Efficient pollutants removal by amino-modified nanocellulose impregnated with iron oxide

A novel adsorbents NC-PEG, obtained by the modification of nanocellulose (NC) with PEG-6-arm amino polyethylene glycol (PEG-NH2) via maleic anhydride (MA) linker, was used for the removal of Cd2+ and Ni2+ from water. Subsequent precipitation of goethite (FO) on NC-PEG produced NC-PEG/FO adsorbent which was used for As(V) and As(III) removal. In a batch test, the influence of pH, contact time, initial ion concentration and temperature on adsorption efficiency were studied. The maximum adsorption capacities found for Cd2+ and Ni2+, obtained by the use of Langmuir model, were 37.9 and 32.4 mg g?1 at 25 ?C, respectively. Also, high As(V) and As(III) removal capacity of 26.0 and 23.6 mg g-1 were obtained. Thermodynamic parameters indicate endothermic, feasible and spontaneous nature of adsorption process. Kinetic study, i.e. fitting by Weber-Morris model predicted intra-particle diffusion as a rate-controlling step. Multi-cycle reusability of both NC-PEG and NC-PEG/FO, significantly affects the affordability of techno-economic indicators for consideration of their possible application.

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Removal of lead from aqueous solutions by low cost and waste biosorbents (lemon, bean and artichoke shells)

Water Science & Technology ◽

10.2166/wst.2020.093 ◽

2020 ◽

Vol 81 (1) ◽

pp. 159-169

Author(s):

Feyza Ergüvenerler ◽

Şerif Targan ◽

Vedia Nüket Tirtom

Keyword(s):

Contact Time ◽

Adsorption Process ◽

Low Cost ◽

Standard Free Energy ◽

Freundlich Isotherm ◽

Standard Entropy ◽

X Ray ◽

Adsorption Capacities ◽

Influence Of Ph ◽

Scanning Electron

Abstract Simple, fast, effective, low cost and waste biosorbents, lemon, bean and artichoke shells, were used to remove lead (II) ions from aqueous solution. The influence of pH, contact time, temperature and lead (II) concentration of the removal process was investigated. The sufficient contact time was deemed 10 minutes for bean and artichoke shells and 60 minutes for lemon shells for Pb(II) ions. The thermodynamic parameters, such as standard free energy (ΔG), standard enthalpy (ΔH), and standard entropy (ΔS) of the adsorption process were calculated as −5.6786, −5.5758, −3.1488 kJmol−1 for ΔG, −7.2791, −20.285, −9.5561 kJ mol−1 for ΔH, −0.00545, −0.05017, −0.02185 kJ mol−1 K−1 for ΔS, respectively, for lemon, artichoke and bean shells. Maximum adsorption capacities of lead (II) were observed as 61.30 mg g−1, 88.5 mg g−1 and 62.81 mg g−1, respectively, for lemon, bean and artichoke shells according to the Freundlich isotherm model at 20 °C. Scanning electron microscope (SEM) and energy-dispersive X-ray detector (EDX) were used to characterize the surface morphology of the adsorbents. Consequently, Pb(II) removal using lemon, bean and artichoke shells would be an effective method for the economic treatment of wastewater.

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Investigation on the adsorption of antibiotics from water by metal loaded sewage sludge biochar

Water Science & Technology ◽

10.2166/wst.2020.578 ◽

2020 ◽

Author(s):

Xiulei Fan ◽

Zheng Qian ◽

Jiaqiang Liu ◽

Nan Geng ◽

Jun Hou ◽

...

Keyword(s):

Sewage Sludge ◽

Specific Surface ◽

Pore Structure ◽

Surface Area ◽

Adsorption Process ◽

Low Cost ◽

Particle Diffusion ◽

Surface Functionality ◽

Intra Particle Diffusion ◽

Adsorption Amount

Abstract Application of sewage sludge biochar as an adsorbent for antibiotics treatment has obtained special attention owning to their low cost and surface functionality. Three metal ions were selected to modify sewage sludge biochar through the pyrolysis with the metal loaded method. Fe loaded sewage sludge biochar (BC-Fe), Al loaded sewage sludge biochar (BC-Al) and Mn loaded sewage sludge biochar (BC-Mn) were characterized and used to explore the performance of adsorbing tetracycline (TC), sulfamethoxazole (SMZ) and amoxicillin (AMC). BC-Fe, BC-Al and BC-Mn possessed rougher surfaces, larger specific surface area and better pore structure. Intra-particle diffusion and Langmuir models were more suitable to describe the adsorption process. The maximum adsorption amount of TC, SMZ and AMC could reach 123.35, 99.01 and 109.89 mg/g by BC-Fe. Furthermore, the main mechanism of antibiotics adsorption by metal loaded sewage sludge biochars might be pores filling, Van der Waals forces and H-bonding. The study can not only solve the problems associated with the pollution of antibiotics from wastewater, but also reduced the treatment press of sewage sludge effectively.

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Formation of porous wollastonite-based ceramics after sintering with yeast as the pore-forming agent

Science of Sintering ◽

10.2298/sos1703235o ◽

2017 ◽

Vol 49 (3) ◽

pp. 235-246 ◽

Cited By ~ 2

Author(s):

Nina Obradovic ◽

Suzana Filipovic ◽

Jelena Rusmirovic ◽

Georgeta Postole ◽

Aleksandar Marinkovic ◽

...

Keyword(s):

Diffraction Method ◽

Ion Concentration ◽

Order Kinetic ◽

X Ray Diffraction ◽

Phosphate Ions ◽

Intra Particle Diffusion ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Set Up ◽

Influence Of Ph

In this paper, synthesis of porous wollastonite-based ceramics was reported. Ceramic precursor, methylhydrocyclosiloxane, together with micro-sized CaCO3, was used as starting material. After 20 min of ultrasound treatment, and calcination at 250 oC for 30 min, yeast as a pore-forming agent was added to the as-obtained powders. Sintering regime was set up based on the results obtained by differential thermal analysis. Prepared mixture was pressed into pallets and sintered at 900 oC for 1 h. After the sintering regime, porous wollastonite-based ceramics was obtained. The phase composition of the sintered samples as well as microstructures was analyzed by X-ray diffraction method and SEM. In a batch test, the influence of pH, contact time and initial ion concentration on adsorption efficiency of As+5, Cr+6, and phosphate ions on synthesized wollastonite-based ceramics were studied. Time-dependent adsorption was best described by pseudo-second-order kinetic model and Weber-Morris model that predicted intra-particle diffusion as a rate-controlling step of overall process. High adsorption capacities 39.97, 21.87, and 15.29 mgg-1 were obtained for As+5, Cr+6, and phosphate ions, respectively.

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Remediation of Crystal Violet Dye Aqueous Solution Using Agro Waste Based Activated Carbon: Equilibrium and Kinetics Studies

Journal of Engineering Research and Reports ◽

10.9734/jerr/2020/v15i417149 ◽

2020 ◽

pp. 1-11

Author(s):

Chukwunonso Chukwuzuloke Okoye ◽

Okechukwu Dominic Onukwuli ◽

Chinenye Faith Okey- Onyesolu ◽

Ifeoma Amaoge Obiora- Okafo

Keyword(s):

Aqueous Solution ◽

Kinetic Data ◽

Adsorption Process ◽

Particle Diffusion ◽

Type I ◽

First Order ◽

Equilibrium And Kinetics ◽

Equilibrium Data ◽

Intra Particle Diffusion ◽

Kinetics Of

Remediation of crystal violet (CV) dye aqueous solution was attempted using acid activated raphia hookeri seeds (AARHS) as adsorbent. Adsorption equilibrium and kinetics of CV dye uptake onto AARHS were examined in series of experimental runs, and effects of contact time and initial CV dye concentrations were investigated at different solution temperatures (303 K, 313 K and 323 K). Equilibrium and kinetic data modeling of the adsorption process was performed using selected theoretical methods. Four different forms of Langmuir (type I, II, III and IV) and Freundlich isotherms were considered for fitting the equilibrium data while zero order, first order, pseudo-first order (PFO), second order, types I, II, III and IV pseudo-second order (PSO) and intra-particle diffusion models were selected to describe the kinetics of the adsorption process. Error functions including coefficient of determination (R2), root mean square error (RMSE), chi square (χ2) and average relative error (ARE) were employed to reveal model of best fit. Results obtained from error value computations show that the equilibrium data best followed Freundlich isotherm, which indicates multilayer adsorption of CV dye onto AARHS. The calculated Freundlich’s adsorption intensity values at different temperatures reveal the favourability of the adsorption process. PSO type I, II and IV best fitted the kinetic data compared to other investigated models. Intra-particle diffusion plots depict that the adsorption process of CV dye onto AARHS is a two-step process and also, intra-particle diffusion is not the only rate-limiting step.

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Adsorptive performance of penta-bismuth hepta-oxide nitrate, Bi5O7NO3, for removal of methyl orange dye

Water Science & Technology ◽

10.2166/wst.2012.057 ◽

2012 ◽

Vol 65 (9) ◽

pp. 1632-1638 ◽

Cited By ~ 7

Author(s):

Abdul Halim Abdullah ◽

Eshraq Ahmed Abdullah ◽

Zulkarnain Zainal ◽

Mohd Zobir Hussein ◽

Tan Kar Ban

Keyword(s):

Methyl Orange ◽

Adsorption Process ◽

Precipitation Method ◽

Particle Model ◽

Batch Adsorption ◽

Particle Diffusion ◽

Order Kinetic ◽

Intra Particle Diffusion ◽

Methyl Orange Dye ◽

Operation Parameters

The adsorption of methyl orange dye from aqueous solution onto penta-bismuth hepta-oxide nitrate, Bi5O7NO3, synthesized by precipitation method, was studied in a batch adsorption system. The effects of operation parameters such as adsorbent dose, initial dye concentration, pH and temperature were investigated. The adsorption equilibrium and mechanism of adsorption was evaluated by Langmuir and Freundlich isotherm and different kinetic models, respectively. The results indicate that adsorption is highly dependent on all operation parameters. At optimum conditions, the adsorption capacity was found to be 18.9 mg/g. The adsorption data fits well with the Langmuir isotherm model indicating monolayer coverage of adsorbate molecules on the surface of Bi5O7NO3. The kinetic studies show that the adsorption process is a second-order kinetic reaction. Although intra-particle diffusion limits the rate of adsorption, the multi-linearity plot of intra-particle model shows the importance of both film and intra-particle diffusion as the rate-limiting steps of the dye removal. Thermodynamic parameters show that the adsorption process is endothermic, spontaneous and favourable at high temperature.

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Adsorption of Cr(VI) onto cross-linked chitosan-almond shell biochars: equilibrium, kinetic, and thermodynamic studies

Journal of Analytical Science & Technology ◽

10.1186/s40543-021-00288-0 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Türkan Altun ◽

Hüseyin Ecevit ◽

Yakup Kar ◽

Birsen Çiftçi

Keyword(s):

Particle Diffusion ◽

Order Kinetic ◽

Almond Shell ◽

Film Diffusion ◽

Composite Adsorbents ◽

Adsorption Capacities ◽

Adsorption Data ◽

Intra Particle Diffusion ◽

Order Kinetic Model ◽

Pseudo Second Order

AbstractIn this study, to remove Cr(VI) from the solution environment by adsorption, the almond shell was pyrolyzed at 400 and 500 °C and turned into biochar (ASC400 and ASC500) and composite adsorbents were obtained by coating these biochars with chitosan (Ch-ASC400 and Ch-ASC500). The resulting biochars and composite adsorbents were characterized using Fourier transform infrared (FTIR) spectroscopy; Brunauer, Emmett, and Teller (BET) surface area; scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDX); and the point of zero charge pH (pHpzc) analyses. The parameters affecting the adsorption were examined with batch adsorption experiments and the optimum parameters for the efficient adsorption of Cr(VI) in 55 mg L−1 solution were determined as follows; adsorbent dosages: 5 g L−1 for biochars, 1.5 g L−1 for composite adsorbents, contact time: 120 min, pH: 1.5. It was seen that the temperature did not affect the adsorption much. Under optimum conditions, Cr(VI) adsorption capacities of ASC400, ASC500, Ch-ASC400, and Ch-ASC500 adsorbents are 11.33, 11.58, 37.48, and 36.65 mg g−1, respectively, and their adsorption percentages are 95.2%, 97.5%, 94.3%, and 94.0%, respectively. Adsorption data were applied to Langmuir, Freundlich, Scatchard, Dubinin-Radushkevic, and Temkin isotherms and pseudo-first-order kinetic model, pseudo-second-order kinetic model, intra-particle diffusion model, and film diffusion model. The adsorption data fitted well to the Langmuir isotherm and pseudo-second-order kinetic models. From these results, it was determined that chemical adsorption is the dominant mechanism. Also, both intra-particle diffusion and film diffusion is effective in the adsorption rate. For all adsorbents, the Langmuir isotherm proved to be the most appropriate model for adsorption. The maximum monolayer adsorption capacities calculated from this model are 24.15 mg g−1, 27.38 mg g−1, 54.95 mg g−1, and 87.86 mg g−1 for ASC400, ASC500, Ch-ASC400, and Ch-ASC500, respectively. The enthalpy change, entropy change, and free energy changes during the adsorption process were calculated and the adsorption was also examined thermodynamically. As a result, adsorption occurs spontaneously for all adsorbents.

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Synthesis and Evaluation of the Ability of Poly(Methacrylic Acid-co-acrylamide)/nanoclay Composite Hydrogel in the Adsorption of Methylene Blue Dye

10.21203/rs.3.rs-1071501/v1 ◽

2021 ◽

Author(s):

Hamid Safarzadeh ◽

Seyed Jamaleddin Peighambardoust ◽

Seyed Hamed Mousavi ◽

Reza Mohammadi ◽

Rauf Foroutan ◽

...

Keyword(s):

Methylene Blue ◽

Adsorption Capacity ◽

Methacrylic Acid ◽

Adsorption Process ◽

Particle Diffusion ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Nanocomposite Hydrogel ◽

Cloisite 30B ◽

Intra Particle Diffusion

Abstract The performance of poly(methacrylic acid-co-acrylamide/nanoclay composite (poly(MAA-co-AAm)/NCC) hydrogel to adsorb methylene blue (MB) dye from aqueous solutions was investigated and the adsorption efficiency was improved by incorporating Cloisite 30B nanoclays in the adsorbent structure. The hydrogels were analyzed using FTIR, XRD, TGA, and SEM analysis. The effect of adsorbent dose, temperature, initial dye concentration, contact time, and pH on the efficiency of the adsorption process was investigated. Adsorption efficiencies of 98.57 and 97.65% were obtained for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels, respectively. Kinetic study revealed that the adsorption process followed pseudo-first-order kinetic model and α-parameter values of 6.558 and 1.113 mg/g.min were obtained for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels, respectively indicating a higher ability of nanocomposite hydrogel in adsorbing MB-dye. In addition, the results of the intra-particle diffusion model showed that various mechanisms such as intra-particle diffusion and liquid film penetration are important in the adsorption. The Gibbs free energy parameter of adsorption process showed negative values of -256.52 and -84.071 J/mol.K for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels indicating spontaneous nature of the adsorption. The results of enthalpy and entropy showed that the adsorption process was exothermic and random collisions were reduced during the adsorption. The equilibrium data for the adsorption process using poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels followed Freundlich and Langmuir isotherm models, respectively. The maximum adsorption capacity values of 32.83 and 21.92 mg/g were obtained for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels, respectively. Higher adsorption capacity of nanocomposite hydrogel was attributed to the presence of Cloisite 30B clay nanoparticles in its structure. In addition, results of RL, n, and E parameters showed that the adsorption process was performed optimally and physically.

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Adsorption of p-Cresol by Mesoporous Activated Carbon. II. Mechanism studies and data modeling

Revista de Chimie ◽

10.37358/rc.17.3.5486 ◽

2017 ◽

Vol 68 (3) ◽

pp. 496-499

Author(s):

Mihaela Neagu ◽

Daniela Roxana Popovici ◽

Loredana Elena Vijan ◽

Catalina Calin

Keyword(s):

Activated Carbon ◽

Adsorption Mechanism ◽

Adsorption Process ◽

Point Of Zero Charge ◽

Particle Diffusion ◽

Ftir Analysis ◽

Film Diffusion ◽

Mesoporous Activated Carbon ◽

Boehm Titration ◽

Intra Particle Diffusion

In this work, the adsorption mechanism of p-cresol from aqueous solution onto mesoporous activated carbon was investigated. The mechanism of the adsorption process was determined from Weber-Morris and Boyd models. By graphical and statistical analysis was demonstrated that both film-diffusion and intra-particle diffusion are concurrent in adsorption mechanism. The adsorption mechanism of p-cresol onto mesoporous activated carbon was sustained by FTIR analysis, Boehm titration and the point of zero charge of the GAC.

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Characterization of hydroxybenzoic acid chelating resins: Equilibrium, kinetics, and isotherm profiles for Cd(II) and Pb(II) uptake

Journal of the Serbian Chemical Society ◽

10.2298/jsc100601081s ◽

2011 ◽

Vol 76 (6) ◽

pp. 903-922 ◽

Cited By ~ 8

Author(s):

Bhavna Shah ◽

Ajay Shah ◽

Ritesh Tailor

Keyword(s):

Rate Constant ◽

Metal Ion ◽

Diffusion Rate ◽

Ion Concentration ◽

Particle Diffusion ◽

Specific Rate ◽

Hydroxybenzoic Acid ◽

Sorption Data ◽

Intra Particle Diffusion ◽

Diffusion Rate Constant

Chelating ion-exchange resins were synthesized by polycondensation of ortho/para hydroxybenzoic acid with resorcinol/catechol employing formaldehyde as cross-linking agent at 80?5?C in DMF. The resins were characterized by FTIR and XRD. The uptake behaviour of synthesized resins for Cd(II) and Pb(II) ions have been studied depending on contact time, pH, metal ion concentration and temperature. The sorption data obtained at optimized conditions were analyzed by the Langmuir and Freundlich isotherms. Experimental data of all metal-resin system were best represented by the Freundlich isotherm. The maximum obtained sorption capacity for cadmium was 69.53 mg g-1 and 169.32 mg g-1 for Lead. The adsorption process follows first order kinetics and the specific rate constant Kr was obtained by the application of the Lagergan equation. Thermodynamic parameters ?Gads, ?Sads and ?Hads were calculated for the metal-resin systems. The external diffusion rate constant (Ks) and the intra-particle diffusion rate constant (Kid) were calculated by the Spahn-Schlunder and Weber-Morris models, respectively. The sorption process was found to follow an intra-particle diffusion phenomenon.

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Synthesis of Polymer-Based Magnetic Nanocomposite for Multi-Pollutants Removal from Water

Polymers ◽

10.3390/polym13111742 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1742

Author(s):

Fatimah Mohammed Alzahrani ◽

Norah Salem Alsaiari ◽

Khadijah Mohammedsaleh Katubi ◽

Abdelfattah Amari ◽

Faouzi Ben Rebah ◽

...

Keyword(s):

Adsorption Process ◽

Magnetic Composite ◽

Sample Treatment ◽

Water Type ◽

X Ray Diffraction ◽

Solution Ph ◽

Vibration Sample Magnetometer ◽

Pollutants Removal ◽

Co Precipitation ◽

Red Dye

A magnetic polymer-based nanocomposite was fabricated by the modification of an Fe3O4/SiO2 magnetic composite with polypyrrole (PPy) via co-precipitation polymerization to form PPy/Fe3O4/SiO2 for the removal of Congo red dye (CR) and hexavalent chromium Cr(VI) ions from water. The nanocomposite was characterized using various techniques including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), vibration sample magnetometer, and thermogravimetric analysis (TGA). The results confirm the successful fabrication of the nanocomposite in the size of nanometers. The effect of different conditions such as the contact time, adsorbent dosage, solution pH, and initial concentration on the adsorption process was investigated. The adsorption isotherm suggested monolayer adsorption of both contaminants over the PPy/Fe3O4/SiO2 nanocomposite following a Langmuir isotherm, with maximum adsorption of 361 and 298 mg.g−1 for CR dye and Cr(VI), respectively. Furthermore, the effect of water type on the adsorption process was examined, indicating the applicability of the PPy/Fe3O4/SiO2 nanocomposite for real sample treatment. Interestingly, the reusability of the nanocomposite for the removal of the studied contaminants was investigated with good results even after six successive cycles. All results make this nanocomposite a promising material for water treatment.

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