Influence of fuel nature on dye adsorption efficiency of solution combustion derived zinc oxide nanoparticles: A comparative study

Murthy, T P Krishna; Gowrishankar, B. S.; Krishna, R. Hari; Chandraprabha, M.N.; Rao, Rameshwar

doi:10.1088/2053-1591/aafe3f

Cited by 22 publications

(11 citation statements)

References 69 publications

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“…for removal of dyes from wastewater [3,6,7]. Among these methods, adsorption has emerged as an effective and economical alternative due to its ease of operation, simplicity of design, insensitivity to toxic substances and complete amputation of pollutants rather than getting degraded to hazardous intermediates [8,9]. The high cost and difficulty in regeneration are still concerned with the use of activated carbon, and it has motivated the research community to develop efficient and cost-effective alternative adsorbents for removal of dyes [5].…”

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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“…where q e,exp,i is experimentally measured and q e,pre,i is model predicted adsorbate solid phase concentration on adsorbent at any observation i. q e,exp,avg is the average of experimentally measured observations. N and p are number of observations and number of model parameters respectively [10,29].…”

Section: Discussionmentioning

confidence: 99%

“…The pH of the dye solution is an important factor which effects the absorbent surface charge and degree of ionization of dye molecules. Charge on the adsorbent surface and degree of ionisation of dye molecules have a significant influence on the adsorption capacity of dyes [29]. The influence of pH on adsorption of CR on to CHCA was studied in the pH range 6-11 using 0.3 g l −1 of CHCA with an initial dye concentration of 100 mg l −1 at 303.15 K for 2 h. Lower pH (<6) conditions were not considered because of the shift in λ max of the dye.…”

Section: Effect Of Phmentioning

confidence: 99%

“…Fuel selection is based on several features such as low decomposition temperature, chelating capability, high solubility, availability and cost [27]. It is evident from the literature that carbohydrates and amines are widely used as fuels in the solution combustion synthesis [28,29]. Presence of biomolecules such as carbohydrates (58%-85%), proteins (8%-11%), polyphenols, tannins etc play an important role as fuel and amine-containing molecules possess good chelating ability and aid in better combustion [30,31].…”

Section: Introductionmentioning

confidence: 99%

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Solution combustion synthesis of calcium aluminate nanocomposite using coffee husk extract as green fuel and its application in adsorptive amputation of anionic dyes

Murthy

Gowrishankar

Chandraprabha

et al. 2020

Mater. Res. Express

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Solution combustion synthesis of calcium aluminate (CaAl 2 O 4 ) nanocomposite using coffee husk extract and its adsorption capacity for removal of Congo red (CR) and Indigo carmine (IC) are reported. Physiochemical properties of adsorbent were studied by PXRD, SEM, TEM and point of zero charge. Batch adsorption studies were conducted to study the effect of adsorbent dosage, pH, contact time, initial dye concentration and temperature on adsorption efficiency of coffee husk derived calcium aluminate nanocomposite (CHCA). Among the isotherms used, Langmuir model explained best the equilibrium data and the maximum monolayer adsorption capacity was found to be 377 and 135 mg/g for CR and IC, respectively. Mass transfer analysis indicated adsorptive removal of dyes was controlled by both external and internal diffusion. Pseudo-first-order model fitted best with experimental kinetic data and adsorption efficiency increased with an increase in the initial bulk concentration of CR and IC. Thermodynamic analysis indicated that adsorption of CR and IC on CHCA is feasible, spontaneous and exothermic in nature. The magnitude of enthalpy and heat of adsorption suggested that the adsorption is physical in nature. The present study explores the potential of coffee husk extract, an agro-based bio-waste, as a novel and eco-friendly fuel in the synthesis of CHCA and the synthesised nanocomposite as a potential adsorbent for the removal of synthetic dyes.

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“…Different fascinating shapes and morphologies of ZnO have been synthesized so far including nanowires, nanoparticles, nanoflowers, nanoplates, nanorodes, highly porous honey comb like structures etc. via SCS method [118,189,[205][206][207][208][209] . In a recent study Mane et al [210] SCS synthesized 3D flower-like ZnO nanostructures employing m-cresol as fuel at stoichiometric ratio with zinc nitrate.…”

Section: Scs Development Of Binary Metal Oxide Photocatalystsmentioning

confidence: 99%

Solution combustion synthesis: the relevant metrics for producing advanced and nanostructured photocatalysts

et al. 2022

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Influence of fuel nature on dye adsorption efficiency of solution combustion derived zinc oxide nanoparticles: A comparative study

Cited by 22 publications

References 69 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

Solution combustion synthesis of calcium aluminate nanocomposite using coffee husk extract as green fuel and its application in adsorptive amputation of anionic dyes

Solution combustion synthesis: the relevant metrics for producing advanced and nanostructured photocatalysts

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