LIU Zhifeng*,TANG Bo,SONG Fengmin,et al.Adsorption Performance of Earthworm Manure Biochar to Cd2+ in Wastewater[J].Plating & Finishing,2021,(6):57-61.[doi:10.3969/j.issn.1001-3849.2021.06.011]
蚯蚓粪生物炭对废水中Cd2+的吸附效果
- Title:
- Adsorption Performance of Earthworm Manure Biochar to Cd2+ in Wastewater
- 文献标志码:
- A
- 摘要:
- 采用高温热解的方法制备了一种蚯蚓粪生物炭（EB），并用其吸附废水中的Cd2+，研究了Cd2+初始浓度、pH、EB投加量、反应温度、吸附时间对吸附效果的影响，分析了等温吸附和吸附动力学特征。结果表明：Cd2+的初始浓度为8 mg/L，EB的投加量为2.0 g/L，pH=5.0，温度为30 ℃，吸附时间为150 min条件下吸附效果最佳，Cd2+去除率可达96.79 %。蚯蚓粪生物炭对Cd2+的吸附过程更符合Freundlich等温吸附模型和准二级吸附动力学模型，吸附过程是以多层非均相吸附为主的化学吸附。
- Abstract:
- Earthworm manure biochar （EB） was prepared by high temperature pyrolysis and used to adsorb Cd2+ in wastewater. The influencing factors, such as initial concentration of Cd2 +, pH value, dosage of the biochar, temperature and adsorption time, were investigated. The adsorption mechanism was discussed by isothermal adsorption model and adsorption dynamics model. The results showed that the optimum adsorption conditions were as follows: the initial concentration of Cd2+ was 8 mg/L, the dosage of biochar was 2.0 g/L, pH value was 5.0, the temperature was 30 ℃, the adsorption time was 150 min. Under the above circumstance, the removal rate of Cd2+ reached 96.79 %. The adsorption process of Cd2+ could be well fitted by the Freundlich isothermal adsorption model and the quasi-secondary adsorption kinetics model. The adsorption process was a chemical adsorption which was mainly controlled by multi-layer heterogeneous adsorption.
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备注/Memo
收稿日期： 2020-03-09；修回日期： 2020-06-10
作者简介： 刘智峰(1979—)，男，甘肃天水人，副教授，主要从事环境污染与修复方面研究。email：lzhifeng2005@163.com
基金项目： 陕西理工大学科研项目（SLGRCQD2027，SLGFPZX2001）；陕西省教育厅科技计划项目（20JY008）