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| 1 | 蒙脱石对铬螯合物的吸附行为分析显示文摘研究了不同p H值、初始Cr3+浓度、温度、反应时间等条件下蒙脱石对Cr3+及螯合物[Cr(phen)3]3+的吸附行为,探讨了电动电位变化与吸附性能的关系。结果表明:蒙脱石吸附[Cr(phen)3]3+性能明显优于吸附Cr3+的性能,其主要原因在于蒙脱石对[Cr(phen)3]3+的吸附是静电引力及氢键、范德华力共同作用的结果,并且这种吸附能力基本不受介质酸碱性的影响。动力学研究表明两种吸附均符合准二级反应动力学模型。热力学研究表明蒙脱石对[Cr(phen)3]3+和Cr3+的吸附符合Langmuir的单层吸附模型。蒙脱石对[Cr(phen)3]3+和Cr3+的吸附的ΔG均小于零,而ΔH、ΔS都大于零,因此2种吸附均为自发、吸热和更无序的。 | 叶玲 张敬阳 肖子敬 | 2015 | 矿物学报2015，35，2： | 1 |
| 2 | Characteristics and mechanisms of Ni(Ⅱ) removal from aqueous solution by Chinese loess显示文摘Nickel is a toxic heavy metal among trace elements which has a detrimental impact on living organisms. There is growing need of finding an economic and effective solution for Ni(Ⅱ) immobilization in environments. Chinese loess was selected as adsorbent to remove Ni(Ⅱ) from aqueous solution. Adsorbent dosage, reaction time, solute concentration, temperature, and solution p H also have influences on efficiency of Ni(Ⅱ) removal. The monolayer adsorption capacity of loess towards Ni(Ⅱ) is determined to be about 15.61 mg/g. High temperature and p H favor the removal of Ni(Ⅱ) using Chinese loess soil and the optimal dosage of loess is determined to be 10 g/L. The kinetics and adsorption isotherms of the adsorption process can be best-fitted with the pseudo second order kinetics and Langmuir isothermal model, respectively. The thermodynamic analysis reveals that the adsorption process is spontaneous, endothermic and the system disorder increases with duration. Nickel ions can be removed with the removal efficiency of 98.5% at p H greater than or equal to 9.7. Further studies on loess and Ni(Ⅱ) laden loess(using X-Ray diffraction, Fourier transform infrared spectroscopy) and Ni(Ⅱ) species distribution at various p H have been conducted to discuss the adsorption mechanism. Loess soils in China have proven to be a potential adsorbent for Ni(Ⅱ) removal from aqueous solutions. | 王艳 唐晓武 王恒宇 | 2015 | Journal of Central South University2015，22，11： | 0 |
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