光合细菌-纳米二氧化钛制氢体系产氢机制及协同作用研究

Hydrogen production by photosynthetic bacteria was considered to be one of the most promising hydrogen production methods. However, photo hydrogen production is still facing low solar energy utilization rate and the problem of hydrogen production efficiency is much lower than the theoretical value.It was found that nano-Titania could significantly enhanced photo fermentative hydrogen production with. However there was no study on the mechanism as we known. In this project the hydrogen production principle and the synergistic effect of photosynthetic bacteria - nanometer titanium dioxide hydrogen production system was investigated. The hydrogen production model was studied based on the analysis of photocatalyst mechanism and photo fermentation mechanism. Then the synergistic effect was researched. The mechanism for nano-Titania enhancing photo fermentative hydrogen production with PSB was obtained. Finally, the influencing factors were also studied.The project has practical significance on improving the solar energy utilization rate of PSB,increasing hydrogen production efficiency, enhancing the photosynthetic bacteria stability and reduce the cost of photo hyrogen production. Also, it has a guiding significance for the development of new high efficient photosynthetic hydrogen production system.

光合细菌制氢被认为是目前最具发展潜力的制氢方法之一。然而光合产氢目前仍面临太阳能利用率不高，产氢效率远低于理论值等问题。有研究发现二氧化钛与光合细菌同时存在时，产氢量具有显著增加。但目前尚未有关于此机理的研究。本项目主要对光合细菌—纳米二氧化钛制氢体系产氢原理及协同作用机制进行了研究。在分析光合细菌光催化机制及光发酵机制的基础上，确定光合细菌—纳米二氧化钛体系产氢模型。通过对制氢体系中存在的协同机制进行了研究，得出纳米二氧化钛促进光合细菌产氢的机理。同时本项目对体系产氢各影响因素的权重进行了研究。本项目的研究对提高光合细菌太阳能利用率、产氢效率、光合细菌产氢稳定性及降低光合细菌产氢成本具有现实意义，同时对新型高效光合细菌产氢系统的研制与开发，具有指导意义。

光合细菌制氢是氢能开发研究热点之一。目前为止研究者在利用光合细菌产氢的理论和技术方面取得了很大进展，但光合细菌产氢仍面临太阳能利用率不高，产氢效率远低于理论值等问题。本项目主要研究了光合细菌-纳米二氧化钛制氢体系中纳米二氧化钛促进光合细菌光合产氢机理，明确了光合细菌—纳米二氧化钛制氢体系对不同产氢底物光合产氢的主要产氢途径，获得了纳米二氧化钛影响光合细菌利用不同产氢底物光合产氢的主要机制，确定了各影响因素对光合细菌—纳米二氧化钛制氢体系光合产氢的作用。本项目研究发现光合细菌—纳米二氧化钛制氢体系利用有机废水产氢，主要氢气来源为有机物，产氢量的增加并不是由于纳米二氧化钛光解水产生的；纳米二氧化钛有利于促进大分子蛋白质、多糖等分解为小分子物质，从而促进了光合细菌对产氢底物的利用；纳米TiO2提高了光合细菌的固氮酶活性，降低了光合细菌吸氢酶活性，促进了光合细菌的生长，同时纳米TiO2有利于提高光合细菌产氢中电子传递从而有利于提高光合细菌产氢能力。