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陶瓷基碳纳米管复合膜的光热膜蒸馏性能研究

作者：贾明娟，姬国钊，董应超

单位：工业生态与环境工程教育部重点实验室，大连理工大学环境学院，大连116024

关键词：陶瓷膜；碳纳米管；光热膜蒸馏；光热转换；脱盐

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2022,42(6):41-47

摘要：

构筑新型光热多功能蒸馏膜界面具有重要的研究价值，本研究以氧化铝（Al2O3）陶瓷膜作为载体，通过原位化学气相沉积（CVD）过程制备了氧化铝-碳纳米管（Al2O3-CNTs）复合膜，复杂交错的CNTs网络结构同时为复合膜提供了较好的疏水性以及高效的光热转换性能。Al2O3-CNTs膜的氮气渗透性为1135.14 m3/(m2·h·MPa)，水接触角达到171.0°，液体浸润压力为0.15 MPa。复合膜在模拟太阳辐照下辐照600 s后，表面温度升高至82.7 ℃，光吸收率最高可达66.2%。通过研究传统膜蒸馏及光热膜蒸馏性能，结果表明，在进料液温度为75 ℃，流速为60 r/min，进料液为质量分数3.5% NaCl溶液的情况下，相比于传统膜蒸馏过程，该复合膜在4个太阳（4 kw/m-2）的光照强度下，通量提升率为33.7%，太阳能利用效率达到22.7%，同时盐截留率（>99.8%）和渗透侧电导率（<60.0 µs/cm）在运行过程中保持稳定，表明特殊设计的Al2O3-CNTs复合膜具有较好的光热膜蒸馏性能。

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.

基金项目：

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）

作者简介：

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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