Experimental and Modeling Studies for the Removal of Crystal Violet Dye from Aqueous Solutions using Eco-friendly Gracilaria corticata Seaweed Activated Carbon/Zn/Alginate Polymeric Composite Beads

Journal Article · Fri Dec 15 04:00:00 EST 2017 · Journal of Polymers and the Environment

DOI:https://doi.org/10.1007/S10924-016-0879-Z· OSTI ID:22788377

Duraipandian, Jayganesh ^[1]; Rengasamy, Tamilarasan ^[2]; Vadivelu, Sivakumar ^[3]

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1. Anna University-University College of Engineering, Ramanathapuram, Department of Civil Engineering (India)
2. Anna University-University College of Engineering, Pattukottai, Department of Chemistry (India)
3. Anna University-BIT Campus, Tiruchirappalli, Department of Physics (India)

This research article describes, an eco-friendly activated carbon prepared from the Gracilaria corticata seaweeds which was employed for the preparation of biodegradable polymeric beads for the efficient removal of crystal violet dye in an aqueous solution. The presence of chemical functional groups in the adsorbent material was detected using FTIR spectroscopy. The morphology and physical phases of the adsorbent materials were analyzed using SEM and XRD studies respectively. Batch mode dye adsorption behavior of the activated carbon/Zn/alginate polymeric beads was investigated as a function of dosage, solution pH, contact time, initial dye concentration and temperature. Maximum dye removal was observed at a pH of 5.0, 1 g of adsorbent dosage with 60 mg/L dye concentration, 50 min of contact time and at 30 °C. The equilibrium modeling studies were analyzed with Freundlich and Langmuir adsorption isotherms and the adsorption dynamics was predicted with Lagergren’s pseudo-first order, pseudo-second order equations and intra particle diffusion models. The process of dye removal followed a pseudo second-order kinetics rather than pseudo first order. The thermodynamic parameters like standard Gibbs free energy change (ΔG°), enthalpy change (ΔH°) and entropy change (ΔS°) were determined and the results imply that the adsorption process was spontaneous, endothermic and increases the randomness between the adsorbent and adsorbate. The results from the experimental and correlation data reveal that the Gracilaria corticata activated carbon/Zn/alginate polymeric beads have proved to be an excellent adsorbent material for the removal of CV dye.

• OSTI ID: 22788377
• Journal Information: Journal of Polymers and the Environment, Journal Name: Journal of Polymers and the Environment Journal Issue: 4 Vol. 25; ISSN 1566-2543
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATED CARBON
ADSORPTION
ADSORPTION ISOTHERMS
ALGINATES
AQUEOUS SOLUTIONS
CRYSTAL STRUCTURE
ENTHALPY
ENTROPY
FOURIER TRANSFORM SPECTROMETERS
FREE ENTHALPY
METHYL VIOLET
PH VALUE
POLYMERS
SCANNING ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ZINC