Adsorption of As(III), Pb(II), and Zn(II) from Wastewater by Sodium Alginate Modified Materials

Sodium alginate (SA), polyvinyl oxide (PEO), and ceramic nanomaterials were used to prepare alginate composite gel. The present study examined the removal rate and adsorption capacity of alginate composite gel for removal of wastewater As(III), Pb(II), and Zn(II). Batch experiments were conducted to study the influence of experimental parameters such as pH and temperature, as well as the mechanism of As(III), Pb(II), and Zn(II) adsorption with the new adsorbent. The results showed the high efficiency of sodium alginate composite gel for removal of wastewater As(III), Pb(II), and Zn(II). Under the condition of the best liquid-solid ratio and the contact time, the removal rates of As(III), Pb(II), and Zn(II) were 67.42%, 95.31%, and 93.96%, respectively. The pseudo-second-order kinetic equation was superior to fit the adsorption kinetics process. The isothermal adsorption models of As(III) and Pb(II) fitted well with the Freundlich model, and Zn(II) fitted well with the Langmuir model. The results of SEM, EDS, XPS, and FTIR analyses revealed that the adsorption process occurred mainly via chemisorption. The results of the present study suggest that new adsorbents can be effectively utilized for As(III), Pb(II), and Zn(II) removal from water.

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Adsorption of Cu (II) and Cd (II) from Wastewater by Sodium Alginate Modified Materials

Journal of Chemistry ◽

10.1155/2020/5496712 ◽

2020 ◽

Vol 2020 ◽

pp. 1-13

Author(s):

Yingying Zhao ◽

Linchuan Zhan ◽

Zhongjun Xue ◽

Kianpoor Kalkhajeh Yusef ◽

Hongxiang Hu ◽

...

Keyword(s):

Sodium Alginate ◽

Contact Time ◽

Order Kinetic ◽

Adsorption Model ◽

Solution Ph ◽

Isothermal Adsorption ◽

Solid Ratio ◽

Composite Gel ◽

Pseudo Second Order ◽

Polluted Waters

Natural macromolecule adsorbing materials are alternatives for remediation of heavy metals’ polluted waters. In this study, sodium alginate composite gel (SACL) was synthesized from sodium alginate (SA), polyethylene glycol oxide (PEO), and nanomaterials to remove wastewater Cu (II) and Cd (II). The adsorption efficiency of SACL was analysed in relation to the contact time, initial concentrations of metal ions, temperature, adsorbent dosage, and solution pH. Three models, i.e., kinetic model, isothermal adsorption model, and thermodynamic model, were used to fit the experimental data. Our results showed that the highest removal rates of Cu (II) and Cd (II) from wastewater were 96.8% and 78%, respectively, under the condition of the best liquid-solid ratio of 12.5 ml·g−1, and the contact time of 180 min (25°C). Overall, the SACL adsorption of Cu (II) and Cd (II) was spontaneous. The adsorption kinetics and the isothermal adsorption were fitted well with the pseudo-second-order kinetic equation and Langmuir equation, respectively. Combined with SEM-EDS and FTIR analysis, results suggested that SACL adsorbs wastewater Cu (II) and Cd (II) mainly through chemical reaction on its surface area. Altogether, this work concludes on SACL as an efficient and ecofriendly adsorbent for wastewater Cu (II) and Cd (II).

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Efficient Removal of Ni(II) from Aqueous Solution by Date Seeds Powder Biosorbent: Adsorption Kinetics, Isotherm and Thermodynamics

Processes ◽

10.3390/pr8081001 ◽

2020 ◽

Vol 8 (8) ◽

pp. 1001

Author(s):

Abubakr Elkhaleefa ◽

Ismat H. Ali ◽

Eid I. Brima ◽

A. B. Elhag ◽

Babiker Karama

Keyword(s):

Physical Adsorption ◽

Solution Concentration ◽

Order Kinetic ◽

Adsorption Models ◽

Freundlich Model ◽

Effects Of Ph ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Date Seeds Powder ◽

Experimental Findings

Adsorption investigations in batch approaches were performed to explore the biosorption of Ni(II) ions from aqueous solutions on date seeds powder. The effects of pH, particle size, initial concentration of Ni(II) ions, adsorbent mass, temperature, and contact on the adsorption efficacy were studied. The maximum removal obtained was 90% for an original Ni(II) ion solution concentration of 50 ppm was attained at pH 7 after 30 min and with 0.30 g of an added adsorbent. The four adsorption models, namely Freundlich, Langmuir, Dubinin–Radushkevich (D–R), and Temkin were examined to fit the experimental findings. The adsorption system obeys the Freundlich model. The system was found to follow the pseudo-second order kinetic model. Thermodynamic factors; entropy (ΔS°), enthalpy (ΔH°), and Gibbs free energy (ΔG°) changes were also assessed. Results proved that adsorption of Ni(II) ions is exothermic and spontaneous. Sticking probability value was found to be less than unity, concluding that the process is dominated by physical adsorption.

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The Research of Absorption on U(VI) by Nanometer α-Fe2O3 Microsphere

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1010-1012.817 ◽

2014 ◽

Vol 1010-1012 ◽

pp. 817-820

Author(s):

Qing Peng Wei ◽

Shi You Li ◽

Shui Bo Xie ◽

Jian Biao Liao ◽

Yin Li

Keyword(s):

Adsorption Process ◽

Removal Rate ◽

Order Equation ◽

Oxide Content ◽

Solution Ph ◽

Isothermal Adsorption ◽

Adsorption Models ◽

Adsorption Capacities ◽

Adsorption Data ◽

Pseudo Second Order

Adsorption of uranium(VI) ions by Sodium alginate (SA) immobilized nano-α-Fe2O3 particles beads were investigated in the batch experiments.The influences of the nano-ferric oxide content in beads，cross-linking time, solution pH, initial U(VI) concentration, temperature and contact time on U(VI) sorption were studied. The results indicated that the adsorption capacities are strongly affected by the solution pH, the best adsorption rate can be thought of to be at pH 3. The adsorption was rather fast in the initial 1.5 h, and the equilibrium was established in 9 h with the sorption capacity 2.64 mg/g. The kinetic adsorption data was simulated better by a pseudo-second-order equation. The removal rate increased slowly with temperature ascending . The adsorption process conformed to the Langmuir and Freundlich isothermal adsorption models, and the data fitted the latter better.

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Synthesis and application of surface-modified NiFe nanoparticles as a new magnetic nano adsorbent for the removal of nickel ions from aqueous solution

Water Science & Technology ◽

10.2166/wst.2017.453 ◽

2017 ◽

Vol 76 (10) ◽

pp. 2851-2857 ◽

Cited By ~ 2

Author(s):

Yan Liu ◽

Xiaoyi Shen

Keyword(s):

Aqueous Solution ◽

Sodium Citrate ◽

Diffusion Processes ◽

Order Kinetic ◽

Adsorption Models ◽

Freundlich Model ◽

Nickel Ions ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Surface Modified

Abstract Surface-modified magnetic Ni2.33Fe alloy nanoparticles were prepared using a hydrothermal method. Thermogravimetric analysis (TG) and Fourier transform infrared spectroscopy (FTIR) tests demonstrated that the surface was successfully modified by sodium citrate. The surface-modified particles can be used for removing nickel ions from aqueous solution. The adsorption kinetics studies were performed and the pseudo-second-order kinetic model successfully described the kinetic data. The diffusion model indicated the adsorption was regulated by both surface and intraparticle diffusion processes. The Freundlich and Langmuir adsorption models were adopted for the mathematical description of adsorption equilibrium, and it was found that the experimental data fitted very well to the Freundlich model.

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Study on the Adsorption of Livestock Wastewater by Bentonite Coated Chitosan

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.368 ◽

2011 ◽

Vol 356-360 ◽

pp. 368-372

Author(s):

Hong Shao ◽

Di Zhang

Keyword(s):

Removal Rate ◽

Orthogonal Experiment ◽

Ammonia Nitrogen ◽

Raw Material ◽

Order Kinetic ◽

Adsorption Model ◽

Livestock Wastewater ◽

Isothermal Adsorption ◽

Preparation Conditions ◽

Pseudo Second Order

The bentonite coated chitosan which was prepared of natural bentonite used as raw material and chitosan used as modifying agent applied in the treatment of livestock wastewater. The optimal preparation conditions were obtained and the removal rate of the ammonia nitrogen and COD were 73.09% and 88.94% respectively which raw concentration were 27520mg/L and 2060mg/L by orthogonal experiment. Langmuir isothermal adsorption model and the pseudo-second-order kinetic equation could describe the adsorption process accurately.

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Preparation of cationic waste paper and its application in poisonous dye removal

Water Science & Technology ◽

10.2166/wst.2013.140 ◽

2013 ◽

Vol 67 (11) ◽

pp. 2560-2567 ◽

Cited By ~ 8

Author(s):

Fan Yang ◽

Xiaojie Song ◽

Lifeng Yan

Keyword(s):

Low Cost ◽

Aqueous Suspension ◽

Order Kinetic ◽

Acid Orange 7 ◽

Anionic Dyes ◽

Experimental Conditions ◽

Adsorption Models ◽

Acid Orange ◽

Initial Ph ◽

Pseudo Second Order

Cationic paper was prepared by reaction of paper with 2,3-epoxypropyltrimethylammonium chloride in aqueous suspension, and tested as low-cost adsorbent for wastewater treatment. The experimental results revealed that anionic dyes (Acid Orange 7, Acid Red 18, and Acid Blue 92) were adsorbed on the cationic paper nicely. The maximum amount of dye Acid Orange 7 adsorbed on cationic paper was 337.2 mg/g in experimental conditions. The effects of initial dye concentration, temperature, and initial pH of dye solution on adsorption capacity of cationic paper were studied. The pseudo-first-order and pseudo-second-order kinetic models were applied to describe the kinetic data. The Freundlich and Langmuir adsorption models were used to describe adsorption equilibrium. The thermodynamic data indicated that the adsorption process of dye on cationic paper occurred spontaneously.

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Effects of tall fescue biochar on the adsorption behavior of desethyl-atrazine in different types of soil

BioResources ◽

10.15376/biores.16.2.3575-3595 ◽

2021 ◽

Vol 16 (2) ◽

pp. 3575-3595

Author(s):

Wanting Li ◽

Ruifeng Shan ◽

Yuna Fan ◽

Xiaoyin Sun

Keyword(s):

Tall Fescue ◽

Adsorption Process ◽

Exothermic Reaction ◽

Equilibrium Concentration ◽

Black Soil ◽

Adsorption Behavior ◽

Order Kinetic ◽

Isothermal Adsorption ◽

Order Kinetic Model ◽

Pseudo Second Order

Desethyl-atrazine (DEA) is a metabolite of atrazine that exerts a considerable influence on the environment. In this study, tall fescue biochar was prepared by pyrolysis at 500 °C, and batch experiments were conducted to explore its effect on the adsorption behavior of DEA in red soil, brown soil, and black soil. The addition of biochar increased the equilibrium amount of DEA adsorption for the three soil types. A pseudo-second-order kinetic model most closely fit the DEA adsorption kinetics of the three soils with and without biochar, with a determination coefficient (R2) of 0.962 to 0.999. The isothermal DEA adsorption process of soils with and without biochar was optimally described by the Freundlich and Langmuir isothermal adsorption models with R2 values of 0.98 and above. The DEA adsorption process in the pristine soil involved an exothermic reaction, which became an endothermic reaction after the addition of biochar. Partitioning was dominant throughout the entire DEA adsorption process of the three pristine soils. Conversely, in soils with biochar, surface adsorption represented a greater contribution toward DEA adsorption under conditions of low equilibrium concentration. The overall results revealed that the tall fescue biochar was an effective adsorbent for DEA polluted soil.

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Removal of Zn(II) By Magnetic Composite Adsorbent: Synthesis, Performance, And Mechanism

10.21203/rs.3.rs-1113178/v1 ◽

2021 ◽

Author(s):

Shuang Yi ◽

Binqin Bao ◽

Weifeng Song ◽

MuDdan Liu

Keyword(s):

Photoelectron Spectroscopy ◽

Experimental Results ◽

Ion Concentration ◽

Magnetic Composite ◽

Order Kinetic ◽

Exchange Effect ◽

Composite Adsorbent ◽

Composite Gel ◽

Infrared Spectrometer ◽

Pseudo Second Order

Abstract In this study, L-methionine and nano-Fe3O4 were encapsulated and cured on sodium alginate by the ionic cross-linking method to form magnetic composite gel spheres (SML). The influence of adsorbent dosages, pH, reaction time, and initial ion concentration on the ability of the gel spheres to adsorb Zn(II) was investigated. The experimental results indicated that under the optimum conditions, the maximum amount of Zn(II) adsorbed by the adsorbent gel spheres reached 86.84 mgˑg-1. The experimental results of adsorption indicate that the reaction process of this adsorbent fits well with the Langmuir and pseudo-second-order kinetic models and is a heat absorption reaction. The results of the adsorption investigation of the coexistence system showed that the adsorbent would preferentially adsorb Pb(II), and the adsorption efficiency of Zn(II) decreased when the concentration of interfering ions increased. The structure of this adsorbent and the adsorption mechanism were investigated by Fourier transform infrared spectrometer, thermal gravimetric analyzer, vibrating sample magnetometer, scanning electron microscope, Brunner-Emmet-Teller measurements, and X-ray photoelectron spectroscopy. The results show that this magnetic composite adsorbent is a mesoporous material with superior adsorption performance, and the amino and carboxyl groups on it react with Zn(II) via ligand chelation; the ion exchange effect of Ca(II) also plays a role. The desorption-adsorption experiments of the adsorbent indicated that the adsorption amount of Zn(II) was maintained at a higher level after several cycles, and the loss of Fe was approximately 0.2%. In summary, SML is an ideal adsorbent for environmental protection.

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Removal of Lead(II) from Synthetic Wastewater by Lavandula pubescens Decne Biosorbent: Insight into Composition–Adsorption Relationship

Applied Sciences ◽

10.3390/app10217450 ◽

2020 ◽

Vol 10 (21) ◽

pp. 7450

Author(s):

Ali Q. Alorabi ◽

Fahad A. Alharthi ◽

Mohamed Azizi ◽

Nabil Al-Zaqri ◽

Adel El-Marghany ◽

...

Keyword(s):

Ion Concentration ◽

Wild Plant ◽

Synthetic Wastewater ◽

Gas Chromatography Mass Spectrometry ◽

Gas Liquid Chromatography ◽

Order Kinetic ◽

Freundlich Model ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Best Fit

In this work, the widely-abundant, cheap, wild plant Lavandula pubescens Decne was evaluated as an adsorbent for removing Pb(II) ions from wastewater. The chemical composition of the plant was partially isolated and characterized by the corresponding techniques, including gas chromatography–mass spectrometry, gas liquid chromatography, and FTIR spectroscopy. The adsorption capacity of the dried plant material for Pb(II) ions increased with increasing contact time, initial ion concentration, and temperature, while it decreased with increasing adsorbent dosage. The optimum condition for Pb(II) adsorption was determined as 550 mg/L initial metal concentration, pH ≤ 7, and 90 min of contact. The best fit for Pb(II) adsorption isotherms was the linear form of the Freundlich model; however, the maximum capacity indicated by Langmuir was 91.32 mg/g. The experimental data fit better the pseudo-second-order kinetic model (R2 = 0.969), suggesting chemisorption process. Thermodynamic data revealed an endothermic, nonspontaneous, and adsorption process favored at higher concentrations.

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Preparation and Adsorption Properties of Biochar/g-C3N4 Composites for Methylene Blue in Aqueous Solution

Journal of Nanomaterials ◽

10.1155/2019/2394184 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8 ◽

Cited By ~ 3

Author(s):

Xiaodong Li

Keyword(s):

Methylene Blue ◽

Thermodynamic Parameters ◽

Raw Materials ◽

Order Kinetic ◽

Adsorption Effect ◽

Freundlich Model ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Ft Ir ◽

Doping Ratio

Using straw and urea as raw materials, biochar (BC) and g-C3N4 were prepared by oxygen-free pyrolysis at 300°C and 550°C. BC/g-C3N4 was prepared by loading different amounts of g-C3N4 onto the surface of biochar and characterized by SEM and FT-IR. The adsorption effect on methylene blue (MB) was investigated from the aspects of dosage and pH. The studies of adsorption equilibrium isotherms and the kinetic and the thermodynamic parameters on the BC/g-C3N4 adsorbents are discussed. The results showed that BC/g-C3N4 0.16 g/L with a doping ratio of 1 : 3 was added to the MB solution with an initial concentration of 50 mg/L and pH=11. The adsorption rate and adsorption amount were 96.72% and 302.25 mg/g, respectively. The adsorption process included surface adsorption and intraparticle diffusion, which conformed to the pseudo-second-order kinetic model and Langmuir-Freundlich model. Thermodynamic parameters (ΔG0<0, ΔH0>0, and ΔS0>0) showed that the adsorption reaction is spontaneous, which positively correlated with temperature.

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