Hierarchically porous zeolite X composites for manganese ion-exchange and solidification: Equilibrium isotherms, kinetic and thermodynamic studies

Abstract

This paper deals with the kinetic and isotherm studies of manganese ion removal by zeolite X and its hierarchically porous composites as ion-exchange materials. A hydrothermal treatment was applied to grow a layer of zeolite X over diatomite and carbon surfaces. The hierarchically porous composites used for Mn 2+ ion removal showed higher ion-exchange capacity when compared to pure zeolite X under same conditions. A thermodynamic study of the rate of ion-exchange revealed that the intra-particle diffusion rate constant of zeolite X/carbon and zeolite X/diatomite was higher than that of pure zeolite X indicating that the intra-particle diffusion was enhanced when zeolite was prepared in form of hierarchically porous composites. The study showed that the thickness of boundary film of zeolite X/carbon and zeolite X/diatomite was less than that of pure zeolite X indicating ion diffusion resistance to the active sites was reduced when the composites were utilised. The experimental data showed good agreement with Freundlich model. The calculated thermodynamic parameters such as ΔG°, ΔH° and ΔS° indicated the ion-exchange process of Mn 2+ ion by zeolite X and its composites was spontaneous, endothermic and the randomness increased at the liquid/solid interface under the conditions studied. The results of kinetic study showed that the ion-exchange of Mn 2+ ion by zeolite X and its composites followed a pseudo second order

A Comparative Study of MFI Zeolite Derived from Different Silica Sources: Synthesis, Characterization and Catalytic Performance

“…Meanwhile, due to their extremely high thermal stability and chemical resistance, they have been widely used in industrial production [1][2][3][4][5][6]. Owing to tunable porosity and molecule shape selectivity, zeolites can be used as adsorbent, ion-exchange material and catalysts, and so on [7][8][9][10][11]. A large variety of reactions such as cracking, isomerization, dewaxing, dehydration, hydrodeoxygenation and alkylation can be accomplished with microporous zeolites [12][13][14][15][16][17][18].…”

Zeolite NaP1 Functionalization for the Sorption of Metal Complexes with Biodegradable N-(1,2-dicarboxyethyl)-D,L-aspartic Acid

“…The values of 1/n and K F were designated from the slope and intercept of the Freundlich plots (logq e vs. logC e ). K F and n are the Freundlich constants, K F is related to the adsorption capacity (mg/g), and 1/n is an empirical parameter related to the intensity of the reaction and energy heterogeneity [ 18 ].…”

Evolution of adsorption process for manganese removal in water via agricultural waste adsorbents

“…Furthermore, adsorption is also an attractive and economical process, as the adsorbent can be regenerated and reused. It is also interesting that adsorption does not produce secondary waste as no sludge is generated during the removal process of heavy metals, even from the diluted solutions ( Goher et al., 2015 ; Mthombeni et al., 2016 ; Al-Jubouri and Holmes, 2017 ). Adsorption also has the ability to remove pollutants at low concentrations with low energy consumption ( Anu, 2015 ; Ahmad et al., 2015 ).…”

“…The growing attention to manganese contamination in the water has led to the discovery of various treatment technologies ( Baysal et al., 2013 ). Prevalent treatment technologies developed for the treatment of manganese-containing water include chemical precipitation, ion exchange, oxidation, electrochemical treatment, ultraviolet irradiation, ozone and membrane filtration ( Jeirani et al., 2015 ; Ihsanullah et al., 2016 ; Al-Jubouri and Holmes, 2017 ; Carolin et al., 2017 ; Alvarez-Bastida et al., 2018 ; Fatemeh Seyedpour et al., 2018 ; Du et al., 2019 ).…”