Adsorption of Methylene Blue by Rice Hull Ash

Chen, Xuegang; Lv, Shuang-Shuang; Liu, Su-Ting; Zhang, Pingping; Zhang, Aobo; Sun, Jie; Ye, Ying

doi:10.1080/01496395.2011.606865

Cited by 69 publications

(24 citation statements)

References 53 publications

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“…The dimensionless separation factor/equilibrium parameter ( R L ), an essential characteristic of Langmuir isotherm, was calculated as :

R_{normalL} = \frac{1}{(1 + k C_{normali})}

where, k (L mg −1 ) is the Langmuir bonding energy coefficient and C i is the highest initial dye concentration (mg L −1 ). The value of R L indicates the feasibility of dye adsorption.…”

Section: Methodsmentioning

confidence: 99%

Crop Residue Ashes as Adsorbents for Basic Dye (Methylene Blue) Removal: Adsorption Kinetics and Dynamics

Ghosh

Reddy

2013

CLEAN Soil Air Water

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In the quest for identifying low‐cost, locally available and effective adsorbents, pigeon pea (Cajanus cajan L.) residue ash (PRA) and sunflower (Helianthus annuus L.) residue ash (SRA) were evaluated as adsorbents for sequestering a basic dye, methylene blue (MB), from aqueous solution. Effects of contact time, initial solution pH and adsorbent dose on MB adsorption were investigated. MB adsorption onto PRA and SRA was dependent on initial solution pH, with adsorption being greater at higher pH. Percent MB removal increased with increase in adsorbent's dose. Adsorption followed pseudo‐second order kinetics. Intraparticle diffusion was not the sole rate‐controlling step. Both film diffusion and intraparticle diffusion controlled the adsorption process. The equilibrium data fitted well to Langmuir isotherm as compared to Freundlich isotherm, on the basis of coefficient of determination and error analysis. The maximum MB adsorption capacities of PRA and SRA were found as 58.8 and 62.5 mg g−1, respectively. The free energy change and dimensionless equilibrium parameter revealed spontaneous and favorable nature of MB adsorption onto crop residue ashes. Results demonstrate that the PRA and SRA have high adsorptive potential as compared to many previously reported ash based adsorbents, and hence can be used for treating water contaminated with cationic dyes.

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“…The dimensionless separation factor/equilibrium parameter ( R L ), an essential characteristic of Langmuir isotherm, was calculated as :

R_{normalL} = \frac{1}{(1 + k C_{normali})}

where, k (L mg −1 ) is the Langmuir bonding energy coefficient and C i is the highest initial dye concentration (mg L −1 ). The value of R L indicates the feasibility of dye adsorption.…”

Section: Methodsmentioning

confidence: 99%

Crop Residue Ashes as Adsorbents for Basic Dye (Methylene Blue) Removal: Adsorption Kinetics and Dynamics

Ghosh

Reddy

2013

CLEAN Soil Air Water

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“…There are four two-parameter equations-Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich isotherms and three three-parameter equations-Redlich-Peterson, Toth, and Sips isotherms, which can be used to describe equilibrium adsorption data (Ho et al, 2002). Among them, the Freundlich and Langmuir isotherms are the most favorable and most frequently used (Chen et al, 2012). So Freundlich and Langmuir models were selected to explicate CR-SSP interaction in this study.…”

Section: Adsorption Theorymentioning

confidence: 99%

Adsorption of Congo red from aqueous solution onto shrimp shell powder

Zhou

Fan

et al. 2018

Adsorption Science & Technology

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Two novel adsorbents derived from shrimp shell were prepared and their adsorption performances on Congo red were investigated. The results suggested that treated shrimp shell powder exhibited a higher adsorption capacity than raw shrimp shell powder. The factors of initial concentration, solution pH, adsorption time, and temperature were investigated. The maximum adsorption capacity of treated shrimp shell powder calculated according to the Langmuir isotherm model was 288.2 mg/g, which is much higher than that of chitin. The adsorption behavior could be fitted well by the pseudo-second-order kinetic model. Intra-particle diffusion model was also used to study the adsorption process. The thermodynamic parameters indicated the spontaneous and endothermic nature of the adsorption. Shrimp shell powder exhibited enough advantages such as large adsorption capacity, low cost, simple processing methods and high specific gravity compared with chitin or chitosan. This work confirmed that the shrimp shell biosorbent had a potential to be applied in dye wastewater treatment area.

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“…In addition, the ferrite nanoparticles will fill up the existing micropores, the BET surface area and micropore volume of RHC are significantly lower than that of RHA as a result. Because MB molecules can only enter mesopores [32], the mesopore volume is a key factor in determining the MB adsorption capacity of adsorbents.…”

Section: Characterization Of Samplesmentioning

confidence: 99%

“…In our previous work, we have studied the thermal destruction of rice husk in air and nitrogen and the adsorption properties of rice husk ash (RHA) [32,33]. The rice husk/ferrite composites were synthesized and characterized.…”

Section: Introductionmentioning

confidence: 99%

Fixed-bed adsorption of methylene blue by rice husk ash and rice husk/CoFe2O4 nanocomposite

Yan

Ji-ao

Chen

et al. 2016

Desalination and Water Treatment

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2015): Fixed-bed adsorption of methylene blue by rice husk ash and rice husk/CoFe 2 O 4 nanocomposite, Desalination and Water Treatment, A B S T R A C TRice husk ash (RHA) is a promising low-cost adsorbent. Meanwhile, the magnetic and catalytic capabilities of ferrite nanoparticles make it efficient for water purification. In this study, we prepared RHA and rice husk/CoFe 2 O 4 composite (RHC) and studied their methylene blue (MB) adsorption capacities in fixed-bed columns. The column regeneration was also investigated. Both RHA and RHC are amorphous materials with Brunauer, Emmet and Teller (BET) surface area of >180 m 2 g −1 and mesopore volume of >0.1 cm 3 g −1 . The CoFe 2 O 4 nanoparticles are mainly located on the inner surface of RHC, which significantly increased the mesopore volume and average pore size but decreased the BET surface area and micropore volume. The adsorption ability of RHC was investigated in a fixed-bed column, with RHA as control. The effects of column parameters including bed height, flow rate, and inlet MB concentration on breakthrough curves were studied. The mathematical models, such as bed-depth service time (BDST), Thomas, and Yoon-Nelson models were applied to predict the breakthrough curves. It was found that BDST model fitted the breakthrough curves best. Results showed that the breakthrough time of RHC is more than two times than that of RHA, which may be attributed to the catalytic performance of CoFe 2 O 4 nanoparticles. The exhausted RHA and RHC were retreated by three methods and eluted of the column with ethanol caused the highest regeneration efficiency. In addition, fixed-bed tests of RHA and RHC on real dye wastewater demonstrated that these adsorbents have good practical value and application prospect.

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Adsorption of Methylene Blue by Rice Hull Ash

Cited by 69 publications

References 53 publications

Crop Residue Ashes as Adsorbents for Basic Dye (Methylene Blue) Removal: Adsorption Kinetics and Dynamics

Crop Residue Ashes as Adsorbents for Basic Dye (Methylene Blue) Removal: Adsorption Kinetics and Dynamics

Adsorption of Congo red from aqueous solution onto shrimp shell powder

Fixed-bed adsorption of methylene blue by rice husk ash and rice husk/CoFe2O4 nanocomposite

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