摘要
用酸改性兰炭基活性炭对焦化废水进行吸附处理,研究了酸的种类、吸附剂投加量、转速等因素对COD去除率的影响,对吸附等温线、吸附动力学和热力学特征进行了探讨。结果表明:经酸改性后,兰炭基活性炭能显著提升对焦化废水的吸附效果,无机酸改性较有机酸更好,硝酸改性效果最佳。318 K条件下,在50 mL焦化废水中加入4 g硝酸改性后的兰炭基活性炭,以100 r/min的转速吸附90 min后,COD去除率可达86.79%;Langmuir等温吸附模型能更好地描述吸附过程,热力学参数ΔG~θ<0、ΔH~θ>0、ΔS~θ>0,表明吸附为自发吸热的单分子层吸附过程,且吸附动力学可用拟二级动力学模型描述。
The blue coke-activated carbon (BAC) modified by the different kinds of acids was used as adsorbent to remove COD from coking wastewater, factors such as acid species, adsorbent dosage and shaking speed which affect COD removal rate of coking wastewater were investigated. In addition, the process of adsorption were fitted by both adsorption isotherm model and adsorption kinetics model. The results showed that the COD removal rate was enhanced after acid modified, the adsorption capacity of inorganic acid modified BAC was better than that of organic acid one, and nitric acid modified was best. The COD removal rate was to reach 86.79% when 4 g nitric acid modified BAC was added into 50 mL coking wastewater in 90 min with shaking speed of 100 r/min at 318 K. Langmuir model could better describe equilibrium adsorption and thermodynamic parameters indicated that the adsorption was spontaneous, endothermic. The kinetic study showed that the adsorption process was best fitted by the pseudo-second order kinetics model.
作者
蒋绪
兰新哲
宋永辉
邢相栋
Jiang Xu;Lan Xinzhe;Song Yonghui;Xing Xiangdong(Shaanxi Province Metallurgical Engineering and Technology Research Centre, School of Metallurgical Engineering, Xi`an University of Architecture and Technology, Xi`an, Shaanxi 710055;Research Institute of Energy and Chemical Industry, Xianyang Vocational Technical College, Xianyang, Shaanxi 712000)
出处
《非金属矿》
CAS
CSCD
北大核心
2019年第3期96-99,共4页
Non-Metallic Mines
基金
陕西省教育厅专项(17JK1170)
咸阳市科学技术研究攻关计划项目(2018k02-19)
咸阳职业技术学院科学技术研究项目(2017KYA02)
关键词
酸改性
兰炭基活性炭
焦化废水
吸附
acid modified
blue coke-activated carbon
coking wastewater
adsorption
