Abstract In this paper, a metakaolin-based mesoporous geopolymer (GP-CTAB) was used as adsorbent for Cu(II) and Cr(VI) through a novel and simple synthetic route using cetyltrimethylammonium bromide (CTAB) as an organic modifier. The application of GP-CTAB for the simultaneous removal of metal anions and cations in aqueous solution was studied for the first time. The results of X-ray diffraction (XRD) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Brunauer, Emmett and Teller (BET), and Barrett, Joyner, and Halenda (BJH) methods indicate that GP-CTAB is still geopolymer even in the presence of quaternary ammonium salt cations. The material was tested to simultaneously adsorb Cu(II) and Cr(VI) from an aqueous solution. The results show that GP-CTAB can adsorb anions simultaneously without sacrificing the adsorption properties of heavy metal cations, which is superior to conventional geopolymers. The maximum theoretical adsorption capacity of GP-CTAB for Cu(II) and Cr(VI) was 108.2 mg/g and 95.3 mg/g in the binary system, respectively. It was also found that the presence of Cu(II) in the solution promoted the adsorption of Cr(VI). Given this characteristic of GP-CTAB, it has shown great application prospects in the prevention and control of heavy metal pollution.

中文翻译：

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有机改性偏高岭土地质聚合物同时吸附 Cu(II) 和 Cr(VI) 的改进

摘要 在本文中，通过使用十六烷基三甲基溴化铵 (CTAB) 作为有机改性剂的新型简单合成路线，将偏高岭土基介孔地质聚合物 (GP-CTAB) 用作 Cu(II) 和 Cr(VI) 的吸附剂。首次研究了GP-CTAB同时去除水溶液中金属阴阳离子的应用。X 射线衍射 (XRD) 光谱、傅里叶变换红外 (FTIR) 光谱、Brunauer、Emmett 和 Teller (BET) 以及 Barrett、Joyner 和 Halenda (BJH) 方法的结果表明 GP-CTAB 仍然是地质聚合物，即使在季铵盐阳离子的存在。该材料经测试可同时从水溶液中吸附 Cu(II) 和 Cr(VI)。结果表明，GP-CTAB可以同时吸附阴离子而不牺牲重金属阳离子的吸附性能，优于常规地质聚合物。二元体系中GP-CTAB对Cu(II)和Cr(VI)的最大理论吸附容量分别为108.2 mg/g和95.3 mg/g。还发现溶液中Cu(II)的存在促进了Cr(VI)的吸附。鉴于GP-CTAB的这一特点，它在重金属污染的防治中显示出巨大的应用前景。