摘要
膜污染引起膜通量下降,导致膜使用寿命的降低以及运行成本的升高,制约着膜技术的发展。为缓解膜污染,合成具有紫外-可见光响应的Ag_3PO_4/TiO_2纳米材料,并应用于聚偏氟乙烯(PVDF)膜改性,制备了新型膜材料。通过原子力显微镜、接触角测定、光催化降解能力测试、循环过滤实验等研究其性能。实验表明,与PVDF膜相比,Ag_3PO_4/TiO_2-PVDF膜表面更平滑,平均粗糙度由64.9 nm下降至30.8 nm;亲水性得到改善,接触角初始值为58.8°,下降速率为1.12°/min;具有自然光下催化氧化降解罗丹明B的自清洁能力,将其含量由86.1%降至65.5%;在循环过滤中难被污染、易于清洗,保持较大的通量恢复率。
Membrane fouling, which can cause a decline in permeate flux, shorten membrane life and increase the operating costs, is a main obstacle hindering wider application of membrane technologies. A novel Ag3PO4/TiO2-polyvinylidene fluoride （PVDF） composite membrane is fabricated to mitigate membrane fouling. The properties of membranes are characterized based on atomic force microscope, contact angle measurement, photocatalytic behavior and recycle filtration experiment. The Ag3PO4/TiO2-PVDF membrane has smoother surface and results in the reduction of root mean square value （30.8 nm） comparingto that 64.9 nm of the PVDF membrane. The contact angle with an initial value of 58.8% and a 1.12% per minute decreased velocity indicate the increasing of hydrophilicity. It also shows relatively outstanding photocatalytic degradation capacity with natural light irradiation which causes the concentration of Rhodamine B ratio in solution decreasing from 86.1% to 65.5%. The Ag3PO4/TiO2-PVDF membrane is hard to be fouled, easy to be rinsed and maintain good ability to recover during the recycle filtration system.
作者
郭慧
鲍建国
冯群
杜江坤
冷一非
GUO Hui1, BAO Jianguo1, FENG Qun2, DU Jiangkun1, LENG Yifei1(1.School of Environment Studies, China University of Geosciences, Wuhan 430074, China; 2. School of Chemistry and Environment Engineering, Baise University, Baise 533000, Chin)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2018年第1期16-21,共6页
Environmental Science & Technology
基金
国家自然科学基金面上项目(41373083)
国家自然科学基金国际(地区)合作与交流项目(41611130185)
矿区环境污染控制与修复湖北省重点实验室开放基金(2014103)
