Enhancement of Phosphate Adsorption on Zirconium, Hydroxide by Ammonium Modification
Enhancement of Phosphate Adsorption on Zirconium, Hydroxide by Ammonium Modification
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DOI：
10.1021/acs.iecr.7b01523
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发表时间：
2017-08-30
影响因子：
4.2
通讯作者：
Luo, Jinming
中科院分区：
文献类型：
--
作者：
Luo, Xubiao;Wu, Xing;Luo, Jinming
吸附剂的表面改性对其吸附性能起着至关重要的作用。此外，改性中最重要的一步是根据目标污染物设计改性基团。本研究采用不同的铵化改性方法提高氢氧化锆对磷酸盐的吸附性能，从而提高吸附位的利用率。二甲胺改性氢氧化锆的最大容量为1 ~ 55.04mg/g。与未修饰的氢氧化锆相比，二甲胺修饰后的氢氧化锆对Cl-、SO（4）（2-）和NO 3-的选择性因子均提高近2倍。使用N-甲基苯胺和N-乙基甲胺时，传质速率K-2也提高了6倍。Zeta电位和FT-IR结果表明，复合材料对磷酸根的吸附能力增强与复合材料的内球络合作用、静电相互作用（季铵基和磷酸根）和配体交换（氢氧化锆和磷酸根的羟基）直接相关。此外，通过二甲胺改性，吸附剂上羟基的利用率从22.9%提高到33.9%，这一点也得到了XPS的证实。改性氢氧化锆在真实的废水中表现出良好的抗干扰性能。总的来说，改性氢氧化锆被认为具有很大的工程应用潜力，而提高吸附位利用率的方法则为其他吸附体系提供了一条新的途径。
Surface modification of adsorbents plays a crucial role in its adsorption performance. Furthermore, the most important step in modification is to design the modification groups based on target pollutants. In this study, the phosphate adsorption performance of zirconium hydroxide was enhanced by different ammonium modification as a result of increasing utilization efficiency, of adsorption site. The maximum capacity is 1-55.04 mg/g from the zirconium hydroxide modified by dimethylamine. In comparison with undecorated zirconium hydroxide; the selectivity factors for Cl-, So(4)(2-), and NO3- are all raised by almost 2 times by dimethylamine modification. The mass transfer rate K-2 also increase 6 times using N-methylaniline and N-ethylmethylamine. Results from zeta-potential and FT-IR revealed that the enhanced adsorption capacity for phosphate were directly related to the inner-sphere complex and electrostatic interactions (quaternary ammonium groups and phosphate) and ligand exchange (the hydroxyl groups of zirconium hydroxide and phosphate). Moreover, the utilization ratios of hydroxyl groups on adsorbents were improved from 22.9% to 33.9% by dimethylamine modification, which is proved by XPS. At last, the modified zirconium hydroxide presents excellent performances of anti-interference in real wastewater. Overall, modified zirconium hydroxide is considered to have great potential for engineering application, and then the method of increased utilization of the adsorption site gives a new route for other adsorption systems.