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8242969 
Journal Article 
Improving the sorption ability of modified bentonite during wastewater treatment by means of its activation 
Atamanova, OV; Tikhomirova, EI; Kassymbekov, ZK; Podoksenov, AA 
2020 
25 
1 
3-12 
Russian 
Introduction. The article discusses the problem of industrial wastewater treatment using adsorption. Clay materials - bentonites modified with carbon nanotubes, glycerin - are proposed as sorption materials. Studies of sorption materials based on modified bentonite are aimed at finding such bentonite modifications that would ensure the maximum extraction of nitro and amino compounds from contaminated industrial wastewater. Methods and materials. The studies of the sorption activity of bentonites were carried out using simulated solutions of o-phenylenediamine and p-dinitrobenzene. The authors analyzed possible acid (HCl) and salt (CaCl2) activations of modified bentonite. They determined the concentrations of o-phenylenediamine and p-dinitrobenzene in the filtrate using photometric analysis. Statistical processing of the experimental results was performed with the use of the Statistica for Windows 6.0 software package. Results. It was established that bentonite modified with carbon nanotubes after the activation of this sorbent with 9 % HCl and 30 % CaCl2 has the best sorption ability under static conditions with respect to p-dinitrobenzene. Bentonite modified with carbon nanotubes has the best sorption ability with respect to o-phenylenediamine after the activation of this sorbent with 18 % HCl and 38 % CaCl2. The adsorption of o-phenylenediamine by bentonite modified with carbon nanotubes is much higher than the adsorption of p-dinitrobenzene: Г∞ = 66.9 mg/g compared to Г∞ = 2.41 mg/g. A similar phenomenon is observed when comparing the adsorption values of o-phenylenediamine and p-dinitrobegenzole with glycerin-modified bentonite, however, here the difference in values is slightly less: Г∞ = 64.8 mg/g compared to Г∞ = 1.95 mg/g. It is recommended to set the parameters of cylindrical adsorption filters for wastewater treatment from nitro and amino compounds based on the ratio of adsorption column height to diameter equal to H/D = 1.4. © 2020, St. Petersburg State University of Architecture and Civil Engineering. All rights reserved. 
Adsorption; Carbon nanotubes; Glycerin; Modified bentonite; O-phenylenediamine; P-dinitrobenzene; Water treatment efficiency 
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