Design And Performance Research Of Bamboo-derived Carbon-based Water Evaporator

In recent years,the scarcity of water resources is becoming more and more serious.It is necessary to develop a low energy consumption and environmental protection method for freshwater production when the existing methods generally have high energy consumption and environmental problems.As a new technology developed in these years,solar interface water evaporation is regarded as an advanced method of freshwater production with low cost,low infrastructure dependence and environmental protection.However,there are still problems that restrict this method in practice,such as inhibition of evaporation performance by surface salt crystallization and insufficient energy utilization in the system.Therefore,it is urgent to develop multi-functional evaporators to solve the problems.In this study,the structure design is guided by computer simulation,and a new type of evaporator was prepared by the reasonable design of biomass-derived carbon and hydrogen composite materials,which realized the versatility of the solar interface water evaporator.The specific research content of this paper is as follows:（1）A vertical light absorption structure is designed by computer light path simulation to achieve efficient light absorption.Specifically,bamboo leaf-derived carbon is used as photothermal material,arranged according to the structure,and then filled with hydrogel to form a vertical and continuous water transport structure.The prepared evaporator integrates light absorption,photothermal conversion,and water transport,and exhibits excellent water evaporation performance with an evaporation rate of 1.75 kg m^-2 h^-1.At the same time,due to its efficient water transport,the evaporation rate of the evaporator remains stable under 24-h continuous light,and there are no obvious salt crystals on the surface.In this paper,the evaporator with a vertical array has excellent water evaporation performance,comprehensive water treatment property,and long-term salt resistance and has promise application prospects.（2）Using Computational Fluid Dynamics simulation,an asymmetric structure is designed.The water transport material and photothermal material required by the evaporator are prepared by compounding hydrogel with natural bamboo fiber and carbonized bamboo fiber,and these two materials are further combined asymmetrically to form an asymmetric evaporator.Due to the rational size and structure design,the evaporator displays an excellent evaporation rate of 1.79 kg m^-2 h^-1and great comprehensive water treatment performance.In addition,the unique structural design enables the evaporator to produce salt asymmetrically and generate power while evaporating water.Thus,we prepare a multi-functional evaporator which provides a reference for the design and implementation of multi-functional and high-performance solar interface evaporators in the future,which has important guiding significance.