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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)。
Biomass-based leather was used as raw material to prepare biomass-based carbon membranes under the control of thermal decomposition. The morphology, pore structure and pore structure of biomass-based carbon films prepared at different carbonization temperatures (550-950 ℃) were studied by means of TG / DTG, XRD, FT-IR, SEM, TEM and N2 adsorption-desorption Surface chemistry was characterized. The effects of carbonization temperature, reaction time, solution pH, addition amount and other factors on the lead ions in the carbon membrane adsorption solution were investigated. The characterization results show that with the increase of carbonization temperature, the carbon-based carbon crystallites of biomass-based carbon film tend to graphitize, the total pore volume continues to increase, and the pore structure becomes more developed. The experimental results showed that with the increase of carbonization temperature, the adsorption of Pb2 + on the biomass-based carbon membrane was significantly improved. When the initial Pb2 + concentration was 50 mg · L ~ (-1), the pH of the solution was 5.5, Under the condition of 1.5 g · L ~ (-1) and 6 h adsorption time, the carbon film prepared at 950 ℃ has a good removal efficiency for lead ions with the removal rate of 99.9% and the adsorption capacity of 32.76 mg · g ~ (-1).