Jabłońska Beata, Dróżdż Tomasz, Jabłoński Paweł, Kiełbasa Paweł
Faculty of Infrastructure and Environment, Czestochowa University of Technology, Brzeźnicka St. 60a, 42-200 Częstochowa, Poland.
Faculty of Production and Power Engineering, University of Agriculture in Krakow, Al. Mickiewicza 21, 31-120 Krakow, Poland.
Materials (Basel). 2022 Aug 6;15(15):5426. doi: 10.3390/ma15155426.
The removal of Pb(II), Cd(II) and Ni(II) ions from aqueous solutions by means of nonthermal plasma with a dielectric barrier discharge is investigated. Aqueous solutions with metal ion concentrations from 10 to 100 mg/dm in spring water were used. In the first stage, the optimization of the solution flow rate, generator modulation frequency and duty cycle was made in terms of the removal efficiency of the considered metals. The removal was then investigated as a function of the number of passes of the solution through the cold plasma reactor. The effect of the initial concentration of ions in the solution was studied. Techniques such as composite central design, least squares method and Fourier transform infrared spectroscopy were used. The physical and chemical parameters of the solutions, such as electrical conductivity, pH, temperature, concentration of metal ions and the content of other substances (e.g., total organic carbon), were measured, and the presence of microorganisms was also examined. It was found that each pass of the solution through the cold plasma reactor causes a decrease in the concentration of Cd(II) and Ni(II); the concentration of Pb(II) drops rapidly after one pass, but further passes do not improve its removal. The removal percentage was 88% for Cd(II) after six passes and 72% for Pb(II) after one pass, whereas 19% for Ni(II). The purification mechanism corresponds to the precipitation of metal ions due to the increasing pH of the solution after exposure to cold plasma.
研究了利用具有介质阻挡放电的非热等离子体从水溶液中去除Pb(II)、Cd(II)和Ni(II)离子的方法。使用了金属离子浓度为10至100 mg/dm³的泉水溶液。在第一阶段，根据所考虑金属的去除效率对溶液流速、发生器调制频率和占空比进行了优化。然后研究了去除率与溶液通过冷等离子体反应器次数的函数关系。研究了溶液中离子初始浓度的影响。使用了复合中心设计、最小二乘法和傅里叶变换红外光谱等技术。测量了溶液的物理和化学参数，如电导率、pH值、温度、金属离子浓度和其他物质的含量（如总有机碳），并检测了微生物的存在。结果发现，溶液每次通过冷等离子体反应器都会导致Cd(II)和Ni(II)浓度降低；Pb(II)的浓度在一次通过后迅速下降，但进一步通过并不能提高其去除率。经过六次通过后，Cd(II)的去除率为88%，Pb(II)一次通过后的去除率为72%，而Ni(II)为19%。净化机制对应于由于溶液在暴露于冷等离子体后pH值升高导致金属离子沉淀。
