Adsorption of Heavy Metals Cations onto Zeolite Material from Aqueous Solution

Abstract

expensive and with average efficiency. The most common and widely used methods for advanced heavy metal removal are: chemical precipitation, flotation, flocculation, sedimentation, solvent extraction, oxidation/reduction and dialysis/electro-dialysis, reverse osmosis, ultra filtration, electrochemical deposition, ion exchange and adsorption e.g.Choosing one or more complex solutions is subject of efficiency and cost analysis reported at large quantity of wastewater. Among these, adsorption technologies have several advantages: easy operation and well known technology, inexpensive equipment, less sludge, adsorbents' reuse after desorption. In water the heavy metals cations are hydrated with different bipolar water molecules.Heavy metals (cadmium, copper, zinc, nickel) removal by adsorption was reported on, sugar beet pulp [7] Materials and MethodsRaw Fly Ash was collected from the electrostatic filters in the AbstractIncreased urbanization and industrialization led to excessive release of wastes into the environment; one of them, causing many problems not only to the environment but also to human health, is fly ash resulted from coal combustion. One of the solutions for solving these problems would be fly ash reutilization as an adsorbent for wastewater treatment and for obtaining new and efficient materials such as zeolites. Class "F" fly ash collected from C.H.P. Craiova from Romania was used for obtaining new zeolite materials for advanced wastewater treatment. This material was characterized by AFM, XRD, FTIR, SEM to outline the crystalline and morphology modifications. Hydrothermal modified fly ash using NaOH was used for heavy metals removal (Cd 2+ , Cu 2+ and Ni 2+ ) from synthetic wastewaters containing one, two and three pollutants. For obtaining a maximum efficiency during the adsorption process the adsorption conditions (contact time, optimum amount of substrate) were optimized. These parameters were further used in thermodynamic and kinetic modeling of the adsorption processes. The uptake of Cd 2+ , Cu 2+ and Ni 2+ was followed by a Langmuir adsorption isotherm and the maximum uptake capacity was estimated to be 95.24 mg/g Cd 2+ , 107.52 mg/g Cu 2+ from aqueous solution with two cations. Correlated with the surface structure, composition and morphology the adsorption kinetic mechanisms and the substrate capacities are further discussed.

The use of natural zeolite to remove heavy metals Cu (II), Pb (II) and Cd (II), from industrial wastewater

“…As the initial concentration increases, the driving force increases, which in turn leads to an improvement in the efficiency of the heavy metal removal process. Then, after the system reaches equilibrium, the initial solution concentration does not show any significant change due to a decrease in the number of active sites (Ibrahim & Mutawie, 2013;Ibrahimi & Sayyadi, 2015;Taamneh & Sharadqah, 2017;Visa & Popa, 2015).…”

Removal of Heavy Metals Cd (II), Fe (III) and Ni (II), from Aqueous Solutions by Natural (Clinoptilolite) Zeolites and Application to Industrial Wastewater

“…According to these attracting properties of zeolite, interest has been increased towards the method of heavy metal adsorption from aqueous solution [13,14]. There are several studies carried on the effectiveness and the importance of using natural zeolite for the adsorption of heavy metals under different empirical conditions such as pH, temperature, granular phase volume, concentration, and induction speed [15][16][17][18][19][20].…”

Zinc-reinforced ZSM-5 subject to a rare-earth magnet and the presence of a legume yields substantial copper extraction

“…Overall, the produced partially zinc-augmented ZSM-5 effectively mitigated pollution via two simultaneous mechanisms of copper extraction. The first is the adsorption of Cu 2+ due to the permeability and active sites of the zinc-free mesoporous surface (Priyadi and Mukti, 2015;Visa and Popa, 2015;Renu et al, 2017;Hussain et al, 2021).…”