Wei Wei, Hu Huihui, Ji Xuelin, Yan Zaoxue, Sun Wei, Xie Jimin
Center of Analysis and Test, Jiangsu University, Zhenjiang 212013, China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China E-mail:
Water Sci Technol. 2018 Aug;78(1-2):402-414. doi: 10.2166/wst.2018.313.
Hydrophilic silica aerogel (HSA) was obtained by sol-gel method and dried at ambient conditions and further studied for the removal of organic dyes in water. Silica aerogel was characterized by its morphology, porous structure, specific surface area and particle size distribution by scanning electron microscopy, Brunauer-Emmett-Teller and pore size distribution. The HSA after calcination had a specific surface area of 888.73 m/g and an average particle size of 2.6341 nm. Moreover, adsorption properties of the HSA toward organic dyes - adsorption conditions, kinetics data, and equilibrium model - were investigated. The removal rate of cationic dyes (rhodamine B (RhB), methylene blue (MB) and crystal violet (CV)) by HSA was up to 90%, while the removal rate of anionic dye (acid orange 7) was not more than 30%. The maximum adsorptions were: RhB 191.217 mg/g, MB 51.1601 mg/g and CV 24.85915 mg/g, respectively. Based on the adsorption mechanism of HSA for cationic/anionic dyes, the conclusion confirmed the prospect of HSA as effective adsorbent to treat cationic dyes wastewater.
通过溶胶 - 凝胶法制备亲水性二氧化硅气凝胶（HSA），并在环境条件下干燥，进一步研究其对水中有机染料的去除效果。通过扫描电子显微镜、布鲁诺尔 - 埃米特 - 泰勒法和孔径分布对二氧化硅气凝胶的形态、多孔结构、比表面积和粒径分布进行了表征。煅烧后的HSA比表面积为888.73 m/g，平均粒径为2.6341 nm。此外，还研究了HSA对有机染料的吸附性能——吸附条件、动力学数据和平衡模型。HSA对阳离子染料（罗丹明B（RhB）、亚甲基蓝（MB）和结晶紫（CV））的去除率高达90%，而对阴离子染料（酸性橙7）的去除率不超过30%。最大吸附量分别为：RhB 191.217 mg/g、MB 51.1601 mg/g和CV 24.85915 mg/g。基于HSA对阳离子/阴离子染料的吸附机理，该结论证实了HSA作为处理阳离子染料废水有效吸附剂的前景。
