Photocatalytic Hydrogen Production Performance of Oxygen-containing Vacancy-deficient Bismuth Tungstate
The novel semiconductor photocatalyst bismuth tungstate is a widely researched photocatalyst,but its photocatalytic hydrogen-producing performance is limited by the problem that its electron-hole pairs are easy to be compounded.To solve this problem,lithium-ethylenediamine solution was used to construct controllable oxygen vacancy defects on the surface of bismuth tungstate.The changes of bismuth tungstate before and after lithium-ethylenediamine treatment were compared by material characterization,and both were tested for hydrogen production performance.Bismuth tungstate produced oxygen vacancy defects after lithium-ethylenediamine treatment,and the color of the material changed from the original yellowish-white to yellowish-brown,which enhanced the light-absorbing ability.The main structure of the particles and the composition of the material did not change,and the spherical particle structure was still maintained,but the original smooth lamellar structure on the surface of the bismuth tungstate particles became rough after the treatment,and the sharp edges of the square nanosheets became smooth,which improved the photocatalytic reaction area.These changes resulted in a certain enhancement of the photocatalytic hydrogen production performance of lithium-ethylenediamine-treated bismuth tungstate compared with that before the untreated treatment,in which the bismuth tungstate with a treatment time of 2 min showed the highest average hydrogen production rate of 21 μmol·g-1·h-1.Compared with the untreated bismuth tungstate,the average hydrogen production rate of 15 μmol·g-1·h-1 was improved by 40％,which has better photocatalytic hydrogen production performance.
photocatalysisbismuth tungstateoxygen vacanciessurface defectshydrogen production
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