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Functionalization of Xonotlite Composite with Amidoxime Groups for the Sorption of Cu (II) Ion
Water, Air, & Soil Pollution ( IF 2.9 ) Pub Date : 2020-07-25 , DOI: 10.1007/s11270-020-04776-8
Wei Zhou , Wenqing Tang , Junliang Xin

The xonotlite was synthesized from eggshell waste and modified with toluene diisocyanate (TDI). The xonotlite and amidoxime-modified xonotlite were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). FTIR revealed that the amidoxime group was successfully grafted onto the xonotlite. Factors affecting adsorption such as solution pH, adsorbent dose, contact time, and initial concentrations were set up to improve the adsorption performance. The adsorption of Cu (II) on all the adsorbents was well-described by the Freundlich model and pseudo-second-order model. The amidoxime-modified xonotlite showed rapid removal efficiency and reached equilibrium in 45 min at the pH of 5. The maximum adsorption capacities for Cu (II) (713.2 mg/g) on the modified xonotlite were 35.8% higher than that on the unmodified xonotlite. The existence of competing ions like K(I) and Na(I) had little effect on the Cu(II) removal efficiency. Therefore, the modified xonotlite could be used as a feasible adsorbent for the removal of Cu (II) in treating wastewater.

中文翻译:

含磷酰胺基团的硬硅钙石复合材料对铜(II)离子的吸附功能

硬硅钙石由蛋壳废料合成,并用甲苯二异氰酸酯(TDI)改性。硬硅钙石和a胺肟改性的硬硅钙石通过扫描电子显微镜(SEM),傅立叶变换红外光谱(FTIR)和X射线衍射(XRD)进行表征。FTIR显示the胺肟基已成功嫁接到硬硅钙石上。设置影响溶液吸附的因素,例如溶液的pH值,吸附剂剂量,接触时间和初始浓度,以提高吸附性能。Freundlich模型和拟二级模型很好地描述了Cu(II)在所有吸附剂上的吸附。mid胺肟改性的硬硅钙石显示出快速的去除效率,并在pH值为5的情况下在45分钟内达到平衡。改性的硬硅钙石对Cu(II)的最大吸附容量为713.2 mg / g。比未改性硬硅钙石高8%。竞争离子(如K(I)和Na(I))的存在对Cu(II)去除效率的影响很小。因此,改性硬硅钙石可作为一种可行的吸附剂,用于去除废水中的铜(II)。
更新日期:2020-07-25
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