分光光度法用于硅藻土的甲醛吸附性能评价  

A Spectrophotometry Method to Quantitatively Evaluate the Adsorption of Formaldehyde upon Diatomite

作　　者：佟钰[1] 张君男[1] 马秀梅[1] 孙仁孟 TONG Yu;ZHANG Junnan;MA Xiumei;SUN Renmeng(School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang,China,110168;China Northeast Architectural Design and Research Institute Co.,Ltd.,Shenyang,China,110006)

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168 [2]中国建筑东北设计研究院有限公司,辽宁沈阳110006

出　　处：《沈阳建筑大学学报（自然科学版）》2018年第5期929-935,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家十三五国家重点研发计划项目(2016YFC0700807);辽宁省教育厅科学技术研究项目(LZJ2016015)

摘　　要：目的解析硅藻土对甲醛分子的吸附能力,阐释其作用机理.方法采用乙酰丙酮分光光度法,测试分析硅藻土吸附剂对溶液和蒸汽中所存在甲醛分子的吸附作用,考察对比蒸汽环境中甲醛初始浓度和相对湿度对甲醛吸附量的影响规律.结果硅藻土的引入导致甲醛溶液浓度不降反升,而在蒸汽环境中,硅藻土对甲醛的吸附量随时间延长而缓慢增长,与甲醛溶液初始浓度大致呈正比关系;相对湿度对硅藻土的甲醛吸附能力影响显著,在相对湿度11%条件下,硅藻土的24 h甲醛吸附量达到最高值.结论溶液环境中硅藻土对甲醛分子并不具有明显的选择性吸附,而在蒸汽环境中,硅藻土对甲醛的吸附过程首先是水蒸气在样品表面的物理吸附,而甲醛分子则溶解于样品表面的外层吸附水中.With a purpose of revealing the efficiency and working mechanism of diatomite in the removal of formaldehyde,a spectrophotometry method by making use of diacetylmethane as the chromogenic agent was employed in this work to determine the adsorption capacity of diatomite to formaldehyde under the atmosphere of formaldehyde aqueous solution and formaldehyde vapor,respectively,following by a detailed investigation on the influence of initial formaldehyde concentration and atmosphere relative humidity(RH).The results show that the diatomite did not behave evident efficiency to remove formaldehyde from its aqueous solution.Under the atmosphere of formaldehyde vapor,the adsorption of formaldehyde molecular onto diatomite must started from the gradually increasing adsorption of water vapor onto the surface of diatomite,after which formaldehyde molecules subsequently dissolved into the adsorbed water film.As an evidence,the concentration of formaldehyde increased slowly with the testing time and the initial concentration of formaldehyde.In the meanwhile,it has been found that the relative humidity(RH)of the surrounding atmosphere played an important role in the adsorption process of formaldehyde onto diatomite,resulting in a maximum capacity of formaldehyde adsorption at a RH value of about 11%.

关 键 词：硅藻土 甲醛 吸附 分光光度 

分 类 号：TU564.5[建筑科学—建筑技术科学] O647[理学—物理化学]