Structural characterization (Fig.S4)

XRD patterns (a)<b> </b>and FTIR spectra (b) of KCN with different amounts of KCl. Photocatalytic H₂O₂ generation as a function of molar ratio of KCl to melamine in the preparation of KCN (c). Comparison of photocatalytic H₂O₂ production of GCN modified with various alkali metal chloride, potassium halide (d). Reaction conditions: the photocatalyst suspension (0.5 g L^-1, pH 3 or phosphate buffer) with 10 vol% EtOH in a Pyrex glass reactor under visible light illumination (l ≥ 420 nm) for 1 h, T = 25 ^oC.

不同氯化钾添加量的KCN样品的X射线衍射（XRD）图谱(a)与傅里叶变换红外光谱（FTIR）(b)。KCN制备过程中，过氧化氢光催化生成量随氯化钾与三聚氰胺摩尔投料比的变化曲线(c)。不同碱金属氯化物、卤化钾改性石墨相氮化碳（GCN）的过氧化氢光催化产率对比结果(d)。反应条件如下：将浓度为0.5 g·L⁻¹、pH为3或采用磷酸盐缓冲液的光催化剂悬浮液与10%体积分数的乙醇（EtOH）加入派热克斯（Pyrex）玻璃反应器中，在波长λ≥420 nm的可见光照射下反应1 h，反应温度为25 ℃。