A New Perspective on Adsorbent Materials Based Impregnated MgSiO3 with Crown Ethers for Palladium Recovery

The study of new useful, efficient and selective structures for the palladium ions’ recovery has led to the development of a new series of macromolecules. Thus, this study presents a comparative behavior of two crown benzene ethers that modify the magnesium silicate surface used as adsorbent for palladium. These crown ethers are dibenzo18-crown-6 (DB18C6) and dibenzo 30-crown-10 (DB30C10). The obtained materials were characterized by scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX) and Fourier-transform infrared spectroscopy (FT-IR). The specific surface area (BET) and point of zero charge (PZC) of the two materials were determined. The palladium ions’ recovery from synthetic aqueous solutions studies aimed to establish the adsorption mechanism. For this desideratum, the kinetic, equilibrium and thermodynamic studies show that MgSiO3-DB30C10 have a higher adsorption capacity (35.68 mg g−1) compared to MgSiO3-DB18C6 (21.65 mg g−1). Thermodynamic studies highlight that the adsorption of Pd(II) on the two studied materials are spontaneous and endothermic processes. The positive values of the entropy (ΔS0) suggest that the studied adsorption processes show a higher disorder at the liquid/solid interface. Desorption studies were also performed, and it was found that the degree of desorption was 98.3%.

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Kinetic, Equilibrium and Thermodynamic studies on the removal of Cr(VI) by activated carbon prepared from Cajanus Cajan(L) Milsp seed shell

Polish Journal of Chemical Technology ◽

10.2478/v10026-011-0041-6 ◽

2011 ◽

Vol 13 (4) ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

P. Thamilarasu ◽

G. Kumar ◽

R. Tamilarasan ◽

V. Sivakumar ◽

K. Karunakaran

Keyword(s):

Activated Carbon ◽

Cajanus Cajan ◽

Low Cost ◽

Freundlich Isotherm ◽

Batch Adsorption ◽

Thermodynamic Studies ◽

Chromium Vi ◽

Before And After ◽

Ft Ir ◽

Kinetic Equilibrium

Kinetic, Equilibrium and Thermodynamic studies on the removal of Cr(VI) by activated carbon prepared from Cajanus Cajan(L) Milsp seed shell This paper presents the feasibility of the removal of hexavalent chromium ions from aqueous solutions by using activated carbon prepared from Cajanus Cajan(L) Milsp. It was carbonized and activated by treating it with concentrated sulfuric acid followed by heating for 5 h at 500°C. Batch adsorption experiments were carried out as a function of pH, contact time, initial concentration of the adsorbate, adsorbent dosage and temperature. The experimental data fitted well to the Freundlich isotherm. The thermodynamic parameters such as ΔH°, ΔS°, and ΔG° were calculated, which indicated that the adsorption was spontaneous and endothermic in nature. The adsorbent used in this study was characterized by FT-IR and SEM before and after the adsorption of metal ions. The results indicate that Cajanus Cajan(L) Milsp can be employed as a low cost alternative and commercial adsorbents in the removal of chromium (VI) from water and waste water.

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Removal of phenol and 4-nitrophenol from wastewater using a composite prepared from clay and Cocos nucifera shell: Kinetic, equilibrium and thermodynamic studies

Resources, Environment and Sustainability ◽

10.1016/j.resenv.2021.100020 ◽

2021 ◽

Vol 3 ◽

pp. 100020

Author(s):

Matthew A. Adebayo ◽

Felicia I. Areo

Keyword(s):

Cocos Nucifera ◽

Thermodynamic Studies ◽

Kinetic Equilibrium

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Congo Red removal using Fesdis soil: kinetic, equilibrium and thermodynamic studies

International Journal of Environmental & Analytical Chemistry ◽

10.1080/03067319.2021.1910246 ◽

2021 ◽

pp. 1-21

Author(s):

Assia Chaib ◽

Noura Boukhalfa ◽

Amel Boudjemaa

Keyword(s):

Congo Red ◽

Thermodynamic Studies ◽

Kinetic Equilibrium

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Removal of Chromium(III) and Cadmium(II) Heavy Metal Ions from Aqueous Solutions Using Treated Date Seeds: An Eco-Friendly Method

Molecules ◽

10.3390/molecules26123718 ◽

2021 ◽

Vol 26 (12) ◽

pp. 3718

Author(s):

Mohammad Azam ◽

Saikh Mohammad Wabaidur ◽

Mohammad Rizwan Khan ◽

Saud I. Al-Resayes ◽

Mohammad Shahidul Islam

Keyword(s):

Metal Ions ◽

Adsorption Capacity ◽

Low Cost ◽

Maximum Adsorption Capacity ◽

Solution Ph ◽

Surface Analysis Techniques ◽

Adsorption Processes ◽

Ft Ir ◽

Metal Elution ◽

Date Pits

The aim of the research was to prepare low-cost adsorbents, including raw date pits and chemically treated date pits, and to apply these materials to investigate the adsorption behavior of Cr(III) and Cd(II) ions from wastewater. The prepared materials were characterized using SEM, FT-IR and BET surface analysis techniques for investigating the surface morphology, particle size, pore size and surface functionalities of the materials. A series of adsorption processes was conducted in a batch system and optimized by investigating various parameters such as solution pH, contact time, initial metal concentrations and adsorbent dosage. The optimum pH for achieving maximum adsorption capacity was found to be approximately 7.8. The determination of metal ions was conducted using atomic adsorption spectrometry. The experimental results were fitted using isotherm Langmuir and Freundlich equations, and maximum monolayer adsorption capacities for Cr(III) and Cd(II) at 323 K were 1428.5 and 1302.0 mg/g (treated majdool date pits adsorbent) and 1228.5 and 1182.0 mg/g (treated sagai date pits adsorbent), respectively. It was found that the adsorption capacity of H2O2-treated date pits was higher than that of untreated DP. Recovery studies showed maximal metal elution with 0.1 M HCl for all the adsorbents. An 83.3–88.2% and 81.8–86.8% drop in Cr(III) and Cd(II) adsorption, respectively, were found after the five regeneration cycles. The results showed that the Langmuir model gave slightly better results than the Freundlich model for the untreated and treated date pits. Hence, the results demonstrated that the prepared materials could be a low-cost and eco-friendly choice for the remediation of Cr(III) and Cd(II) contaminants from an aqueous solution.

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Evaluating the adsorption of Shanghai silty clay to Cd(II), Pb(II), As(V), and Cr(VI): kinetic, equilibrium, and thermodynamic studies

Environmental Monitoring and Assessment ◽

10.1007/s10661-021-08904-7 ◽

2021 ◽

Vol 193 (3) ◽

Author(s):

Jinxin Wang ◽

Wenjie Zhang

Keyword(s):

Silty Clay ◽

Thermodynamic Studies ◽

Kinetic Equilibrium

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Efficient remediation of Zr(IV) using citrus peel waste biomass: Kinetic, equilibrium and thermodynamic studies

Ecological Engineering ◽

10.1016/j.ecoleng.2016.06.087 ◽

2016 ◽

Vol 95 ◽

pp. 216-228 ◽

Cited By ~ 32

Author(s):

Haq Nawaz Bhatti ◽

Qamar Zaman ◽

Abida Kausar ◽

Saima Noreen ◽

Munawar Iqbal

Keyword(s):

Waste Biomass ◽

Citrus Peel ◽

Thermodynamic Studies ◽

Kinetic Equilibrium

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Preparation of xanthated bentonite and its removal behavior for Pb(II) ions

Water Science & Technology ◽

10.2166/wst.2010.013 ◽

2010 ◽

Vol 61 (5) ◽

pp. 1235-1243 ◽

Cited By ~ 4

Author(s):

Y. F. He ◽

F. R. Li ◽

R. M. Wang ◽

F. Y. Li ◽

Y. Wang ◽

...

Keyword(s):

Adsorption Mechanism ◽

Removal Rate ◽

Freundlich Isotherm ◽

Particle Size Analysis ◽

Lead Ions ◽

Size Analysis ◽

Optimum Conditions ◽

X Ray Diffraction ◽

X Ray ◽

Ft Ir

Xanthate was successfully grafted onto bentonite by a relatively simple solution reaction. The obtained xanthated bentonite (XBent) was characterized by FT-IR spectrophotometer, thermogravimetric analysis (TG), particle size analysis, x-ray diffraction (XRD) and scanning electron microscopy (SEM). XBent acting as a type of environmentally friendly adsorbent was applied to remove lead ions from aqueous solutions. The optimum conditions were as follows: [Pb2 + ] = 500 mg L−1, [XBent] = 2 g L−1, pH = 5.0; oscillating 60 min under 200 rpm at 25°C. The removal rate of lead was up to 99.9%. It was found that the lead(II) ions—XBent adsorption isotherm model fitted well to the Freundlich isotherm. The adsorption mechanism was also investigated by SEM and XRD, which concluded that lead ions were complexed or chelated with XBent. XBent appears to have potential to be used later in water treatment as a type of inorganic polymer reagent.

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