Synthetic inorganic ion-exchange materials. Part XLIX. Adsorption and desorption behaviour of heavy metal ions on hydrated titanium dioxide

A coupled adsorption–desorption thermo-kinetic model is developed incorporating both adsorption and desorption reactions. A local pseudo-equilibrium condition at the interface of adsorbent and adsorbate bulk phases was used as isotherm equation which can even be applied for multi-pollutants scenarios. The developed model is then validated using collected experimental data of heavy metal ions (Pb, Cu, Cd, Zn, and Ni). Comparisons were made for a number of isotherm and kinetic models to examine the performance of the proposed model. The developed model revealed desirable accuracy and superiority over other models in predicting the adsorption behavior and can be used for other systems of concern. The model correlates the adsorption kinetic with an [Formula: see text] value of 0.9391 and desorption kinetic with an [Formula: see text] value of 0.9383. By application of the proposed model to any available adsorption datasets, the individual characteristics of adsorption and desorption can be determined.

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Modified ion exchange jackfruit seeds resin for removal of selected trace heavy metal ions from aqueous solution

African Journal of Pure and Applied Sciences ◽

10.33886/ajpas.v2i2.211 ◽

2021 ◽

Vol 2 (2) ◽

pp. 84-92

Author(s):

S N Ndung’u ◽

E W Nthiga ◽

R N Wanjau

Keyword(s):

Heavy Metal ◽

Ion Exchange ◽

Metal Ions ◽

Heavy Metal Ions ◽

Active Sites ◽

Ion Exchange Resin ◽

Standard Entropy ◽

Environmentally Sustainable ◽

Heavy Metal Ions Removal ◽

Metal Ions Removal

Water is essential for every life processes. However, its quality is deteriorating every day due to the recent industrial advancements. Anthropogenic processes such as industrialization, mining and agricultural activities have led to alarming discharge of heavy metal ions to the aquatic bodies. This possess a greater threat to human, animal and the entire ecosystem wellbeing. Accumulation of heavy metal ions in drinking water beyond permissible limits is detrimental to human health. Therefore, their removal is paramount. Conventional remediation techniques have been employed but have remained expensive and not universally appropriate. This has therefore spurred research interests in the use of adsorption techniques from locally available materials as an environmentally sustainable alternative. Jackfruit seeds are discarded as wastes of a Jackfruit and can be utilized as an ion exchange resin in heavy metal ions removal from wastewater. The present study involved application of previously prepared raw and modified Jackfruit seed resins to study thermodynamics of copper (II), lead (II) and cadmium (II) ions adsorption from synthetic water. FTIR results showed presence of functional groups in raw and modified resins as important sites for studying thermodynamics of adsorption of copper (II), lead (II) and cadmium (II) ions. Thermodynamic data showed that standard Gibb’s free energy () values for all metals were negative indicating that adsorption process was feasible and favourable. Standard enthalpy change (), standard entropy () and activation energy () were positive (> 40 kJ mol-1) and in the order lead (II) > copper (II) > cadmium (II). This confirmed adsorption of copper (II), lead (II) and cadmium (II) ions onto both raw and modified resins was predominated by chemical interactions between the metal ions and the resin active sites. This was confirmed by very low values of sticking probability (S*). The findings indicated that ion exchange Jackfruit seeds resin is promising for heavy metal ions removal from wastewater in an optimized temperature controlled system.

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Applications of Inorganic Ion Exchangers: II—Adsorption of Some Heavy Metal Ions from Their Aqueous Waste Solution Using Synthetic Iron(III) Titanate

Adsorption ◽

10.1023/b:adso.0000024038.32712.18 ◽

2004 ◽

Vol 10 (1) ◽

pp. 87-92 ◽

Cited By ~ 29

Author(s):

M.M. Abou-Mesalam

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Heavy Metal Ions ◽

Ion Exchangers ◽

Waste Solution ◽

Inorganic Ion Exchangers ◽

Inorganic Ion ◽

Aqueous Waste

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A new functionalized reduced graphene oxide adsorbent for removing heavy metal ions in water via coordination and ion exchange

Separation Science and Technology ◽

10.1080/01496395.2018.1497655 ◽

2018 ◽

Vol 53 (18) ◽

pp. 2896-2905 ◽

Cited By ~ 15

Author(s):

Chao-Zhi Zhang ◽

Bin Chen ◽

Yuan Bai ◽

Jing Xie

Keyword(s):

Heavy Metal ◽

Graphene Oxide ◽

Ion Exchange ◽

Metal Ions ◽

Reduced Graphene Oxide ◽

Heavy Metal Ions ◽

Reduced Graphene

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Molecular simulation of adsorption properties of thiol-functionalized titanium dioxide (TiO2) nanostructure for heavy metal ions removal from aqueous solution

Journal of Molecular Liquids ◽

10.1016/j.molliq.2021.118281 ◽

2021 ◽

pp. 118281

Author(s):

Beibei Chen ◽

Lin Li ◽

Lei Liu ◽

Jianxin Cao

Keyword(s):

Aqueous Solution ◽

Heavy Metal ◽

Titanium Dioxide ◽

Metal Ions ◽

Molecular Simulation ◽

Heavy Metal Ions ◽

Adsorption Properties ◽

Heavy Metal Ions Removal ◽

Tio2 Nanostructure ◽

Metal Ions Removal

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Recent Advances in Water Treatment Using Graphene-based Materials

Mini-Reviews in Organic Chemistry ◽

10.2174/1570193x16666190516114023 ◽

2020 ◽

Vol 17 (1) ◽

pp. 74-90 ◽

Cited By ~ 1

Author(s):

Nader Ghaffari Khaligh ◽

Mohd Rafie Johan

Keyword(s):

Heavy Metal ◽

Water Treatment ◽

Ion Exchange ◽

Metal Ions ◽

Metal Ion ◽

Heavy Metal Ions ◽

Membrane Filtration ◽

Chemical Precipitation ◽

High Specific Surface Area ◽

Adsorption Parameters

: A variety of processes were reported for efficient removing of heavy metal from wastewater, including but not limited to ion exchange, reverse osmosis, membrane filtration, flotation, coagulation, chemical precipitation, solvent extraction, electrochemical treatments, evaporation, oxidation, adsorption, and biosorption. Among the aforementioned techniques, adsorption/ion exchange has been known as a most important method for removing heavy metal ions and organic pollutants due to great removal performance, simple and easy process, cost-effectiveness and the considerable choice of adsorbent materials. : Nanotechnology and its applications have been developed in most branches of science and technology. Extensive studies have been conducted to remove heavy metal ions from wastewater by preparation and applications of various nanomaterials. Nanomaterials offer advantages in comparison to other materials including an extremely high specific surface area, low-temperature modification, short intraparticle diffusion distance, numerous associated sorption sites, tunable surface chemistry, and pore size. In order to evaluate an adsorbent, two key parameters are: the adsorption capacity and the desorption property. The adsorption parameters including the absorbent loading, pH and temperature, concentration of heavy metal ion, ionic strength, and competition among metal ions are often studied and optimized. : Several reviews have been published on the application of Graphene (G), Graphene Oxide (GO) in water treatment. In this minireview, we attempted to summarize the recent research advances in water treatment and remediation process by graphene-based materials and provide intensive knowledge of the removal of pollutants in batch and flow systems. Finally, future applicability perspectives are offered to encourage more interesting developments in this promising field. This minireview does not include patent literature.

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