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首页> 外文期刊>RSC Advances >WS2/g-C3N4 composite as an efficient heterojunction photocatalyst for biocatalyzed artificial photosynthesis
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WS2/g-C3N4 composite as an efficient heterojunction photocatalyst for biocatalyzed artificial photosynthesis

机译：WS2 / g-C3N4复合材料作为生物催化人工光合作用的高效异质结光催化剂

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A heterogeneous WS _(2) /g-C _(3) N _(4) composite photocatalyst was prepared by a facile ultrasound-assisted hydrothermal method. The WS _(2) /g-C _(3) N _(4) composite was used for photocatalytic regeneration of NAD ~(+) to NADH, which were coupled with dehydrogenases for sustainable bioconversion of CO _(2) to methanol under visible light irradiation. Compared with pristine g-C _(3) N _(4) and the physical mixture of WS _(2) and g-C _(3) N _(4) , the fabricated WS _(2) /g-C _(3) N _(4) composite catalyst with 5 wt% of WS _(2) showed the highest activity for methanol synthesis. The methanol productivity reached 372.1 μmol h ~(?1) g _(cat) ~(?1) , which is approximately 7.5 times higher than that obtained using pure g-C _(3) N _(4) . For further application demonstration, the activity of the WS _(2) /g-C _(3) N _(4) composite catalyst toward photodegradation of Rhodamine B (RhB) was evaluated. RhB removal ratio approaching 100% was achieved in 1 hour by using the WS _(2) /g-C _(3) N _(4) composite catalyst with 5 wt% of WS _(2) , at an apparent degradation rate approximately 2.6 times higher than that of pure g-C _(3) N _(4) . Based on detailed investigations on physiochemical properties of the photocatalysts, the significantly enhanced reaction efficiency of the WS _(2) /g-C _(3) N _(4) composite was considered to be mainly benefiting from the formation of a heterojunction interface between WS _(2) and g-C _(3) N _(4) . Upon visible-light irradiation, the photo-induced electrons can transfer from the conduction band of g-C _(3) N _(4) to WS _(2) , thus recombination of electrons and holes was decreased and the photo-harvesting efficiency was enhanced.
机译：通过简便的超声辅助水热法制备了WS_（2）/ g-C_（3）N_（4）N_（4）复合光催化剂。 WS _（2）/ gC _（3）N _（4）复合材料用于NAD〜（+）向NADH的光催化再生，再与脱氢酶偶联以在可见光下将CO _（2）可持续地生物转化为甲醇。光照射。与原始gC _（3）N _（4）以及WS _（2）和gC _（3）N _（4）的物理混合物相比，制造的WS _（2）/ gC _（3）N _ （4）WS_（2）为5 wt％的复合催化剂显示出最高的甲醇合成活性。甲醇生产率达到372.1μmolh〜（？1）g _（cat）〜（？1），约为使用纯g-C _（3）N _（4）获得的7.5倍。为了进一步的应用演示，评估了WS _（2）/ g-C _（3）N _（4）复合催化剂对罗丹明B（RhB）光降解的活性。通过使用具有WS_（2）5 wt％的WS _（2）/ gC _（3）N _（4）复合催化剂，在1小时内达到了接近100％的RhB去除率，表观降解速率约为2.6比纯gC _（3）N _（4）高出三倍。基于对光催化剂理化性质的详细研究，认为WS _（2）/ gC _（3）N _（4）复合材料的反应效率显着提高，主要是由于WS之间的异质结界面的形成_（2）和gC _（3）N _（4）。在可见光照射下，光诱导电子可以从gC _（3）N _（4）的导带转移到WS _（2），因此电子和空穴的复合减少，光捕获效率为增强。

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