摘要
利用绿茶萃取液(GTE)既作还原剂又作掩蔽剂,通过绿色还原合成纳米铁粒子(GT-FeNPs).通过SEM、XRD、FT-IR、BET等手段对GTE合成的纳米铁粒子的微观结构进行了表征和分析,结果表明GTE合成的纳米铁是无定形的球形颗粒,颗粒粒径在70～80 nm左右.并以孔雀绿(MG)为目标降解物,探讨GT-Fe NPs对孔雀绿的降解性能.在孔雀绿初始质量浓度为50 mg.L-1和初始溶液的pH=5.78的条件下反应10 min,GT-Fe NPs对孔雀绿的去除率高达75.66%,降解过程符合一级反应动力学.根据GT-Fe NPs对孔雀绿反应前后的表征结果和孔雀绿降解动力学的研究结果,降解机理可能包括MG吸附在GTE和GT-Fe NPs表面上,同时纳米铁在水的侵蚀作用下产生自由电子,与发色基团发生还原作用,达到脱色效果,并在自由电子的进一步攻击下,使得MG中连接苯环的碳碳双键断裂.
Green tea synthesized iron nanoparticles （GT-Fe NPs） were synthesized by green methods based on green tea extracts （GTE） and used to degrade malachite green （MG） in aqueous solution. The iron nanoparticles were characterized using SEM/EDS, XRD, FF-IR and BET tech- niques to confirm the formation of iron oxides. The results showed that the diameter of iron nanopar- ticles were about 70-80 nm, spherical and amorphous; 75.66% of MG was degraded after 10 rain with an initial MG concentration of 50 mg ~ L- 1 （ pH 5.78 ）. The degradation of MG by GT-Fe NPs was fit well first-order kinetic model. The degradation mechanism of MG by GT-Fe NPs included that iron nanoparticles produce free electron with the help of water erosion, which reduced chromo- phoric group of MG, then carbon bond fracture which connect with benzene ring in the further attack of free electron.
出处
《福建师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第4期65-72,共8页
Journal of Fujian Normal University：Natural Science Edition
基金
福建师范大学闽江学者人才建设项目(200604)
福建省教育厅资助项目(JB12007)
关键词
绿色合成
GT-Fe
NPS
MG
表征
去除
green synthesis
GT-Fe NPs
malachite green
characterization
degradation
