A strong interfacial contact of heterostructured photocatalysts plays a key role in charges migration, thus promoting photocatalytic performance. Benefiting from the unique two-dimensional (2D) morphology and abundant terminals, 2D/2D “face-to-face” WO3·H2O/g-C3N4 heterostructured self-assemblies were fabricated employing tungsten oxide hydrate (WO3·H2O) nanoplates and graphitic carbon nitride (g-C3N4) sheets as precursors. Compared to pristine WO3·H2O and g-C3N4, the binary WO3·H2O/g-C3N4 heterostructures exhibit excellent photocatalytic performance towards water decontamination, using organic dye rhodamine B/methyl orange as probes. It is found that WO3·H2O/g-C3N4 with 20 wt% mass ratio (WHC-20) possesses the best photocatalytic activities, with about 3.05 times higher than that of pristine g-C3N4. The remarkable increase performance is attributed to the enhanced evolution of superoxide radicals (·O2−) via photoreduction in adsorbed oxygen molecules (O2−), which are promoted by efficient Z-scheme charges separation and rapid electrons transfer at 2D/2D interface. Given the low-cost, facile synthetic procedure and recycling stability, the heterostructured WO3·H2O/g-C3N4 could be served as a promising photocatalyst to deal with water contamination.

中文翻译：

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2D/2D WO3·H2O/g-C3N4异质结构组件通过强界面接触增强光催化水净化

异质结构光催化剂的强界面接触在电荷迁移中起关键作用，从而提高光催化性能。受益于独特的二维 (2D) 形态和丰富的终端, 使用氧化钨 (WO3·H2O) 纳米片和石墨制造了二维/二维“面对面”WO3·H2O/g-C3N4 异质结构自组装氮化碳 (g-C3N4) 片材作为前体。与原始的 WO3·H2O 和 g-C3N4 相比，使用有机染料罗丹明 B/甲基橙作为探针，二元 WO3·H2O/g-C3N4 异质结构对水净化表现出优异的光催化性能。结果表明，质量比为20wt%的WO3·H2O/g-C3N4（WHC-20）具有最好的光催化活性，比原始g-C3N4高约3.05倍。显着的提高性能归因于通过吸附氧分子 (O2-) 中的光还原作用增强超氧自由基 (·O2-) 的演化，这是通过有效的 Z 型电荷分离和 2D/2D 界面处的快速电子转移促进的。鉴于低成本、简便的合成过程和循环稳定性，异质结构的 WO3·H2O/g-C3N4 可作为一种有前途的光催化剂来处理水污染。