Two–three parameters isotherm modeling, kinetics with statistical validity, desorption and thermodynamic studies of adsorption of Cu(II) ions onto zerovalent iron nanoparticles

AbstractAdsorption of problematic copper ions as one of the endocrine disruptive substances from aqueous solution onto nanoscale zerovalent iron (nZVI) was studied. The high pore size 186.9268 Å, pore diameter 240.753 Å, and BET surface area 20.8643 m2 g−1 and pH(pzc) enlisted nZVI as an efficient nano-adsorbent for treatment of heavy metals from synthetic wastewater. SEM and EDX revealed the morphology and elemental distribution before and after adsorption. 98.31% removal efficiency was achieved at optimum adsorption operational parameters. Of all the thirteen isotherm models, equilibrium data were well fitted to Langmuir. Kinetics and mechanism data across the concentrations from 10 to 200 mg L−1 were analyzed by ten models. PSO best described kinetics data as confirmed by various statistical error validity models. The intraparticle diffusion model described that the intraparticle diffusion was not the only rate-limiting step. The adsorption mechanism was diffusion governed established by Bangham and Boyd models. Feasible, spontaneous, endothermic, and degree of randomness were reveal by the thermodynamic studies. Better desorption index and efficiency were obtained using HCl suggesting multiple mechanism processes. The performance of ZVI suggested it has a great potential for effective removal of endocrine disruptive cationic contaminant from wastewater.

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Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

Materials ◽

10.3390/ma14010063 ◽

2020 ◽

Vol 14 (1) ◽

pp. 63

Author(s):

Maria Harja ◽

Gabriela Buema ◽

Nicoleta Lupu ◽

Horia Chiriac ◽

Dumitru Daniel Herea ◽

...

Keyword(s):

Fly Ash ◽

Adsorption Capacity ◽

Copper Ions ◽

Synthetic Wastewater ◽

Bet Surface Area ◽

Isotherm Models ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Copper Adsorption ◽

X Ray

Fly ash/magnetite material was used for the adsorption of copper ions from synthetic wastewater. The obtained material was characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) surface area, and vibrating sample magnetometer (VSM). Batch adsorption experiments were employed in order to investigate the effects of adsorbent dose, initial Cu (II) concentration and contact time over adsorption efficiency. The experimental isotherms were modeled using Langmuir (four types of its linearization), Freundlich, Temkin, and Harkins–Jura isotherm models. The fits of the results are estimated according to the Langmuir isotherm, with a maximum adsorption capacity of 17.39 mg/g. The pseudo-second-order model was able to describe kinetic results. The data obtained throughout the study prove that this novel material represents a potential low-cost adsorbent for copper adsorption with improved adsorption capacity and magnetic separation capability compared with raw fly ash.

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Interaction of Aqueous Cu2+ Ions with Granules of Crushed Concrete

Iraqi Journal of Chemical and Petroleum Engineering ◽

10.31699/ijcpe.2019.1.5 ◽

2019 ◽

Vol 20 (1) ◽

pp. 31-38 ◽

Cited By ~ 1

Author(s):

Alyaa F. Ali ◽

Ziad T. Abd Ali

Keyword(s):

Aqueous Solution ◽

Copper Ions ◽

Synthetic Wastewater ◽

Isotherm Models ◽

Batch Experiments ◽

Demolition Waste ◽

Particle Size Range ◽

Sorption Data ◽

Surface Precipitation ◽

Crushed Concrete

The sorption of Cu2+ ions from synthetic wastewater using crushed concrete demolition waste (CCDW) which collected from a demolition site was investigated in a batch sorption system. Factors inﬂuencing on sorption process such as shaking time (0-300min), the initial concentration of contaminant (100-750mg/L), shaking speed (0-250 rpm), and adsorbent dosage (0.05-3 g/ml) have been studied. Batch experiments confirmed that the best values of these parameters were (180 min, 100 mg/l, 250 rpm, 0.7 g CCDW/100 ml) respectively where the achieved removal efficiency is equal to 100%. Sorption data were described using four isotherm models (Langmuir, Freundlich, Redlich-Peterson, and Radke-Prausnitz). Results proved that the pure adsorption and precipitation are the main mechanisms for removal of copper ions from aqueous solution onto CCDW and sorption data can be represented by Langmuir and Radke-Prausnitz model. The copper ion was successfully removed from aqueous solution during batch experiments using CCDW in the particle size range 2–1 mm. Scanning electron microscopy detected that the removal of Cu2+ was found to arise from surface precipitation.

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Removal of Lead Ions from Waste Water Using Modified Jordanian Zeolite

Chemical Science International Journal ◽

10.9734/csji/2020/v29i830197 ◽

2020 ◽

pp. 19-30

Author(s):

Hutaf M. Baker

Keyword(s):

Sodium Dodecyl Sulfate ◽

Sodium Dodecyl ◽

Intraparticle Diffusion ◽

Second Order ◽

Lead Ions ◽

Synthetic Wastewater ◽

Isotherm Models ◽

Intraparticle Diffusion Model ◽

Dodecyl Sulfate ◽

Pseudo Second Order

In this study a Jordanian Zeolite was modified using anionic surfactant which is sodium dodecyl sulfate (sodium dodecyl sulfate). The sorption of Pb(II) from synthetic wastewater by surfactant modified Zeolite (SMZ) was investigated as a function of temperature. The experimental data was analysed using isotherm models namely Langmuir, Freundlich, Redlich-Peterson and Temkin and kinetic models such as the pseudo- second-order, intraparticle diffusion and the Elovich models in order to understand the mechanism of the interaction between this SMZ and the lead ions. All the isotherm models showed good correlation with the experimental results but Freundlich was the best. The calculated DH was obtained using Langmuir constant (aL), its value of 8.29kJ/mol revealed that the type of sorption is physical oneThe values of RL at all temperatures reflect the favorability of this interaction. The calculated activation energy was 21.126 kJ/mol using the pseudo-second order constant (k2), which indicates that the sorption is physisorption. The intraparticle diffusion model showed multilinearity which means multiple stages there occurred to achieve the removal of lead ions, the first linear curve is due to the boundary layer diffusion and the second linear curve isfor the intraparticle diffusion effect. The adsorption kinetics data fitted also Elovich model.

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Using of Sukary and Khlass Date Pits as a Bio-adsorbents for Adsorption of Lead and Copper Ions from Waste Water

Oriental Journal Of Chemistry ◽

10.13005/ojc/370206 ◽

2021 ◽

Vol 37 (2) ◽

pp. 302-307

Author(s):

Abdulrahman G. Alhamzan

Keyword(s):

Adsorption Capacity ◽

Room Temperature ◽

Copper Ions ◽

Phoenix Dactylifera ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Palm Trees ◽

Phoenix Dactylifera L ◽

Temperature Equilibrium ◽

Date Pits

In this study date pits of two types of date-palm trees (Phoenix Dactylifera L.), in Saudi Arabia were used as bio-sorbents for heavy metals (e.g. lead and copper) from aqueous solutions. Investigation of equilibrium time and the effect of different concentrations of metals were performed. Adsorption capacity of bio-sorbents increased when increasing concentration of metal ions. Maximum adsorption capacity at room temperature of Sukary date pits was 17.53 mg g-1 and 9.86 mg g-1 for lead and copper ions, respectively. Whereas, Khlass date pits showed maximum adsorption capacity at 14.1 mg g-1 and 7.91 mg g-1 for lead and copper ions, respectively at room temperature. Equilibrium isotherm models, (Langmuir and Freundlich models), were used for analysis of equilibrium experimental results. these models describe the experimental data well.

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Effective Removal of Malachite Green from Aqueous Solutions Using Magnetic Nanocomposite: Synthesis, Characterization, and Equilibrium Study

Adsorption Science & Technology ◽

10.1155/2021/2359110 ◽

2021 ◽

Vol 2021 ◽

pp. 1-15

Author(s):

Ali Q. Alorabi

Keyword(s):

Surface Area ◽

Malachite Green ◽

Chemical Activation ◽

Aqueous Media ◽

Kinetic Studies ◽

Cost Effective ◽

Magnetic Nanocomposite ◽

Bet Surface Area ◽

Isotherm Models ◽

Order Kinetic

In this work, magnetized activated Juniperus procera leaves (Fe3O4@AJPL) were successfully prepared via chemical activation of JPL and in situ coprecipitation with Fe3O4. A Fe3O4@AJPL nanocomposite was successfully applied for the elimination of malachite green (MG) dye from aqueous media. The prepared Fe3O4@AJPL adsorbent was characterized by SEM, EDX, TEM, XRD, FTIR, TGA, and BET surface area analyses. The BET surface area and pore size of the Fe3O4@AJPL nanocomposite were found to be 38.44 m2/g and 10.6 nm, respectively. The XRD and FTIR results indicated the formation of a Fe3O4@AJPL nanocomposite. Different parameters, such as pH of the solution (3–8), adsorbent dosage (10–100 mg), temperature (25–45°C), contact time (5-240 min), and initial MG concentrations (20–350 mg/L), for the elimination of the MG dye using Fe3O4@AJPL were optimized and found to be 7, 50 mg, 45°C, 120 min, and 150 mg/L, respectively. The nonlinear isotherm and kinetic studies exhibited a better fitting to second-order kinetic and Langmuir isotherm models, with a maximum monolayer adsorption capacity of 318.3 mg/g at 45°C, which was highly superior to the previously reported magnetic nanocomposite adsorbents. EDX analyses confirmed the presence of nitrogen on the Fe3O4@AJPL surface after MG adsorption. The calculated thermodynamic factors indicated endothermic and spontaneous processes. The desorption of MG dye from Fe3O4@AJPL was performed using a solution of 90% ethanol. Finally, it could be concluded that the designed Fe3O4@AJPL magnetic nanocomposite will be a cost-effective and promising adsorbent for the elimination of MG from aqueous media.

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Utilization of galactomannan from spent coffee grounds as coagulant aid to treat synthetic Congo red wastewater

10.21203/rs.3.rs-497538/v1 ◽

2021 ◽

Author(s):

Hans Kristianto ◽

Sekar Astari Saraswati ◽

Susiana Prasetyo ◽

Asaf K Sugih

Keyword(s):

Congo Red ◽

Synthetic Wastewater ◽

Isotherm Models ◽

Spent Coffee Grounds ◽

Adsorption Study ◽

Natural Coagulant ◽

Coffee Grounds ◽

Bet Isotherm ◽

Inorganic Chemical ◽

Promising Source

Abstract Over the last few years, there is a significant growth in research exploring natural based coagulant due to its various benefits to decrease or even substitute the usage of inorganic chemical coagulants. Polysaccharide based coagulant and coagulant aid is a promising source for this purpose, due to its abundance. In this study, we reported utilization of galactomannan extracted from spent coffee grounds as natural coagulant aid in coagulation of Congo red synthetic wastewater. The coagulation was done at fixed dosage of FeCl3 (160 mg/L) and pH of 6. The effect of galactomannan as coagulant aid was observed by varying galactomannan dosage (0-140 mg/L) and Congo red concentration (20–70 mg/L). It was found that galactomannan as coagulant aid could increase the removal of Congo red, around 30–90% removal, depends on Congo red concentration, compared FeCl3 only (0–65%). The coagulation adsorption study was also investigated using Langmuir, Freundlich, and Brunauer – Emmet – Teller (BET) isotherm models. It was found that Congo red coagulation using FeCl3 only was following Langmuir isotherm, indicating monolayer – homogenous formation during the coagulation. On the other hand, with the presence of galactomannan the coagulation was best described by BET isotherm, indicating multilayer – heterogeneous adsorption, possibly due to interparticle bridging of galactomannan during colloid aggregation. The findings in this study suggest synergistic effect of galactomannan and FeCl3 in the coagulation process and proved potential of galactomannan from spent coffee grounds as natural coagulant aid.

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Cadmium Removal by using Pumice Modified with Iron Nanoparticles from Aqueous Solutions

Global NEST Journal ◽

10.30955/gnj.001854 ◽

2016 ◽

Vol 18 (2) ◽

pp. 426-436 ◽

Cited By ~ 3

Keyword(s):

Contact Time ◽

Iron Nanoparticles ◽

Cadmium Concentration ◽

Synthetic Wastewater ◽

Isotherm Models ◽

Cadmium Removal ◽

Pumice Stone ◽

Practical Applications ◽

Equilibrium Data ◽

Adsorbent Dose

In this study, the removal of cadmium by using pumice coated with iron nanoparticles (INPs) from synthetic wastewater was investigated. The effects of parameters influencing adsorption: contact time (10-20 min), pH (3-9), initial cadmium concentration (25-125 mg l-1) and adsorbent dose (2-10 g l-1) were studied. The pumice stone used in this research was, first, crashed and then sieved with 20 mesh standard sieves (0.85 mm); finally, it was coated with INPs. An atomic absorption spectrophotometer was used to measure cadmium contents and isotherm models and adsorption kinetics were studied. The results showed the adsorption process of cadmium reached equilibrium at contact time of 80 min. With increasing pH solution, the efficiency enhanced which peaked at pH 7-8. Cadmium concentration increase resulted in a decrease in efficiency, whereas adsorbent dose increase improved it. Equilibrium data of adsorption followed isotherms models: Langmuir and Freundlich. The highest removal efficiency and adsorption capacity were, respectively, 83% and 17.27 mg g-1. Furthermore, absorption kinetics is better described by the pseudo second-order model. According to the results obtained, pumice coated with INPs is an effective adsorbent and can be introduced as a suitable option in practical applications

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Biosorption of Pb2+ and Cd2+ from Simulated Wastewater Using Melina (Gmelina arborea) Tree Leaves Powder

Asian Journal of Applied Chemistry Research ◽

10.9734/ajacr/2018/v2i19595 ◽

2018 ◽

pp. 1-12

Author(s):

N. O. Ilelaboye ◽

A. A. Oderinde

Keyword(s):

Metal Ions ◽

Waste Treatment ◽

Anthropogenic Activities ◽

Freundlich Isotherm ◽

Solution Concentration ◽

Isotherm Models ◽

Operational Parameters ◽

Solution Ph ◽

Separation Parameter ◽

Optimum Solution

Increased anthropogenic activities have led to serious environmental problems due to pollution caused by toxic materials such as heavy metals whose levels are rising in the environment. The inefficiency and high cost of conventional methods of waste treatment have prompted the investigation of environmentally friendly and cheaper methods of treatment using natural products. In this study, G. arborea leaves powder was investigated with a view of using it as cheap material for the biosorption of Pb2+ and Cd2+ from wastewater. The effects of operational parameters like pH, biosorbent dose [g/L], initial metal ions concentration [mg/L], contact time [minutes] and stirring speed [rpm] on the biosorption efficiency [%] were determined. The optimum solution pH for Pb2+ and Cd2+adsorption was 5.0 and peak adsorption of 91.33% and 82.53% for Pb2+ and Cd2+, respectively. 5 g/L Melina leaves were enough to achieve peak removal of both metal ions. The removal of the metal ions was comparatively quick, and stability was achieved after 30 minutes. The optimum stirring speed was 250 rpm for both metal ions. The uptake efficiency of the biosorbent was determined by Langmuir and Freundlich isotherm models. The value of Langmuir isotherm separation parameter [RL] of Pb2+ ion [0.0446 - 0.78125] and Cd2+ [0.1005- 0.9482] were within range of 0 -1 indicating favorable biosorption for both metal ions. The degree of non-linearity [n] values between Pb2+ [12.79] and Cd2+ [11.79] solution concentration and biosorption in Freundlich equation were greater than 1, indicating physical biosorption of Pb2+ and Cd2+ on to G. arborea leaves. G. arborea can serve as efficient biosorbent not only for Pb2+ and Cd2+ ions but also for other heavy metal ions in a wastewater stream

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Effect of Temperature on the Physical, Electro-Chemical and Adsorption Properties of Carbon Micro-Spheres Using Hydrothermal Carbonization Process

Nanomaterials ◽

10.3390/nano8080597 ◽

2018 ◽

Vol 8 (8) ◽

pp. 597 ◽

Cited By ~ 8

Author(s):

Zaira Chowdhury ◽

Bagavathi Krishnan ◽

Suresh Sagadevan ◽

Rahman Rafique ◽

Nor Hamizi ◽

...

Keyword(s):

Hydrothermal Carbonization ◽

Xrd Analysis ◽

Adsorption Properties ◽

Bet Surface Area ◽

Effect Of Temperature ◽

Isotherm Models ◽

Equilibrium System ◽

Fruit Peel ◽

Spherical Carbon ◽

Dimocarpus Longan

This research deals with the effect of the temperature on the physical, thermal, electrochemical, and adsorption properties of the carbon micro-spheres using hydrothermal carbonization (HTC). Until recently, limited research has been conducted regarding the effects of delignification during the HTC process of biomass residues especially Dimocarpus longan. In this regard, lignin was first extracted from the lingo-cellulosic waste of Longan fruit peel (Dimocarpus longan). The holocellulose (HC) separated from lignin and raw biomass substrates (Longan fruit exocarp/peel powder, LFP) were carbonized at different temperatures using water as the green catalyst. Hydrothermal carbonization (HTC) was performed for both of the samples (LFP and HC) at 200 °C, 250 °C, and 300 °C for 24 h each. The surface morphological structures, the porosity, and the Brunauer-Emmett-Teller (BET) surface area of the prepared micro-spherical carbon were determined. The BET surface areas obtained for HC-based carbon samples were lower than that of the raw LFP based carbon samples. The carbon obtained was characterized using ultimate and proximate analyses. The surface morphological features and phase transformation of the synthesized micro-spherical carbon was characterized by a field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) analysis. The results demonstrated that the extraction of lignin could significantly alter the end properties of the synthesized carbon sample. The carbon spheres derived from LFP showed a higher carbon content than the HC-based carbon. The absence of lignin in the holo-cellulose (HC) made it easy to disintegrate in comparison to the raw, LFP-based carbon samples during the HTC process. The carbonaceous samples (LFP-300 and HC-300) prepared at 300 °C were selected and their adsorption performance for Pb (II) cations was observed using Langmuir, Freundlich, and Temkin linear isotherm models. At 30 °C, the equilibrium data followed the Langmuir isotherm model more than the Freundlich and Temkin model for both the LFP-300 sample and the HC-300 sample. The potential of the synthesized carbon microspheres were further analyzed by thermodynamic characterizations of the adsorption equilibrium system.

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Synthesis of New Cyclodextrin-Based Adsorbents to Remove Direct Red 83:1

Polymers ◽

10.3390/polym12091880 ◽

2020 ◽

Vol 12 (9) ◽

pp. 1880

Author(s):

José A. Pellicer ◽

María Isabel Rodríguez-López ◽

María Isabel Fortea ◽

Vicente M. Gómez-López ◽

David Auñón ◽

...

Keyword(s):

Room Temperature ◽

Advanced Oxidation Process ◽

Oxidation Process ◽

Freundlich Isotherm ◽

Intraparticle Diffusion ◽

Isotherm Models ◽

Intraparticle Diffusion Model ◽

Pseudo Second Order ◽

Physical Interactions ◽

Resonance Particle

Two cyclodextrins (CDs), γ– and hydroxypropyl (HP)–γ–CDs were used to synthesize new adsorbents by using epichlorohydrin (EPI) as cross-linking agent in order to remove Direct Red 83:1 (DR) from water. Both polymers were characterized in terms of Fourier spectroscopy, nuclear magnetic resonance, particle size distribution and thermogravimetric analysis. Experimental data for both polymers were well fitted to the pseudo-second order and intraparticle diffusion model, indicating that in the adsorption both chemical and physical interactions are essential in the removal of DR. Three different isotherm models were analyzed, concluding that γ–CDs–EPI followed the Temkin isotherm and HP–γ–CDs-EPI the Freundlich isotherm, these results suggested that the adsorption was happening onto heterogeneous surfaces. The results of the Gibbs free energy showed that the adsorption was spontaneous at room temperature. In order to eliminate the remaining dye after the polymer treatment, and advanced oxidation process (AOP) was considered, achieving more than 90% of removal combining both mechanisms.

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