Adsorption study of bisphenol-A and chlorpyrifos onto nanobentonite intercalated with magnetite and sodium alginate: kinetics and isotherm models

2022 ◽  
Author(s):  
R. M. El-Sharkawy ◽  
E. A. Allam ◽  
A. S. M. Ali ◽  
M. E. Mahmoud
Keyword(s):  
Bisphenol A ◽  
Sodium Alginate ◽  
Isotherm Models ◽  
Adsorption Study

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

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.

scholarly journals Adsorption Study of the Removal of Copper (II) Ions using Activated Carbon Based Canarium Schweinfurthii Shells Impregnated with ZnCl2

2017 ◽  
Vol 8 (1) ◽  
pp. 18
Author(s):  
Kammegne Adelaide Maguie ◽  
Ndi Julius Nsami ◽  
Kouotou Daouda ◽  
Che Nangah Randy ◽  
Ketcha Joseph Mbadcam
Keyword(s):  
Experimental Data ◽  
Activated Carbon ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Equilibrium Isotherm ◽  
Adsorption Study ◽  
Equilibrium Time ◽  
High Affinity ◽  
Pseudo Second Order ◽  
Carbon Based

<p>The adsorption of Cu2+ions on activated carbon based canarium schweinfurthii impregnated with ZnCl2 was studied. The shells of canarium schweinfurthii were impregnated with ZnCl2 at varying ZnCl2 concentrations, temperature, residence time while keeping the heating rate fixed at 10 °C / min and the ratio of impregnation of 1:1. The activated carbon with the highest surface area in term of iodine number of 860,817 mg/g, the highest methylene blue of 741,6 mg/g and 74,66 % of yield of carbon was obtained at 650 °C, 60 % ZnCl 2 and 30min. From the batch adsorption studies, the equilibrium time was found to be 40 min. Analysis of equilibrium isotherm models revealed a good correlation of the experimental data with the Tempkin (R 2 = 0.909) model. This confirms a high affinity of the activated carbon for Cu 2+ ions on the heterogeneous surface. The value of energy obtained from the Tempkin model was 60,606 J/mol and the presence of pics between 487 cm-1 to 871 cm-1 indicating that physisorption and chemisorption were taking place during this sorption. The pseudo-second order kinetics(R 2 = 0.999) governs the adsorption of Cu2+ions on this activated carbon.</p>

Calcium-alginate/carbon nanotubes/TiO2 composite beads for removal of bisphenol A

2016 ◽  
Vol 74 (7) ◽  
pp. 1585-1593 ◽  
Author(s):  
Maria R. Hartono ◽  
Ariel Kushmaro ◽  
Robert S. Marks ◽  
Xiaodong Chen
Keyword(s):  
Carbon Nanotubes ◽  
Bisphenol A ◽  
Flow Rate ◽  
Dose Response ◽  
Calcium Alginate ◽  
Fixed Bed ◽  
Isotherm Models ◽  
Removal Capacity ◽  
Composite Beads ◽  
Bed Height

In this study, composite calcium-alginate/carbon nanotubes/TiO2 beads were prepared and tested for their potential in the removal of bisphenol A (BPA) from aqueous solutions. The removal traits were inspected using a fixed-bed sorption column. By varying parameters such as bed height (15–20 cm), flow rate (2.0–6.0 mL.min−1) and inlet BPA concentration (10–30 mg.L−1) we assessed the removal capacity of these composites. The highest sorption capacity of 5.46 mg.g−1 was achieved at 10 mg.L−1 BPA concentration, 2.0 mL.min−1 flow rate and 20 cm bed height at saturation. Adams-Bohart, Yoon-Nelson and Dose-Response isotherm models were applied to evaluate the performance of the column at different inlet concentrations. The experimental data satisfactorily fit the Dose-Response model with high correlation (r2 &gt; 0.97) across the breakthrough curve. Regeneration of the used adsorbent beads were performed by immersion in the desorption solvent followed by light irradiation. It was postulated that inclusion of TiO2 facilitates the desorbed pollutant degradation from the used adsorbent beads.

scholarly journals Adsorption Study of Malachite Green Dye of New Schiff Base Liquid Crystal Surface (Thermodynamic and Kinetic)

2018 ◽  
Vol 7 (4.36) ◽  
pp. 713
Author(s):  
Adraa Abdul Kadhim Wasaf AL-Fatlawy ◽  
. .
Keyword(s):  
Malachite Green ◽  
Crystal Surface ◽  
Uv Spectroscopy ◽  
Energy Conditions ◽  
Isotherm Models ◽  
Dispersion Energy ◽  
Adsorption Study ◽  
Malachite Green Dye ◽  
Ft Ir ◽  
Base Liquid

This work incorporates blends of new heterocyclic mixes of (2-amino-6-methoxy benzothiazole), from response with (p-hydroxybenzaldehyde) to yield Schiff bases, the compound have been distinguished (FT-IR ,HNMR) the misomorphic stages were recognized by energized light magnifying lens (POM) and estimated change temperatures for compound by differrntion checking calorimeter (DSC) at that point investigation of fluid precious stone properties and we will contemplate the adsorption of malachite green color on this fluid gem as a surface. Likewise The examination incorporated the trial of applying the isotherm models of Langmuir, Freundlich, harkinsjura and Temkin to the handy adsorption information of the color under investigation utilizing the UV spectroscopy. The active information were demonstrated by utilizing pseudo-first-arrange, pseudo-second-request, Elovich and intra-molecule dispersion energy conditions, Adsorption adsorbents were additionally used to get the estimations of the thermodynamic capacities (Free vitality ∆G, enthalpy ∆H, and ∆S entropy and actuation vitality). 

scholarly journals Preparation and Characterization of Sodium Alginate-Based Oxidized Multi-Walled Carbon Nanotubes Hydrogel Nanocomposite and its Adsorption Behaviour for Methylene Blue Dye

2021 ◽  
Vol 9 ◽  
Author(s):  
Edwin Makhado ◽  
Mpitloane Joseph Hato
Keyword(s):  
Carbon Nanotubes ◽  
Methylene Blue ◽  
Sodium Alginate ◽  
Adsorption Kinetics ◽  
Isotherm Models ◽  
Regeneration Ability ◽  
Maximum Adsorption Capacity ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Hydrogel Nanocomposite

Herein, a sodium alginate/poly (acrylic acid)/oxidized-multi-walled carbon nanotubes hydrogel nanocomposite (SA/p(AAc)/o-MWCNTs HNC) was synthesized by in situ free-radical polymerization method. The synthesized SA/p(AAc)/o-MWCNTs HNC was used to remove methylene blue (MB) from aqueous solution. The synthesized HNC was confirmed by employing various characterization techniques. The SA/p(AAc)/o-MWCNTs HNC exhibited a maximum swelling capacity of 2265.4% at pH 8.0. The influence of vital parameters in the sorption process including the initial pH, adsorption dose, contact time and concentration were systematically examined on a batch mode. Subsequently, adsorption kinetics as well as isotherm models were applied to assess the nature and mechanism of the adsorption process. Adsorption kinetics were best described by pseudo-second-order model, while the Langmuir isotherm model governed the adsorption isotherm. The SA/p(AAc)/o-MWCNTs HNC exhibited a maximum adsorption capacity of 1596.0 mg/g at 25°C. This adsorbent showed excellent MB uptake and good regeneration ability.

scholarly journals Removal of Cr(VI) from aqueous solution by biochar derived from rice husk

2021 ◽  
Vol 6 (1) ◽  
pp. 11-17
Author(s):  
Risfidian Mohadi ◽  
Neza Rahayu Palapa ◽  
Tarmizi Taher ◽  
Patimah Mega Syah Bahar Nur Siregar ◽  
Normah ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Surface Area ◽  
Rice Husk ◽  
Order Reaction ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Rice Husks ◽  
Xrd Pattern ◽  
Adsorption Study ◽  
Good Potential

In this work, biochar produced from Indonesian rice husks. Then used as adsorbent of Cr(VI) in aqueous solution. The XRD pattern of biochar showed the characterization pattern at 23º (002) reflection, appearance of silicate oxide, and the carbon vibrations. The surface area and SEM morphologies confirmed that after pyrolysis treatment the surface of rice husk has changed. The surface area of biochar increased after thermal treatment. The adsorption study of Cr(VI) by biochar demonstrate 2nd-order reaction, and Langmuir isotherm models. The maximum adsorption capacity of biochar derived rice husk to adsorb Cr(VI) is 161.290 mg/g, and biochar showed the good potential as reuseable adsorbent to remove heavy metal in aqueous solution.

The study of non-linear kinetics and adsorption isotherm models for Acid Red 18 from aqueous solutions by magnetite nanoparticles and magnetite nanoparticles modified by sodium alginate

2016 ◽  
Vol 74 (5) ◽  
pp. 1235-1242 ◽  
Author(s):  
Zohre Berizi ◽  
Seyed Yaser Hashemi ◽  
Mahdi Hadi ◽  
Ali Azari ◽  
Amir Hosein Mahvi
Keyword(s):  
Adsorption Isotherm ◽  
Sodium Alginate ◽  
Magnetite Nanoparticles ◽  
Linear Models ◽  
Freundlich Isotherm ◽  
Precipitation Method ◽  
Isotherm Models ◽  
Residual Concentration ◽  
Adsorption Isotherm Models ◽  
Non Linear

Azo dyes are widely used in various industries. These substances produce toxic byproducts in aquatic environments in addition to their mutagenic and carcinogenic potential effects. In this study, the effect of magnetite nanoparticles and magnetite nanoparticles modified by sodium alginate in batch systems and nonlinear kinetic and adsorption isotherm models were investigated. Magnetite nanoparticles were synthesized by chemical co-precipitation method and then modified and used as adsorbent to adsorb Acid Red 18. After determining the optimum pH and adsorbent dose, non-equilibrium models for kinetic adsorption were tested with concentrations (25–100 mg/L) and at eight different periods of time (1–15 min) and the pseudo-first-order and pseudo-second-order non-linear models were used to describe the results. For adsorption isotherm, a contact time of 120 min was studied in different concentrations (25–100 mg/L) and the residual concentration of Acid Red 18 was obtained. The results are described by non-linear Langmuir, Freundlich and Dubinin–Radushkevich isotherm models. The optimum amounts of pH for magnetite nanoparticles and for modified ones were 3 and 5, respectively, the efficiencies were 0.75 and 0.2 g/L, respectively. According to the results sodium alginate has a high performance in adsorption of Acid Red 18. Adjusted correlation coefficients and chi-square test showed that Freundlich isotherm and then Langmuir isotherm can well describe the experimental results. In Freundlich, the value of (Kf) was 3.231 (L/g) for magnetite nanoparticles and 21.615 (L/g) for modified adsorbent. In Langmuir, the value of (qm) was 16.259 (mg/g) for magnetite nanoparticles and 73.464 (mg/g) for modified adsorbent. Comparing the Langmuir maximum calculated adsorption capacity indicated that modified adsorbent can adsorb the pollutants 6.5 times more than the other one.

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