Mechanism and kinetics of adsorption and removal of heavy metals from wastewater using nanomaterials

2021 ◽  
Author(s):  
Simranjeet Singh ◽  
Dhriti Kapoor ◽  
Sutripto Khasnabis ◽  
Joginder Singh ◽  
Praveen C. Ramamurthy
Keyword(s):  
Heavy Metals ◽  
Kinetics Of Adsorption ◽  
Removal Of Heavy Metals ◽  
Mechanism And Kinetics ◽  
Kinetics Of

scholarly journals Biosorption of Nickel (II) from Aqueous Solutions onto Pistachio Hull Waste as a Low-Cost Biosorbent

2019 ◽  
Vol 5 (2) ◽  
pp. 447 ◽  
Author(s):  
Majid Zamani Beidokhti ◽  
Seyed Taghi (Omid) Naeeni ◽  
Mohammad Sajjad AbdiGhahroudi
Keyword(s):  
Heavy Metals ◽  
Low Cost ◽  
Agricultural Waste ◽  
Process Time ◽  
Kinetics Of Adsorption ◽  
Initial Concentration ◽  
Hull Waste ◽  
Removal Of Heavy Metals ◽  
Pseudo Second Order ◽  
Kinetics Of

There are many different industrial wastewater containing heavy metals that contribute to environmental pollution and raw agricultural waste is an effective adsorbent for the removal of heavy metals. The adsorption behavior of pistachio hull powder (PHP) as a low-cost adsorbent, with respect to nickel (II) ions, has been studied in order to consider its application to the purification of metal finishing wastewater. In this work, adsorption of nickel on pistachio hull has been studied by batch techniques. The adsorption depends on the process time, the pH of the solution, initial concentration of metals and the adsorbent concentration in the suspension. The kinetics of adsorption were relatively fast, reaching equilibrium for less than 60 minutes. Kinetic and isotherm modeling studies demonstrated that the experimental data best fit a pseudo-second order and Freundlich model, respectively. The maximum Langmuir adsorption capacity was 14 mg/g. The optimum pH required for maximum adsorption was found to be 4-6. The initial concentration of the adsorbate and the concentration of pistachio hull strongly affect the process. No influence of particle size was evidenced. A degree of adsorption higher than 75% can be achieved for nickel (II) ions.

Study of the Cu(II) removal from aqueous solutions by adsorption on titania

2013 ◽  
Vol 12 (3) ◽  
pp. 239-247
Keyword(s):  
Heavy Metals ◽  
Ionic Strength ◽  
Toxic Metals ◽  
Low Cost ◽  
Lateral Interaction ◽  
Tio2 Surface ◽  
High Toxicity ◽  
Removal Of Heavy Metals ◽  
Solution Parameters ◽  
Kinetics Of

The removal of heavy metals from wastewaters is a matter of paramount importance due to the fact that their high toxicity causes major environmental pollution problems. One of the most efficient, applicable and low cost methods for the removal of toxic metals from aqueous solutions is that of their adsorption on an inorganic adsorbent. In order to achieve high efficiency, it is important to understand the influence of the solution parameters on the extent of the adsorption, as well as the kinetics of the adsorption. In the present work, the adsorption of Cu(II) species onto TiO2 surface was studied. It was found that the adsorption is a rapid process and it is not affected by the value of ionic strength. In addition, it was found that by increasing the pH, the adsorbed amount of Cu2+ ions and the value of the adsorption constant increase, whereas the value of the lateral interaction energy decreases.

Kinetics of Heavy Metals Adsorption on Gravels Derived From Subsurface Flow Constructed Wetland

2020 ◽  
pp. 193-213
Author(s):  
Celestin Defo ◽  
Ravinder Kaur
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Contact Period ◽  
Batch Experiments ◽  
Removal Of Heavy Metals ◽  
Pseudo Second Order ◽  
Adsorption Rates ◽  
Kinetics Of ◽  
Best Fit ◽  
Concentration Levels

Adsorption kinetics of Ni, Cr, and Pb on gravels collected from constructed wetland was studied at varied metal concentrations and contact period for estimating the removal of heavy metals from wastewater. Batch experiments were conducted by shaking 120 ml of metal solutions having 5 concentration levels each of Ni (1.0, 2.0, 3.5, 5.0 and 6.0 mg l-1), Cr (1.0, 2.0, 3.0, 4.5 and 6.0 mg l-1), and Pb (1.0, 3.0, 6.0, 8.0 and 12.0 mg l-1) with 50 g of gravels for as function of time. Adsorption of Ni, Cr, and Pb on gravels ranged from 34.8 to 47.2, 42.7-54.9, and 47.5-56.9%, indicating their removal in the order: Pb > Cr > Ni. Freundlich model showed a good fit for Ni and Cr (R2>0.9) while Langmuir model fitted better for Pb (R2= 0.7). The pseudo-second-order model showed the best fit to simulate the adsorption rates of these metals on gravel.

scholarly journals Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)

Clay Minerals ◽  
2020 ◽  
Vol 55 (2) ◽  
pp. 184-193 ◽  
Author(s):  
Nia Gray-Wannell ◽  
Peter J. Holliman ◽  
H. Christopher Greenwell ◽  
Evelyne Delbos ◽  
Stephen Hillier
Keyword(s):  
Ph Dependence ◽  
Halloysite Nanotubes ◽  
Tube Length ◽  
Phosphate Adsorption ◽  
Kinetics Of Adsorption ◽  
Soil Systems ◽  
A Value ◽  
Cylindrical Form ◽  
Mechanism And Kinetics ◽  
Kinetics Of

AbstractThe adsorption and retention of phosphates in soil systems is of wide environmental importance, and understanding the surface chemistry of halloysite (a common soil clay mineral) is also of prime importance in many emerging technological applications of halloysite nanotubes (HNTs). The adsorption of phosphate anions on tubular halloysite (7 Å) has been studied to gain a greater understanding of the mechanism and kinetics of adsorption on the surface of HNTs. Two well-characterized tubular halloysites with differing morphologies have been studied: one polygonal prismatic and one cylindrical, where the cylindrical form has a greater surface area and shorter tube length. Greater phosphate adsorption of up to 42 μmol g–1 is observed on the cylindrical halloysite when compared to the polygonal prismatic sample, where adsorption reached a maximum of just 15 μmol g–1 compared to a value for platy kaolinite (KGa-2) of 8 μmol g–1. Phosphate adsorption shows strong pH dependence, and the differences in phosphate sorption between the prismatic and cylindrical morphologies suggest that phosphate absorption does not occur at the same pH-dependent alumina edge sites and that the lumen may have a greater influence on uptake for the cylindrical form.

Removal of Heavy Metals by Using Chitosan/ Poly (Acryl Amide-Acrylic Acid) Hydrogels: Characterization and Kinetic Study

2021 ◽  
Vol 19 (2) ◽  
pp. 31-37
Author(s):  
Layth S. Jasim ◽  
Aseel M. Aljeboree
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Reaction Order ◽  
Time Intervals ◽  
Freundlich Isotherms ◽  
Removal Of Heavy Metals ◽  
Ft Ir ◽  
Structural Surface ◽  
Kinetics Of ◽  
Kinetics Of Sorption

In this Study, hydrogel P(CH/AA-co-AM) was prepared, identification and utilized as an efficient absorbent to eliminate Cr (III) and Cd (II) ions from the aqueous solution. The adsorption of these ions follows Freundlich isotherms. Due to greater activity surface of the hydrogel in adsorption of the contaminants, they can be utilized for elimination of the mentioned ions from water. Therefore, we characterized structural, surface and thermal properties of the prepared materials with technique: TGA, FE-SEM and FT-IR. Moreover, we implemented the kinetics of sorption with regard to the amounts of the metal sorbet at distinct time intervals and thus examined the modeling of the isotherm and kinetic curves. Finally, we computed the reaction order as well as rate constant.

scholarly journals A Study on Adsorption of Heavy Metals with Zeolite and FeS Media

2020 ◽  
Vol 42 (7) ◽  
pp. 349-359
Author(s):  
Gimin Lee ◽  
Gyuri Kim ◽  
Sungkyu Choi ◽  
Tae-jin Lee
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Reaction Kinetics ◽  
Adsorption Capacity ◽  
Second Order ◽  
Maximum Adsorption Capacity ◽  
Adsorption Characteristics ◽  
Removal Of Heavy Metals ◽  
Pseudo Second Order ◽  
Kinetics Of

Objectives:Adsorption characteristics in aqueous solution were investigated to effectively remove heavy metals by the crystallization of FeS and reaction kinetics were analyzed to compare with heavy metal adsorption characteristics of zeolite.Methods:The adsorption characteristics of each media were analyzed using Langmuir adsorption isotherm, and the adsorption reaction kinetics of heavy metals (Pb, Cu, Zn) on zeolite and FeS media were analyzed by a pseudo-first or pseudo-second order reaction kinetics.Results and Discussion:The maximum adsorption capacity of zeolite was highest in Pb, and the adsorption preference was in the order of Pb>Cu>Zn. In the case of FeS media, Cu was found to have a higher adsorption capacity than Pb or Zn, and the adsorption preference was observed to be Cu>Pb>Zn. It was found that the adsorption mechanism is based on chemical adsorption (chemisorption) because adsorption of each heavy metal onto zeolite or FeS media is more suitable for pseudo-second order kinetics.Conclusions:It was found that the removal of heavy metals through FeS media has a different pattern from zeolite, and when comparing the adsorption capacity of each media, it was found that FeS media is more effective for Zn or Cu except Pb.

scholarly journals Study of the Interaction of Heavy Metals (Cu(II), Zn(II)) Ions with a Clay Soil of the Region of Naima-Tiaret-Algeria

2020 ◽  
Vol 15 (3) ◽  
pp. 765-785
Author(s):  
Taibi Mohamed ◽  
Elaziouti Abdelkader ◽  
Laouedj Nadjia ◽  
Dellal Abdelkader
Keyword(s):  
Heavy Metals ◽  
Ion Exchange ◽  
Adsorption Process ◽  
Layer Structure ◽  
Retention Mechanism ◽  
Basal Spacing ◽  
Kinetics Of Adsorption ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of

The RM (RM stands for the pristine clay) collected from sites in the Naima-Tiaret-Algeria and its purified phase TM (TM stands for the treated clay) were characterized using XRF, XRD, FT−IR, SEM−EDX, and DC electrical conductivity techniques. The as-prepared clays were used as potential adsorbents for the removal of Cu2+ and Zn2+ metals ions. Highly purified clay TM, exhibiting a basal, spacing of 25.83 Å and CEC of 51 meq/100 g, was obtained. The type of interstratified I/M in the studied sites is S=1, based on the calculation method of Watanabe. The percentage of illite type S=1 is between 80−85% illite. The adsorption equilibrium was established in 60 min with the capacities of 28.57 and 24.39 mg/g for Cu2+ onto RM, 32.25 and 4.95 mg/g for Zn2+ in the presence of TM. D-R isotherm model was more suitable with the adsorption process than Freundlich and Langmuir models suggesting the ion exchange nature of the retention mechanism in most cases (E > 8 kJ/mol). Pseudo second-order model best described the kinetics of adsorption process. The adsorption mechanism was mainly monitored by ion exchange mechanism between exchangeable interlayer cations (Na) in the interstratified I/M and Cu2+ or Zn2+ metals from aqueous matrix. Further, the release of H+ ions from the edge of the layer structure in acidic environments promote the adsorption of heavy metals onto the surfaces interstratified I/M clay soils via electrostatic attraction. Copyright © 2020 BCREC Group. All rights reserved 

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