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Photothermal membrane distillation performance of ceramic based Carbon nanotubes composite membrane

Authors： Jia Mingjuan, Ji Guozhao, Dong Yingchao

Units： Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China

KeyWords： ceramic membrane; carbon nanotubes; photothermal membrane distillation; photothermal conversion; desalination

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(6):41-47

Abstract：

Construction of a new photothermal multifunctional membrane interface is of great significance. Alumina (Al2O3) membrane was used as the substrate to prepare ceramic-based carbon nanotubes (Al2O3-CNTs) composite membrane by in situ chemical vapor deposition (CVD) process. The interconnected CNTs network structure provides better superhydrophobicity (water contact angle 171.0°) and efficient photothermal conversion performance for the composite membrane. The nitrogen permeance of Al2O3-CNTs is 1135.14 m3/ (m2·h·Mpa), while the liquid entry pressure is 0.15 MPa. After 600 s irradiation of simulated solar, the surface temperature of the composite membrane increased to 82.7 ℃, and the light absorption rate was 66.2%. The results of traditional and photothermal membrane distillation show that the flux of the composite membrane under 4 kW/m2 solar irradiation is 33.7% higher than that of the traditional membrane distillation for 3.5% NaCl solution (75 ℃, 60 r/min flow rate), and the solar energy utilization efficiency was 22.7%. Both salt rejection (99.8%) and permeate salt concentration remained stable during operation, indicating that Al2O3-CNTs composite membrane has good photothermal membrane distillation performance.

Funds：

国家重点研发专项项目（2019YFA0705803）；国家自然科学基金项目（21876020，52070033）和企业横向课题（HX20190810）

AuthorIntro：

贾明娟（1996-），女，河南郑州，硕士研究生，研究方向为陶瓷基纳米碳复合膜的设计制备及水处理性能研究

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