Preparation of attapulgite/agar composite aerogel and the solar interfacial evaporation properties
Solar interfacial evaporation is an emerging and sustainable method for seawater desalination and wastewater purification,which has great potential to alleviate freshwater shortages.Attapulgite/agar composite aerogel(AACA)was prepared from attapulgite and agar by physical mixing,freeze-drying and crosslinking.AACA had hierarchical porous structure,excellent thermal insulation and super hydrophilicity.In order to improve the light absorption ability of the material,the photothermal conversion material PPy-AACA was prepared by polypyrrole(PPy)spraying on the surface of AACA and its average light absorption rate could reach 97.7%in the range of 250-2500nm.Using PPy-AACA as a solar interfacial evaporator under the illumination intensity of 1 sun(1kW/m2),the evaporation rate of PPy-AACA was 1.5012kg/(m2·h),the energy conversion efficiency was 88.76%.PPy-AACA showed excellent stability and salt resistance in cyclic evaporation and brine evaporation experiments.In addition,the photothermal conversion material had also demonstrated the ability of seawater desalination and purification of dye wastewater,and the retention rate of salt ions and organic dyes was greater than 99%.
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