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首页> 外文期刊>Journal of Applied Polymer Science >Unsupported electrospun membrane for water desalination using direct contact membrane distillation
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Unsupported electrospun membrane for water desalination using direct contact membrane distillation

机译：使用直接接触膜蒸馏不支持静电纺锤用于水脱盐

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摘要

In this project, an unsupported electrospun poly(vinylidene fluoride)-co-hexafluoropropylene (PVDF-HFP) membrane was used for water desalination using direct contact membrane distillation (DCMD). The membrane was electrospun using a laboratory-scale machine with multiple nozzles that was developed in-house. Critical process parameters, including the applied voltage and polymer concentration, were optimized to obtain bead-free electrospun membranes with fiber diameters less than 300 nm. To improve the membrane thermal stability and performance, the selected electrospun membrane was heat-pressed at 160 degrees C. The untreated and heat-pressed membranes were tested in a DCMD setup at different feed temperatures (60, 70, and 80 degrees C) and feed flow rates (0.4, 0.6, and 0.8 L/min), while maintaining the permeate temperature and flow rate at 20 degrees C and 0.2 L/min, respectively. The modified electrospun membrane exhibited a very high permeate flux (>37.5 kg/m(2)/h) and a salt rejection rate of 99.99% at a feed temperature of 70 degrees C. The performance of the heat-pressed unsupported PVDF-HFP electrospun membrane was nearly identical to a commercially available polytetrafluoroethylene (PTFE) supported membrane. These promising results demonstrate that relatively low-cost electrospun membranes can be easily produced and successfully used in DCMD to minimize the capital cost and increase the energy efficiency of the process.
机译：在本项目中，使用无支撑电纺聚偏氟乙烯-六氟丙烯（PVDF-HFP）膜，通过直接接触膜蒸馏（DCMD）进行海水淡化。使用实验室规模的多喷嘴机器对膜进行静电纺丝，该机器由内部开发。优化了关键工艺参数，包括施加电压和聚合物浓度，以获得纤维直径小于300nm的无珠静电纺丝膜。为了提高膜的热稳定性和性能，选择的静电纺丝膜在160℃下进行热压。在DCMD装置中，在不同的进料温度（60、70和80℃）和进料流速（0.4、0.6和0.8 L/min）下测试未经处理和热压的膜，同时将渗透温度和流速保持在20℃和0.2 L/min，分别地在70℃的进料温度下，改性电纺膜具有很高的渗透通量（>37.5 kg/m（2）/h）和99.99%的盐截留率。热压无支撑PVDF-HFP电纺膜的性能与市售聚四氟乙烯（PTFE）支撑膜几乎相同。这些有希望的结果表明，相对低成本的静电纺丝膜可以很容易地生产，并成功地用于DCMD，以最大限度地降低资本成本，提高工艺的能源效率。

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