Abstract Nitrogen-doped reduced graphene oxide (NRG)/SnO2/SnS2 ternary photocatalyst was fabricated by hydrothermal methods in two steps. XRD, Raman, XPS, X-ray elemental mapping, TEM and HRTEM analyses verified the preparation of NRG/SnO2/SnS2 ternary nanocomposite. The photocurrent response, photoluminescence, electrochemical impedance and electron spin resonance measurements indicated that the three components had synergistic effects in decreasing the carrier recombination of NRG/SnO2/SnS2. For photocatalytic reduction of aqueous Cr(VI) under visible-light irradiation, the photocatalytic efficiency of NRG/SnO2/SnS2 was higher than those found for SnS2, binary composites (NRG/SnO2, NRG/SnS2 and SnO2/SnS2), and other reported ternary photocatalysts (g-C3N4/SnS2/SnO2, SnS2-BiFeO3/rGO, NRG/SnS2/PANI and SnS2/SnO2/CPVC). Moreover, NRG/SnO2/SnS2 also exhibited a high efficiency in photocatalytic treatment of the diluted black chromium electroplating solution. Based on the results of comparative photocatalytic experiments in N2 or air atmosphere, and with or without O2•– trapping agent (p-Benzoquinone), it was inferred that Cr(VI) was reduced dominantly by photogenerated electrons of NRG/SnO2/SnS2.

中文翻译：

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SnO2/SnS2 纳米复合材料锚定在氮掺杂的 RGO 上，用于改善水性 Cr(VI) 的光催化还原

摘要 采用水热法分两步制备氮掺杂还原氧化石墨烯（NRG）/SnO2/SnS2三元光催化剂。XRD、拉曼、XPS、X 射线元素映射、TEM 和 HRTEM 分析验证了 NRG/SnO2/SnS2 三元纳米复合材料的制备。光电流响应、光致发光、电化学阻抗和电子自旋共振测量表明，这三种组分在减少 NRG/SnO2/SnS2 的载流子复合方面具有协同作用。对于可见光照射下 Cr(VI) 水溶液的光催化还原，NRG/SnO2/SnS2 的光催化效率高于 SnS2、二元复合材料（NRG/SnO2、NRG/SnS2 和 SnO2/SnS2）等报道了三元光催化剂（g-C3N4/SnS2/SnO2、SnS2-BiFeO3/rGO、NRG/SnS2/PANI 和 SnS2/SnO2/CPVC）。而且，NRG/SnO2/SnS2 在稀释黑铬电镀液的光催化处理中也表现出很高的效率。根据在 N2 或空气气氛中，有或没有 O2•– 捕集剂（对苯醌）的对比光催化实验结果，推断 Cr(VI) 主要被 NRG/SnO2/SnS2 的光生电子还原。