School of Environment and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404100, China; Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Chongqing 404100, China.
Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Chongqing 404100, China.
J Hazard Mater. 2019 Jul 5;373:131-140. doi: 10.1016/j.jhazmat.2019.01.096. Epub 2019 Mar 21.
To remove toxic Ni(II) ions from wastewater, a novel flower globular magnesium hydroxide (FGMH) was prepared by a gentle method using trisodium citrate as a crystal modifier. This material exhibited a high specific surface area. The synthesized products and adsorption mechanism for Ni(II) ions were examined by diverse characterization technologies and methods. FGMH was employed to remove Ni(II) ions by the adsorption method. The effects of various parameters, viz., the amount of adsorbent, contact time, temperature and pH, on the removal rate by the adsorbent were investigated in detail. The kinetic data fitted well with a pseudo-second-order model and experimental equilibrium adsorption data conformed to a Langmuir isotherm under optimized conditions. The optimal process parameters included 30 mg of FGMH, a 50 min contact time, pH values between 6.07 and 7.71 for the Ni(II) solution, and adsorption at room temperature for 50 mL of 80 mg/L Ni(II) solution. The percentage of removal efficiency was found to be above 92.64%, and the maximum adsorption capacity of MH was 287.11 mg/g under optimum adsorption conditions. The analyses indicated that the Ni(II) ions were chemisorbed on the FGMH surface.
为了去除废水中的有毒 Ni(II)离子，采用一种温和的方法，使用柠檬酸三钠作为晶型调节剂，制备了一种新型的花球状氢氧化镁（FGMH）。该材料具有较高的比表面积。通过多种表征技术和方法对合成产物和 Ni(II)离子的吸附机理进行了研究。采用吸附法用 FGMH 去除 Ni(II)离子。详细考察了各种参数（如吸附剂用量、接触时间、温度和 pH 值）对吸附剂去除率的影响。动力学数据很好地符合拟二级模型，实验平衡吸附数据在优化条件下符合 Langmuir 等温线。最佳工艺参数包括 30mg FGMH、50min 接触时间、Ni(II)溶液 pH 值在 6.07 到 7.71 之间，以及在室温下吸附 50mL80mg/L Ni(II)溶液。在最佳吸附条件下，去除效率百分比大于 92.64%，MH 的最大吸附容量为 287.11mg/g。分析表明，Ni(II)离子被化学吸附在 FGMH 表面。
