Luyao Wang,Qiaoyue Chen,Bingchen Zeng,Yuting Shi,YiLinna YiLi,Chengli Yang,Dali Li
Laccase has a wide range of substrates and the oxidation product is water, providing an ideal choice for the biological degradation and decolorization of dyeing wastewater. This study extracted laccase from the fruiting body of Agaricus bisporus, then used o-phthalaldehyde (OPA) as a cross-linking agent and added surface-aminated Fe3O4 nanoparticles (NH2-nanoFe3O4) to prepare magnetic cross-link enzyme aggregates (MCLEAs) of laccase, which was characterized by scanning electron microscope and vibrating sample magnetometer. The optimal temperature for the catalytic reaction of the MCLEAs was 35 °C, and the optimal pH was 3.0. The stability to temperature pH and storage stability were all enhanced. The immobilized laccase was utilized to treat amido black 10B solution, and the decolorization rate reached 92.48%. After five cycles of use, the MCLEAs of laccase could maintain 42.91% of the relative activity and 32.31% of the relative degradation ability to amido black 10B.
Xueting Zhao,Youyou Lan,Tingyuan Wang,Yuanyuan Jiang,Jiefeng Pan
The emerging solar steam generation technology enables an alternative water purification strategy, which shows great potential for alleviating the global energy and water crisis. The elaborate designs of interfacial photothermal materials play important roles in promoting solar steam generation. Herein, novel photothermal membranes with tailored hierarchical cactus-like microsphere networks are fabricated via multiple polyphenol-mediated complexation. The hierarchical cactus-like microsphere network exhibits bi-continuous, superwetting and photothermal functional features, which play critical roles in balancing solar-to-thermal and water-to-steam conversion. The tightly distributed hierarchical cactus-like microspheres simultaneously trap sunlight inside the porous network, and thus promote localized solar-to-thermal conversion. The bi-continuous porous and superhydrophilic microsphere network provides efficient water-transport/vapor-escape channels and facilitates water-to-steam conversion. These features endow the photothermal membrane with a high evaporation rate of 1.83 kg m−2 h−1 and a solar-to-vapor conversion efficiency of 95.2% under one sun illumination. The photothermal membranes are also demonstrated to produce clean water by seawater desalination and wastewater decolorization. Moreover, the universality of the proposed strategy to engineer hierarchical cactus-like microsphere network membranes provides a scalable and flexible platform for promising solar-powered water purification application.
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