A review on geopolymers as emerging materials for the adsorption of heavy metals and dyes

Siyal, Ahmer Ali; Shamsuddin, Rashid; Khan, Muhammad Irfan; Rabat, Nurul Ekmi; Zulfiqar, Muhammad; Man, Zakaria; Siame, John; Azizli, Khairun Azizi Mohd

doi:10.1016/j.jenvman.2018.07.046

Cited by 335 publications

(144 citation statements)

References 93 publications

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“…The reaction kinetics analysis provides deep and excellent information about the mechanism and rate of desired adsorption process [4,54]. To understand the reaction kinetic mechanism for the adsorption of Pb(II) on the OPB/MWCNTs reinforced hydrogels, pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic models were used to investigate the experimental results [55,56].…”

Section: Adsorption Kinetic Studiesmentioning

confidence: 99%

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

et al. 2020

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Polyvinyl alcohol (PVA) hydrogel are still restricted for some applications because their lower mechanical strength and thermal stability. The PVA-based composites are drawing attention for the removal of heavy metals based on their specific functionality in adsorption process. The main objective of this work is to synthesize oil palm bio-waste (OPB)/multiwalled carbon nanotubes (MWCNTs) reinforced PVA hydrogels in the presence of N,N′-methylenebisacrylamide (NMBA) as a crosslinking agent and ammonium persulfate (APS) as an initiator via simple in-situ polymerization technique. The as-prepared reinforced nanocomposites were characterized by FESEM, BET surface area, differential scanning calorimetry (DSC), TGA and FTIR analysis. The possible influence of OPB and MWCNTs on the tensile strength, elongation at break and elastic modulus of the samples were investigated. It was found that reinforced nanocomposites exhibited enhanced mechanical properties as compared to non-reinforced material. The evaluation of reinforced nanocomposites was tested by the removal of Pb(II) aqueous solutions in a batch adsorption system. The pseudo-second-order kinetic model was used to illustrate the adsorption kinetic results and Langmuir isotherm was more suitable to fit the equilibrium results providing maximum adsorption capacities. The evaluation of thermodynamic parameters describes the spontaneous, endothermic and chemisorption adsorption process while activation energy reveals the physical adsorption mechanism. Therefore, the coordination effects among OPB, MWCNTs and PVA polymer hydrogels can produce a promising adsorbent material for wastewater treatment applications.

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Section: Adsorption Kinetic Studiesmentioning

confidence: 99%

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

et al. 2020

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“…Therefore, the contaminant removal of aquatic environment has been a difficult challenge. Several processes have been applied and evaluated as an attempt to zinc removal of wastewater and drinking water, such as membrane filtration, ionic change and precipitation process, flotation and reverse osmosis, electrochemical processes, coagulation and adsorption 10,11 . However, these processes show limitations due to technical and economic constraints 12 .…”

Section: Introductionmentioning

confidence: 99%

Fe3O4@C core-shell nanoparticles as adsorbent of ionic zinc: evaluating of the adsorptive capacity

et al. 2019

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Zinc is an important chemical element in many metabolic mechanisms at low concentrations, but can be toxic when administrated in doses higher than 500 µg•g-1 or 3 mg•L-1. This metal has been detected in many aquatic environments due to several industry activities and swine manure effluents. Thus, the contaminant removal of water and wastewater has been a major challenge. Many processes are applied and evaluated in an attempt to removal zinc found in environment, such as adsorption. In the present study Fe 3 O 4 @C core-shell nanoparticles were synthesized and used to adsorb ionic zinc species in aqueous solutions. The core-shell nanoparticles exhibited excellent zinc removal capacity, with a maximum efficiency equal 65% where applied in an aqueous solution containing 10 mg•l-1 of this ionic metal.

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“…The discharge of these result in serious water pollution and deterioration. The non-biodegradable nature of metals of toxicological concerns results in their bioaccumulation both in the environment and humans hence, causes serious health challenges (Meng et al, 2018;Siyal et al, 2018). For instance, copper which is regularly released from various industrial activities including smelting, fertilizer, electroplating, mining and other metal finishing industries, petrochemical and electrical cable productions could have various health effects on human.…”

Section: Introductionmentioning

confidence: 99%

Copper scavenging efficiency of adsorbents prepared from Raphia hookeri fruit waste

Inyinbor

Adekola

Olatunji

2019

Sustainable Chemistry and Pharmacy

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Low cost adsorbents prepared from the epicarp of Raphia hookeri fruit were used for the removal of copper (II) ion from aqueous solution. The effects of operational parameters such as pH, concentration and contact time, dosage as well as interference of other ions were studied. Optimum pH for raw and modified biomass were 5.0 and 5.5 with percentage removal of 75.08% and 95.62% respectively. Concentration of competing ions greatly reduced Cu 2+ removal with both adsorbents while agitation speed had negligible effect on Cu 2+ uptake. Adsorbents surfaces were activated as temperature increased thus enhancing adsorbent adsorption capacity at high temperature. Adsorption kinetic data fitted best into the pseudo second order model while the thermodynamics studies confirmed adsorption spontaneity and feasibility. The Freundlich adsorption isotherm best described the adsorption process and the Langmuir maximum monolayer adsorption capacity for the raw (RHE) and acid treated (ARHE) biomass were 81.97 and 103.09 mg/g respectively. Chemisorption predominate the Cu 2+ -ARHE system hence desorption efficiency was obtained to be 72.65% with CH 3 COOH as eluent.

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A review on geopolymers as emerging materials for the adsorption of heavy metals and dyes

Cited by 335 publications

References 93 publications

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

Efficient Removal of Pb(II) from Aqueous Solutions by Using Oil Palm Bio-Waste/MWCNTs Reinforced PVA Hydrogel Composites: Kinetic, Isotherm and Thermodynamic Modeling

Fe3O4@C core-shell nanoparticles as adsorbent of ionic zinc: evaluating of the adsorptive capacity

Copper scavenging efficiency of adsorbents prepared from Raphia hookeri fruit waste

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