Equilibrium Isotherms and Kinetic Effects during the Adsorption of Pb(II) on Titanosilicates Compared with Natural Zeolite Clinoptilolite

Abstract

The present study focuses on the adsorption of Pb(II) by the H-form of titanosilicates (ETS-4, GTS-1) and clinoptilolite. The H-forms were prepared by first exchanging the extra-framework cations—Na+, K+, Ca2+, etc.—with NH4+, and by subsequent thermal treatment for obtaining H-forms. The purity and thermal behaviour of the initial, NH4+, and H-forms of ETS-4, GTS-1, and clinoptilolite were analysed by powder XRD, while the morphology and size of the particles were determined by SEM. The chemical composition of the solids and the solutions was obtained by WDXRF and ICP-OES, respectively. The kinetics research of the Pb(II) adsorption processes was based on WDXRF and ICP-OES. The H-forms of the materials displayed favourable properties for the adsorption of Pb(II). The best behaviour in this respect was demonstrated by GTS-1 when compared to ETS-4 and clinoptilolite.

Enhanced Removal of As(V) and Pb(II) from Drinking and Irrigating Water Effluents Using Hydrothermally Synthesized Zeolite 5A

“…However, by comparing the R 2 values, it can be determined that the adsorption behavior of 18PZ5A was more consistent with PFO and E, given that they had the same value. The PFO model assumes that adsorption is based on the adsorption capacity of the adsorbent [62], and the E model is generally applied in chemisorption processes; it assumes that the active sites of the adsorbent are heterogeneous [63]. From the value of R 2 , it cannot be determined which model better describes the adsorption since it is an independent criterion [64].…”

Sequestration of Lead Ion in Aqueous Solution onto Chemically Pretreated Pycnanthus angolensis Seed Husk: Implications for Wastewater Treatment

“…Recent reports have shown that heavy metals, even at a minimal concentration, could be detrimental to life forms [1][2][3]. Due to their highly toxic nature and their inability to undergo degradation, they have become a global concern and a major target for most scientists [4][5][6].…”

“…Due to their highly toxic nature and their inability to undergo degradation, they have become a global concern and a major target for most scientists [4][5][6]. These metals have also been found in living cells [1]. Within living organisms, they tend to accumulate, binding to nucleic acids and proteins, thereby disrupting essential cellular functions and causing severe health consequences [1,7,8].…”

“…These metals have also been found in living cells [1]. Within living organisms, they tend to accumulate, binding to nucleic acids and proteins, thereby disrupting essential cellular functions and causing severe health consequences [1,7,8].…”

An Innovative Interaction between Organo-Kaolinite and Methyl Orange for Industrial Wastes Removal – A Kinetic Investigation and Modeling

“…There are the Yan model, the Bohart-Adams model, and the Clark model. They are used to illustrate the breakthrough contaminant curves in the statistical regression column test(Tsvetanova et al, 2022).…”