Facile application of OH-ended triazinic dendrimer/halloysite nanotube for removal of methylene blue with a high capacity

Zandi-Mehri, Elham; Taghavi, Lobat; Moeinpour, Farid; Khosravi, Iman; Ghasemi, Saber

doi:10.1080/03067319.2022.2094707

Cited by 4 publications

(2 citation statements)

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“…These parameters were calculated using Equations (12)–(14). [ 50,51 ]

K_{L} goodbreak= \frac{{normalC}_{ad}}{{normalC}_{normale}}

\ln K_{L} goodbreak= goodbreak- \frac{∆ normalH °}{RT} goodbreak+ \frac{∆ normalS °}{R}

∆ normalG ° goodbreak= ∆ normalH ° goodbreak- normalT ∆ normalS °

where K L (mL g −1 ) is the value of the HTMIs distribution coefficient, T is the value of the taken temperature (Kelvin), and R is the gas constant (8.314 in J mol −1 K −1 ).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U⁶⁺, Pb²⁺, Cr⁶⁺, and Cd²⁺ ions from aqueous solutions

Patel

Sutar

Maharana

2022

J Chinese Chemical Soc

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The current research work deals with the synthesis of a novel composite material of carboxylic graphene oxide-carboxymethyl chitosan (COOH-GO-CMC) composite by ultrasound and microwave-assisted processes. The composite was characterized by Fourier Transform Infra-red spectroscopy, X-ray Powder Diffraction, Raman Spectroscopy, Scanning Electron Microscopy, and X-ray Photoelectron Spectroscopy. The synthesized composite was used to remove heavy toxic metal ions (HTMIs) such as uranium (U 6+ ), lead (Pb 2+ ), chromium (Cr 6+ ), and cadmium (Cd 2+ ) ions from aqueous solutions. The HTMIs removal study was carried out to verify the effects of pH, contact time, amount of adsorbent dose, initial concentration, and temperature. The linear and nonlinear Langmuir and Freundlich adsorption isotherms were fitted to the data of removal studies, and it was observed that the linear Langmuir adsorption isotherm (R 2 > 0.99) was the best-fitted model. The maximum adsorption capacities of COOH-GO-CMC were found to be 74. 62, 416.66, 76.92, and 53.47 mg g À1 for U 6+ , Pb 2+ , Cr 6+ , and Cd 2+ ions, respectively. The kinetics studies, including four types of models (linear and nonlinear pseudo-firstorder, linear and nonlinear pseudo-second-order, Intraparticle diffusion, and Elovich kinetic models), were tested, and the results showed that the linear pseudo-second-order kinetics model (R 2 > 0.99) was the best-fitted model. The thermodynamic studies reveal that the adsorption of HTMIs is a spontaneous (ΔG < 0) and exothermic (ΔH < 0 and ΔS > 0) process in nature.adsorption isotherm, carboxymethyl chitosan, graphene oxide, heavy metal ion removal | INTRODUCTIONAny metallic element with a comparatively high density that is toxic or poisonous even at low concentrations is referred to as "heavy metal." Heavy metals are defined as metals with an atomic number greater than 20 and an atomic density greater than 4 g cm À3 , or 5 times the density of water. [1] As a result of rapid industrialization, hazardous contaminants are discharged in large quantities into different water bodies. As these contaminants are non-degradable, toxic, cancer-causing agents, and difficult to remove from water, heavy toxic metal ions

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“…These parameters were calculated using Equations (12)–(14). [ 50,51 ]

K_{L} goodbreak= \frac{{normalC}_{ad}}{{normalC}_{normale}}

\ln K_{L} goodbreak= goodbreak- \frac{∆ normalH °}{RT} goodbreak+ \frac{∆ normalS °}{R}

∆ normalG ° goodbreak= ∆ normalH ° goodbreak- normalT ∆ normalS °

where K L (mL g −1 ) is the value of the HTMIs distribution coefficient, T is the value of the taken temperature (Kelvin), and R is the gas constant (8.314 in J mol −1 K −1 ).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U⁶⁺, Pb²⁺, Cr⁶⁺, and Cd²⁺ ions from aqueous solutions

Patel

Sutar

Maharana

2022

J Chinese Chemical Soc

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“…Thus, different technologies such as adsorption, filtration, precipitation, ion exchanges, flocculation, coagulation, and ozonation were applied. Adsorption is a highly remarkable method that is used in dye removal due to its simplicity, low costs, and excellent efficiency [ 5 , 6 , 7 , 8 ]. Materials such as clays, zeolites, activated carbon, carbon nanomaterials, polymers, biomass, and agricultural wastes were commonly investigated as adsorbent candidates.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen-Rich Polyaniline-Based Activated Carbon for Water Treatment: Adsorption Kinetics of Anionic Dye Methyl Orange

2023

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In the present work, a nitrogen-rich activated carbon (PAnAC) was prepared using polyaniline (PAn) as a precursor to represent one possible conversion of nitrogen-containing polymeric waste into a valuable adsorbent. PAnAC was fabricated under the chemical activation of KOH and a PAn precursor (in a 4:1 ratio) at 650 °C and was characterized using FTIR, SEM, BET, TGA, and CHN elemental composition. The structural characteristics support its applicability as an adsorbent material. The adsorption performance was assessed in terms of adsorption kinetics for contact time (0–180 min), methyl orange (MO) concentration (C0 = 50, 100, and 200 ppm), and adsorbent dosages (20, 40, and 80 mg per 250 mL batch). The kinetic results revealed a better fit to a pseudo-second-order, specifically nonlinear equation compared to pseudo-first-order and Elovich equations, which suggests multilayer coverage and a chemical sorption process. The adsorption capacity (qe) was optimal (405.6 mg/g) at MO C0 with PAnAC dosages of 200 ppm and 40 mg and increased as MO C0 increased but decreased as the adsorbent dosage increased. The adsorption mechanism assumes that chemisorption and the rate-controlling step are governed by mass transfer and intraparticle diffusion processes.

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Three novel Co(ii)-based MOFs: syntheses, structural diversity, and adsorption properties

et al. 2022

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Facile application of OH-ended triazinic dendrimer/halloysite nanotube for removal of methylene blue with a high capacity

Cited by 4 publications

References 62 publications

Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U⁶⁺, Pb²⁺, Cr⁶⁺, and Cd²⁺ ions from aqueous solutions

Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U⁶⁺, Pb²⁺, Cr⁶⁺, and Cd²⁺ ions from aqueous solutions

Nitrogen-Rich Polyaniline-Based Activated Carbon for Water Treatment: Adsorption Kinetics of Anionic Dye Methyl Orange

Three novel Co(ii)-based MOFs: syntheses, structural diversity, and adsorption properties

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Facile application of OH-ended triazinic dendrimer/halloysite nanotube for removal of methylene blue with a high capacity

Cited by 4 publications

References 62 publications

Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U6+, Pb2+, Cr6+, and Cd2+ ions from aqueous solutions

Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U6+, Pb2+, Cr6+, and Cd2+ ions from aqueous solutions

Nitrogen-Rich Polyaniline-Based Activated Carbon for Water Treatment: Adsorption Kinetics of Anionic Dye Methyl Orange

Three novel Co(ii)-based MOFs: syntheses, structural diversity, and adsorption properties

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Product

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Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U⁶⁺, Pb²⁺, Cr⁶⁺, and Cd²⁺ ions from aqueous solutions

Synthesis of carboxylic graphene oxide‐carboxymethyl chitosan composite and its applications toward the remediation of U⁶⁺, Pb²⁺, Cr⁶⁺, and Cd²⁺ ions from aqueous solutions