Scavenging Rhodamine B dye using moringa oleifera seed pod

Moringa oliferia seed pod was modified using orthophosphoric acid (H 3 PO 4 ) and used as adsorbent for sequestering Rhodamine B (Rh-B) dye from aqueous solution. The acid-modified adsorbent (MOSPAC) was characterized using Scanning Electron microscopy (SEM), Fourier Transform Infra Red (FTIR), Ener...

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Bibliographic Details
Published inChemical speciation and bioavailability Vol. 29; no. 1; pp. 120 - 134
Main Authors Bello, Olugbenga Solomon, Lasisi, Bukola Morenike, Adigun, Olamide Joshua, Ephraim, Vunain
Format Journal Article
LanguageEnglish
Published St. Albans Taylor & Francis 01.01.2017
Taylor & Francis Ltd
Taylor & Francis Group
Subjects
Adsorbents
Adsorption
Aqueous solutions
batch systems
Data
Dyes
Electron microscopy
Endothermic reactions
endothermy
energy-dispersive X-ray analysis
Feasibility studies
Fourier transform infrared spectroscopy
Fourier transforms
Isotherms
kinetics
Moringa oleifera
moringa seed pod
pH effects
phosphoric acid
Removal
Rhodamine
Rhodamine B
rhodamines
Scanning electron microscopy
Scavenging
Sequestering
Solutions
sorption isotherms
temperature
thermodynamics
Titration
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Summary:Moringa oliferia seed pod was modified using orthophosphoric acid (H 3 PO 4 ) and used as adsorbent for sequestering Rhodamine B (Rh-B) dye from aqueous solution. The acid-modified adsorbent (MOSPAC) was characterized using Scanning Electron microscopy (SEM), Fourier Transform Infra Red (FTIR), Energy Dispersive X-ray (EDX), pH point of zero charge (pH pzc ) and Boehm Titration (BT) techniques, respectively. Operational parameters such as contact time, initial dye concentration, adsorbent dosage, pH and solution temperature were studied in batch process. Optimum dye adsorption was observed at pH 3.01. Equilibrium adsorption data was tested data using four different isotherm models: Langmuir, Freundlich, Temkin and Dubinin-Radushkevich. Langmuir isotherm model fitted most with maximum monolayer adsorption capacity of 1250 mg g -1 . Pseudo-second-order kinetic model provided the best correlation for the experimental data. Thermodynamic study showed that the process is endothermic, spontaneous and feasible. MOSPAC is an effective adsorbent for the removal of RhB dye from aqueous solutions.
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ISSN:0954-2299
2639-5932
2047-6523
2639-5940
DOI:10.1080/09542299.2017.1356694