Sorption characteristics of peat of Brunei Darussalam V: removal of Congo red dye from aqueous solution by peat

Zehra, Tasneem; Priyantha, Namal; Lim, Linda B.L.; Iqbal, Erum

doi:10.1080/19443994.2014.899929

Cited by 54 publications

(16 citation statements)

References 33 publications

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“…The pH pzc of the adsorbent was determined by the salt addition method using 0.1 M KNO 3 solutions [20]. The Waste Biomass Valor initial pH (2.5-10.0) of 20 mL KNO 3 was adjusted using 0.1 M HNO 3 and NaOH, and the pH was measured.…”

Section: Point Of Zero Chargementioning

confidence: 99%

Azolla pinnata: An Efficient Low Cost Material for Removal of Methyl Violet 2B by Using Adsorption Method

Kooh

Lim

Dahri

et al. 2015

Waste Biomass Valor

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Azolla pinnata (AP), a floating aquatic macrophyte, was studied as a potential adsorbent for the removal of methyl violet (MV) in a batch adsorption system. Surface characterisation, effects of particle size, adsorbent dosage, pH, ionic strength and pre-treatments of adsorbent were carried out. The study of the effects of pH and ionic strength suggested that electronic interaction and hydrophobic-hydrophobic interaction might be the major forces of dye interaction. Pseudo 2nd order kinetic model best-fitted the kinetic data indicating that the adsorption process may be controlled by chemical process. The Weber-Morris and Boyd models were used for describing the diffusion mechanism which showed that intraparticle diffusion was not the rate limiting step, and film diffusion or in combination of other mechanisms might be in control. Isotherm modelling showed that the Langmuir model best-fitted the experimental data with q m of 194.2 mg g -1 at 25°C and 323.4 mg g -1 at 65°C. Thermodynamic studies showed that the adsorption process is endothermic, spontaneous and with significant change to the internal structure of adsorbent. The estimated activation energy by Arrhenius equation is 54.8 kJ mol -1 , which indicates that the adsorption process may be controlled by chemical process. Adsorbent regenerated using NaOH displayed retention of high adsorption capability almost similar to fresh adsorbent even after five consecutive cycles. Ability to regenerate coupled with good adsorption capability suggests that AP has great potential to be utilised as a low-cost adsorbent for the removal of MV in real life application.

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Section: Point Of Zero Chargementioning

confidence: 99%

Azolla pinnata: An Efficient Low Cost Material for Removal of Methyl Violet 2B by Using Adsorption Method

Kooh

Lim

Dahri

et al. 2015

Waste Biomass Valor

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“…The surface morphology analyses of the adsorbents were carried out using a scanning electron microscope (SEM) (Tescan Vega XMU). The determination of the adsorbents' point of zero charge (pH pzc ) was done by salt addition approach using 0.1 mol L -1 KNO 3 solutions (Zehra et al 2015). All measurements of pH were done using a Thermo-Scientific digital pH meter.…”

Section: Characterisations Of Adsorbentsmentioning

confidence: 99%

Removal of methyl violet 2B dye from aqueous solution using Nepenthes rafflesiana pitcher and leaves

2017

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This study reported Nepenthes rafflesiana pitcher (NP) and Nepenthes rafflesiana leaves (NL) as new adsorbents for methyl violet (MV) dye. The experiments were done using 2 h contact time and without any pH alteration (pH 4.4). The effects of pH and ionic strength revealed hydrophobic-hydrophobic interaction as the predominant force of dye interaction with the adsorbent. Both NP-MV and NL-MV followed pseudo-second-order model indicating the adsorption processes may be governed by chemical process. Weber-Morris intraparticle diffusion model verified that the rate-limiting step of both the NP-MV and NL-MV systems is not intraparticle diffusion. The Langmuir model best described the adsorption process with high maximum monolayer adsorption (q m ) of 288.7 and 194.0 mg g -1 for NP-MV and NL-MV, respectively. Thermodynamics studies revealed both NP-MV and NL-MV systems are spontaneous and endothermic in nature. From the regeneration study, it was found that NP's and NL's adsorption capacities could be recovered using distilled water and base whereby distilled water was able to recover 78% (NP) and 71% (NL) while base was able to recover 82% for both samples after three regeneration cycles.

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“…Till now, the methods for the removal of ions and dyes from wastewater are adsorption [8][9][10][11] [12,13], precipitation [14], electrochemical oxidation [15,16], ultrafiltration [17], adsorptionphotocatalytic degradation, etc. [18].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of malachite green and crystal violet cationic dyes from aqueous solution using pumice stone as a low-cost adsorbent: kinetic, equilibrium, and thermodynamic studies

Shayesteh

Rahbar-Kelishami

Norouzbeigi

2016

Desalination and Water Treatment

111

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In this study, the sorption potential of pumice was investigated as geomaterial adsorbent for removal of two cationic dyes, malachite green (MG) and crystal violet (CV), from aqueous solution. In batch experiments, the effects of contact time, particle size, absorbent dose, solution pH, initial dye concentration, and temperature of MG and CV ions on the pumice adsorption capacity was studied. The characterization of the pumice has been accomplished by X-ray fluorescence spectroscopy, scanning electron microscope, and Brunauer-EmmettTeller technologies. Equilibrium data were accurately fitted onto Langmuir, Freundlich, and Temkin isotherms. The results showed that the adsorption isotherm data were fitted well to the Langmuir isotherm and the maximum adsorption capacities calculated were 22.57 and 6.99 mg/g for MG and CV at 25˚C, respectively. The kinetic data for both dyes were better described by the pseudo-second-order kinetic model. The thermodynamic parameters such as ΔG˚, ΔH˚, and ΔS˚were also evaluated. The positive ΔH˚and ΔS˚values described endothermic nature of the adsorption and the affinity of pumice for MG and CV adsorption, respectively. It is expected that pumice can be considered as a low-cost adsorbent for the removal of dyes from wastewater.

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Sorption characteristics of peat of Brunei Darussalam V: removal of Congo red dye from aqueous solution by peat

Cited by 54 publications

References 33 publications

Azolla pinnata: An Efficient Low Cost Material for Removal of Methyl Violet 2B by Using Adsorption Method

Azolla pinnata: An Efficient Low Cost Material for Removal of Methyl Violet 2B by Using Adsorption Method

Removal of methyl violet 2B dye from aqueous solution using Nepenthes rafflesiana pitcher and leaves

Adsorption of malachite green and crystal violet cationic dyes from aqueous solution using pumice stone as a low-cost adsorbent: kinetic, equilibrium, and thermodynamic studies

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