Silver-impregnated zeolitized tuffs for environmental degradation of ozone

Review of the Bulgarian Geological Society Pub Date : 2023-12-01 DOI:10.52215/rev.bgs.2023.84.3.15

B. Barbov, K. Zaharieva, Petya Karakashkova, H. Penchev

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Abstract

The natural zeolites were ultrasonically treated and impregnated with silver nanoparticles. The surface stabilized silver nanoparticles dispersion was obtained using an effective electrochemical reduction method. The phase and elemental composition, structure of the Ag-impregnated zeolites (clinoptilolite and mordenite) was studied by various methods such as powder X-ray diffraction, X-ray fluorescence analyses and Fourier-transform infrared spectroscopy. The Ag-impregnated clinoptilolite and mordenite natural zeolite materials with 1.20 wt %, 0.97 wt %, 0.83 wt % and 1.18 wt % silver content were established by XRF analysis. As initial materials were used three types clinoptilolite from Beli Plast, Most, Golobradovo (Kardzhali, Bulgaria) deposits and mordenite from Lyaskovets deposit in Eastern Rhodopes, Bulgaria. The catalytic ability of Ag-mordenite and Ag-clinoptilolites was investigated in the ecologically important reaction of ozone decomposition. The Ag-loaded mordenite demonstrates the higher conversion degree of ozone more than 40% in comparison with Ag-clinoptilolite materials at room temperature.

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用于臭氧环境降解的银浸渍沸石化凝灰岩

天然沸石经超声波处理后浸渍了纳米银颗粒。利用有效的电化学还原法获得了表面稳定的银纳米粒子分散体。通过粉末 X 射线衍射、X 射线荧光分析和傅立叶变换红外光谱等多种方法研究了银浸渍沸石（clinoptilolite 和 mordenite）的相和元素组成、结构。通过 XRF 分析，确定了含银量分别为 1.20 wt %、0.97 wt %、0.83 wt % 和 1.18 wt % 的 Ag 浸渍霞石和莫代奈天然沸石材料。作为初始材料，使用了来自 Beli Plast、Most 和 Golobradovo（保加利亚 Kardzhali）矿床的三种黝帘石，以及来自保加利亚东罗多佩斯 Lyaskovets 矿床的莫硒石。在具有重要生态意义的臭氧分解反应中，研究了含银莫代锰矿和含银绿帘石的催化能力。在室温下，与 Ag-clinoptilolite 材料相比，Ag-mordenite 的臭氧转化率更高，超过 40%。

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Review of the Bulgarian Geological Society

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