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- 2018
吸附重金属Cr(Ⅵ)后Fe3O4@P(St-HPMA-DVB)-Cr(Ⅵ)复合材料的表征及回收用于水中氯酚的催化降解
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Abstract:
采用超声协助悬浮聚合法制备了氨基功能化Fe3O4@聚（苯乙烯（St）-3-（2-氨基四乙基五胺）-2-甲基丙烯酸羟丙酯（HPMA）-二乙烯基苯（DVB）（Fe3O4@P（St-HPMA-DVB））磁性复合材料，将其用于处理含Cr（Ⅵ）水溶液，得到吸附重金属Cr（Ⅵ）后回收的Fe3O4@P（St-HPMA-DVB）-Cr（Ⅵ）复合材料。通过TEM、振动样品磁强计（VSM）、TGA、XRD、元素分析（EA）、FTIR等对其进行表征。以Fe3O4@P（St-HPMA-DVB）-Cr（Ⅵ）为催化剂，研究其在H2O2作用下催化降解水中2，4，6-三氯酚（2，4，6-TCP）的性能。发现，当Fe3O4@P（St-HPMA-DVB）-Cr（Ⅵ）中Cr（Ⅵ）的固载量为200 mg/g，溶液pH值为3.0~4.5，H2O2浓度≥4.08 mmol/L时，Fe3O4@P（St-HPMA-DVB）-Cr（Ⅵ）/H2O2体系可以实现对浓度<20.0 mg/L（101.3 μmol/L）的TCP溶液在10 min内近100%的降解。循环使用5次后，该催化体系对TCP的降解率仍能保持95%以上。 An amino-functionalized nano Fe3O4@poly(styrene (St)-3-(2-amino tetraethylenepentamine)-2-hydroxypropyl methacrylate (HPMA)-divinylbenzene(DVB)) (Fe3O4@P(St-HPMA-DVB)) magnetic composite was synthesized via ultrasonic assisted suspension polymerization and applied for adsorption of Cr(Ⅵ) in aqueous. The post-absorbed Fe3O4@P(St-HPMA-DVB)-Cr(Ⅵ) magnetic composite was collected and characterized by TEM, vibrating sample magnetometer (VSM), TGA, XRD, elemental analysis (EA) and FTIR. The application for its catalytic properties as the heterogeneous catalyst for the degradation of 2,4,6-trichlorophenol(2,4,6-TCP) was investigated. The results show that when loading amount of Cr(Ⅵ) at 200 mg/g on the Fe3O4@P(St-HPMA-DVB)-Cr(Ⅵ), the solution pH value at 3.0-4.5, and H2O2 concentration above 4.08 mmol/L, the degradation of 2,4,6-TCP with initial concentration less than 20.0 mg/L (101.3 μmol/L) can be achieved nearly 100% within 10 min by the Fe3O4@P(St-HPMA-DVB)-Cr(Ⅵ)/H2O2 system. Fe3O4@P(St-HPMA-DVB)-Cr(Ⅵ) can be reused after recycling for 5 times, with degradation percentage of 2,4,6-TCP still remaining over 95%. 国家自然科学基金（51608479）；浙江省自然科学基金（LY14B04003）；国家级大学生创新创业训练计划项目（201713022009）；宁波市新苗计划项目（甬教基2016-415）
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