Carbon nanotube-based magnetic and non-magnetic adsorbents for the high-efficiency removal of diquat dibromide herbicide from water: OMWCNT, OMWCNT-Fe3O4 and OMWCNT-κ-carrageenan-Fe3O4 nanocomposites

Duman, Osman; Özcan, Ceren; Polat, Tülin Gürkan; Tunç, Sibel

doi:10.1016/j.envpol.2018.10.071

Cited by 204 publications

(61 citation statements)

References 44 publications

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“…It can be found in the literature that the adsorption equilibrium of cationic dyes-such as methylene blue-follows the Langmuir isotherm [16,18,25,31,34,36]. Similar results were reported for the adsorption isotherms of various pollutants onto different adsorbent types [21,37]. At significantly elevated temperature of 60-65 • C using the microcline fraction containing smaller particles than 71 µm, the methylene blue adsorption closely linearly increased up to the 3.96 mg g −1 specific adsorbed amount at 22 mg L −1 equilibrated concentration, then it linearly decreased up to 98 mg L −1 equilibrated concentration, where the adsorbed amount is 0.49 mg g −1 .…”

Section: Discussionsupporting

confidence: 75%

Methylene Blue Adsorption Study on Microcline Particles in the Function of Particle Size Range and Temperature

2019

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In this paper, the adsorption process of methylene blue has been investigated on microcline particles as a function of particle size and temperature. The characterization of microcline in the particle size ranges of 1−71 μm and 71−315 μm gained by sieving was proved using X-ray diffraction (XRD) and scanning electron microscopy combined with energy-dispersive detector (SEM-EDS) in powder form, over laser diffraction measurements in aqueous suspension. The optimum dosage of adsorbent was 13.5 g/L in dye adsorption and the adsorption isotherms on both microcline size fractions were determined at this adsorbent concentration. The maximum adsorption capacities were in the range of 1.5–3.1 mg g−1 on microcline particles with supplementing evaluation of isotherms using the Langmuir model. Considering the problems of linearization of equations, the non-linear least-squares estimation can be strongly recommended for modeling adsorption-equilibrium. The adsorption isotherm determined at elevated temperature of 60−65 °C represents a breakpoint at around 20 mg L−1 of equilibrated dye concentration due to performing of a potential process of dye self-association. According to our experiments, the increase in temperature has an adverse effect on adsorption.

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Section: Discussionsupporting

confidence: 75%

Methylene Blue Adsorption Study on Microcline Particles in the Function of Particle Size Range and Temperature

2019

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“…The main factor responsible for high adsorption was π‐electron density, specific surface area and pore volume of CNTs. The thermodynamic study indicated that the adsorption process in all cases was spontaneous and endothermic in nature . These studies showed that adsorption depends on structure and properties of both adsorbate as well as the adsorbent.…”

Section: Removal Of Organic Contaminants Using Nanomaterialsmentioning

confidence: 97%

Recent Progress in Nanomaterials for Adsorptive Removal of Organic Contaminants from Wastewater

2020

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Water being most vital component of life is getting contaminated due to inhuman disposal of toxicants in water bodies. Organic compounds such as dyes, pharmaceuticals/drugs, pesticides etc. are used for various purposes and become life threatening when dumped in water bodies without pre‐treatment. Removal of these toxicants from environment is complicated but highly essential for sustainable development. Various methods have been used for this purpose among which adsorption is the most simple, fast, effective and inexpensive method for the removal of such contaminants. Nanomaterial proved to be one of the best adsorbent due to its unique structural properties which provides large surface area and high adsorption capacity. The factors affecting adsorption along with adsorption mechanism is discussed in detail. Detection of the pollutants is also quite tedious work as pollutants are present in trace quantity. UV‐Visible spectrophotometry is widely used detection technique which is easy to operate, produce accurate results and cheap. The review emphasizes the use of nanomaterial as adsorbents for the removal of various organic pollutants from wastewater using UV‐Visible spectrophotometry.

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“…Iron oxide nanoparticles (NPs) have low removal efficiency when used as adsorbents for water pollutants due to their agglomeration. It was previously reported that diquat herbicide is not adsorbed by Fe 3 O 4 NPs . Hence additional magnetite surface treatments are required to increase the sorption of pollutants on adsorbents by embedding the iron oxide into polymer matrices using the in situ technique to control their magnetic properties so they can be easily magnetically separated after the water treatment …”

Section: Introductionmentioning

confidence: 99%

Preparation of magnetite and silver poly(2‐acrylamido‐2‐methyl propane sulfonic acid‐co‐acrylamide) nanocomposites for adsorption and catalytic degradation of methylene blue water pollutant

Atta

Gafer

Al‐Lohedan

et al. 2019

Polymer International

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The aim of the present work was to prepare microgel nanocomposites based on silver and magnetite to apply as adsorbents and heterogeneous catalysts for removal of methylene blue (MB) cationic dye from aqueous solution. For this, 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and acrylamide (AAm) monomers were used to prepare AMPS/AAm microgel based on the emulsion technique. Ag and Fe 3 O 4 nanoparticles were embedded into the AMPS/AAm microgel using the in situ technique. Their particle sizes, surface charges, crystalline lattice structure, morphology, magnetic properties and thermal stability were investigated. The AMPS/AAm hydrogel nanocomposites were used as an adsorbent to remove MB dye. The AMPS/AAm microgel nanocomposites were tested as catalysts to reduce MB and degrade its chemical structure with heterogeneous Fenton oxidation using Ag and Fe 3 O 4 nanocomposites, respectively. This study presents promising data as the prepared materials used as adsorbents and catalysts show competitive features compared with the data presented in the literature.

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Carbon nanotube-based magnetic and non-magnetic adsorbents for the high-efficiency removal of diquat dibromide herbicide from water: OMWCNT, OMWCNT-Fe3O4 and OMWCNT-κ-carrageenan-Fe3O4 nanocomposites

Cited by 204 publications

References 44 publications

Methylene Blue Adsorption Study on Microcline Particles in the Function of Particle Size Range and Temperature

Methylene Blue Adsorption Study on Microcline Particles in the Function of Particle Size Range and Temperature

Recent Progress in Nanomaterials for Adsorptive Removal of Organic Contaminants from Wastewater

Preparation of magnetite and silver poly(2‐acrylamido‐2‐methyl propane sulfonic acid‐co‐acrylamide) nanocomposites for adsorption and catalytic degradation of methylene blue water pollutant

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