Desorption of Methylene blue dye from brown macroalga: Effects of operating parameters, isotherm study and kinetic modeling

Daneshvar, Ehsan; Vazirzadeh, Arya; Niazi‎, Ali; Kousha, Masoud; Naushad, Mu.; Bhatnagar, Amit

doi:10.1016/j.jclepro.2017.03.119

Cited by 360 publications

(113 citation statements)

References 39 publications

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“…The composites pNACs were synthesized by in situ reduction of AgNO 3 solution by NaBH 4 . The FTIR spectra shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In summary, pNACs composite systems with thermo-responsive pNA template embedded with Ag nanoparticles were prepared successfully by in situ chemical reduction of AgNO 3 by NaBH 4 . The amount of Ag nanoparticles was controlled by using different amounts of AgNO 3 solution.…”

Section: Resultsmentioning

confidence: 99%

“…The thermo-responsive behavior of pNA and pNACs was checked by DLS and UV-visible spectroscopy, respectively. The synthesized composite materials were checked for their catalytic performance in the reduction of MB by NaBH 4 . Considering their catalytic activity and reusability, it was found that pNACs have potential application in catalysis and can be used in other reduction processes.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the colored form of MB cannot be biodegraded more easily as compared to its reduced colorless form. Several methods have been designed for the removal of MB and other organic pollutants from waste water such as adsorption desorption strategy [3][4][5][6], c-irradiation [7], ozonation [8][9][10], photocatalysis [11][12][13], ion exchange [14], membrane separation [2], reverse or forward osmosis [15], electrochemical methods [16,17], biochemical materials [18][19][20], but all these methods are either very expensive or cannot remove the pollutants completely. Chemical reduction method used to convert these dyes from toxic state to nontoxic or less toxic form is very easy and environmentally friendly, but the reduction of these dyes without catalyst takes much time.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Shah

Sayed

Fayaz

et al. 2017

Nanotechnol. Environ. Eng.

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In this work, we report the synthesis of composite system pNAC, composed of silver nanoparticles embedded in pure thermo-sensitive crosslinked polymer network of poly(N-isopropylacrylamide-co-acrylamide) (pNA), using as a catalyst for the reduction of methylene blue (MB) dye by sodium borohydride (NaBH 4 ). The pNA was prepared by conventional free radical polymerization technique using sodium dodecyl sulfate as stabilizing agent, followed by in situ reduction of AgNO 3 inside the polymer network by NaBH 4 for the synthesis of composite systems pNACs. The synthesized pNA and pNACs were characterized by FTIR, dynamic light scattering, thermogravimetric analysis, scanning electron microscopy and UV-visible spectroscopy techniques. The materials were found sensitive toward temperature change of the medium. The entrapment ability of pNA toward different amounts of AgNO 3 solution was studied, and effect of metal content on particle size of pNACs was analyzed. The pNACs were applied as a catalyst for the reduction of MB in which they exhibit high catalytic activity and reusability toward the reaction.

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“…The composites pNACs were synthesized by in situ reduction of AgNO 3 solution by NaBH 4 . The FTIR spectra shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Shah

Sayed

Fayaz

et al. 2017

Nanotechnol. Environ. Eng.

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show abstract

“…Lower index values show increased difficulty of the sorbed analyte to be desorbed from the adsorbent (Lima et al, 2010;Hedia and Al-Aswad 2016). Observed desorption data has been fitted to first-order kinetic model as: S t /S o = e -k 1 t where S o is the amount initially adsorbed (g kg -1 ), S t is the amount desorbed at different times (g kg -1 ), and k 1 is the rate constant for the first order reaction (h -1 ) (Daneshvar et al 2017). …”

Section: Discussionmentioning

confidence: 99%

Sorption and Desorption of Atrazine on Natural Bentonite and Organically Modified Bentonite

2017

Alexandria Science Exchange Journal: An International Quarterly

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In order to increase the effectiveness of bentonite clay in the retention of atrazine, natural bentonite clay was modified using humic acid and hexadecyltrimethylammonium bromide (HDTMA) as the intercalation agent and a cationic surfactant at 100 % of the cation exchange capacity. Such organic modification changes the nature of clay from hydrophilic to hydrophobic, which insures surfactant loading. The performance of the natural and modified bentonite was evaluated in terms of elemental analysis, BET surface area, X-ray diffraction (XRD), FTIR spectroscopy, and thermogravimetric analysis ( . Natural bentonite and humic-bentonite clearly exhibited nonsingularity of sorption/desorption isotherms. The desorption curve of HDTMA-bentonite revealed that the sorption of atrazine is reversible with no hysteresis. These results indicate the potentiality of HDTMA-bentonite for environmental applications.

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Radiation‐initiated chitosan‐based double network hydrogel: Synthesis, characterization, and adsorption of methylene blue

Fan

et al. 2021

J of Applied Polymer Sci

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A novel chitosan (CTS)‐based double network Poly(2‐acrylaMido‐2‐Methyl‐1‐propanesulfonic acid)/Polyacrylamide/CTS hydrogel was synthesized by irradiation initiated. Laponite RD (RD) was used as both dopant and the cross‐linking agent. Then the fabricated hydrogel was applied as an efficient adsorbent to remove the methylene blue (MB) in an aqueous solution. This hydrogel has both high strength and good adsorption properties for MB. The results from Brunauer–Emmett–Teller method confirmed that the hydrogel has a large specific surface area (96 m2/g) and developed pore structure, which is available for the contact between the adsorbent and dye molecules. In the adsorption process, the RD provides plenty of negative charges as adsorption sites for MB molecules. The influence of pH, temperature, and adsorbent dose on the adsorption performance was investigated in detail. The experimental data fit well with the pseudo‐second‐order kinetic model and Langmuir isotherm. Besides, the mechanical strength of the hydrogel was also investigated in this work.

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Desorption of Methylene blue dye from brown macroalga: Effects of operating parameters, isotherm study and kinetic modeling

Cited by 360 publications

References 39 publications

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Sorption and Desorption of Atrazine on Natural Bentonite and Organically Modified Bentonite

Radiation‐initiated chitosan‐based double network hydrogel: Synthesis, characterization, and adsorption of methylene blue

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