摘要
以棉花秸秆和玉米秸秆为原料、水蒸气为活化剂,制备不同的活性生物炭材料,探讨不同的活化时间对生物炭材料吸附性能的影响。利用氮气吸附-脱附全自动比表面积和孔隙度分析仪(BET)、扫描电镜(SEM)对活性生物炭材料的孔道和表面结构进行了分析和表征。结果表明:当炭化温度500℃、炭化时间1 h,每克炭化料的水蒸气流量0.04 g·min^(-1)、活化温度800℃、棉花秸秆活化时间30 min、玉米秸秆活化时间45 min,制备的活性生物炭材料吸附性能较好。将最优条件下制得的活性生物炭材料应用于含铬水溶液的处理,研究结果表明,随着溶液Cr(Ⅵ)离子浓度的提高,吸附时间越长,吸附效果越好。
Different activated carbon materials were prepared by using cotton and corn straw as raw materials and steam as the activator.The effect of different activation time on the adsorption properties of biochar was investigated.The pore structure and surface structure of the activated carbon materials were characterized by nitrogen adsorption-desorption,fully automatic specific surface area and porosity analyzer(BET) and the scanning electron microscopy(SEM).The results showed that the adsorption performance of the activated biochar reached best when the carbonization temperature was 500 ℃,carbonization time was 1 h,steam flow per 1 g carbonized material was 0.04 g·min^(-1),activation temperature was 800 ℃,activation time of cotton straw was 30 min,while the activation time of corn straw was 45min.The activated carbon material prepared under the optimal conditions was applied to the treatment of chromiumcontaining solution.The results showed that with the increasing of the adsorption time and Cr(Ⅵ) ion mass concentration in the aqueous solution,the active carbon materials had higher adsorption capacity for Cr(Ⅵ).
作者
赵丽媛
任晓伟
ZHAO Liyuan;REN Xiaowei(Shijiazhuang Luancheng District Environmental Monitoring Center,Shijiazhuang Hebei 051430,China)
出处
《当代化工》
CAS
2024年第7期1673-1678,共6页
Contemporary Chemical Industry
基金
石家庄市科技支撑计划项目(项目编号:171070943A)。
关键词
生物质
秸秆
生物炭
活化
吸附剂
水溶液
动力学
Biomass
Straw
Bio-char
Activation
Adsorbents
Aqueous solution
Kinetics
