Abstract
The present study deals with natural stilbite zeolite commonly named as Ca-stilbite. Ion exchange process is carried out for partial exchange of calcium ions by copper ions. Ion exchanged stilbite is characterized by different spectroscopic techniques as XRD, FTIR and EDS techniques. Thick films are deposited on pre-cleaned glass substrates using screen printing technique. The sintered films are finally used for ethanol detecting. The Ca-stilbite zeolite structure is confirmed by the characterization techniques XRD and FTIR. Incorporation of copper ions in stilbite structure can be confirmed by EDS data. The Cu-stilbite films showed good ethanol detectors. The operating temperature, ethanol response, response/recovery nature are observed to be the functions of concentration of copper ions. Higher the copper concentration (0.2M) lower is the operating temperature (90°C) and higher is the ethanol sensitivity (233). It can be concluded that partial replacement of calcium by copper ions in stilbite leads to change in operating temperature and sensitivity.
Highlights
Zeolite, one of the pompous classes of porous materials, is a hydrated aluminosilicate crystalline mineral with a typical framework structure containing regular and uniform pores and channels
The Ca -stilbite zeolite structure is confirmed by the characterization techniques XRD and FTIR
It can be concluded that partial replacement of calcium by copper ions in stilbite leads to change in operating temperature and sensitivity
Summary
One of the pompous classes of porous materials, is a hydrated aluminosilicate crystalline mineral with a typical framework structure containing regular and uniform pores and channels. Natural form of zeolite is the outcome of organic reactions of the volcanic residue and limy water [1,2]. These natural mineral species are categorized based on their crystal composition and framework The facts like excessive availability, large surface area, high thermal & chemical steadiness, extraordinary adsorption capacity, ion exchange capability, easy approachability and cost effectiveness make them versatile materials in terms of industrial and environmental applications [3,4,5]. Crystal structure of stilbite has a distinctive zeolite openness wherein sizeable ions and molecules can inhabit and can channel freely within the frame.
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