Hydrogel-based photothermal evaporator for efficient solar desalination and synergistic removal of volatile organic compounds

MXene/CdS photothermal–photocatalytic hydrogels for efficient solar water evaporation and synergistic degradation of VOC

“…Compared with the MH without the incorporation of a CdS photocatalyst, the removal rate of a VOC was significantly enhanced by MCH-2. It can be explained by the following reasons: (1) the combination of Ti 3 C 2 MXene and CdS enhances the light absorption performance of the composites; (2) hydrogels provide a rich porous network structure and surface functional groups, which promote the transport of pollutants and make them fully in contact with the active sites of the photocatalysts, and are degraded by the reactive oxygen species (ROS) generated by photocatalysis 57 under light irradiation; (3) the local photothermal effect generated by the LSPR effect of Ti 3 C 2 MXene improves the photocatalytic reactivity. 58 Interestingly, when the light intensity increased to 2.0 sun, the photocatalytic degradation effect of MCH-2 on phenol was the best, and then slightly reduced, but the degradation rate of 88.51% was still maintained at 2.5 sun (Fig.…”

“…It may be that when the light intensity is enhanced, the interface evaporation rate is accelerated, and the contact time with the photocatalyst during the upward escape of phenol with steam is insufficient. 19,57,59 The same method was used to study the removal ability of the MC complex hydrogels on antibiotic (MNZ) wastewater during photothermal evaporation. From Fig.…”

Green polyphenol-based photothermal interfacial evaporation systems toward solar water production

“…This makes it difficult to produce clean water through a separate interfacial desalination process. 162–167 Therefore, it is necessary to manufacture polyphenol-based multifunctional PIES to face the challenges brought by severe real-life applications.…”

Green Synthesis of Polyurethane Sponge-Grafted Calcium Alginate with Carbon Ink Aerogel with High Water Vapor Harvesting Capacity for Solar-Driven All-Weather Atmospheric Water Harvesting

“…It is notable that sodium alginate (SA) is a naturally biodegradable polymer that contains plenty of hydrophilic groups and can form hydrogels by simple physical or chemical cross-linking reactions . When used as an AWH material, it can effectively promote water absorption and evaporation due to the abundant –OH and –COOH groups within it . For example, Wu successfully prepared MXene-doped UiO-66-NH 2 composites inside the SA with three-dimensional network structure as AWH adsorbents, which could approach 57.8 mL H 2 O ·kg MOF –1 ·h –1 of water productivity at 20% RH and 25 °C .…”

“…29 When used as an AWH material, it can effectively promote water absorption and evaporation due to the abundant −OH and −COOH groups within it. 2 For example, Wu successfully prepared MXene-doped UiO-66-NH 2 composites inside the SA with three-dimensional network structure as AWH adsorbents, which could approach 57.8 mL Hd 2 O •kg MOF −1 •h −1 of water productivity at 20% RH and 25 °C. 30 Min succeeded in obtaining a novel adsorbent of graphene oxide doped SA hydrogel, which can achieve a water uptake of 0.18 kg device −1 •h −1 at 80% RH and 25 °C.…”