INCDO-INOE 2000, Research Institute for Analytical Instrumentation, 67 Donath Street, 400293 Cluj-Napoca, Romania.
Zeolites Production S.A., 359 Republicii Street, Rupea, 505500 Brasov, Romania.
Molecules. 2022 Jun 20;27(12):3938. doi: 10.3390/molecules27123938.
Increased concentrations of heavy metals in the environment are of public health concern, their removal from waters receiving considerable interest. The aim of this paper was to study the simultaneous adsorption of heavy metals (Cu, Cd, Cr, Ni, Zn and Pb) from aqueous solutions using the zeolitic volcanic tuffs as adsorbents. The effect of thermal treatment temperature, particle size and initial metal concentrations on the metal ions sorption was investigated. The selectivity of used zeolite for the adsorption of studied heavy metals followed the order: Pb > Cr > Cu > Zn > Cd > Ni. The removal efficiency of the heavy metals was strongly influenced by the particle sizes, the samples with smaller particle size (0−0.05 mm) being more efficient in heavy metals removal than those with larger particle size (1−3 mm). Generally, no relevant changes were observed in heavy metals removal efficiency for the treatment temperatures of 200 °C and 350 °C. Moreover, at a higher temperature (550 °C), a decrease in the removal efficiencies was observed. The Cd, Zn, Cu, Cr, Zn and Ni sorption was best described by Langmuir model according to the high values of correlation coefficient. The pseudo-first-order kinetic model presented the best correlation of the experimental data.
环境中重金属浓度的增加引起了公众健康关注，因此人们对去除水中的重金属产生了浓厚的兴趣。本文的目的是研究沸石状火山凝灰岩作为吸附剂同时从水溶液中吸附重金属（Cu、Cd、Cr、Ni、Zn 和 Pb）。考察了热处理温度、粒径和初始金属浓度对金属离子吸附的影响。所用沸石对研究重金属的吸附选择性顺序为：Pb > Cr > Cu > Zn > Cd > Ni。重金属的去除效率受粒径的强烈影响，粒径较小（0−0.05mm）的样品比粒径较大（1−3mm）的样品更有效地去除重金属。通常，在 200°C 和 350°C 的处理温度下，重金属去除效率没有明显变化。此外，在较高温度（550°C）下，观察到去除效率下降。Cd、Zn、Cu、Cr、Zn 和 Ni 的吸附最符合朗缪尔模型，根据相关系数的高值。准一级动力学模型对实验数据的相关性最好。
