TiO_(2)/硅藻土/泥炭藓复合光催化调湿材料研究  

Study on TiO_(2)/Diatomite/Sphagnum Composite Photocatalytic Humidity-controlling Materials

作　　者：胡明玉[1] 周侠 李晔 谭煜秋 HU Mingyu;ZHOU Xia;LI Ye;TAN Yuqiu(Key Laboratory for Ultra-low Energy Buildings of Jiangxi Province,School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China;School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学建筑工程学院,江西省超低能耗建筑重点实验室,南昌330031 [2]南昌大学建筑工程学院,南昌330031

出　　处：《材料导报》2021年第10期10036-10041,共6页Materials Reports

基　　金：国家自然科学基金(51362021);江西省水利厅科技项目(KT201331)。

摘　　要：优良的室内空气环境对保障居住者健康和舒适性具有重要意义。纳米TiO_(2)和硅藻土等复合可产生协同效应,有望同时起到降解甲醛和调湿作用。通过小室试验研究了TiO_(2)/硅藻土/泥炭藓复合光催化调湿材料对室内甲醛降解和温湿度调节的效果,结果表明该材料可以有效降解甲醛并调节温湿度。通过XRD、SEM、紫外-可见光吸光度及FTIR分析等手段,研究了TiO_(2)/硅藻土/泥炭藓复合光催化调湿材料降解甲醛及调温调湿机制。研究结果表明:在自然光照下,TG-1∶7材料能将小室内甲醛浓度控制在0.06 mg/m 3以内,甲醛去除率达89.1%;TG-1∶7材料能有效地将小室内相对湿度控制在58%RH左右,且能在一定程度上调节室内温度。硅藻土负载纳米TiO_(2)可以改善半导体光生电子(e-)和光生空穴(h+)的分离,减小h+与e-重新组合的速率,且其禁带宽度也有所变窄。光催化调湿材料表面大量的硅羟基可产生更多的布朗斯台德酸性位点,能有效捕获h+并产生羟基自由基(·OH),增强TiO_(2)的光催化活性。Excellent indoor air environment is of great significance to ensure the health and comfort of residents.The composite of diatomite and nano-TiO_(2) may produce synergistic effect,which is expected to degrade formaldehyde and control humidity at the same time.The effect of TiO_(2)/diatomite/sphagnum on the degradation of formaldehyde and the control of temperature and humidity was studied by chamber experiment.It shows that the photocatalytic humidity-controlling materials can effectively degrade formaldehyde and control temperature and humidity.Based on XRD,SEM,UV-visible light absorbance and FTIR analysis,the degradation mechanism of formaldehyde and the mechanism of temperature and humidity regulation of TiO_(2)/diatomite/sphagnum composite were studied.The researches show that under natural light,TG-1∶7 material can control the formaldehyde concentration in the small chamber within 0.06 mg/m 3,and the formaldehyde reduction rate reaches 89.1%;TG-1∶7 mate-rial can effectively control the relative humidity in the small chamber at 58%RH,and can adjust the indoor temperature to a certain extent.The combination of TiO_(2) and diatomite humidity-controlling material can improve the separation of photo-generated electrons(e-)and photo-generated holes(h+)in the semiconductor,delay the rate of recombination of h+and e-,and narrow the band gap.A large number of silicon hydroxyl groups on the surface of the photocatalytic humidity-controlling materials can generate more Bronsted acid site,which can effectively capture h+and generate hydroxyl radicals(·OH),which enhances the photocatalytic activity of TiO2.

关 键 词：光催化调湿材料 温湿度调节 甲醛去除率 禁带宽度 

分 类 号：TU50[建筑科学—建筑技术科学]