摘要
以氯化铜、磷酸二氢钠和尿素为原料,加入模板剂十二烷基硫酸钠(SDS),采用微波辅助加热法制备了具有不同规则结构的晶态羟基磷酸铜。实验研究了Cu Cl2与Na H2PO4的摩尔比、模板剂种类和原料浓度等因素对合成羟基磷酸铜晶体的影响。产物采用XRD、SEM和Raman等进行表征,并通过降解甲基蓝溶液(MB)测试了羟基磷酸铜的催化性能,探讨了制备条件对产物光催化降解性能的影响。结果表明,当n(Cu)/n(P)为2,[PO43-]=0.0025 mol/L,微波加热温度80℃,反应时间30 min,尿素用量6.0 g,SDS用量为0.10 g时制备的羟基磷酸铜具有良好的光催化效果。实验还测试了催化剂的表面光电压谱,并使用苯甲酸作为荧光探针,叔丁醇为羟基自由基捕获剂初步验证了光催化反应中羟基磷酸铜的催化机理。
Copper hydroxyphosphate（Cu2（OH）PO4） was quickly synthesized by microwave-assisted method at low temperature（ 100℃） and normal atmosphere pressure, then characterized by XRD, SEM and Raman spectra. The synthesis parameters were investigated by a series of controled experiments. It is found that molar ratio, initial concentration of Cu Cl2 and Na H2PO4, and surfactant species were crucial factors determining the formation and morphology of Cu2（OH）PO4. Cu2（OH）PO4 synthesized at different [PO43-]（n（Cu）/n（P）=2） exhibited a various morphologies including grain-like, prism and long-prismatic. Addition of anionic surfactant and sodium dodecyl sulfate（SDS） greatly affects Cu2（OH）PO4 final morphology. The photocatalytic degradation of Cu2（OH）PO4 on methylene blue（MB） was evaluated with addition of H2O2 under visible light irradiation. The results showed that Cu2（OH）PO4 synthesized at conditions when n（Cu）/n（P）=2, [PO43-]=0.0025 mol/L, 6.0 g urea and 0.10 g SDS, microwave heating at 80℃for 30 min exhibited best visible-light photo-degradation activity. The increase in HO· formation in the presence of Cu2（OH）PO4 and the inhibition of HO· generation by adding HO· scavengers（t-butanol） indicated that HO· generated in the reaction system was responsible for the enhanced MB decomposition. Cu2（OH）PO4 exhibited excellent stability and effectiveness after 5 consecutive runs in terms of photodegradation of MB.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第4期421-426,共6页
Journal of Inorganic Materials
基金
国家科技支撑计划项目(ID2012BAK30B03)
央高校基本科研业务费专项资金(2232013A3-05
CUSF-DH-D-2014036)~~
关键词
羟基磷酸铜
微波辅助法
低温常压
光催化性能
copper hydrophosphate
microwave-assisted method
low temperature and normal pressure
photocatalysis
