摘要
以生物质二层牛皮为原料,在控制热分解条件下制备了生物质基炭膜。利用TG/DTG、XRD、FT-IR、SEM、TEM和低温N_2吸附-脱附等方法对在不同炭化温度下(550~950℃)制备的生物质基炭膜形貌特征、孔隙结构及其表面化学性质进行了表征。考察了炭化温度、反应时间、溶液pH、加入量等因素对炭膜吸附溶液中铅离子的影响。表征结果表明:随着炭化温度的升高,生物质基炭膜碳微晶趋于石墨化发展,总孔容积持续增大,孔隙结构变得更加发达。实验结果表明:随炭化温度升高,生物质基炭膜对铅离子的吸附效果明显变好;在初始铅离子质量浓度为50 mg·L^(-1)、溶液pH为5.5、吸附剂加入量为1.5 g·L^(-1)、吸附时间为6 h的条件下,950℃下所制炭膜对铅离子有较好去除效果,去除率可达99.9%,吸附容量为32.76 mg·g^(-1)。
A biomass-based carbon membrane was prepared from split leather via a pyrolysis reaction at 550~ 950 ℃. The surface morphology,pore structure,and surface chemical properties of the carbon membrane samples were characterized by thermogravimetry / derivative thermogravimetry（ TG / DTG）, X-ray diffraction（ XRD）,Fourier transform infrared spectroscopy（ FTIR）,scanning electron microscopy（ SEM）,transmission electron microscopy（ TEM）,and N_2adsorption-desorption isotherm techniques. The effects of carbonization temperature,reaction time,solution pH,and dosage on Pb（ Ⅱ） adsorption by the biomass-based carbon membrane were investigated. Upon increasing the carbonization temperature,a significant increase in carbon crystallinity toward graphitization was observed,along with an increase in total pore volume and pore structure. Furthermore,the adsorptive performance of the biomass-based carbon membrane improved with an increase in carbonization temperature. Indeed,the biomass-based carbon membrane derived at 950 ℃ exhibited a high Pb（ Ⅱ） adsorption performance,with a removal rate of 99. 9% and an adsorption capacity of 32. 76 mg·g-1being achieved with an initial Pb（ Ⅱ） concentration of 50 mg·L-1,a solution pH of 5. 5,a carbon membrane dosage of 1. 5 g·L-1,and a measurement time of 6 h.
作者
刘沅
夏靖靖
林珈羽
张越
童仕唐
LIU Yuan XIA Jingjing LIN Jiayu ZHANG Yue TONG Shitang(School of Chemical Engineering and technology, Wuhan University of Science and Technology, Wuhan 430081, China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第11期6171-6178,共8页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51174150)
关键词
二层牛皮
生物质基炭膜
铅离子
吸附特性
split leather
biomass-based carbon membrane
lead ion
adsorption performance
