摘要
采用共沉淀法制备了粒径为10nm的Fe_3O_4磁性微粒,分散于水中生成饱和磁化强度35 mT的水基磁流体,用此磁流体对模拟与实际废水中的Cr(Ⅵ)进行了吸附研究。结果表明,吸附的最佳实验条件为pH=3,温度为45℃,吸附时间为0.5 h。用Langmuir等温模型和假二级动力学模型探讨了磁流体对Cr(Ⅵ)的吸附机理,该过程为单离子层吸附。在最佳实验条件下,磁流体对实际制革废水中Cr(Ⅵ)的饱和吸附量达66.5 mg/g,废水中残留Cr(Ⅵ)浓度为0.2 mg/L,低于工业废水排放的国家标准(0.5 mg/L)。
The adsorption behavior of chromium（Ⅵ） in contaminated water on Fe3O4 magnetic nano-particles was studied in this paper. The adsorbent applied here was prepared by co-precipitation, which can form water-based ferro-fluids. The Ms of ferro-fluids is 35 mT. The results indicate that the optimum condition of adsorption is as follows： value of pH=3, temperature is 45 ℃, and adsorption time is 0.5 h. The adsorption process follows the pseudo,second kinetics of the Langmuir isotherm, which indicates the adsorption is a monolayer adsorption. Under the optimum condition, the adsorption capacity of Fe3O4 magnetic nano-particles for the contaminated water is 66.5 mg/g. After treatment, the concentration of chromium（Ⅵ） is 0.27 mg/L, which is lower than that of the national standard of contaminated water that contains chromium（Ⅵ） （0.5 mg/L）.
出处
《大连大学学报》
2008年第3期119-123,共5页
Journal of Dalian University
关键词
磁流体
Cr(Ⅵ)
吸附
ferro-fluids
chromium （Ⅵ）
adsorption
