纳米氧化物@微晶纤维素的辐射制备及其对三氯乙酸的吸附去除

Radiation preparation of nano-oxide@microcrystalline cellulose and its adsorption and removal of trichloroacetic acid

作为饮用水消毒常见的非挥发性副产物,三氯乙酸(Trichloroacetic acid,TCA)对人体具有致癌的危害性。本研究通过预辐射接枝包埋法成功制备了4种纳米氧化物@微晶纤维素基吸附剂(P25@微晶纤维素、SiO_(2)@微晶纤维素(MCC-g-GMA@SiO_(2))、Fe_(3)O_(4)@微晶纤维素和Fe_(2)O_(3)@微晶纤维素),探究其对饮用水中TCA的去除率。利用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、热重(TG)分析、扫描电子显微镜(SEM)等表征手段对材料的微区形貌、表面结构及吸附性能进行了表征与测试,并系统对比探讨了不同单体浓度、包埋物浓度、吸收剂量等对其增重率的影响。通过对4种包埋的纳米氧化物进行吸附实验对比,得到了完整的静态吸附平衡曲线。结果表明:SiO_(2)@微晶纤维素性能明显优于其他3种吸附剂,且单体浓度体积百分数在30%、包埋物质量百分数为4%、吸收剂量在60 kGy时,对饮用水中TCA的去除率达到83.27%。该系列吸附材料在饮用水净化领域具有重要的应用价值。

Trichloroacetic acid is a common nonvolatile byproduct of drinking water disinfection and poses carcinogenic risks to the human body.In this study,four types of nano-oxide@microcrystalline-cellulose-based adsorbents(P25@microcrystalline cellulose,SiO_(2)@microcrystalline cellulose(MCC-g-GMA@SiO_(2)),Fe_(3)O_(4)@microcrystalline cellulose,and Fe_(2)O_(3)@microcrystalline cellulose)were successfully prepared by the preradiation grafting-embedding method.Subsequently,their ability to remove trichloroacetic acid from drinking water was investigated.The micro zonation morphology and surface properties of the materials were characterized and tested using Fourier transform infrared spectroscopy(FTIR),X-ray diffraction spectroscopy(XRD),Thermogravimetric(TG)analysis,and Scanning electron microscopy(SEM)characterization methods.The effects of monomer concentration,embedding concentration,and absorbed dose on the weight gain rate were systematically investigated.A complete static adsorption equilibrium curve was obtained on the basis of the results of adsorption experiments of four buried nano-oxides.The performance of SiO_(2)@microcrystalline cellulose was found to be significantly higher than that of the other three adsorbents.When the volum percentage of monomer concentration was 30%,the mass percentage of embedding concentration was 4%,and the absorbed dose was 60 kGy,the removal rate of trichloroacetic acid in drinking water reached 83.27%.This series of adsorbent materials present significant potential for practical application in drinking water purification.