Browsing by Autor "Wilson Aguilar-Mamani"

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Conversion of Glass Waste into Zeolite A Adsorbent for Efficient Ammonium Ion Adsorption from Aqueous Solution: Kinetic and Isotherm Studies
(Multidisciplinary Digital Publishing Institute, 2025) Neysa Pereyra; Urooj Kamran; Wilson Aguilar-Mamani; Farid Akhtar
In this study, a zeolitic adsorbent (AGW-ZA) was successfully developed from glass waste (GW)-derived aluminosilicates. The GW, serving as the starting material, underwent alkaline activation and hydrothermal treatment to yield the AGW-ZA adsorbent, which exhibited a surface area of 216.48 m2/g. The AGW-ZA demonstrated significantly higher ammonium (NH4+) ion adsorption (142.5 mg/g at 1000 mg/L) than pristine GW (80.0 mg/g). Optimal adsorption experimental parameters were identified (0.1 g dosage, pH = 7, and 10 h contact time) to determine the maximum NH4+ ions’ adsorption potential by adsorbents. Kinetic and isotherm models were applied to experimental data to describe the adsorption mechanisms. The pseudo-second-order model provided the best fit for both AGW-ZA and pristine GW, indicating that the adsorption process is followed by chemical interaction via ion exchange. Regarding isotherms, the Freundlich model was most suitable for AGW-ZA, signifying that NH4+ ions adsorbed on heterogeneous adsorbent surfaces by forming multilayers, while the Temkin model fit the pristine GW data, indicating the chemisorption nature with medium adsorbate–adsorbent interactions above the heterogeneous surface. This study explores the potential of transforming discarded GW into a high-performance zeolitic adsorbent for the mitigation of environmental pollution by removing NH4+ ions from wastewater while simultaneously addressing waste management challenges.
Internal structure of a gel leading to NBA-ZSM-5 single crystals
(Springer Science+Business Media, 2018) Wilson Aguilar-Mamani; Jonas Hedlund; Johanne Mouzon
Porous gel structures are formed during the synthesis of the zeolite ZSM-5 due to the reaction between a source of aluminosilicate, sodium hydroxide, water and a structure directing agent, such as e.g. tetrapropylammonium (TPA) or n-butylamine (NBA). In the present work, the formation of the gel in a heterogeneous system leading to the crystallization of NBA-ZSM-5 zeolite from leached metakaolin was studied extensively. The solid and liquid phases obtained after separation were analyzed by inductively coupled plasma sector field mass spectrometry, dynamic light scattering, extreme high resolution-scanning electron microscopy, energy dispersive spectroscopy, high resolution-transmission electron microscopy, X-ray diffraction and nitrogen gas adsorption. The main gel phase formed after hydrothermal treatment exhibited a sponge-like structure resembling those forming in (Na, TPA)-ZSM-5-based systems. For the first time, the walls of the main gel were shown to be inhomogenous and to possess a biphasic internal structure consisting of a mesoporous skeleton of aluminosilicate nanoparticles embedded in a silicate-rich soluble matrix of soft matter. The data presented in this paper is of primary importance to understand the mechanism by which the gel is consumed and contributes to the growth process of the zeolite crystals.
Microstructural evolution of condensed aggregates during the crystallization of ZSM-5 from a heterogeneous system
(Elsevier BV, 2021) Edgar Cárdenas; Wilson Aguilar-Mamani; Cheuk‐Wai Tai; Saúl Cabrera; Jonas Hedlund; Johanne Mouzon
Preparation of zeolite A with excellent optical properties from clay
(Elsevier BV, 2014) Gustavo García; Wilson Aguilar-Mamani; Ivan Carabante; Saúl Cabrera; Jonas Hedlund; Johanne Mouzon
Solution-mediated growth of NBA-ZSM-5 crystals retarded by gel entrapment
(Elsevier BV, 2018) Wilson Aguilar-Mamani; Farid Akhtar; Jonas Hedlund; Johanne Mouzon