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首页> 外文期刊>RSC Advances >Preparation and characterization of the linked lanthanum carboxymethylcellulose microsphere adsorbent for removal of fluoride from aqueous solutions
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Preparation and characterization of the linked lanthanum carboxymethylcellulose microsphere adsorbent for removal of fluoride from aqueous solutions

机译：链接镧羧甲基纤维素微球吸附剂去除水溶液中的含氟化物的制备及表征

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摘要

Linked carboxymethyl cellulose microspheres loaded with lanthanum(III) (linked-CMC-La) were fabricated with glutaraldehyde, from lanthanum carboxymethyl cellulose microspheres (CMC-La), and used to remove fluoride from aqueous solution. Characterization by SEM, resistance to acid and alkali, TG, pH(pzc) and FT-IR was used to distinguish the superiority of the two adsorbents. The results showed that the linked-CMC-La had a higher decomposition temperature (200 degrees C) than CMC-La (190 degrees C) and a better resistance to acid and alkali compared with CMC-La. Batch adsorption experiments were also performed, varying factors of pH, initial fluoride concentration, and contact time. The results showed that the maximum removal efficiencies (REs) of CMC-La and linked-CMC-La were about 98.85% and 99.31%, respectively, when the fluoride concentration was 40 mg L-1 at pH 4.0. The adsorption process could be described well using the Langmuir isotherm model. The adsorption kinetics data was fitted well using a pseudo-second-order model. The analysis of the adsorption and desorption of the linked-CMC-La and CMC-La revealed that crosslinking had no obvious effect on the removal efficiency or mechanism of the adsorption and desorption of the two absorbents. The surface adsorption occurred between the linked-CMC-La and fluoride due to Lewis acid-base interaction and supplemented with electrostatic attractions.
机译：用戊丙醛（III）（Linked-CMC-La）负载的连接羧甲基纤维素微球，用戊二醛，来自镧羧甲基纤维素微球（CMC-1a），并用于从水溶液中除去氟化物。通过SEM，耐酸和碱，Tg，pH（PZC）和FT-IR的表征用于区分两种吸附剂的优越性。结果表明，与CMC-1a相比，连接-CMC-1a的分解温度（200℃）比CMC-LA（190摄氏度））和对酸和碱的抗性更好。还进行了批量吸附实验，改变pH，初始氟化物浓度和接触时间的不同因素。结果表明，当氟化物浓度为40mg L-1在pH 4.0时，CMC-LA和连接-CMC-1a的最大去除效率（RES）分别为约98.85％和99.31％。可以使用Langmuir等温模型很好地描述吸附过程。使用伪二阶模型，吸附动力学数据很好。连接-CMC-LA和CMC-LA的吸附和解吸的分析表明，交联对两种吸收剂的吸附和解吸的去除效率或机理没有明显影响。由于路易斯酸碱相互作用和静电吸引力，在连接-CMC-LA和氟化物之间发生表面吸附。

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  • 来源
    《RSC Advances》 |2015年第73期|共13页
  • 作者

    Wang Jing; Lin Xiaoyan; Luo Xuegang; Yao Wenhui;

  • 作者单位

    Southwest Univ Sci &

    Technol Dept Mat Sci &

    Engn Mianyang 621010 Sichuan Peoples R China;

    Southwest Univ Sci &

    Technol Dept Mat Sci &

    Engn Mianyang 621010 Sichuan Peoples R China;

    Southwest Univ Sci &

    Technol Dept Mat Sci &

    Engn Mianyang 621010 Sichuan Peoples R China;

    Southwest Univ Sci &

    Technol Dept Mat Sci &

    Engn Mianyang 621010 Sichuan Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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