scholarly journals Adsorption of cadmium ions from simulated battery waste water by polyethylene polyamine modified activated carbon

2021 ◽  
Author(s):  
Baoying Wang ◽  
Jingming Lan ◽  
Junli Pu ◽  
Xiu Liu ◽  
Bonglin Gong
Keyword(s):  
Waste Water ◽  
Activated Carbon ◽  
Potassium Hydroxide ◽  
Competitive Adsorption ◽  
Chemical Plants ◽  
Modified Activated Carbon ◽  
Cadmium Ions ◽  
Structure And Morphology ◽  
Polyethylene Polyamine ◽  
Pseudo Second Order

Abstract The objective of this work was to study the treatment of waste water containing cadmium ions (Cd2+). Activated carbon (AC) was modified with potassium hydroxide (KOH) and polyethylene polyamine (PEPA). The structure and morphology of the modified AC was characterized. The effect of pH on adsorption was investigated, and the binary competitive adsorption and the reusability of the modified AC were studied. Subsequently the modified AC was used as an adsorbent for the removal of Cd2+ from wastewater. The adsorption capacity of optimized modified AC was 9.7 times that of unmodified AC. Kinetic adsorption curves were in accordance with pseudo-second-order kinetics, and the isothermal curves were in accordance with the Langmuir equation. The results indicate that the AC has a potential in the treatment of the waste water containing Cd2+ discharged from chemical plants during battery manufacturing.

Removal of disperse dye from alcoholysis products of waste PET fabrics by nitric acid-modified activated carbon as an adsorbent: Kinetic and thermodynamic studies

2020 ◽  
Vol 90 (17-18) ◽  
pp. 2058-2069 ◽  
Author(s):  
Mengjuan Li ◽  
Jing Lu ◽  
Xiaoqiang Li ◽  
Mingqiao Ge ◽  
Yonggui Li
Keyword(s):  
Activated Carbon ◽  
Nitric Acid ◽  
Chemical Recycling ◽  
Modified Activated Carbon ◽  
Poly Ethylene Terephthalate ◽  
Elemental Analyses ◽  
Different Temperatures ◽  
Pseudo Second Order ◽  
Poly Ethylene ◽  
Oxygen Groups

Decolorization technology is a critical problem of high-quality chemical recycling and recovery of waste poly(ethylene terephthalate) (PET) textiles. In order to deal with this problem, nitric acid-modified activated carbon (AC-HNO3) was utilized as an adsorbent for removal of C.I. Disperse Red 60 (DR60) from the glycolysis products of waste PET fabrics. The glycolysis product was bis(2-hydroxyethyl) terephthalate (BHET). The pore structure and surface properties of AC and AC-HNO3 samples were characterized by N2 adsorption, differential thermogravimetric analysis (DTG) and elemental analyses (EA). Modification with nitric acid increased the amount of oxygen groups of the activated carbon from 12.3% to 18.0% and enhanced the electrostatic attraction between dye molecules and activated carbon. The average color removal ratio of DR60 on AC-HNO3 increased into 97.6 ± 0.5%, which is better than that on raw AC (85.0 ± 1.6%). Relative whiteness of BHET increased from 40.3 ± 0.9% to 98.3 ± 1.1%. The adsorption kinetics for DR60 on the AC-HNO3 were studied using pseudo-first order and pseudo-second order models and fitted to the latter well ( R2 = 0.9999). To investigate the adsorption equilibrium behavior, Freundlich and Langmuir models were examined. The results showed that the Langmuir model provided better correlation ( qmax = 163.9 mg/g). The adsorption isotherms at different temperatures were used for the determination of thermodynamic parameters. Based on the data of Δ G0 , Δ H0 and Ea, the adsorption process was physisorption.

scholarly journals Mathematical Model Describes Treatment of Waste Water Using Modified Activated Carbon

2017 ◽  
Vol 14 (1) ◽  
pp. 94 ◽  
Author(s):  
A.S. Ibrahim ◽  
A.S. AL Buloshi ◽  
S.S. AL Zaabi ◽  
L.A. AL Yafai
Keyword(s):  
Waste Water ◽  
Experimental Data ◽  
Mathematical Model ◽  
Activated Carbon ◽  
Active Carbon ◽  
High Accuracy ◽  
Modified Activated Carbon ◽  
Adsorption And Desorption ◽  
Pollutant Concentrations ◽  
Proposed Model

The proposed mathematical model covered in this paper includes the most important parameters associated with the rates of adsorption and desorption. Also, partial pressure is included since it is an important factor that affects rates of adsorption and desorption. The study focuses on the effects of the constant rates on adsorption of pollutant concentrations for benzene, nickel, cadmium, and copper using modified active carbon. When the rate constant of adsorption decreases, the pollutant concentration will also decrease, yielding high acceptable evidence of the logic of the proposed mathematical model. Also, the proposed model is compared with experimental data and other models to give good outcomes with high accuracy. 

Nitromethane-water competitive adsorption over modified activated carbon

Adsorption ◽  
2011 ◽  
Vol 17 (3) ◽  
pp. 595-602 ◽  
Author(s):  
L. Gonzalo-Chacón ◽  
A. Arcoya ◽  
I. Rodríguez-Ramos ◽  
E. Gallegos-Suárez ◽  
A. Guerrero-Ruiz
Keyword(s):  
Activated Carbon ◽  
Competitive Adsorption ◽  
Modified Activated Carbon

Removal of cadmium from water using by-product Crambe abyssinica Hochst seeds as biosorbent material

2013 ◽  
Vol 68 (1) ◽  
pp. 227-233 ◽  
Author(s):  
Fernanda Rubio ◽  
Affonso Celso Gonçalves ◽  
Ana Paula Meneghel ◽  
Cesar Ricardo Teixeira Tarley ◽  
Daniel Schwantes ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Chemical Interaction ◽  
Previous Treatment ◽  
Point Of Zero Charge ◽  
Cadmium Removal ◽  
Desorption Process ◽  
Crambe Abyssinica ◽  
Cadmium Ions ◽  
Best Fitting ◽  
Pseudo Second Order

The effectiveness of Crambe abyssinica Hochst seeds by-product as a biosorbent for the removal of cadmium ions from wastewater was analyzed. The biomass of crambe was characterized by scanning electron microscopy, infrared spectroscopy and determining the point of zero charge. The optimum adsorption conditions obtained were 400 mg of biomass in a solution of pH 6.0 and contact time of 60 min to remove 19.342 mg g−1 cadmium ions. The isotherms of adsorption were constructed and, according to the mathematical linearization, the best fitting followed the Freundlich and Dubinin–Radushkevich models, describing a multilayer adsorption and chemical interaction, also confirmed by the pseudo-second order model and enthalpy value. In the desorption process, about 79% of cadmium ions that had been adsorbed were recovered. The same conditions applied for studying the isotherms of adsorption and desorption were used for comparative study with activated carbon. It was concluded that the use of crambe by-product as biosorbent for cadmium removal in wastewaters was not only a viable alternative to activated carbon, but also required no previous treatment, so it represents a sustainable material with high applicability and low environmental impact.

scholarly journals Effect of Sodium Benzenesulfonate on SO42− Removal from Water by Polypyrrole-Modified Activated Carbon

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Feng Zhang ◽  
Dong-Sheng Wang ◽  
Fan Yang ◽  
Tian-Yu Li ◽  
Hong-Yan Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Granular Activated Carbon ◽  
Langmuir Model ◽  
Sulfate Adsorption ◽  
Modified Activated Carbon ◽  
Pseudo Second Order ◽  
Acidic Conditions ◽  
Adsorption Desorption ◽  
Desorption Cycle

Sodium benzenesulfonate was doped into polypyrrole-modified granular activated carbon (pyrrole-FeCl3·(6H2O)-sodium benzenesulfonate-granular activated carbon; PFB-GAC) with the goal of improving the modified GAC’s ability to adsorb sulfate from aqueous solutions. At a GAC dosage of 2.5 g and a pyrrole concentration of 1 mol L−1, the adsorption capacity of PFB-GAC prepared using a pyrrole:FeCl3·(6H2O):sodium benzenesulfonate ratio of 1000 : 1500 : 1 reached 23.05 mg g−1, which was eight times higher than that for GAC and two times higher than that for polypyrrole-modified GAC without sodium benzenesulfonate. Adsorption was favored under acidic conditions and high initial sulfate concentrations. Doping with sodium benzenesulfonate facilitated polymerization to give polypyrrole. Sodium benzenesulfonate introduced more imino groups to the polypyrrole coating, and the N+ sites improved ion exchange of Cl− and SO42− and increased the adsorption capacity of sulfate. Adsorption to the PFB-GAC followed pseudo-second-order kinetics. The adsorption isotherm conformed to the Langmuir model, and adsorption was exothermic. Regeneration using a weak alkali (NH3·H2O), which released OH− slowly, caused less damage to the polypyrrole than using a strong alkali (NaOH) as the regeneration reagent. NH3·H2O at a concentration of 12 mol L−1 (with the same OH− concentration as 2 mol L−1 NaOH) released 85% of the sorbed sulfate in the first adsorption-desorption cycle, and the adsorption capacity remained >6 mg g−1after five adsorption-desorption cycles.

scholarly journals Phosphonium-based Ionic Liquid Modified Activated Carbon from Mixed Recyclable Waste for Mercury(II) Uptake

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 570 ◽  
Author(s):  
Mohamed Habila ◽  
Zeid AlOthman ◽  
Ayman Ghfar ◽  
Maha Al-Zaben ◽  
Ahmed Alothman ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Activated Carbon ◽  
Adsorption Process ◽  
Raw Materials ◽  
Multiwall Carbon Nanotubes ◽  
Multilayer Adsorption ◽  
Modified Activated Carbon ◽  
Inorganic Content ◽  
Pseudo Second Order ◽  
Multiwall Carbon

The contamination of water surfaces by mercury is a dangerous environmental problem due to its toxicity, which leads kidney damage. Activated carbon from mixed recyclable waste modified by phosphonium-based ionic liquid (IL-ACMRW) was therefore prepared and evaluated for Hg(II) remediation. The activated carbon used in this study was prepared from mixed waste, including cardboard, papers and palm wastes as cheap raw materials. The mixed Recyclable Waste Activated Carbon was combined with trihexyl(tetradecyl)phosphonium Bis2,4,4-(trimethylpentyl)phosphinate (Cyphos® IL 104) ionic liquid to form an adsorbent with organic-inorganic content, in order to improve the Hg(II) uptake from aqueous solutions. FTIR confirms the presence of P, C=O and OH after this modification. The adsorption process was investigated and the evaluated results showed that the capacity was 124 mg/g at pH 4, with a contact time of 90 min, an adsorbent dose of 0.4 g/L, and a Hg(II) concentration of 50 mg/L. This Hg(II) adsorption capacity is superior than that reported in the literature for modified multiwall carbon nanotubes. The adsorption of Hg(II) on the modified activated carbon from mixed recyclable waste was found to follow the pseudo second-order kinetics model. Isotherms of adsorption were analyzed via Freundlich and Langmuir models. The results indicated that Freundlich is the best model to describe the process, suggesting multilayer adsorption.

Research on Adsorption of H2S by Modified Activated Carbon

2012 ◽  
Vol 463-464 ◽  
pp. 128-132
Author(s):  
Hong Qin ◽  
Du Xue Wu ◽  
Qing Wang
Keyword(s):  
Activated Carbon ◽  
Thermogravimetric Analysis ◽  
Adsorption Capacity ◽  
Potassium Hydroxide ◽  
Surface Oxidation ◽  
Nitrogen Adsorption ◽  
Oxidation Products ◽  
Experimental Conditions ◽  
Modified Activated Carbon ◽  
Dry Distillation

Activated carbon was modified by urea, potassium hydroxide and potassium respectively. The porosity of the samples properties was analyzed by nitrogen adsorption. Then it was used as adsorbent to catalyze and absorbed H2S from the gas based on dry distillation. The experiments in this paper were carried to study the effects including H2S concentration, impregnating solutions on adsorption of H2S on the modified activated carbon. The results showed that the adsorption capacity of the modified activated carbon was relevant with the kinds of pickling liquid and experimental conditions, On the whole, The lower was concentration of H2S, the higher would adsorption capacity of modified activated carbon be. At the same time the experiments also analyzed the samples of surface oxidation products through thermogravimetric analysis.

scholarly journals Comparative study for adsorption of acidic and basic dyes on activated carbon prepared from date stone by different activation agent

2020 ◽  
Vol 13 (1) ◽  
pp. 12-20
Author(s):  
Azhaar Radhi Jabbar
Keyword(s):  
Activated Carbon ◽  
Phosphoric Acid ◽  
Surface Area ◽  
Zinc Chloride ◽  
Potassium Hydroxide ◽  
Adsorption Process ◽  
Activated Carbons ◽  
Second Order ◽  
Bet Surface Area ◽  
Pseudo Second Order

This research includes a lab scale work to investigate the feasibility of treating waste water which polluted with dyes exhausted from textile factory by using adsorption process. Three type of activated carbon were prepared using locally available waste material (date stone). Chemical activation method  with (zinc chloride, potassium hydroxide, or phosphoric acid) was used  as activators  to  prepared carbon. Firstly, the materials were carbonized at 275 oC for 90 min and then the carbonized materials were treated with (4 molar) solution of acid, base or salt for 24 hour. Finally, these materials were activated at 600 oC for two hours in the presence of nitrogen gas flow. The resulted activated carbons were checked by its (BET) surface area analysis and surface morphology by SEM. The surface area values were (815, 950,600) m2/g for carbon produced from the activation of date  stone by phosphoric acid, potassium hydroxide or zinc chloride respectively. SEM characterizations show that activated carbons that prepared from potassium hydroxide have higher surface area and good adsorption characteristics than that prepared from activation with phosphoric acid or zinc chloride. The  adsorption process was studied using two types of dyes. The first one is acidic (methyl orange) and the other is basic (bismark brown). The adsorption isotherms and kinetics where investigated for both dyes at temperatures (30,40,50,60)oC for concentration  range  equal to (6-16)mg/l.  The  adsorption data of equilibrium were presented by using two common adsorption isotherm equations. The data was fitted fairly well with Langmuir isotherm for both dyes on all types of prepared activated carbons. The kinetic of adsorption was study by using two kinetic equations, pseudo first order and pseudo second order. The result showed the rapid increase in the rate of adsorption at the initial until equilibrium achieved. Pseudo second order model were represent the data very well with confidence level 0.99.

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