Simultaneous Photo Catalysis of SiC/Fe O Nano-particles and Photo-fermentation of 3 4 Rhodopseudomonas sp. nov. Strain A7 for Enhancing Hydrogen Production under Visible Light Irradiation

Abstract

To improve hydrogen production of photo-fermentation, synthetic SiC/Fe O nanoparticles with photocatalytic ability were added into the 3 4 culture system of Rhodopseudomonas sp. strain A7. Results indicated that the hydrogen production was remarkably enhanced with the addition of 100 mg/L SiC/Fe O nanoparticles. The maximum volume and yield of hydrogen achieved 2474 mL/L-culture and 3.02 mol 3 4 /mol-acetate, respectively. It was worth noting that photocatalysis and photo-fermentation were first realized simultaneously for hydrogen production with the SiC/Fe O nanoparticles. The mechanism of enhancement for producing hydrogen was also investigated. The bacterial 3 4 aggregation performance was improved by the added SiC/Fe O nanoparticles. The activity of nitrogenase could be promoted while the 3 4 activity of uptake hydrogenase could be inhibited. Beyond that, electron transfer behavior had taken place between strain A7 and nanoparticles. The electron transfer rate of the hydrogen production system could be promoted and accelerated by photo-generated electrons from SiC/Fe O nanoparticles. Hence, the hydrogen production ability and conversion efficiency of substrate were enhanced. The 3 4 photocatalytic combining photo-fermentation is promising way for hydrogen production.

Stimuli responsive multicolour fluorescence emission in carbon nanodots and application in metal free hydrogen evolution from water

“…[35][36][37] Photobiocatalysis techniques which combines photocatalytic process and photobiological technologies, have also been found effective for hydrogen evolution reaction with high efficiency. 38 Photoelectrochemical (PEC) hydrogen evolution through water splitting provides an useful way to obtain renewable hydrogen and already several successful attempts have been made using this approach. [39][40][41][42] Evolution of hydrogen from water using hybrid materials in combination with carbon dots [43][44][45] have been reported.…”

A Strategy to Develop Efficient Ag3PO4‐based Photocatalytic Materials Toward Water Splitting: Perspectives and Challenges

“…[18] It is worth noting that the PV-PEC system is not associated with any of the drawbacks, as stated above, and is the most approachable method for largescale hydrogen generation. [19] However, the complicated route of coupling photovoltaic solar cells with electrolytic water splitting materials makes it a cost-ineffective process. [20] Therefore, the splitting of water via an efficient photocatalyst has garnered fascination among research groups for over 40 years as a sustainable and clean practical technique.…”

“…(i) absorption in a wide range of solar spectrum bandgap must be below 3.0 eV, (ii) photo corrosion of thermodynamically active semiconductor in water, (iii) difficulty in choosing appropriate bandgap energies to produce the H 2 and O 2 [18] . It is worth noting that the PV‐PEC system is not associated with any of the drawbacks, as stated above, and is the most approachable method for large‐scale hydrogen generation [19] . However, the complicated route of coupling photovoltaic solar cells with electrolytic water splitting materials makes it a cost‐ineffective process [20] .…”

Study on the hydrogen production ability of high-efficiency bacteria and synergistic fermentation of maize straw by a combination of strains

“…The preparation and experimental operation of the three kinds of pure strain culture media were carried out by the improved Hungate anaerobic tube technique. [17][18][19] High purity nitrogen was the gas phase and conventional culturing was carried out at 35 C. The liquid medium was composed of glucose 10.0 mL, peptone 4.0 mL, yeast juice 1.0 mL, MgCl 2 0.15 mL, FeSO 4 0.15 mL, NaCl 1.0 mL, K 2 HPO 4 1.5 mL, beef extract 2.0 mL, L-cysteine 0.5 mL, vitamin and trace element liquids 10 mL, resazurin 0.25 mL, distilled water 1000 mL and medium sterilized at 121 C for 20 min. 20,21 2.2 The source and pre-treatment of maize straw Maize straw was obtained from a farm in Harbin, Shuangcheng province.…”