Thermodynamics of adsorption of direct navy blue and disperse red dyes from simulated textile mill effluent using vermiculite as adsorbent.

Date

4-2008

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Amelia E. Parao

Committee Member

Catalino G. Alfafara, Jerico R. Aguila

Abstract

A study conducted to determine the thermodynamic properties of adsorption of Disperse Red and Direct Navy Blue Dyes from simulated textile using vermiculite as adsorbent. The effects of different temperatures (35°C, 45°C, and 55°C) on the adsorption kinetics and the adsorption isotherm of each dye were determined. The concentration decay curves of each dye at different temperatures show that an increase in temperature affected an increase in the maximum adsorptive capacity of the dye into the adsorbent. For DR dye, the maximum adsorptive capacity at 35°C, 45°C and 55°C were 10.403, 16.414 and 15,399 mg dye/g vermiculite, respectively. For DNB dye, the maximum adsorptive capacity at 30°C, 50°C and 60°C were 10.267, 11.867 and 20.135mg dye/g vermiculite, respectively. The orders of reaction followed by DNB and DR at all experimental temperatures were 2ⁿᵈ and 1ˢᵗ order, respectively. The Freunddlich isotherm model better fits the adsorption of DR dye than Langmuir isotherm while DNB followed neither of the two. Freundlich isotherm model parameters (Kf and n) were used for the calculations of the thermodynamics of adsorption of DR onto vermiculite. The affinity of the dyes onto vermiculite was determined by calculating the thermodynamics parameters of adsorption: (1) enthalpy, (2) Gibb's free energy and (3) entrophy of adsorption. The computed values for DR are as follows: enthalpy is -97,997.118 j/g mol; Gibb's free energy at 35°C, 45°C, and 55°C are 5273.537 J/mol, and 11816.004 J/mol, respectively; and entrophy at 35°C, 45°C, and 55°C are 335.1311 J/molK, 358.1668J/molK, and 334.6431 J/molK respectively. The obtained graphs from the experiments for DNB were not able to show observable trends rendering it difficult to establish thermodynamic trends.

Language

English

LC Subject

Adsorption, Textile, Dyes and drying

Location

UPLB College of Engineering and Agro-Industrial Technology

Call Number

LG 993.5 2008 E62 F37

Document Type

Thesis

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