| Agricultural waste such as corn stover is a renewable energy resource with great development potential.At the same time,hydrogen is a clean and promising energy carrier,is also regarded as the most ideal alternative to fossil fuels.Therefore,using agricultural waste to produce hydrogen is considered to be one of the effective ways to solve increasing energy consumption and environmental pollution.However,the steam reforming and pyrolysis gasification methods currently used in biomass hydrogen production have some problems such as large energy consumption and many by-products.Photo catalytic hydrogen production is a mild reaction process,which can store low density and unstable solar energy in the form of chemical energy.Combining photocatalytic reforming biomass with photocatalytic water splitting for produce hydrogen can realize the comprehensive utilization of three renewable energy including biomass energy,solar energy and hydrogen energy.In this paper,the reaction of photocatalytic hydrogen splitting with water produced by corn stover as a sacrificial agent is studied.In order to improve the yield of photocatalytic hydrogen production,the factors affecting photocatalytic hydrogen production are studied.The effect of pretreatment on the hydrogen production reaction of corn stover and the effect mechanism of pretreatment on the photocatalytic hydrogen production reaction were also studied.Firstly,Pt/TiO2 was selected as the catalyst to study various factors in the photocatalytic hydrogen production system with corn stover as the sacrificial agent.The structure,components and functional groups of corn stover after photocatalysis were analyzed.In the selected experimental range,the effects of various influencing factors on the photocatalytic hydrogen production were studied,and it was proved that corn stover can be used as a sacrificial agent to improve the hydrogen production of photocatalytic water splitting.When the stover particle concentration was 0.3×10-3 g/mL,the catalyst concentration was 5×10-3 g/mL,and the stover particle size was 380?250 ?m,the hydrogen production was 85.04 ?mol for 4 hours,which was about 50 times of photocatalytic pure water splitting.What's more,different stover positions,pH values,and inorganic salt types will have different effects on photocatalytic hydrogen production.Secondly,the alkali-treated corn stover was added to the Pt/TiO2 suspension.The pretreated corn stover could significantly increase the rate of hydrogen production from photocatalytic water splitting with corn stover as a sacrificial agent.Through the analysis of the change of corn stover before and after alkali treatment and photocatalytic reaction,it was found that changes in the structural components and surface functional groups of corn stover can affect the subsequent photocatalytic hydrogen production reaction.The effects of NaOH concentration,pretreatment time and pretreatment temperature on hydrogen production were studied by single factor and orthogonal experiments.The experimental results showed that when the NaOH concentration was 2%,the pretreatment temperature was 60? and the pretreatment time was 1 h,the hydrogen production reaches 103.364 ?mol.Finally,the corn stover was pretreated with the dilute acid solution.The experiment showed that the corn stover after dilute acid treatment showed inhibition of hydrogen produced under the experimental conditions.However,when the waste liquid of acid pretreated was used as a sacrificial agent,the hydrogen production increased significantly.When the added waste liquor was 3 ml,the hydrogen production reached 133.365 ?mol.The above conclusions provide some experimental basis for the experimental study of photocatalytic hydrogen production with pretreated corn stover as sacrificial agent.It has theoretical and practical significance for the utilization of natural biomass and hydrogen and solar energy. |
PDF Full Text Request