
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  • 收稿日期:  2018-01-29
  • 刊出日期:  2018-12-15
张林, 冯江涛, 王宁, 徐浩, 延卫. 甘氨酸改性TiO2材料的合成及其对染料的吸附性能[J]. 环境化学, 2018, 37(12): 2621-2629. doi: 10.7524/j.issn.0254-6108.2018012905
引用本文: 张林, 冯江涛, 王宁, 徐浩, 延卫. 甘氨酸改性TiO2材料的合成及其对染料的吸附性能[J]. 环境化学, 2018, 37(12): 2621-2629. doi: 10.7524/j.issn.0254-6108.2018012905
shu
ZHANG Lin, FENG Jiangtao, WANG Ning, XU Hao, YAN Wei. Preparation of glycine functionalized TiO2 adsorbent and its adsorption performance for organic dyes[J]. Environmental Chemistry, 2018, 37(12): 2621-2629. doi: 10.7524/j.issn.0254-6108.2018012905
Citation: ZHANG Lin, FENG Jiangtao, WANG Ning, XU Hao, YAN Wei. Preparation of glycine functionalized TiO2 adsorbent and its adsorption performance for organic dyes[J]. Environmental Chemistry, 2018, 37(12): 2621-2629. doi: 10.7524/j.issn.0254-6108.2018012905
shu

甘氨酸改性TiO2材料的合成及其对染料的吸附性能

  • 1. 西安交通大学, 能源与动力工程学院环境工程系, 西安, 710049
  • 收稿日期:  2018-01-29
基金项目:

国家自然科学基金（21307098，21507104）和中央高校基本科研业务费资助.

摘要: 本文以钛酸异丙酯为钛源，以甘氨酸（gly）为改性材料，通过水解法在比较温和的条件下合成了二氧化钛（TiO2-gly）吸附剂，同时以亚甲基蓝（MB）和酸性红G（ARG）两种染料为处理对象，考察了合成的TiO2的吸附性能，并将之与P25材料进行对比.结果表明，经过甘氨酸改性的TiO2吸附剂的比表面积大幅提升到354.2 m2·g-1；改性TiO2对亚甲基蓝（100 mg·L-1）和酸性红G（100 mg·L-1）两种染料的吸附能力得到较大提高，最大吸附量分别为49.25 mg·g-1和43.98 mg·g-1，远高于P25对二者的吸附容量（分别为28.24 mg·g-1和16.40 mg·g-1）；P25的吸附主要受物理吸附作用控制，而改性TiO2吸附剂20 min即可达到吸附平衡，并展现出准二级动力学和Langmuir吸附等温线特性，这表明吸附剂与染料分子之间主要为化学吸附.另外，通过吸附影响因素实验发现通过延长吸附时间、控制pH都能提高该吸附剂的吸附性能，而改性TiO2-gly吸附剂经过5次再生循环实验后仍展现出较好的吸附性能.

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