废弃水厂用煤质颗粒活性炭吸附苯甲酸钠性能研究
Study on the adsorption performance of sodium benzoate on waste coal granular activated carbon from water plants
李璐 1周克梅 2周卫东 2范佩 2刘振东 2周冰洁 2吴彬彬 3王郑3
作者信息
- 1. 南京林业大学 土木工程学院,江苏 南京 210037;南京水务集团有限公司,江苏 南京 210002
- 2. 南京水务集团有限公司,江苏 南京 210002
- 3. 南京林业大学 土木工程学院,江苏 南京 210037
- 折叠
摘要
直接再利用某水厂的废弃活性炭作为苯甲酸钠的吸附剂.通过对废弃活性炭进行灰分、SEM-BET表征分析得,废弃活性炭表面变得光滑,碘值仅有339.86 mg/g,介孔占比大,表明活性炭表面吸附位点被占据,其吸附性能下降.拟合结果显示,废弃活性炭对苯甲酸钠的吸附更符合Freundlich等温模型和拟二级动力学模型.随着温度的升高,苯甲酸钠的去除率下降,与热力学参数焓变是负值一致,属于放热反应.拟合的废弃活性炭对苯甲酸钠的最大吸附容量为1.108 mg/g,证明了废弃活性炭可应用于工业废水中,为水厂最终处置废弃活性炭找到了新的出路.
Abstract
Waste activated carbon from a water plant is used as the adsorbent of sodium benzoate.Through ash,SEM and BET characterization analysis of the waste activated carbon,the surface of the waste activa-ted carbon became smooth,the iodine value was only 339.86 mg/g,and the mesoporous proportion was large,indicating that the adsorption site on the surface of the activated carbon was occupied,and its ad-sorption performance decreased.The fitting results showed that the adsorption of sodium benzoate by waste activated carbon was more consistent with Freundlich isothermal model and pseudo-second-order kinetic model.With the increase of temperature,the removal rate of sodium benzoate decreases,which is consist-ent with the negative enthalpy change of thermodynamic parameter,and belongs to exothermic reaction.The maximum adsorption capacity of waste activated carbon for sodium benzoate is 1.108 mg/g,which proves that waste activated carbon can be applied to industrial wastewater,and finds a new way for the fi-nal disposal of waste activated carbon in water plants.
关键词
废弃活性炭/苯甲酸钠/吸附/资源化利用Key words
disused activated carbon/sodium benzoate/adsorption/resource utilization引用本文复制引用
基金项目
国家重点研发计划(2018YFC0408000)
国家重点研发计划(2018YFC0408004)
南京水务集团有限公司科技创新项目(YF2022-003)
出版年
2024
NETL
NSTL
万方数据