The optimization study of direct red 81 and methylene blue adsorption on NaOH-modified rice husk

Ashrafi, Seyed Davoud; Kamani, Hossein; Mahvi, A H

doi:10.1080/19443994.2014.979329

Cited by 53 publications

(31 citation statements)

References 39 publications

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“…It will also influence the changes in crystallinity, pore architecture, accessibility, stiffness, unit cell structure and orientation of fibrils cellulosic fibres. NaOH treatment also eliminates the impurities such as natural fats, waxes and other low molecular weight compounds from the biomass and reveals the active functional groups which are easily accessible for pollutant adsorption [31,32]. NaOH also improves the mechanical and chemical properties such as reactivity, durability and ion exchange capacity of natural material [33].…”

Section: Introductionmentioning

confidence: 99%

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Murthy

Gowrishankar

2020

SN Appl. Sci.

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Coffee husk (CH) was physically and chemically treated with autoclaving (SCH) and NaOH (NCH) to develop low-cost adsorbent for the removal of methylene blue (MB) from synthetic wastewater, and their adsorption efficiencies were evaluated in batch mode. The prepared adsorbent was characterised by SEM, FTIR and point of zero charge. The central composite rotatable design (CCRD) was employed to optimise the adsorption process parameters such as pH, adsorbent dosage and initial MB concentration. The second-order quadratic model fitted best with the experimental adsorption data, and ANOVA results showed that the developed model was significant. The linear terms in the model significantly influence the adsorption capacity of SCH and NCH, but interaction terms were not significant. At optimised conditions, the developed adsorbents can remove > 90% of MB from the aqueous solution. Freundlich model showed a better fit with the adsorption isotherm data with R 2 greater than 0.95. Kinetics of MB adsorption onto SCH and NCH followed the pseudo-second-order model. The maximum monolayer adsorption capacity was found to be 129 and 200 mg/g for SCH and NCH, respectively. The present study showed that pretreated coffee husk waste can be used as an alternative for expensive adsorbents for the removal of dyes from wastewater.

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Section: Introductionmentioning

confidence: 99%

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Murthy

Gowrishankar

2020

SN Appl. Sci.

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“…To investigate the effects of various variables simultaneously, the use of an appropriate design of experiment (DOE) method is required. One of the useful methods for design of experiments, statistical modeling and process optimization is response surface methodology (RSM) [15,16].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metals Removal from Aqueous Solution by Modified Natural Zeolites Using Central Composite Design

Rahimi

Mahmoudi

2019

Period. Polytech. Chem. Eng.

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Removal of heavy metals including Pb, Co, Cr and Zn from an aqueous solution was investigated using modified clinoptilolite zeolites as adsorbents. The adsorbents were characterized by X-ray, FTIR, SEM and BET. The central composite design defined under response surface methodology was applied for design of experiments. According to the results, clinoptilolite/MgO showed higher capacity for absorption of lead (98.38 %) in comparison to clinoptilolite/NaOH. The removal percentage of Co, Cr and Zn was obtained 89.51 %, 81.07 % and 78.24 %, respectively, using clinoptilolite/MgO. Moreover, the equilibrium experimental data well fitted the Freundlich isotherm model, as compared with the Langmuir isotherm. The results show that the complete regeneration of adsorbents can be achieved at room temperature using NaCl (0.35 M).

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“…(2015) [1][2][3][4][5][6][7][8][9] www.deswater.com doi: 10.1080/19443994.2015.1060903 chemical and photochemical degradation, and enzymatic treatment [4−9]. Among these methods, adsorption is proved to be an effective and costeffective method for many contaminant removals from aqueous solution, especially dye removal [7−18].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…The adsorbent rice husk used in the present experiments was prepared by alkali treatment using the [5]. Briefly, the natural rice husk (NRH) was screened and passed through 2 mm sieve size, followed by washing repeatedly by distilled water.…”

Section: Preparation Of Adsorbentmentioning

confidence: 99%

Optimization and modeling of process variables for adsorption of Basic Blue 41 on NaOH-modified rice husk using response surface methodology

Ashrafi

Kamani

Arezomand

et al. 2015

Desalination and Water Treatment

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A B S T R A C TThe aim of this study was to optimize the conditions of the Basic Blue 41 (BB41) adsorption on NaOH-modified rice husk (NaOH-RH) using response surface methodology based on Box-Behnken design. The three-level factors considered were pH (4, 7, and 10), initial concentration of BB41 (50, 75, and 100 mg L −1 ), and adsorbent dose (0.025, 0.0875, and 0.15 g L −1 ). Statistical analysis of result has shown that the predicted values for BB41 adsorption were close to the experimental values and were in a good agreement, on the other hand, the F-value (40.48), p-value (0.0004), and R 2 (0.9865) indicated that the regression is able to give a good prediction of response for the adsorption process in the range studied. According to the results, when the response was set in maximize and all the three factors were set in a range, the optimized values for BB41 adsorption were predicted as follows: pH value of 8.47, and BB41 initial concentration of 67.9 mg L −1 and adsorbent dose of 0.12 g L −1 for removal efficiency of 97.65%.

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The optimization study of direct red 81 and methylene blue adsorption on NaOH-modified rice husk

Cited by 53 publications

References 39 publications

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Heavy Metals Removal from Aqueous Solution by Modified Natural Zeolites Using Central Composite Design

Optimization and modeling of process variables for adsorption of Basic Blue 41 on NaOH-modified rice husk using response surface methodology

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