Evaluation of photothermal evaporation performance of novel polydopamine nanoparticles
Polydopamine is a popular near-infrared absorbing polymer material,which has light-absorbing properties similar to melanin and a good prospect in photothermal conversion.However,due to its diverse polymerization mechanism and complex internal structure,there are few reports on the functional design of polydopamine.In this work,Fe3+ and silane coupling agent were designed to react with dopamine,so as to improve the light absorption properties and hydrophilicity of polydopamine.According to X-ray photoelectron spectroscopy(XPS)and Fourier transform infrared spectroscopy(FTIR),high absorbance hydrophilic polydopamine nanoparticles were successfully synthesized,and the absorbance reached 90％.Moreover,the synthesized nanoparticles were vacuum-filtered and stacked to construct hydrophilic transport channels.Pure water experiment was performed on the proposed photothermal film at one sunlight intensity under sunlight evaporation environment.Results showed that the evaporation rate of pure water reached 1.1 kg/(m2·h)and the photothermal conversion efficiency was 80％,which was 15％higher than that of ordinary polydopamine,proving that the new material developed in this study has good photothermal conversion performance and has a good application prospect in the field of seawater desalination.
photothermal evaporationpolydopaminesilane coupling agentphotothermal nanoparticlesphotothermal film
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维普
