Adsorption performance and mechanism of methylene blue by H3PO4- modified corn stalks

Tang, Yufang; Zhao, Yuemei; Lin, Tianpei; Li, Yuqin; Zhou, Rong; Peng, Yongzhen

doi:10.1016/j.jece.2019.103398

Cited by 48 publications

(22 citation statements)

References 43 publications

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“…The adsorption of MB by AC can be explained in terms of three major mechanisms: (i) electron-donor mechanism (ii) π-π interaction, and (iii) effect of solvent. An electron-donor mechanism is based on sharing of electrons which occurs between the MSAC (adsorbent) and MB (adsorbate), the aromatic ring of MB acts as an electron acceptor and the surface functional groups present on MSAC acting as donor 29 ; π-π interaction, occurs due to the charge transfer happening between the π electrons of the benzene ring and the MSAC surface. The third mechanism namely effect of solvent means that the adsorbed water molecules have quite a high possibility of being attracted to the surface -O-groups, thus O n L i n e F i r s t leading to the formation of H-bonds between them.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Activated carbon from mustard stalk biomass: Synthesis, characterization and application in wastewater treatment

Patidar

Vashishtha

2021

JSCS

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Present work is focused on the preparation of mustard stalk activated carbon (MSAC) using chemical activation with H3PO4 and exploring its properties for its use in dye removal from wastewater. Adsorption variable (dosage, contact time, and solution pH), pore structure, morphology, surface functional groups, equilibrium kinetics, and isotherm study for removal of methylene blue (MB) using MSAC were investigated. The present study showed that an adsorption dosage of 0.2 g L-1 and pH 8 can be considered as optimum for the MB removal. SEM result showed that pore of MSAC was larger than the pore of the mustard stalk (MS). BET surface area and total pore volume of MSAC were found as 510 m2 g-1 and 0.33 cm3 g-1, respectively. Equilibrium adsorption data were examined by Langmuir and Freundlich isotherm models. Better correspondence to the Langmuir model with a maximum adsorption capacity of 212.76 mg g-1 (MB onto MSAC) was obtained. Dimensionless factor, RL revealed favourable nature of the sorption in the MSAC - MB system. Adsorption rates were found to conform to the pseudo-second-order kinetics with good correlation. These results show that the MSAC could be used as a renewable and economical alternative to commercial AC in the removal of MB dye from wastewater.

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Section: Adsorption Kineticsmentioning

confidence: 99%

Activated carbon from mustard stalk biomass: Synthesis, characterization and application in wastewater treatment

Patidar

Vashishtha

2021

JSCS

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“…7), and D-R (Eqs. 8 to 10) adsorption equations can be expressed as follows (Caliskan et al 2011;Tang et al 2019;Wei et al 2016):…”

Section: Adsorption Isotherm Modelmentioning

confidence: 99%

Preparation of cellulose/diatomite composite material and its adsorption characteristics and kinetics

Zhou

Zhao

Huang

et al. 2020

BioRes

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The optimal preparation conditions for cellulose/diatomite composite adsorbents (CDAs) were determined to be a diatomite concentration of 40 wt%, a holding temperature of 700 °C, and a holding time of 30 min. Meanwhile, the yield of CDAs was 70.6%, and the methylene blue (MB) adsorption value was 191.8 mg/g. The specific surface area, total pore volume, and average pore size of the CDAs were 489 m2/g, 0.372 cm3/g, and 3.04 nm, respectively. It was inferred that the diatomite was cross-linked with the cellulose carbon to form some micropores. Greater MB initial concentrations and pH values improved the adsorption on the CDAs. The MB adsorption behavior of the CDAs was described very well by the pseudo-second-order model. The isotherm models showed relatively high adsorption of MB.

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“…The removal of dyes from wastewater is important in protecting the environment because they usually have a complex aromatic structure that makes them stable to light, heat, and oxidizing agents while being recalcitrant to biodegradation [3]. The synthetic dyes also pose serious threats to human health since they are toxic, teratogenic, mutagenic, and carcinogenic and cause severe damage to the central nervous system, digestive system, and liver of human bodies, even at low concentrations [5].…”

Section: Introductionmentioning

confidence: 99%

Equilibrium, Kinetic, and Thermodynamic Studies of Cationic Dyes Adsorption on Corn Stalks Modified by Citric Acid

Soldatkina

Yanar

2021

Colloids and Interfaces

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The modification of agricultural wastes and their use as low-cost and efficient adsorbents is a prospective pathway that helps diminish waste and decrease environmental problems. In the present research, the natural adsorption capacity of corn stalks (CS) was improved by modification of their surface with citric acid. The adsorption capacity of the modified corn stalks (CS-C) was determined with the help of cationic dyes (methylene blue and malachite green). The equilibrium, kinetics, and thermodynamics of the cationic dyes on CS-C were studied. The Langmuir isotherm model best fitted the data both for methylene blue and malachite green adsorption on CS-C. The adsorption kinetics of the cationic dyes was well described by the pseudo-second order model. Thermodynamic studies revealed that adsorption of the cationic dyes on CS-C was an endothermic process. Negative results of ΔGo (between −31.8 and −26.3 kJ mol−1) indicated that the adsorption process was spontaneous in all the tested temperatures. The present study verified that citric acid-modified corn stalks can be used as a low-cost and effective adsorbent for removal of cationic dyes from aqueous solutions.

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Adsorption performance and mechanism of methylene blue by H3PO4- modified corn stalks

Cited by 48 publications

References 43 publications

Activated carbon from mustard stalk biomass: Synthesis, characterization and application in wastewater treatment

Activated carbon from mustard stalk biomass: Synthesis, characterization and application in wastewater treatment

Preparation of cellulose/diatomite composite material and its adsorption characteristics and kinetics

Equilibrium, Kinetic, and Thermodynamic Studies of Cationic Dyes Adsorption on Corn Stalks Modified by Citric Acid

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