摘要
以间苯二酚、间苯三酚、甲醛、氯化镧、TiO_(2)纳米粒子为原料,草酸为催化剂,制备湿凝胶,再经恒温干化、N_(2)高温煅烧制备了一系列光催化复合材料CX-TiO_(2)-La(x)(x为La掺杂量的100倍,La掺杂量以TiO_(2)、甲醛、间苯二酚和间苯三酚的总物质的量为基准,取值为0.05、0.5和8),将其用于可见光下处理模拟土壤淋洗废水(即曲拉通100增溶的菲)。通过XRD、SEM、N_(2)吸附-脱附、FTIR对其进行了表征。结果表明,该复合材料的晶体组成主要为无定形碳、金红石型TiO_(2)和La_(2)Ti_(2)O_(7)。CX-TiO_(2)-La(0.5)的比表面积为549.35 m^(2)/g,暗态吸附30 min,500 W氙灯照射5 h下,其对曲拉通100(质量浓度为5 g/L)增溶的菲(质量浓度为100 mg/L)的移除率为83.6%。复合材料增溶菲的吸附过程符合准二级动力学模型和Langmuir模型,且为自发的化学吸附过程。推测材料内部形成了La_(2)Ti_(2)O_(7)-CX-TiO_(2)异质结结构扩大了TiO_(2)的光催化响应范围,使其在可见光下获得高的光催化降解效率,经8次循环使用后,CX-TiO_(2)-La(0.5)仍对增溶菲有较高的移除率。
A series of composites CX-TiO_(2)-La(x)(x is 100 times La doping amount,and the La doping amount is based on the total substance amount of TiO_(2),formaldehyde,resorcinol and phloroglucinol,the values are 0.05,0.5 and 8) were prepared from solid solution gel,an intermediate formed by resorcinol,phloroglucinol,formaldehyde,lanthanum chloride and TiO_(2)nanoparticles using oxalic acid as catalyst,through constant temperature drying and high temperature calcination in N_(2)atmosphere.Characterization by XRD,SEM,N_(2)adsorption-desorption and FTIR showed that the composites were mainly composed of amorphous carbon,rutile TiO_(2)and La_(2)Ti_(2)O_(7).Analysis by N_(2)adsorption-desorption indicated that the specific surface area of CX-TiO_(2)-La(0.5) reached 549.35 m^(2)/g.When used to treat simulated soil leaching(solubilization) wastewater,which is 100 mg/L (mass concentration) phenanthrene by solubilized with Triteron 100 (5 g/L),under visible light,CX-TiO_(2)-La(0.5) demonstrated a removal rate of 83.6%.Kinetic model analyses proved that the adsorption process of phenanthrene was basically a spontaneous chemical adsorption process and in accordance with the second-order kinetic model and Langmuir model.It was speculated that the La_(2)Ti_(2)O_(7)-CX-TiO_(2)heterojunction structure was formed,which expanded the correspondingly photocatalytic range of TiO_(2)and made it obtain high photocatalytic degradation efficiency under visible light.After 8 cycles of use,CX-TiO_(2)-La(0.5) still maintained a high removal rate of solubilized phenanthrene.
作者
杨春蕾
陆晓慧
刘新杰
琚成功
王爱静
彭啸
吴燕
YANG Chunlei;LU Xiaohui;LIU Xinjie;JU Chenggong;WANG Aijing;PENG Xiao;WU Yan(College of Chemical Engineering and Materials Science,Tianjin University of Science&Technology,Tianjin 300457,China;Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-Utilization,Tianjin 300457,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2022年第6期1234-1241,共8页
Fine Chemicals
基金
国家自然科学基金(21806122)。
关键词
钛酸镧
碳干凝胶
二氧化钛
多环芳烃
表面活性剂
催化
降解
水处理技术
lanthanum titanate
carbon xerogel
titanium dioxide
polycyclic aromatic hydrocarbons
surfactants
catalysis
degradation
water treatment technology
作者简介
杨春蕾(1992-),女,硕士生,E-mail:2624522118@qq.com;联系人:彭啸(1986-),男,副教授,E-mail:pengxiao@tust.edu.cn;联系人:吴燕(1976-),女,教授,E-mail:wuyan_tust@163.com。
