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

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.

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

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

<p>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.</p>

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

2020 ◽  
Vol 28 (2) ◽  
pp. 1725-1733
Author(s):  
Marta Kalbarczyk ◽  
Aleksandra Szcześ ◽  
Dariusz Sternik
Keyword(s):  
Electrostatic Interactions ◽  
Copper Ion ◽  
Environmentally Friendly ◽  
Material Surface ◽  
Hydroxyl Groups ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Ion Removal ◽  
Developed Surface ◽  
Order Kinetic Model

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.

scholarly journals Removal of cationic dye methylene blue (MB) from aqueous solution by Coffee and Peanut husk Modified with Magnetite Iron Oxide Nanoparticles

2019 ◽  
Vol 62 (3) ◽  
Author(s):  
Naereh Besharati ◽  
Nina Alizadeh ◽  
Shahab Shariati
Keyword(s):  
Methylene Blue ◽  
Magnetite Nanoparticles ◽  
Dye Adsorption ◽  
Order Kinetic ◽  
Cationic Dye ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
New Type ◽  
Ft Ir ◽  
Modified Adsorbents

Abstract. This study was focused on the adsorption of methylene blue (MB) as a cationic dye on magnetite nanoparticles loaded with coffee (MNLC) and magnetite nanoparticles loaded with peanut husk (MNLPH) as naturally cheap sources of adsorbent. Coffee and Peanut husk were magnetically modified by contact with water-based magnetic fluid. These new type of magnetically natural materials can be easily separated by means of magnetic separators. They were characterized with Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) instruments. Different parameters affecting MB removal efficiency such as contact time, pH of solution and amount of adsorbents were studied and optimized. Dye adsorption process was studied from both kinetic and equilibrium point. The studies of MB sorption kinetic showed rapid dynamic sorption with second-order kinetic model, suggesting chemisorption mechanism with R2 = 0.9988, qeq=10.28 mg g-1 and R2=0.9967, qeq=128.20 mg g-1, respectively. Equilibrium data were fitted well to the Langmuir isotherm more than Freundlich and Temkin isotherm. The modified adsorbents showed MB removal with 88.49 and 74.62 mg g-1 sorption capacity for MNLC and MNLPH, respectively. This study showed a simple, efficient and reliable method for removal of MB from aqueous solutions with MNLC and MNLPH as efficient adsorbents. Resumen. Este estudio se centró en la adsorción de azul de metileno (MB) como un colorante catiónico en nanopartículas de magnetita cargadas con café (MNLC) y nanopartículas de magnetita cargadas con cáscara de cacahuete (MNLPH) como fuentes de adsorbente naturalmente económicas. El café y la cáscara de maní se modificaron magnéticamente por contacto con un fluido magnético a base de agua. Este nuevo tipo de materiales magnéticamente naturales se puede separar fácilmente mediante separadores magnéticos. Se caracterizaron con espectroscopia infrarroja de transformada de Fourier (FT-IR), difracción de rayos X en polvo (DRX) y microscopía electrónica de barrido (SEM). Se estudiaron y optimizaron diferentes parámetros que afectan la eficiencia de eliminación de MB, como el tiempo de contacto, el pH de la solución y la cantidad de adsorbentes. Se estudió el proceso de adsorción de tinte desde el punto de equilibrio y cinético. Los estudios de cinética de absorción de MB mostraron una absorción dinámica rápida con un modelo cinético de segundo orden, lo que sugiere un mecanismo de quimiosorción con R2= 0.9988, qeq= 10.28 mg g-1 y R2= 0.9967, qeq= 128.20 mg g-1, respectivamente. Los datos de equilibrio se ajustaron bien a la isoterma de Langmuir más que a la isoterma de Freundlich y Temkin. Los adsorbentes modificados mostraron eliminación de MB con 88.49 y 74.62 mg g-1 de capacidad de absorción para MNLC y MNLPH, respectivamente. Este estudio mostró un método simple, eficiente y confiable para la eliminación de MB de soluciones acuosas con MNLC y MNLPH como adsorbentes eficientes.

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

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

<p>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<sup>-1</sup>. 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. </p>

scholarly journals Removal of lithium from water by aminomethylphosphonic acid-containing resin

2018 ◽  
Vol 83 (9) ◽  
pp. 1059-1069 ◽  
Author(s):  
Aydin Çiçek ◽  
Onur Yilmaz ◽  
Özgür Arar
Keyword(s):  
Chelating Resin ◽  
Solution Temperature ◽  
Order Kinetic ◽  
Uptake Capacity ◽  
Solution Ph ◽  
Sorption Data ◽  
Aminomethylphosphonic Acid ◽  
Optimum Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order

This study gives an overview of the ability of aminomethylphosphonic acid containing chelating resin for the removal of lithium (Li+) from water. Studies were performed under various conditions such as resin dose, initial Li+ concentration, solution pH and solution temperature. Results showed that the sorption of Li+ reached equilibrium within 15 min and the experimental data were well fitted by the pseudo-second-order kinetic model. The Li+ sorption was highly pH dependent, and the optimum pH for Li+ removal was ?3. Isotherm sorption data displayed good correlation with the Langmuir model, and maximum monolayer sorption capacity of resin found as 13.65 mg/g. Thermodynamic studies suggested that Li+ sorption onto chelating resin was an exothermic and spontaneous process in nature. Resin can be regenerated by 0.1 M HCl, NaCl or H2SO4 with > 99 % efficiency. Desorption of Li+ with 0.1 M NaCl resulted in no changes of the uptake capacity through four subsequent sorption/desorption cycles

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

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.

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

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

<p>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<sup>-1</sup>. 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. </p>

scholarly journals Evaluation of Wheat Bran as a Biosorbent for Potential Mitigation of Dye Pollution in Industrial Waste Waters

2019 ◽  
Vol 35 (5) ◽  
pp. 1565-1573 ◽  
Author(s):  
Sujata Das ◽  
Shalini Singh ◽  
Shashank Garg
Keyword(s):  
Wheat Bran ◽  
Industrial Waste ◽  
Alkali Treatment ◽  
Dye Decolorization ◽  
Order Kinetic ◽  
Waste Waters ◽  
Adsorption Model ◽  
Adsorbate Concentration ◽  
Order Kinetic Model ◽  
Printing Ink

Crystal Violet (CV) is a basic dye that is extensively used for various industrial uses, ranging from, antimicrobial agent, paints, printing ink, biological stains, to textile dyes. Despite its many uses, it has been associated with environment pollution and toxicity, just like other chemical based industrial dyes, if not kept in check. In the current study, wheat bran (WB), an agro-industrial waste reside, was tested for its adsorptive potential for removal/decrease of CV from industrial waste waters. Under optimized conditions of incubation (pH 8, temperature 30° C, adsorbent concentration 10gm/L, time 180 mins & adsorbate concentration 100mg/L), the adsorbent removed around 88% of CV from its aqueous solution, fitting appropriately adsorption model (Langmuir isotherm) with maximum adsorption capability (qm) value of 25.66 mg/gm, and following pseudo first-order kinetic model. Alkali treatment of adsorbent, though, showed around 4% increase in dye decolorization, but unmodified bran was preferred for further work to justify the need for cheap and environment friendly adsorbent to remediate industrial dye waste waters.

A new sand adsorbent for the removal and reuse of nickel ions from aqueous solutions

2017 ◽  
Vol 75 (8) ◽  
pp. 1812-1819 ◽  
Author(s):  
Wenhong Tao ◽  
Ling Qi ◽  
Huimin Duan ◽  
Shiquan Liu
Keyword(s):  
Aqueous Solutions ◽  
Removal Efficiency ◽  
Solution Temperature ◽  
Porous Coating ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Experimental Conditions ◽  
Nickel Ions ◽  
Order Kinetic Model ◽  
Ph Range

Nickel ions (Ni(II)) in aqueous solutions were removed by a sand adsorbent with a surface functionalized porous coating. The sand adsorbent has a very large surface area of 150 m2/g. The influence of pH, initial concentration of the solution, temperature, contact time and adsorbent dosage on the removal efficiency of the synthesized sand adsorbent toward Ni(II) in the aqueous solutions were studied. The results indicate that the adsorption of nickel onto the sand adsorbent greatly increases the pH range of 2–4 and slightly increases with temperature from 25 to 40 °C. The maximum removal efficiency and ion retention in per unit mass of the adsorbent were 100% and 5.78 mg/g, respectively, under the specified experimental conditions. The adsorption can be described by the pseudo-second-order kinetic model and the Freundlich adsorption model. The adsorbed nickel (4.24 mg/g) together with the spent adsorbent were successfully employed to prepare a brown glass, suggesting a new way to reutilize the recovered nickel from wastewater and to avoid secondary pollution caused by the used adsorbents.

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