Highly efficient and robust oxygen vacancy-rich molybdenum trioxide aerogel evaporator for Photothermal conversion and clean water generation

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2024-11-06 DOI:10.1016/j.desal.2024.118281

Peng Xiang , Congming Tang , Kai Ma , Xinli Li

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引用次数: 0

Abstract

Interfacial evaporation of seawater and other wastewater is used to produce clean water by the infinite solar energy which attracts an intense interest and displays a great prospect. An efficient and robust photothermal evaporator is a key to solar-driven interfacial evaporation. Herein, the oxygen vacancy-rich MoO₃ aerogel evaporator is designed to purify seawater and wastewater. Hydrogen etching is used to construct oxygen vacancies of MoO₃, which regulate its optical and thermophysical properties. MoO₃* possesses stronger broadband absorption and lower reflectance than MoO₃ across the wavelength ranges of 200 nm–2500 nm, which insures more energy input. Besides, band gap energy of MoO₃* decreases from 2.90 eV of MoO₃ to 1.92 eV, which is more beneficial for the visible light absorption and its degradation of organic pollutant. As a result, the MoO₃*-based evaporator displays a higher evaporation rate of 1.78 kg m⁻² h⁻¹ as well as 92.6 % of efficiency for pure water at 1 sun illumination, in contrast to the MoO₃-based evaporator with an evaporation rate of 1.04 kg m⁻² h⁻¹ and 60.0 % efficiency, suggesting that oxygen vacancies induced by hydrogen etching improve photothermal conversion efficiency. In practical application, the MoO₃*-based evaporator also displays an excellent purification performance for seawater, heavy metal wastewater and tetracycline wastewater, in which the evaporation rates are close to pure water, and the quality of the purified water is better than drinking water specified by WHO standard. In addition, the defected MoO₃*-based aerogel evaporator not only possesses an excellent thermal management, but also offers an excellent salt self-cleaning ability. This work convincingly demonstrates that the “defect chemistry” is perfect for constructing the defected MoO₃* aerogel evaporator for sustainable production of clean water from seawater, heavy metal wastewater and tetracycline wastewater by means of the solar-driven interfacial evaporation.

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高效坚固的富氧空位三氧化钼气凝胶蒸发器，用于光热转换和清洁水发电

利用无限的太阳能对海水和其他废水进行界面蒸发来生产清洁水，这引起了人们的浓厚兴趣，并展现出巨大的前景。高效、坚固的光热蒸发器是太阳能驱动界面蒸发的关键。在此，我们设计了富含氧空位的 MoO3 气凝胶蒸发器来净化海水和废水。利用氢蚀刻技术在 MoO3 中构建氧空位，从而调节其光学和热物理性质。在 200 nm-2500 nm 波长范围内，MoO3* 比 MoO3 具有更强的宽带吸收能力和更低的反射率，从而保证了更多的能量输入。此外，MoO3* 的带隙能从 MoO3 的 2.90 eV 下降到 1.92 eV，这更有利于可见光的吸收和有机污染物的降解。因此，与蒸发率为 1.04 kg m-2 h-1 和效率为 60.0 % 的基于 MoO3* 的蒸发器相比，基于 MoO3* 的蒸发器在 1 太阳光照射下的纯水蒸发率更高，达到 1.78 kg m-2 h-1 和 92.6 % 的效率，这表明氢蚀刻诱导的氧空位提高了光热转换效率。在实际应用中，基于 MoO3* 的蒸发器对海水、重金属废水和四环素废水也表现出优异的净化性能，蒸发率接近纯水，净化后的水质优于世界卫生组织规定的饮用水标准。此外，基于缺损 MoO3* 的气凝胶蒸发器不仅具有出色的热管理性能，还具有出色的盐自清洁能力。这项工作令人信服地证明，"缺陷化学 "非常适合构建缺陷 MoO3* 气凝胶蒸发器，通过太阳能驱动的界面蒸发从海水、重金属废水和四环素废水中持续生产清洁水。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.