共查询到18条相似文献,搜索用时 156 毫秒
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对光合细菌生物膜制氢反应器的挂膜启动特性以及成膜稳定后的反应器产氢性能进行了实验研究,探讨了光合细菌生物膜制氰反应器挂膜期间产氢及底物降解规律及稳定成膜后底物浓度对反应器产氢性能的影响.实验结果表明:在生物膜光生物反应器挂膜初期,随着微生物浓度的增大使循环液吸光度、底物消耗和反应器氢气产量迅速升高,进入膜生长期后由于主要是可逆吸附,各参数出现波动,最后在膜稳定期各参数趋于稳定.在稳定成膜后,随着底物浓度的增加,生物膜光生物反应器产氢率先增加,然后降低,存在一个最佳产氢率的底物浓度. 相似文献
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固定化光合细菌光生物制氢填充床产氢特性研究 总被引:3,自引:0,他引:3
实验研究了凝胶材料制备的光合细菌包埋颗粒构成的光生物制氢填充床在连续操作条件下底物浓度、光照强度以及进口流量等参数影响下的产氢和降解有机物的性能.实验结果表明:填充床产氢速率和底物降解速率随进口葡萄糖浓度的增加而增大,且达到最佳的进口底物浓度后填充床产氢和底物降解速率呈下降趋势,表明光合细菌代谢底物为产氢提供还原力氢;光照强度低于光能饱和度时,随着光照强度的增大,产氢速率和底物降解速率呈递增趋势,光照强度超过光能饱和度则对填充床光合产氢和底物消耗产生明显抑制作用;进口流量较低时,随进口流量的增大,填充床产氢和底物降解速率明显增大,进口流量较高时,填充床产氢和底物降解速率趋于相对稳定. 相似文献
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为实现光合细菌(PSB)产氢过程的光分频利用,用六硼化镧(LaB_6)和壳聚糖制备了光热转换发光发热生物材料,研究了不同LaB_6纳米颗粒的生物材料在可见光下的吸光特性和光热转换特性。研究发现:该生物材料能较好地透过510~650 nm波长的光为PSB产氢供给光能,而其他波段的光用于激发LaB_6粒子产热为PSB提供热能。LaB_6纳米颗粒的吸光度及光热转换能力受颗粒尺寸影响显著,当生物材料中LaB_6颗粒平均水力直径为295 nm时,12 min内的温升速率为0.41℃/min,是载玻片的5.4倍。 相似文献
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Role of graphene in improving catalytic behaviors of AuNPs/MoS2/Gr/Ni-F structure in hydrogen evolution reaction 下载免费PDF全文
Xian-Wu Xiu 《中国物理 B》2021,30(8):88801-088801
The efficient production of hydrogen through electrocatalytic decomposition of water has broad prospects in modern energy equipment. However, the catalytic efficiency and durability of hydrogen evolution catalyst are still very deficient, which need to be further explored. Here in this work, we prove that introducing a graphene layer (Gr) between the molybdenum disulfide and nickel foam (Ni-F) substrate can greatly improve the catalytic performance of the hybrid. Owing to the excitation of local surface plasmon resonance (LSPR) of gold nanoparticles (NPs), the electrocatalytic hydrogen releasing activity of the MoS2/Gr/Ni-F heterostructure is greatly improved. This results in a significant increase in the current density of AuNPs/MoS2/Gr/Ni-F composite material under light irradiation and in the dark at 0.2 V (versus reversible hydrogen electrode (RHE)), which is much better than in MoS2/Gr/Ni-F composite materials. The enhancement of hydrogen release can be attributed to the injection of hot electrons into MoS2/Gr/Ni-F by AuNPs, which will improve the electron density of MoS2/Gr/Ni-F, promote the reduction of H2O, and further reduce the activation energy of the electrocatalyst hydrogen evolution reaction (HER). We also prove that the introduction of graphene can improve its stability in acidic catalytic environments. This work provides a new way of designing efficient water splitting system. 相似文献
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Duliang He Mindong Chen Fei Teng Guiqing Li Huaxia Shi Jun Wang Mengjiao Xu Tianyun Lu Xuequn Ji Yingjie Lv Yongfa Zhu 《Superlattices and Microstructures》2012
CdS nanoparticles were in situ deposited on TiO2 nanosheets and nanorods under hydrothermal conditions, respectively. The effect of CdS–TiO2 interface structure on hydrogen production activity was mainly investigated under visible light irradiation. The results showed that the TiO2 nanosheet-based CdS/TiO2 showed a higher activity and a higher cyclability than the nanorod-based sample due to the stronger interaction of CdS with the (0 0 1) facets of TiO2 than with the (1 0 1) facets. It was proposed that the strong interaction between CdS nanoparticles and TiO2 nanosheets effectively refrains the recombination of electrons and holes. 相似文献
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The study of the viability of hydrogen production as a sustainable energy source is a current challenge, to satisfy the great world energy demand. There are several techniques to produce hydrogen, either mature or under development. The election of the hydrogen production method will have a high impact on practical sustainability of the hydrogen economy. An important profile for the viability of a process is the calculation of energy and exergy efficiencies, as well as their overall integration into the circular economy. To carry out theoretical energy and exergy analyses we have estimated proposed hydrogen production using different software (DWSIM and MATLAB) and reference conditions. The analysis consolidates methane reforming or auto-thermal reforming as the viable technologies at the present state of the art, with reasonable energy and exergy efficiencies, but pending on the impact of environmental constraints as CO2 emission countermeasures. However, natural gas or electrolysis show very promising results, and should be advanced in their technological and maturity scaling. Electrolysis shows a very good exergy efficiency due to the fact that electricity itself is a high exergy source. Pyrolysis exergy loses are mostly in the form of solid carbon material, which has a very high integration potential into the hydrogen economy. 相似文献
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T. M. James M. Schlsser S. Fischer M. Sturm B. Bornschein R. J. Lewis H. H. Telle 《Journal of Raman spectroscopy : JRS》2013,44(6):857-865
The Raman depolarization ratios for individual Q1(J”) branch lines of all diatomic hydrogen isotopologues – H2, HD, D2, HT, DT, and T2 – were measured, for all rotational levels with population larger than 1/100 relative to the Boltzmann maximum at room temperature. For these measurements, the experimental setup normally used for the monitoring of the tritiated hydrogen molecules at KArlsruhe TRItium Neutrino experiment was adapted to optimally control the excitation laser power and polarization, and to precisely define the Raman light collection geometry. The measured Raman depolarization values were compared to theoretical values, which are linked to polarizability tensor quantities. For this, the ‘raw data’ were corrected taking into account distinct aspects affecting Raman depolarization data, including (1) excitation polarization impurities; (2) extended Raman excitation volumes; and (3) Raman light collection over finite solid angles. Our corrected depolarization ratios of the hydrogen isotopologues agree with the theoretical values (based on ab initio quantum calculations by R.J. LeRoy, University of Waterloo, Canada) to better than 5% for nearly all of the measured Q1(J”) lines, with 1σ confidence level. The results demonstrate that reliable, accurate Raman depolarization ratios can be extracted from experimental measurements, which may be substantially distorted by excitation polarization impurities and by geometrical effects. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献