Enhanced photocatalytic activity of P-type (K, Fe) co-doped g-C3N4 synthesized in self-generated NH3 atmosphere
Enhanced photocatalytic activity of P-type (K, Fe) co-doped g-C3N4 synthesized in self-generated NH3 atmosphere
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DOI：
10.1016/j.apsusc.2018.10.234
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发表时间：
2019-03
影响因子：
6.7
通讯作者：
Wei Guo;Jiajun Zhang;Guoning Li;Chunjian Xu
中科院分区：
文献类型：
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作者：
Wei Guo;Jiajun Zhang;Guoning Li;Chunjian Xu
在自生NH3气氛下合成了P型（K，Fe）共掺杂g-C3 N4，并显示出较好的介电性能。对其理化性质进行了全面表征。还原性气氛，自生的NH3，强烈影响光催化性能，导致带的排列下移。掺杂K和Fe的g-C3 N4具有更高的结晶度、更丰富的孔隙结构、更高的比表面积、更低的能带排列和更窄的带隙，并具有增强的光吸收能力。此外，光电流响应和Mott-Schottky曲线表明，（K，Fe）共掺杂g-C3 N4为p型，具有增强的电流密度。最终，更高的比表面积、更高的光吸收能力、更低的复合速率和更多的光生载流子导致观察到更好的光催化性能。在罗丹明B溶液中的光催化活性评价可以很好地用零级动力学拟合。采用循环实验研究其稳定性。基于捕集实验研究了光催化机理，表明低EV和p型行为之间存在协同效应。
P-type (K, Fe) co-doped g-C3N4was synthesized under self-generated NH3atmosphere and displayed improved photocatalysis performances. Its physicochemical properties were comprehensively characterized. The reducing atmosphere, self-generated NH3, strongly affects photocatalytic performances, causing a downshift of the band alignments. Doping the g-C3N4with K and Fe creates a higher degree of crystallization, more abundant porosity structure with higher specific surface area, lower band alignments and narrower band gaps with enhanced light absorption ability. Moreover, the photocurrent response and Mott-Schottky plots show that the as-synthesized (K, Fe) co-doped g-C3N4is of p-type and has a boosted current density. Ultimately, the higher specific surface area, higher light absorbance capacity, lower recombination rate, and more photo-generated carriers lead to observed better photocatalytic performance. Photocatalytic activity evaluation in Rhodamine B solution could be well fitted by zero-order kinetic. Cycling experiments were employed to study the stability. Photocatalytic mechanism was investigated based on trapping experiments, suggesting a synergistic effect between low EVBand p-type behaviors.