The preparation of calcium phosphate adsorbent from natural calcium resource and its application for copper ion removal

AbstractUsing the hen eggshells (biowaste) as a source of calcium and an environmentally friendly approach, the nanopowder composed of 74% of hydroxyapatite (HA) and 26% of β–tricalcium phosphate (β-TCP) was obtained. Due to the maximum reduction of the stages associated with the use of chemicals and energy, this method can be considered as economically and environmentally friendly. A well-developed surface area and the negative zeta potential at pH above 3.5 indicate good adsorption properties of this material. The obtained material shows high adsorption capacity towards Cu2+ ions, i.e. 105.4 mg/g at pH 5. Good fit of the Langmuir adsorption model and the pseudo-second-order kinetic model may indicate chemical adsorption probably due to the electrostatic interactions between the Cu2+ cations and the negatively charged phosphate and hydroxyl groups on the material surface.

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Optimization of cadmium(II) adsorption onto modified and unmodified lignocellulosics (rice husk and egussi peeling)

International Journal of Basic and Applied Sciences ◽

10.14419/ijbas.v5i1.5195 ◽

2015 ◽

Vol 5 (1) ◽

pp. 45

Author(s):

Tchuifon Tchuifon Donald Raoul ◽

Nche George Ndifor-Angwafor ◽

Ngakou Sadeu Christian ◽

Kamgaing Théophile ◽

Ngomo Horace Manga ◽

...

Keyword(s):

Adsorption Capacity ◽

Rice Husk ◽

Order Kinetic ◽

Adsorption Model ◽

Batch Technique ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Adsorbed Quantity ◽

Minimal Mass ◽

Modified Adsorbents

The present study is based on the adsorption of cadmium (II) ions on rice husk and egussi peeling, unmodified and modified with nitric acid in aqueous solution, using batch technique. It was carried out as a function of contact time, dosage, pH and initial concentration. The equilibrium time was achieved within 25 minutes for unmodified rice husk (Glu NT) and 20 minutes for unmodified egussi peeling (Cuc NT) with an adsorbed quantity of 13.18 mg/g. In the case of modified materials, we obtained 15 minutes for modified rice husk (Glu HNO3) and 10 minutes for modified egussi peeling (Cuc HNO3) with an adsorbed quantity of 18.77 mg/g. The maximum biosorption occurred at pH 5.5 for all biosorbents. The adsorbent mass for maximum adsorption was 0.4 g giving an adsorption capacity of 62.02 % for unmodified adsorbents. In the case of modified adsorbents, the minimal mass at which maximum adsorption occurred was 0.4 g giving an adsorption capacity of 98.33 % and 0.6 g giving an adsorption capacity of 98.33 % for modified rice husk and egussi peeling respectively. The adsorbent/adsorbate equilibrium was well described by the pseudo-second order kinetic model and by Langmuir’s and Freundlich adsorption model. This models showed that the adsorption of cadmium (II) is a chemisorption process.

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Preparation of side chain liquid crystal polyether chelating resin and its adsorption properties for Cu2+ in water

10.21203/rs.3.rs-192767/v1 ◽

2021 ◽

Author(s):

Chaoyi Qian ◽

Meng Li ◽

Shuang Wang ◽

Qing Gao ◽

Huaiwei Yao ◽

...

Keyword(s):

Liquid Crystal ◽

Influence Factors ◽

Chelating Resin ◽

Side Chain ◽

Order Kinetic ◽

Adsorption Model ◽

Order Kinetic Model ◽

Group A ◽

New Type ◽

Cationic Ring Opening Polymerization

Abstract With epoxycyclohexane as critical modifying monomer, the copolyether was obtained by cationic ring-opening polymerization of epichlorohydrin and epoxycyclohexane. Then biphenyl was used as the mesogen, and diglycolamidic acid was used as the terminal chelating group, a new type of side chain liquid crystal polyether chelating resin was prepared at last. The adsorption influence factors, reuse performance, adsorption model and adsorption kinetics of the chelated resin on Cu 2+ in water were studied systematically. The results showed that the resin has good adsorption and reuse performance for the treatment of Cu 2+ in water, and the adsorption of Cu 2+ is Langmuir monolayer adsorption, and the adsorption process conforms to a quasi-second-order kinetic model. The adsorption performances of the chelated resin has great potential for recovery of copper resource from non-ferrous smelting industry.

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Gold Recovery from Aqueous Solutions Using Bioadsorbent Synthesized from Rambutan Peel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.506.405 ◽

2012 ◽

Vol 506 ◽

pp. 405-408 ◽

Cited By ~ 3

Author(s):

T. Rubcumintara ◽

A. Aksornpan ◽

W. Jonglertjunya ◽

W. Koo-Amornpattana ◽

P. Tasaso

Keyword(s):

Gold Recovery ◽

Hydroxyl Groups ◽

Loading Capacity ◽

Order Kinetic ◽

Gold Concentration ◽

Solution Ph ◽

Adsorbent Surface ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Ft Ir

The recovery of gold from chloride solutions using bioadsorbent synthesized from waste rambutan peel was studied. The initial gold concentration 25-900 mg/L, solution pH 1-4, temperature 25-60 °C and the amount of adsorbent 1-25 mg were found to affect the efficiency for gold recovery as well as loading capacity. The 99.8 % gold recovery was accomplished in 1 h with loading capacity of 100 mg Au/g adsorbent at the following conditions: adsorbent 25 mg, initial gold concentration 100 mg/L, pH 2 and temperature 60 °C. The decrease of adsorbent from 25 to 1 mg resulted in the highest loading capacity of 2530 mg Au/g adsorbent and 100 % gold recovery within 100 h. The adsorption isotherm as well as mechanism were also elucidated. The Langmuir isotherm and the pseudo second-order kinetic model were fitted well with the experimental results. The activation energy of reaction was calculated to be 31.07 kJ/mol. The mechanism of adsorption is clarified to be the oxidation of hydroxyl groups and reduction of trivalent gold ions to metallic gold on the adsorbent surface which were supported by FT-IR, XRF and SEM.

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Semicarbazide Functionalized Flax Fibers for Effective Adsorption of Cr(VI) from Wastewater Samples

10.26434/chemrxiv.14721303 ◽

2021 ◽

Author(s):

Magda A. Akl ◽

Mohamed Hashem ◽

Aya G. Mostafa

Keyword(s):

Ionic Strength ◽

Adsorption Capacity ◽

High Efficiency ◽

Kinetic Studies ◽

Order Kinetic ◽

Adsorption Model ◽

Flax Fibers ◽

Effects Of Ph ◽

Order Kinetic Model ◽

Wastewater Samples

Semicarbazid modified flax fiber (SC.MFF) was successfully synthesized for the removal of Cr(IV) from different wastewater samples. Preparation of the SC.MFF material occurred in two main steps, the first step is the oxidation of the flax fibers by potassium periodate and the next step is refluxing of the oxidized fibers with semicarbazide ligand. The results show that quaternary ammonium cations were grafted on the surface of SC.MFF successfully. Additionally, a series of characterization of the SC.MFF sorbent was carried out using scanning electron microscopy, FTIR, elemental analysis, and X-ray diffraction spectroscopy. The effects of pH and ionic strength on the adsorption capacity were also investigated, which showed the adsorption capacity of the adsorbent decreased significantly with the increase of ionic strength and pH. Under optimized extraction conditions, the sorption capacity of Cr(VI) is 97.4 mg. g-1. The kinetic studies show that the experimental data matches well with the pseudo-second-order kinetic model. Furthermore, the studied Cr(VI) adsorbed on the sorbent according to the Langmuir adsorption model. Finally, the SC.MFF sorbent was successfully applied for the selective and high-efficiency recovery of Cr(VI) ions from different water samples.

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Adsorption Properties of Au(III) and Cu(II) from Aqueous Solution Using Chemically Treated Sheep Wool

MATEC Web of Conferences ◽

10.1051/matecconf/202133304006 ◽

2021 ◽

Vol 333 ◽

pp. 04006

Author(s):

Solongo Enkhzaya ◽

Koichiro Shiomori ◽

Bolormaa Oyuntsetseg

Keyword(s):

Aqueous Solution ◽

Chemical Treatment ◽

Low Cost ◽

High Capacity ◽

Copper Ion ◽

Order Kinetic ◽

Rate Determining Step ◽

Chemically Treated ◽

Order Kinetic Model ◽

Sheep Wool

Au(III) and Cu(II) adsorption from aqueous solution were carried out using sheep wools with chemical treatments, by NaOH, Na2S, NaHSO3, and NaBH4 aqueous solution. The fibrous wool was transformed into a film like structures after the chemical treatment using Na2S. The sheep wool and the chemically treated sheep wool adsorbed selectively Au(III) from Au-Cu binary aqueous solution and the presence of copper ion had no effect on the Au(III) adsorption. Au(III) adsorbed substantially at low pH range. The kinetic experimental data fitted well with the pseudo-second-order kinetic model and the adsorption amount of Au(III) increased with time and reached a plateau after 12 h. The kinetic analysis suggests that rate determining step of Au adsorption would be chemisorption due to the formation of a monolayer on the wool surface. Sheep wool is a low cost, eco-friendly material, and has a high capacity of adsorption, and could be used as a biosorbent for precious and heavy metals by modification of appropriate chemical treatment.

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Removal of Cadmium from Contaminated Water Using Coated Chicken Bones with Double-Layer Hydroxide (Mg/Fe-LDH)

Water ◽

10.3390/w12082303 ◽

2020 ◽

Vol 12 (8) ◽

pp. 2303

Author(s):

Saif S. Alquzweeni ◽

Rasha S. Alkizwini

Keyword(s):

Heavy Metals ◽

Agitation Speed ◽

Hydroxyl Groups ◽

Order Kinetic ◽

Hydrogen Binding ◽

Aquatic Life ◽

Surface Precipitation ◽

Chicken Bone ◽

Wide Range ◽

Order Kinetic Model

Occurrence of heavy metals in freshwater sources is a grave concern due to their severe impacts on public health and aquatic life. Cadmium (Cd2+) is one of the most dangerous heavy metals, and can cause serious diseases even at low concentrations. Hence, a wide range of treatment technologies exist, such as nanofiltration and biological reactors. In this context, the present investigation aims at the development of a new adsorption medium, made from chicken bones coated with iron (Fe) and magnesium (Mg) hydroxides, to remove cadmium from water. This novel chicken bone functional substance was manufactured by applying layered double hydroxides (LDH) into the chicken bones. Initially, the new adsorption medium was characterized using Fourier-transform infrared spectroscopy (FTIR technology), then it was applied to remove cadmium from water under different conditions, including pH of water (3–7.5), agitation speed (50–200 rpm), adsorbent dose (1–20 g per 100 mL), and contact time (30–120 min). Additionally, the reaction kinetics were studied using a pseudo-first order kinetic model. The results obtained from the present study proved that the new adsorption medium removed 97% of cadmium after 120 min at an agitation speed of 150 rpm, pH of 5, and adsorption dose of 10 g per 100 mL. The results also showed that the new adsorption medium contains a significant number of functional groups, including hydroxyl groups. According to the outcomes of the kinetic study, the mechanism of removing metal is attributed to surface precipitation, ion exchange, complexation, hydrogen binding between pollutants, and the LDH-chicken bone substance.

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Preparation of titanate nanoflower for sorption of 75Se(IV) radioisotope from aqueous solution: Equilibrium, kinetic and thermodynamic studies

Radiochimica Acta ◽

10.1515/ract-2015-2455 ◽

2015 ◽

Vol 103 (12) ◽

Cited By ~ 1

Author(s):

Sahar El-Sayed Abd El-Kader Sharaf El-Deen ◽

Karam Fatwhi Allan ◽

Mohamed Holeil ◽

Gehan El-Sayed Abd El-Kader Sharaf El-Deen

Keyword(s):

Aqueous Solution ◽

Electrostatic Interactions ◽

Outer Sphere ◽

Solution Temperature ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

X Ray ◽

Adsorptive Removal ◽

Order Kinetic Model

AbstractIn this study, the adsorptive removal of selenium (IV) from aqueous solution by titanate nanoflower (TNF) was prepared via alkaline hydrothermal method. The morphology and crystal phase of the TNF were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscope (EDX), selected area electron diffraction (SAED), thermogravimetric analysis (TGA), fourier transform infrared spectroscopy (FTIR) and specific surface area. This study was conducted to determine the influence of various operating parameters such as pH, adsorbate weight, initial anion concentration, contact time and solution temperature on the adsorptive removal of selenium (IV). Equilibrium adsorption data were analyzed using Freundlich, Langmuir and Dubinin–Radushkevich (D–R) isotherm models. The results demonstrated that the adsorption was well described by the Langmuir adsorption isotherm with the maximum adsorption capacity up to 46.52 mg/g at pH 3.5. The adsorption of Se(IV) anions onto the surface of TNF may proceed through outer sphere electrostatic interactions and/or inner-sphere complexation interaction. The kinetic data indicated that the adsorption fit well with the pseudo-second-order kinetic model. The thermodynamic parameters implied that the adsorption process was spontaneous and endothermic in nature.

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Adsorption Properties of a Benzotriazole UV-Absorber on Silk, Wool and Nylon

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.175-176.681 ◽

2011 ◽

Vol 175-176 ◽

pp. 681-686

Author(s):

Jun Zhang ◽

Jing Chun Lv ◽

Ren Cheng Tang

Keyword(s):

Electrostatic Interactions ◽

Adsorption Properties ◽

Water Soluble ◽

Affinity Constant ◽

Order Kinetic ◽

Uv Absorber ◽

Nylon Fabric ◽

Uv Absorbers ◽

Order Kinetic Model ◽

Pseudo Second Order

The photoyellowing and poor UV-protection ability of silk, wool and nylon fabric can be improved through the anti-UV finishing with UV-absorbers. This study is concerned with the adsorption properties of a water-soluble benzotriazole UV-absorber on silk, wool and nylon. It was found that the adsorption kinetics of the UV absorber on the three fibers followed the pseudo second-order kinetic model and the rate constant indicated a faster adsorption rate for UV absorber on silk than those for wool and nylon. The activation energies for the adsorption process on silk, wool and nylon were found to be 49.74, 63.92 and 78.21 kJ/mol, respectively. The adsorption of the UV-absorber on silk and wool had the characteristics of low affinity constant and high saturation value whereas that on nylon showed a small saturation value with a remarkably high affinity constant. The electrostatic interactions between the positively charged amino groups in fibers and the anionic sulfonate groups in UV absorber have an important role in the adsorption of UV absorber.

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Effect of Bio-Based Surfactant on Wettability of Low-Rank Coal Surface and Its Mechanism

10.21203/rs.3.rs-1073850/v1 ◽

2021 ◽

Author(s):

Lin Li ◽

Mingpu Liu ◽

Jianqiao Lvu ◽

Xiaoteng Li ◽

Zhihao Li ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Water System ◽

Low Rank ◽

Order Kinetic ◽

Low Rank Coal ◽

Adsorption Model ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

The Stability ◽

Adhesion Work

Abstract In this study, the effect of a bio-based environment-friendly surfactant, cardanol polyoxyethylene ether (BGF), on the wettability of the surface of low-rank coal (LRC) and its mechanism were studied. The adsorption experiment showed that the adsorption of the surfactant conformed to the Langmuir adsorption model and the pseudo-second-order kinetic model. The adsorption was mainly affected by hydrogen bonding, and the adsorption rate was affected by intraparticle diffusion and liquid film diffusion. The wettability experiment showed that the influence of BGF on the wettability of the surface of LRC followed the given order: BGF-7 > BGF-10 > BGF-15. The investigation of adhesion work showed that the adhesion work and the stability of the coal–water system decreased after adsorption. Fourier transform infrared and X-ray photoelectron spectroscopy analyses showed that after adsorption, the peak strength of vinyl ether, the content of elemental carbon, and the content of C-C/C-H groups increased.

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Graphene Oxide/Polyvinyl Alcohol/Fe3O4 Nanocomposite: An Efficient Adsorbent for Co(II) Ion Removal

Journal of Analytical Methods in Chemistry ◽

10.1155/2021/6670913 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Thu Dieu Le ◽

Luyen Thi Tran ◽

Hue Thi Minh Dang ◽

Thi Thu Huyen Tran ◽

Hoang Vinh Tran

Keyword(s):

Graphene Oxide ◽

Polyvinyl Alcohol ◽

Order Kinetic ◽

Maximum Sorption Capacity ◽

Ion Removal ◽

Maximum Sorption ◽

Order Kinetic Model ◽

Metal Treatment ◽

Pseudo Second Order ◽

Adsorption Of Co2

In this work, an effective nanocomposite-based adsorbent directed to adsorb cobalt (Co2+) ion was successfully synthesized from graphene oxide (GO), polyvinyl alcohol (PVA), and magnetite (Fe3O4) nanoparticles via a coprecipitation technique. The synthesized GO/PVA/Fe3O4 nanocomposite was applied for Co2+ ion removal with the optimized working conditions including 100 min of contact time, 0.01 g of adsorbent dosage, pH of 5.2, and 50°C of temperature. The investigation of adsorption kinetics showed that the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite followed the pseudo-second-order kinetic model with the rate constant k2 being 0.0026 (g mg−1·min−1). The Langmuir model is suitable to describe the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite with the maximum sorption capacity (qmax) reaching 373.37 mg·g−1. The obtained results also indicated that the GO/PVA/Fe3O4 nanocomposite can adsorb/regenerate for at least 5 cycles with a little reduction in removal efficiency. Therefore, we believe that the GO/PVA/Fe3O4 nanocomposite could be used as a potential adsorbent for heavy metal treatment in terms of high adsorption capacity, fast adsorption rate, and recyclability.

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