{"title":"A simple method to valorize silica sludges into sustainable coatings for indoor humidity buffering","authors":"C. Kuok, Wahid Dianbudiyanto, Shou‐Heng Liu","doi":"10.21203/rs.3.rs-871601/v1","DOIUrl":null,"url":null,"abstract":"In this study, the production of indoor humidity-buffering coatings (IHC-s) from recycling waste silica sludges by using a room-temperature sol-gel method which is a simple and energy-efficient route is reported. The properties of these IHC-s are identified by scanning electron microscope, X-ray diffraction, X-ray fluorescence spectrometer, laser particle size analyzer, N 2 adsorption-desorption isotherms and toxicity characteristic leaching procedure (TCLP). The moisture adsorption-desorption tests show that the IHC-s have moisture buffering values of ca. 270–316 g m − 2 and moisture contents of 23.6–26.7% in the range of 50–90% relative humidity (RH). Furthermore, the humidity buffering capacities, moisture adsorption-desorption rate and stability are significantly superior to commercially available coatings in the range of 50–75% RH. The enhancement may be due to the formation of porous structure in the coatings via the dispersed waste silica sludges and gypsum which transformed from bassanite by self-assembly process. Most importantly, the prepared IHC-s show surpassing antimicrobial efficacy (> 99.99%) and no detectable leaching heavy metals based on TCLP tests, which provides an economic and environmental-friendly route for recovering and valorizing industrial wastes.","PeriodicalId":22130,"journal":{"name":"Sustainable Environment Research","volume":"32 1","pages":"1-9"},"PeriodicalIF":4.6000,"publicationDate":"2021-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Sustainable Environment Research","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.21203/rs.3.rs-871601/v1","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
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Abstract
In this study, the production of indoor humidity-buffering coatings (IHC-s) from recycling waste silica sludges by using a room-temperature sol-gel method which is a simple and energy-efficient route is reported. The properties of these IHC-s are identified by scanning electron microscope, X-ray diffraction, X-ray fluorescence spectrometer, laser particle size analyzer, N 2 adsorption-desorption isotherms and toxicity characteristic leaching procedure (TCLP). The moisture adsorption-desorption tests show that the IHC-s have moisture buffering values of ca. 270–316 g m − 2 and moisture contents of 23.6–26.7% in the range of 50–90% relative humidity (RH). Furthermore, the humidity buffering capacities, moisture adsorption-desorption rate and stability are significantly superior to commercially available coatings in the range of 50–75% RH. The enhancement may be due to the formation of porous structure in the coatings via the dispersed waste silica sludges and gypsum which transformed from bassanite by self-assembly process. Most importantly, the prepared IHC-s show surpassing antimicrobial efficacy (> 99.99%) and no detectable leaching heavy metals based on TCLP tests, which provides an economic and environmental-friendly route for recovering and valorizing industrial wastes.
本研究报道了利用回收的废弃二氧化硅污泥，采用室温溶胶-凝胶法生产室内湿度缓冲涂料（IHC-s），这是一种简单高效的方法。通过扫描电子显微镜、X射线衍射、X射线荧光光谱仪、激光粒度分析仪、N2吸附-解吸等温线和毒性特征浸出程序（TCLP）对这些IHC的性质进行了鉴定。水分吸附-解吸试验表明，IHC-s的水分缓冲值约为270–316 g m− 在50–90%的相对湿度（RH）范围内，水分含量为23.6–26.7%。此外，在50–75%RH范围内，湿度缓冲能力、水分吸附-解吸速率和稳定性显著优于商用涂料。这种增强可能是由于分散的废二氧化硅污泥和石膏通过自组装过程从蓝晶石转化而来，在涂层中形成多孔结构。最重要的是，制备的IHC-s显示出超越的抗菌功效（> 99.99%），并且基于TCLP测试没有可检测的浸出重金属，这为回收和估价工业废物提供了一条经济和环境友好的途径。
期刊介绍：
The primary goal of Sustainable Environment Research (SER) is to publish high quality research articles associated with sustainable environmental science and technology and to contribute to improving environmental practice. The scope of SER includes issues of environmental science, technology, management and related fields, especially in response to sustainable water, energy and other natural resources. Potential topics include, but are not limited to: 1. Water and Wastewater • Biological processes • Physical and chemical processes • Watershed management • Advanced and innovative treatment 2. Soil and Groundwater Pollution • Contaminant fate and transport processes • Contaminant site investigation technology • Soil and groundwater remediation technology • Risk assessment in contaminant sites 3. Air Pollution and Climate Change • Ambient air quality management • Greenhouse gases control • Gaseous and particulate pollution control • Indoor air quality management and control 4. Waste Management • Waste reduction and minimization • Recourse recovery and conservation • Solid waste treatment technology and disposal 5. Energy and Resources • Sustainable energy • Local, regional and global sustainability • Environmental management system • Life-cycle assessment • Environmental policy instruments
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