Removal Behavior of Methylene Blue from Aqueous Solution by Tea Waste: Kinetics, Isotherms and Mechanism

Liu, Li; Fan, Shisuo; Li, Yang

doi:10.3390/ijerph15071321

Cited by 67 publications

(41 citation statements)

References 62 publications

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“…e effect of pH on the adsorption efficiency and capacity for MB in the range of 3 to 11 were investigated. As can be seen in Figure 7, it is evident that the adsorption efficiency increases rapidly with increasing pH from 3 to 4.7. e adsorption efficiency increases slightly when pH arises from 4.7 to 11.1. is finding is consistent with other reports, in which their studies showed that the acidic condition is unfavorable of the adsorption reaction [24,25]. MB belongs to cationic dye and has positive charged ions in aqueous solution.…”

Section: Effect Of Phsupporting

confidence: 93%

“…e heterogeneity factor (n) can be used to determine the difficulty of adsorption behavior. In general, the adsorption process is easy to occur when n is larger than 2 [25]. As shown in Table 2, the heterogeneity factor (n) ranges from 4.11 to 4.90, which suggests that the adsorption process is easy to occur between wasted tea powder and MB as well as reveals the multiple coverage of MB is favorable.…”

Section: Adsorption Isothermsmentioning

confidence: 94%

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Application of Wasted Oolong Tea as a Biosorbent for the Adsorption of Methylene Blue

Zhang

et al. 2019

Journal of Chemistry

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Tea powder, a biosorbent prepared from wasted oolong tea, was collected as a prospective adsorbent for the adsorption of methylene blue (MB) from aqueous solution. e effect of factors on adsorption efficiency, isotherms, kinetics, and potential mechanism was carried out. Adsorption capacity of MB onto wasted tea powder increased with the MB concentration and contact time, whereas the increase in pH value and ion strength appeared to have a negative effect for the adsorption process. e adsorption efficiency increased rapidly and reached a stable state within 120 min. e optimal tea powder loading weight is suggested to be at 0.1 to 0.2 g, and the highest efficiency of 94.8% is achieved at 333 K. ere were no significant changes in adsorption efficiency when the effect of temperature is considered. e Langmuir isotherm model was found to be the best isotherm models to elucidate the adsorption mechanism in this study. e maximum adsorption capacities calculated at different temperatures by the Langmuir model ranging from 312.5 to 333.3 mg·g −1 were much close to the experimental results. From the kinetic analysis, the pseudo--second-order model was found to be the best model to describe the adsorption behavior. e calculated adsorption capacities at different initial MB concentrations by the pseudo-second-order model ranging from 92.34 to 400 mg·g −1 were well close to the experimental data. e fitting results obtained from the intraparticle diffusion model suggested that the intraparticle diffusion was not the only rate-controlling step and some other mechanisms along with the intraparticle diffusion were probably involved. e intraparticle diffusion of MB molecules into pore structures of wasted tea powder is the ratelimiting step for the adsorption process in this study. e repetitive cycle experiments indicated that the wasted oolong tea powder was efficiently regenerated using NaOH and thus be used for many times.

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Section: Effect Of Phsupporting

confidence: 93%

Section: Adsorption Isothermsmentioning

confidence: 94%

Application of Wasted Oolong Tea as a Biosorbent for the Adsorption of Methylene Blue

Zhang

et al. 2019

Journal of Chemistry

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“…The desorption was low (up to 22.7%) and the reason could be formation of some complexes with large adsorption energy between the adsorbent molecules and adsorbate's surface resulting in less desorption. Similar observations were reported for Cupressus sempervirens cones [29], tea waste [32], palmarosa waste-based alginate bead adsorbent [34], brown macroalga [45], etc. Maximum desorption (22.7%) was achieved with 0.1 M H 2 SO 4 treatment.…”

Section: Adsorbent Desorption Studiessupporting

confidence: 86%

“…The decrease in dye removal capacity on recycling could be due to change in surface structure during regeneration coupled with loss of active sorption sites . Low desorption indicated limited possibility of secondary contamination from disposal of dye loaded adsorbent . Disposal of dye loaded adsorbents is a serious concern .…”

Section: Resultsmentioning

confidence: 99%

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Optimization of process parameters for methylene blue removal by jute stick using response surface methodology

Ghosh

Ray

Debnath

et al. 2019

Env Prog and Sustain Energy

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In this study, jute stick (JS), the underexplored by‐product of jute (Corchorus olitorius) cultivation system, has been used as a novel low‐cost adsorbent to remove methylene blue (MB), a cationic dye, from an aqueous medium. Box–Behnken design matrix and response surface methodology (RSM) have been used to evaluate the effect of four important process factors namely, solution pH (3–11), adsorbent dose (0.5–5 g L−1), initial dye concentration (50–200 mg L−1), and time (60–180 min). JS was characterized by physico‐chemical parameters, pHzpc (zero‐point charge), FTIR for the functional groups and SEM–EDX for surface morphology. The direct and interaction effects of adsorption parameters were studied. The optimum values of pH, dose, initial concentration, and time for maximum % dye removal were 10.27, 5 (g L−1), 200 (mg L−1), and 66.06 min. Regeneration and recycling studies were also carried out. The present study indicated that JS, a bio‐waste of jute cultivation system, can be effectively utilized as an adsorbent to treat MB contaminated aqueous medium/ wastewater before environmental disposal. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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The kinetics of photo‐induced chemical transformation reaction of methylene blue and titanium trichloride in different solvents

Nadeem

Saeed

2018

J Chinese Chemical Soc

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The kinetics of photo-induced chemical transformation reaction of methylene blue (MB) and titanium trichloride (TiCl 3 ) was investigated in water and aqueous ethyl acetate by determining the quantum yield of the reaction using optical spectrometry as the analytical technique. The reaction is pseudo-first order, dependent only on the concentration of titanium trichloride at a fixed concentration of MB. The effect of the solvent on the quantum yield was studied in the acidic range from 4.0 to 7.0. The quantum yield was maximum at acidity (pH/H o ) 5.0, while it decreased on either increase or decrease in acidity (pH/H o ). The quantum yield of the reaction was high in water and decreased in 10% aqueous ethyl acetate. The absence of any reaction intermediate was confirmed by spectral analysis of the partially reacted mixture. A reaction mechanism has been suggested in accordance with the existence of different excited states of MB. The quantum yield increased with increase in temperature. The effect of temperature on the quantum yield of the reaction was used to determine the activation energy (E a ) using Arrhenius relation, and other thermodynamic parameters, such as enthalpy change (ΔH*), free energy change (ΔG*), and entropy change (ΔS*), were also evaluated. K E Y W O R D S ethyl acetate, kinetic, methylene blue, thermodynamic, titanium trichloride 1 | INTRODUCTIONMethylene blue (MB) (C 16 H 18 ClN 3 S) is a polyaromatic, heterocyclic, and cationic dye with a thiazine ring structure. It has good solubility in water and other polar solvents. The structure of MB is shown below.

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Removal Behavior of Methylene Blue from Aqueous Solution by Tea Waste: Kinetics, Isotherms and Mechanism

Cited by 67 publications

References 62 publications

Application of Wasted Oolong Tea as a Biosorbent for the Adsorption of Methylene Blue

Application of Wasted Oolong Tea as a Biosorbent for the Adsorption of Methylene Blue

Optimization of process parameters for methylene blue removal by jute stick using response surface methodology

The kinetics of photo‐induced chemical transformation reaction of methylene blue and titanium trichloride in different solvents

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