摘要
采用天然凹凸棒土在紫外光照射下降解亚甲基蓝溶液,探究其光催化性并优化。利用XPS和UV-Vis等方法对天然凹凸棒土官能团结构进行表征,进而以亚甲基蓝溶液的脱色率为响应值,在单因素实验的基础上,基于响应曲面法进一步探讨天然凹凸棒土光催化性影响因子,确定最佳实验条件。实验结果表明,天然凹凸棒土表面存在少量六配位非骨架Ti及锐钛矿型TiO2,光催化性能显著。单因素初始浓度和投加量,二次项投加量,交互作用项初始浓度和投加量对亚甲基蓝溶液脱色率的影响极显著。模型预测的最佳工艺参数:初始浓度18.90 g/mL,光催化时间16.55 min,投加量0.04 g,脱色率达最大为98.95%。
Natural attapulgite was used to decrease the solution of methylene blue under ultraviolet irradiation to explore its photocatalysis and optimize.The functional group structure of natural attapulgite was characterized by XPS and UV-Vis,and then the decolorization rate of methylene blue solution was taken as the response value.Based on the single-factor experiment,the response surface method was used to further explore the photocatalytic influencing factors of natural attapulgite and determine the best experimental conditions.The experimental results showed that there was a small amount of 6-coordination Ti and anatase TiO2 on the surface of natural attapulgite,and the photocatalytic performance was significant.Single factor initial concentration and addition amount,secondary term addition amount,interaction term initial concentration and addition amount had significant effect on decolorization rate of methylene blue solution.The optimal process parameters predicted by the model were as follows:initial concentration 18.90 g/mL,photocatalytic time 16.55 min,dosage 0.04 g and decolorization rate up to 98.95%.
作者
张建民
刘宇琦
李红玑
李克莉
ZHANG Jianmin;LIU Yuqi;Li Hongji;LI Keli(College of Town Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2020年第6期6158-6163,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(21573171)
陕西省重点研发计划资助项目(2017GY-121)
陕西省教育厅自然科学专项基金资助项目(17JK0327)
西安工程大学博士科研启动基金资助项目(BS201932)
国家级大学生创新创业训练资助项目(201910709028)。
关键词
天然凹凸棒土
光催化性
亚甲基蓝溶液
响应曲面法
二氧化钛
natural attapulgite
photocatalytic property
methylene blue solution
response surface method
titanium dioxide
