凹凸棒石/C复合材料的制备及其吸附性能研究

Research on Synthesis and Adsorption Performance Test of Attapulgite/Carbonization Composite Materials

以凹凸棒石和葡萄糖为原料,采用水热法制备凹凸棒石/C复合材料(标记为AT@C)。通过正交试验设计探讨了凹凸棒石/C复合材料对间苯二酚的吸附性能,并利用傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、热重分析(TG)、扫描电子显微镜(SEM)手段对复合材料进行表征,考察了pH值对复合材料去除溶液中间苯二酚的影响,并探讨了其吸附过程。结果表明,当水热反应温度为160℃、凹凸棒石和葡萄糖质量比为1∶1、碳化时间为18 h时,制备的AT@C复合材料吸附间苯二酚效果较好。在pH值为3~9时,间苯二酚的去除率随着pH值升高而减小,当pH值为3时,复合材料对间苯二酚的吸附效果最好,符合Langmuir吸附方程,复合材料的高温残留率从44.4%提高到62.1%。葡萄糖水热碳化的产物负载在凹凸棒石表面,存在-OH和葡萄糖碳化生成的-C=C,提高了复合材料的吸附性能。

The attapulgite/carbonization composite materials （short for AT@C） were prepared from attapulgite and glucose as active carbon material by hydrothermal carbonization method. Orthogonal experimental design to investigate the adsorption of resorcinol on attapulgite/C composites. The attapulgite/C composites was characterized by using Fourier transform infrared spectra（FTIR）, X-Ray powder diffraction （XRD）, thermogravimetric analysis（TG） and scanning electron microscopy（SEM）. The effects of pH on the removal of resorcinol from aqueous solution were investigated, and the mechanism of resorcinol adsorption was explored. The results showed that the removal of resorcinol from aqueous solution reached maximum under the conditions as follows： hydrothermal temperature was 160 ℃for 18 h with attapulgite to glucose mass ratio of 1 ： 1. In the pH range of 3-9, the removal rate of resorcinol decreased with the increase of pH. The maximum removal rate reached at pH value of 3, the adsorption of resorcinol on attapulgite/C comiposites could be well described by Langmuir model. The residual rate of attapulgite/C composites increased from 44.4% to 62.1% in the high temperature. The product of glucose hydrothermal carbonization was loaded on the surface of attapulgite, possessing the groups of -OH and -C=C from the carbonization of glucose, which improved the adsorption performance of composite materials.