• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Amino organosilane grafted ordered mesoporous alumina with enhanced adsorption performance towards Cr(VI)
【24h】

Amino organosilane grafted ordered mesoporous alumina with enhanced adsorption performance towards Cr(VI)

机译：氨基有机硅烷接枝有序介孔氧化铝，增强了Cr（VI）的吸附性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ordered mesoporous alumina (MA) was successfully modified with three amino organosilanes including 3aminopropyltriethoxysilane (1N), N-(beta-aminoethyl)-gamma-aminopropylmethylbimethoxysilane (2N) and N-3-trimethoxysilylpropyldiethylenetriamine (3N) via a facile grafting method, and the as-prepared amino organosilane grafted MA-1N, MA-2N and MA-3N show enhanced adsorption performance towards Cr(VI) removal from wastewater. Their physicochemical properties and the MA before modification were comparatively characterized by FT-IR, TEM, XRD, N-2 adsorption-desorption, CHNS elemental analysis, zeta potential measurements and XPS. Their adsorption performance was also comparatively studied along with the effect of contact time, adsorption isotherms, multi-metal ion adsorption, interference of co-existing anions and regeneration ability in batch experiments. It was found that their adsorption kinetics data were better fitted by the pseudo-second order model; adsorption isotherms were better described by the Langmuir isotherm for MA-1N, the Freundlich isotherm for MA-2N and the Temkin isotherm for MA-3N. Among them, MA-2N shows the maximum adsorption capacity of 137.9 mg g(-1) which is more than twice the 59.4 mg g(-1) of MA. The residual concentration of Cr(VI) with a concentration of 50 mg L-1 when treated with MA-2N meets the emission standard of the World Health Organization (WHO). Moreover, MA-2N shows better selectivity toward Cr(VI), and can reduce relatively more Cr(VI) to low toxicity Cr(III). More results were found that Cr(VI) is adsorbed on the surface through a monodentate ligand or bidentate ligand, and then Cr(VI) is reduced to Cr(III) by an adjacent electron donor, after which Cr(III) is co-precipitated with the adsorbents. All the amine-grafted samples show good reusability for 5 cycles. These results indicated that the amino organosilane grafted ordered MA with high adsorption capacity, good selectivity and favourable reusability is a promising candidate for Cr(VI) removal, in combination with its low cost and energy saving preparation process.
机译：用三种氨基有机硅烷成功修饰有序的介孔氧化铝（MA），包括3氨基丙基三乙氧基硅烷（1N），N-（β-氨基乙基） - 氨基丙基甲基双甲氧基硅烷（2N）和N-3-三甲氧基甲硅烷酰丙基二乙基三胺（3N），通过容易移植方法，以及制备的氨基有机硅烷接枝MA-1N，MA-2N和MA-3N显示出从废水中的Cr（VI）的增强的吸附性能。通过FT-IR，TEM，XRD，N-2吸附 - 解吸，CHNS元素分析，Zeta潜在测量和XPS，它们在修饰之前的物理化学性质和MA在较常见的特征。它们的吸附性能以及接触时间，吸附等温线，多金属离子吸附，共存阴离子的干扰和分批实验中的再生能力的影响。发现它们的吸附动力学数据更好地由伪二次阶模型安装;对于MA-2N的Freundlich等温线和MA-3N的Temkin等温线，Langmuir等温线更好地描述了吸附等温物。其中，MA-2N显示了137.9mg G（-1）的最大吸附容量，其大于MA的59.4mg G（-1）的两倍。当用MA-2N处理时，浓度为50mg L-1的Cr（VI）的残余浓度符合世界卫生组织（世卫组织）的排放标准。此外，MA-2N显示出对Cr（VI）的更好的选择性，并且可以将相对较高的Cr（VI）减少到低毒性Cr（III）。将CR（VI）吸附在表面上通过单齿配体或二齿配体吸附在表面上，然后通过相邻的电子供体将Cr（VI）还原为Cr（III），之后Cr（III）是共同的用吸附剂沉淀。所有胺接枝样品都显示出5个循环的良好可重用性。这些结果表明，具有高吸附能力的氨基有机硅烷接枝的MA具有高吸附能力，良好的选择性和有利可重用性是CR（VI）去除的有希望的候选者，以及其低成本和节能制备过程。

著录项

  • 来源
    《RSC Advances》 |2017年第84期|共11页
  • 作者

    Jin Xin; Cai Weiquan; Cai Zhijun;

  • 作者单位

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures Sch Chem Chem Engn &

    Life Sci 205 Luoshi Rd Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures Sch Chem Chem Engn &

    Life Sci 205 Luoshi Rd Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Int Sch Mat Sci &

    Engn 205 Luoshi Rd Wuhan 430070 Hubei Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号