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    Photothermal bio-based membrane via spectrum-tailoring and dual H-bonding networks strategies for seawater treatment and crude oil viscosity reduction

    Year: 2022

    Journal: Energy Conv. Manag., Volume 260, MAY 15

    Authors: Wei, Zechang; Cai, Chenyang; Fu, Yu

    Organizations: Na-tional Natural Science Foundation of China [31770608]; Jiangsu Specially-appointed Professorship Program [[2016] 20]; Science and Technology Innovation Project for Overseas Students of Nanjing City (Ningrenshehan) [[2018] 214]; Postgraduate Research &Practice Innovation Program of Jiangsu Province [KYCX19_1087]; Postgraduate Research & Practice Innovation Pro-gram of Jiangsu Province [KYCX21_0891]; Analytical and Testing Assistance from Analysis and Test Center of Nanjing Forestry University; National First-class Disciplines (PNFD); Priority Academic Program Develop-ment of Jiangsu Higher Education Institutions (PAPD)

    Keywords: Solar energy conversion; Bio-based membrane; Water treatment; Crude oil viscosity reduction; Carbon neutralization

    To reach global carbon neutralization, the use of clean energy and biomaterials has become a trend to reduce CO2 emission. With the increasing concerns about freshwater shortage and crude oil pollution, water purification and sewage treatment have become particularly urgent. Solar energy is an environment-friendly energy to mitigate freshwater shortage stress and reduce crude oil pollution. However, how to make solar energy applied to effectively drive freshwater generation and crude oil pollution remedy is crucial. Herein, the electrospun membrane was explored as sustainable matrix with desirable solar-to-thermal performance. The strategy of spectrum-tailoring was proposed to tailor bandgap energy of vanadium disulfide (VS2) for photothermal conversion promotion and interfacial evaporation efficiency. Inspired by mussel, dopamine was polymerized on surface of VS2 (VS2@PDA) for spectrum tailoring (Solar absorptance, alpha, is 89.34 %). Bandgap energy of the complex favorably decreased from 2.06 to 1.41 eV. Combining the dual H-bonding networks, water evaporation enthalpy of the membranes dramatically decreased from 2370 to 1990.2 J/g and the resulted evaporators showed excellent salt resistance, with evaporation rate of 1.40 kg m(-2)h(-1) (enhancement factor is 2.032) and extraordinary cyclic evaporation performance. Additionally, sunflower-inspired tilting model was architectured to eliminate disturbance of sun irradiation incident angles for effective solar-driven interfacial generation. The resulted membrane effectively treated the seawater and decreased high viscosity of the super-viscous crude oil under the sun irradiation, thus showing great potential in seawater treatment and crude oil pollution remedy. The designs maximized utilization of solar energy and evaporation rates by treating seawater and reducing crude oil pollution without consuming additional energy, thus contributing to carbon neutralization. Therefore, the integration of dual H-bonding networks and spectrum-tailoring strategies would facilitate the structure functional unification and desirable photothermal capabilities, and bring about an application potential in the development of composite evaporators for carbon neutralization.
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