A sorbent based on polyvinyl formal and polyacrylic acid for the removal of heavy metals from water solutions

Voprosy Khimii i Khimicheskoi Tekhnologii ◽

10.32434/0321-4095-2020-133-6-75-82 ◽

2020 ◽

pp. 75-82

Keyword(s):

Experimental Data ◽

Heavy Metals ◽

Polyacrylic Acid ◽

Kinetic Models ◽

High Efficiency ◽

Radical Copolymerization ◽

Water Solutions ◽

Polyvinyl Formal ◽

Removal Of Heavy Metals ◽

Ph Range

The characteristics of a hybrid pH-sensitive hydrogel sorbent based on polyvinyl formal and polyacrylic acid, synthesized by radical copolymerization, were investigated in the process of removing copper (II), zinc (II) and nickel (II) metal ions from water solutions. A high efficiency of the extraction (up to 96%) of metal cations (Cu(II)>Zn(II)Ni(II)) was reveled at their concentration of up to 250 mg L–1 in the pH range of 5.8 to 6.8. The experimental data were analyzed by using theoretical kinetic models and adsorption isotherms. The developed polymer sorbent was shown to be promising for removing heavy metals, even after its multiple regeneration.

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Application of Immobilized Fungi Phanerochaete chrysosporium in Removal of Heavy-Metals from Wastewater

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.779-780.1674 ◽

2013 ◽

Vol 779-780 ◽

pp. 1674-1677 ◽

Cited By ~ 2

Author(s):

Dan Lian Huang ◽

Guang Ming Zeng ◽

Piao Xu ◽

Cui Lai ◽

Mei Hua Zhao ◽

...

Keyword(s):

Heavy Metals ◽

Iron Oxide ◽

Magnetic Nanoparticles ◽

Phanerochaete Chrysosporium ◽

High Efficiency ◽

Metal Removal ◽

Heavy Metal Removal ◽

Removal Of Heavy Metals ◽

Iron Oxide Magnetic Nanoparticles ◽

Ca Alginate

Immobilized microbe technologies are expected to be effectively used in wastewater treatment. Removal of heavy-metals from wastewater by immobilized Phanerochaete chrysosporium (Pc) with Ca-alginate and iron oxide magnetic nanoparticles (MNPs) was studied. The results showed that a biosorbent as Pc immobilized by Ca-alginate and iron oxide magnetic nanoparticles was successfully developed. And the iron oxide magnetic nanoparticles played an important role in the increase of biosorption capacity of Pc. Energy dispersive spectrometer (EDS) analysis confirmed that metal ions adsorbed to the surface of the biosorbents were partly transmitted to the interior of biosorbents, mainly embedded with iron oxide nanoparticles and Ca-alginate. Moreover, it was found that MNPs-Ca-alginate immobilized Pc showed a good affinity to various heavy metals, such as Pb(II), Zn(II), Cd(II) or Mg(II) and so on. The results proved the high efficiency of the biosorbents for heavy-metal removal and its potential application in the treatment of metal-containing wastewater.

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Heavy Metal Adsorption ontoKappaphycussp. from Aqueous Solutions: The Use of Error Functions for Validation of Isotherm and Kinetics Models

BioMed Research International ◽

10.1155/2015/126298 ◽

2015 ◽

Vol 2015 ◽

pp. 1-13 ◽

Cited By ~ 24

Author(s):

Md. Sayedur Rahman ◽

Kathiresan V. Sathasivam

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Aqueous Solutions ◽

Kinetic Models ◽

Adsorption Process ◽

Low Cost ◽

Metal Adsorption ◽

Red Seaweed ◽

Error Functions ◽

Removal Of Heavy Metals

Biosorption process is a promising technology for the removal of heavy metals from industrial wastes and effluents using low-cost and effective biosorbents. In the present study, adsorption of Pb2+, Cu2+, Fe2+, and Zn2+onto dried biomass of red seaweedKappaphycussp. was investigated as a function of pH, contact time, initial metal ion concentration, and temperature. The experimental data were evaluated by four isotherm models (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich) and four kinetic models (pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models). The adsorption process was feasible, spontaneous, and endothermic in nature. Functional groups in the biomass involved in metal adsorption process were revealed as carboxylic and sulfonic acids and sulfonate by Fourier transform infrared analysis. A total of nine error functions were applied to validate the models. We strongly suggest the analysis of error functions for validating adsorption isotherm and kinetic models using linear methods. The present work shows that the red seaweedKappaphycussp. can be used as a potentially low-cost biosorbent for the removal of heavy metal ions from aqueous solutions. Further study is warranted to evaluate its feasibility for the removal of heavy metals from the real environment.

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Preparation and application of Fe3O4@Acetamidoxanthate as a unique nanosorbent in heavy metal removing

Main Group Chemistry ◽

10.3233/mgc-210073 ◽

2021 ◽

pp. 1-11

Author(s):

Mohammad Moein Mohareri ◽

Mehdi Ghaffari ◽

Elham Sattarzadeh ◽

Saeed Kakaei

Keyword(s):

Heavy Metals ◽

Chelating Agents ◽

High Efficiency ◽

Fourier Transforms ◽

Metal Extraction ◽

Removal Of Heavy Metals ◽

Ft Ir ◽

Temperature Time ◽

Widespread Interest ◽

Nano Adsorbent

Chelating agents are one of the most important substances in metal extraction, but separation is the main problem in the use of these agents as an adsorbent. After the adsorption of metals by an external magnet, magnetic NPs provide the possibility of easy collecting and isolating the adsorbent nanomaterial for many applications. Given the immense importance of magnetic NPs, there has been widespread interest in accessing the above adsorbent. In the present study, an attempt was made to synthesize acetamido xanthate which was coupled to NPs and has the potential to be used as a nano-adsorbent for the removal of heavy metals. This novel nano sorbent was characterized by scanning electron microscopy (SEM), Fourier transforms infrared (FT-IR), and Nuclear Magnetic Resonance (NMR) spectroscopy. The effect of some parameters such as temperature, time, pH, and the amount of adsorbent on the extraction reaction was investigated. The optimized condition for extraction of cerium was temperature of 30°C, pH = 8, reaction time of 45 minutes using 7.5 mg of the prepared nanosorbent, that in such condition the yield of reaction achieved up to 97%. The prepared adsorbent showed high efficiency in the adsorption of heavy metals specifically.

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Use of Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans in the Recovery of Heavy Metals from Landfill Leachates

Energies ◽

10.3390/en14113336 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3336

Author(s):

Tomasz Kamizela ◽

Anna Grobelak ◽

Malgorzata Worwag

Keyword(s):

Heavy Metals ◽

Mixed Culture ◽

Reverse Osmosis ◽

Landfill Leachate ◽

Acidithiobacillus Ferrooxidans ◽

High Efficiency ◽

Metal Removal ◽

Acidithiobacillus Thiooxidans ◽

Landfill Leachates ◽

Removal Of Heavy Metals

Among the methods used to remove metals and their compounds from landfill leachates with low application costs and high efficiency are bioleaching and biosorption. The most effective bacteria used in the metal removal process are Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. The aim of the study was to determine the usefulness of the A. ferrooxidans and A. thiooxidans population in removing heavy metals from landfill leachate. In addition, development opportunities for bacterial population using landfill leachate as growth medium were identified. The substrate for the research was the raw leachate before the reverse osmosis process. In order to increase the efficiency of trace elements removal and recovery from leachate, variable combinations have been used which differ by the addition of sulfuric acid, A. ferrooxidans culture, A. thiooxidans culture, mixed culture containing populations of both bacteria, and elemental sulfur. Based on the research, it was found that the removal of heavy metals from leachate was a selective process. High bioleaching efficiency, from 80% to 90%, was obtained for all metals for which the sample acidification or sulfur addition was used. The simultaneous combination of both these additives turned out to be the most advantageous. The A. thiooxidans culture was the most effective in bioleaching reverse osmosis effluents. For the A. ferrooxidans culture used, much lower efficiencies were obtained, while by contrast, the use of mixed culture of two bacterium species had no significant effect.

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Kinetic study on the removal of heavy metals by Cajanus Cajan husk

WEENTECH Proceedings in Energy ◽

10.32438/wpe.6019 ◽

2019 ◽

pp. 206-229

Author(s):

Mallappa A. Mallappa A. Devania, Mallappa A. Devania ◽

Basudeb Munshi

Keyword(s):

Heavy Metals ◽

Kinetic Model ◽

Kinetic Models ◽

Cajanus Cajan ◽

Second Order ◽

Order Model ◽

First Order ◽

Removal Of Heavy Metals ◽

Pseudo Second Order ◽

Pseudo First Order

The removal of heavy metals from wastewater has become crucial to meet safe discharge standards. Development of more economic process has been strived owing to high cost of adsorbents. Thus, biosorption process has become the area of interest to researchers and engineers. The present study has carried out the transient removal of heavy metals from wastewater by both physically treated and chemically modified Cajanus cajan (Pigeon pea) husk (CCH) as novel biosorbents. Work includes five different models such as first order, second order, nth order, first order reversible and second order reversible under the heading of prediction of transient concentration of metal in the solution are used, and under the heading of prediction of transient metal uptake capacity; fractional power, pseudo first order, pseudo second order, second order reversible, Elovich, intra-particle diffusion and film diffusion models are used to analyse the kinetic data. For a metal at any particular initial concentration the best kinetic model with the least RMSE is identified. Pictorial comparison between experimental and pseudo second order and pseudo first order model predictive data of Cd(II) and Cu(II) transient biosorption, respectively onto CCH are illustrated. The trend of the results shows a successful prediction capability of all the kinetic models used in the present work. According to RMSE data, it can be concluded that the best kinetic models are pseudo second order for Cd(II) and pseudo first order for Cu(II). It has been found that the required equilibrium time is always less for the chemically activated than the physically activated sorbent. At 100 mg/L initial metal concentration, pseudo-first-order model has been identified as the best kinetic model for the transient Cu(II) and the best kinetic model for fitting the transient sorption of Cd(II) on CCH is pseudo-second-order. At initial metal concentration of 150 mg/L, initial biosorption rate of 9.7038 for Cd(II) on CCH(N) is greater than 1.4553 for Cu(II) on CCH(N). These indicate that Cd(II) undergoes faster adsorption rate than Cu(II) onto CCH.

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