C3N4nano-sheet (C3N4-S) was synthesized by one-pot pyrolysis of mixture of melamine and NaCl. As for Knoevenagel condensation of benzaldehyde with malononitrile, C3N4-S exhibits much higher activity than that of NaCl-free C3N4. Characterization results indicate that the NaCl amount and pyrolysis temperature significantly influent the surface area and catalytic activity of C3N4-S. It is found that C3N4-S-550-0.863 affords 96.8% conversion of benzaldehyde and 100% selectivity of benzylidene malononitrile. Moreover, C3N4-S-550-0. 863 is recyclable and active even at 30 ℃.%以NaCl为添加剂、三聚氰胺为原料,一步热解法合成 C3N4纳米片( C3N4-S). 在苯甲醛与氰乙酸乙酯的Knoevenagel缩合反应中,C3N4-S的催化活性明显高于未添加NaCl的普通C3N4.表征发现:NaCl的添加量和焙烧温度能够显著影响C3N4-S的比表面积和催化活性.以C3N4-S-550-0. 863 为催化剂,在70 ℃下反应4 h,苯甲醛的转化率达到96. 8% ,α-氰基肉桂酸乙酯选择性为100% .最低反应温度可低至30 ℃,具有良好的可重复使用性能.
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