研究报告
王志超,杜春慧,胡锦泰,陈芬.季铵化纳米SiO2-N+@PCMS荷电改性正渗透复合膜及其对四环素的分离性能[J].环境科学学报,2022,42(7):290-298
季铵化纳米SiO2-N+@PCMS荷电改性正渗透复合膜及其对四环素的分离性能
- Charged modification of quaternized nano SiO2-N+@PCMS forward osmosis composite membrane and its separation property to tetracycline
- 基金项目：浙江省基础公益研究计划项目（No. LGF21E080008）
- 作者
- 单位
- 王志超
- 浙江工商大学环境科学与工程学院，杭州 310018
- 杜春慧
- 浙江工商大学环境科学与工程学院，杭州 310018
- 胡锦泰
- 浙江工商大学环境科学与工程学院，杭州 310018
- 陈芬
- 浙江工商大学环境科学与工程学院，杭州 310018
- 摘要：通过化学法合成叔胺化纳米SiO2（SiO2-N）和聚对氯甲基苯乙烯（PCMS），利用SiO2-N中的叔胺基与PCMS中的氯甲基反应，生成大分子季铵化纳米SiO2（SiO2-N+@PCMS），通过进一步与聚偏氟乙烯（PVDF）共混，以相转化法制备纳米荷电改性的PCMS/PVDF支撑底膜，进而采用界面聚合法制备正渗透（FO）复合膜.采用红外光谱、扫描电镜、zeta电位计和接触角测定仪等对支撑底膜和FO膜表面的化学结构、形貌、荷电性和亲水性等进行了分析，并通过正渗透装置对膜的分离性能进行了测试.结果表明该改性正渗透膜具有较好的荷正电性能，且随着SiO2-N的加入可以有效提高正渗透膜的亲水性和分离性能，添加2 %的SiO2-N改性正渗透膜的纯水通量最高可达到22.76 L·m-2·h-1，对四环素的截留率可达到98.5 %，经3次水-四环素-水循环过滤后，纯水通量恢复率仍然可达到90.1%.
- Abstract：Tertiary aminated nano silica（SiO2-N） and poly （p-chloromethyl styrene）（PCMS） were synthesized by chemical methods， respectively. The macromolecular quaternized nano SiO2（SiO2-N+@PCMS）was prepared by the reaction between the chloromethyl group in PCMS and the tertiary amine group on SiO2-N. the reaction products were blended with polyvinylidene fluoride （PVDF） to prepare the nano and charge-modified PCMS/PVDF supported membranes via the phase inversion method， and then the interfacial polymerization technique was further used to fabricate the forward osmosis （FO） composite membrane. Infrared spectroscopy， scanning electron microscope， zeta potentiometer and contact angle instrument were used to analyze the chemical structure， morphology， charged property and hydrophilicity of the supported membrane and FO membrane surface， the permeation performance of FO membrane was also carried out. The results indicated that the modified FO membranes exhibited good positive charged property， and with the addition of SiO2-N， the hydrophilicity and separation property of the FO membranes were effectively improved. The pure water flux of the modified forward osmosis membrane with 2% SiO2-N reached up to 22.76 L·m-2·h-1， and the rejection ratio of tetracycline was 98.5%. After three cycles of water-tetracycline-water filtration， the pure water flux recovery rate still retained 90.1%.
- Key words：nano silica polyvinylidene fluoride forward osmosis membrane charged property separation property
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