Use of Activated Clinoptilolite for Direct Dye-Contained Wastewater Treatment

Abstract

This work reveals a method of complex thermal and chemical activation of natural clinoptilolite from Sokyrnytsky deposit. The chemical activation of a mineral was carried out by HCl solutions treatment at various ratios of liquid-to-solid phases. With the use of thermal and infrared (IR) spectroscopic analyses, the adsorption property of a natural and activated clinoptilolite has been examined for water vapor. The ability of complexly activated clinoptilolite to adsorb direct dyes from their aqua solutions has been investigated. The constants of isotherms of monomolecular adsorption by Langmuir have been determined. Activated clinoptilolite has been suggested to be used for the treatment of wastewater containing organic impurities.

Influence of Natural Clinoptilolite Modification with Ions and Zero-Valent Silver on Its Sorption Capacity

“…Thermal treatment leads to the diffusion of exchangeable cations into the internal channels of the zeolite structure, which causes an increase in the free volume of the internal crystalline space, which can be filled with water molecules. 25 In the temperature range (350-370) -(486-500) °С, at the third stage of thermolysis, zeolite samples lose isolated water molecules due to hydrogen bonds with OH groups. This process is accompanied by the appearance of shallow extrema on the DTA DTG curves.…”

Effect of Short Heat Treatment of Amorphous Metal Alloy on Decolorization Dye Mendola Blue

“…Therefore, it is important to use a fast, inexpensive and reliable way of decomposing dyes in waste. Dye treatment methods can be divided into several types [8,9]: physical and chemical methods (adsorption method [10], coagulation, filtration, ion exchange, ultrasonic method, high-energy physical method), chemical treatment methods (ozonation, hypochlorite ion, oxidation method), electrochemical methods (electrochemical oxidation, indirect electro-oxidation with strong oxidants, photoassisted electrochemical methods, electrocoagulation [11,12], electrochemical reduction), advanced oxidation processes (AOPs) [13][14][15], microbiological treatments (pure cultures, mixed cultures), and enzymatic decomposition. The authors [16] summarizes the main technologies utilized for the removal of pollutants.…”

Wood Polymer Composite Based on a Styrene and Triethoxy(Vinylphenethyl)silane

“…Recently, adsorption has been widely utilized to remove heavy metals from aqueous solutions due to its many advantages, such as low cost, easy handling, high removal efficiency, and environmental friendliness. [1][2][3] There are a lot of materials, including polymer-modified silica gel, [4][5][6][7] carbon nanocomposites, 8 magnetic nanoparticles (Fe 3 O 4 ), 9 fibers, 10 and modified natural clays 11,12 that have been used as adsorbents to remove heavy metals from aqueous solutions.…”