摘要
以大豆秸秆为原料,采用ZnCl2活化法制备大豆秸秆活性炭(soybean straw activated carbon,记作SSAC),通过扫描电子显微镜(SEM)、傅立叶变换红外光谱(FT-IR)对样品进行形貌表征,研究了炭化温度、炭化时间等条件对SSAC亚甲基蓝吸附值的影响,通过静态实验研究了SSAC对水溶液中Cu^(2+)的吸附特性,并考察了溶液pH、温度和时间对SSAC吸附Cu^(2+)的影响。结果表明,制备SSAC的优化工艺条件是:ZnCl2活化浓度3 mol/L,炭化温度700℃,炭化时间40 min,该条件下SSAC的亚甲基蓝吸附值为1.84 mL/0.1 g。当Cu^(2+)溶液初始浓度为10 mg/L,SSAC投加量为0.2 g,在pH5.0、温度50℃、时间50 min时,SSAC对于Cu^(2+)离子的吸附效果最好,最大吸附量4.589 mg/g,脱除率为91.77%。SEM和FT-IR观察发现,大豆秸秆活性炭具有丰富发达的基于多层石墨状的裂隙结构,表面含有丰富的C=O、O-H、C=C和C-O含氧官能团。大豆秸秆活性炭对于Cu^(2+)离子吸附性能较好,适用于含Cu^(2+)废水处理及金属离子吸附。
The activated carbon was prepared from soybean straw by using ZnCl2 as the activation agent and analysis methods such as SEM and FT-IR were used to characterize the SSAC.The influence of activation time and activation temperature on methylene blue adsorption value for soybean straw activated carbon were studied,and the adsorption characteristics of Cu^(2+)using the SSAC in water solution were studied through static experiments,the influence of solution pH value,temperature and time were investigated.The results showed that the optimum preparation conditions were determined as follows:The activation concentration of ZnCl2 was 3 mol/L,carbonization temperature was 700℃,carbonization time was 40 min.Under this condition,the methylene blue adsorption value for SSAC was 1.84 mL/0.1 g.When the initial concentration of Cu^(2+)was 10 mg/L,the dosage of SSAC was 0.2 g,SSAC had the best adsorption effect when pH was 5.0,temperature was 50℃and time was 50 min.The maximum adsorption capacity of SSAC was 4.589 mg/g,the removal rate was 91.77%.The morphology and structure of active carbon were observed by SEM and FT-IR,the activated carbon had rich and developed fracture structure based on multi-layer graphite,which was rich in oxygen-containing functional groups such as hydroxyl carboxyl ketonic carbonyl aliphatic ether and ester group on the surface.Therefore,this activated carbon has a good adsorption performance for Cu^(2+)ions,it is suitable for treating wastewater containing Cu 2+and metal ion adsorption.
作者
燕翔
张少飞
王都留
裴平
王文健
李娟
李菲
赵艳霞
YAN Xiang;ZHANG Shao-fei;WANG Du-liu;PEI Ping;WANG Wen-jian;LI Juan;LI Fei;ZHAO Yan-xia(College of Agricultural and Forestry Technical,Longnan Teacher’s College,Longnan 742500,China;Kuyeke Primary School in Gedaliang Township,Atushi 845355,China;Zhangping Primary School in Jifeng Township,Chengxian County,Longnan 742513,China)
出处
《食品工业科技》
CAS
北大核心
2021年第1期68-74,共7页
Science and Technology of Food Industry
基金
甘肃省高等学校创新能力提升项目(2019A-188)
甘肃省陇南市科技基金项目(2019-ZD-12)
陇南师范高等专科学校博士科研启动基金项目
陇南师范高等专科学校教学改革项目(JXGG201806)。
