Design And Research Of Biomass Carbon Material Used In Interfacial Photothermal Evaporation Devices

Biomass carbon has advantages of abundant source,simple preparation and low cost,where natural porous structure promotes light absorption and water transport during photothermal evaporation.However,there has been less research on the application of porous biomass carbon in the interfacial photothermal evaporation.The relevant preferred conditions of biomass carbon and influences of factors are still unclear.In this paper,the biomass carbon and its devices made from nine common biomass are studied,and the interfacial photothermal evaporation experiment and related characterization are carried out,the preferred conditions of biomass carbon are summarized,and the high-performance biomass carbon is selected and analyzed in depth,the influences of various factors on their evaporation performance are explored,and their desalination abilities of artificial seawater are analyzed.The main research content and conclusions are as follows:(1)The interfacial photothermal evaporation process,light absorption and thermal utilization of porous biomass carbon are theoretically analyzed.The evaluation parameters of the interfacial photothermal evaporative device such as the evaporation rate,photothermal utilization efficiency,stability and desalination ability are clearly defined based on porous biomass carbon,which have a theoretical guidance in conducting experiments.(2)The nine common biomass are carbonized and aeesmbled into decices,and their characterization and interfacial photothermal evaporation experiments are carried out.The experiments show that,interfacial photothermal evaporation can achieve better evaporation performance with advanced thermal limits.Most of the biomass carbon devices show a certain evaporation performance which have a evaporation rate higher than 0.6 kg/(m~2·h).Preferred conditions for biomass carbon include good hydrophilic,continuous cross-sectional pores,and surfaces for gaseous water escaping.High-performance carbonized durian shell and passion peel are filtered,which prepares for future research in depth.(3)The filtered high-performance carbonized durian shell is carried out in-depth research.The effect of its special spinal surface on interfacial photothermal evaporation performance is investigated,and the influences of graphene oxide(GO),weak light on evaporation performance and the desalination ability of artificial seawater are analyzed.The experiments show that,under one standard sun,the carbonized durian shell has the best performance,and the evaporation rate and photothermal utilization efficiency are 1.25kg/(m~2·h),87.6%,respectively,which may be due to its special spinal surface promoting light absorption and evaporation area.The mass increase in GO coating reduces the photothermal evaporation performance of the devices,and when the GO coating mass is 0.7 mg,the evaporation rate and photothermal utilization efficiency are reduced to 0.87 kg/(m~2·h),61.1%,respectively.Its photothermal utilization efficiency can still reach more than 75%even under 0.4 X weak light condition,and the increase in light intensity rapids evaporation rate,but the growth of photothermal utilization efficiency is slow.Its desalination rate towards artificial seawater with a salinity of 3 wt%is 99.8%,the water after desalination meets the standard of drinking water stipulated in the World Health Organization.(4)The filtered high-performance carbonized passion peel is carried out in-depth research.The effect of its micro-double complex pores on interfacial photothermal evaporation performance is investigated,and the influences of light intensity,salinity on evaporation performance and the desalination ability of artificial seawater are analyzed.The experiments show,carbonized passion peel has a complex bilateral porous structure,A layer has dense small pores,and B layer has slotted large pores.Under one standard sun,carbonized passion peel(BA)achieves 1.27 kg/(m~2·h)of high evaporation rate and 88.6%of high photothermal utilization efficiency,which may be due to its micropores promoting water transmission rates.The increase in light intensity significantly improves the temperature and evaporation rate of carbonized passion peel(BA),but the growth of photothermal utilization efficiency is slow.The increase of salinity reduces its evaporation rate and the photothermal utilization efficiency.After 6 cycles of artificial seawater with a salinity of 3 wt%,its evaporation rate is basically stable,exhibiting strong resistance to salt contamination.Its desalination rates towards artificial seawater with a salinity of 3 wt%and 10 wt%are both higher than 99.5%,the water after desalination meets the standard of drinking water stipulated in the World Health Organization.