TY - JOUR
T1 - Attapulgite as Potential Adsorbent for Dissolved Organic Carbon From Oily Water
AU - Al.Haddabi, Mansour
AU - Vuthaluru, Hari
AU - Znad, Hussein
AU - Ahmed, Mushtaque
N1 - Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
PY - 2015/11/1
Y1 - 2015/11/1
N2 - The adsorption capacity of attapulgite, a natural clay, for the removal of dissolved organic carbon (DOC) from oily water was investigated in a batch system. The aim of this study was to understand the mechanism associated with the removal of DOC by attapulgite. The effectiveness of attapulgite to adsorb DOC was investigated as a function of equilibrium time, initial DOC concentration, solution pH, temperature, and attapulgite concentration. Two particle sizes of attapulgite were used, granular (1 mm) and powder (0.25 mm). In most cases, the equilibrium data fit best with the Langmuir isotherm. The maximum monolayer coverage was found to be 31 mg/g for granular and 65 mg/g for powder attapulgite. The separation factor, RL, from the Langmuir isotherm and, n, the constant from the Freundlich isotherm indicated favorable adsorption. Changes in the pH of the oily water had no significant influence on the adsorption capacity. The adsorption follows the pseudo-second order model. The governing transport mechanisms in the sorption process appear to be both external mass transfer and intra-particle diffusion. The adsorption process was found exothermic in nature. The Langmuir isotherm model equation was adopted to design a single-stage batch absorber for DOC adsorption onto attapulgite. The study demonstrated that attapulgite can be utilized as a potential alternative low-cost adsorbent for the removal of DOC from oily water. The applicability of attapulgite as an adsorbent for the removal of dissolved organic carbon (DOC) from oily water was investigated. Two particle sizes of attapulgite are used. The maximum monolayer coverage is found to be 31 mg/g for granular attapulgite and 65 mg/g for powder attapulgite. The study demonstrated that attapulgite can be utilized as a potential alternative low-cost adsorbent for the removal of DOC from oily water.
AB - The adsorption capacity of attapulgite, a natural clay, for the removal of dissolved organic carbon (DOC) from oily water was investigated in a batch system. The aim of this study was to understand the mechanism associated with the removal of DOC by attapulgite. The effectiveness of attapulgite to adsorb DOC was investigated as a function of equilibrium time, initial DOC concentration, solution pH, temperature, and attapulgite concentration. Two particle sizes of attapulgite were used, granular (1 mm) and powder (0.25 mm). In most cases, the equilibrium data fit best with the Langmuir isotherm. The maximum monolayer coverage was found to be 31 mg/g for granular and 65 mg/g for powder attapulgite. The separation factor, RL, from the Langmuir isotherm and, n, the constant from the Freundlich isotherm indicated favorable adsorption. Changes in the pH of the oily water had no significant influence on the adsorption capacity. The adsorption follows the pseudo-second order model. The governing transport mechanisms in the sorption process appear to be both external mass transfer and intra-particle diffusion. The adsorption process was found exothermic in nature. The Langmuir isotherm model equation was adopted to design a single-stage batch absorber for DOC adsorption onto attapulgite. The study demonstrated that attapulgite can be utilized as a potential alternative low-cost adsorbent for the removal of DOC from oily water. The applicability of attapulgite as an adsorbent for the removal of dissolved organic carbon (DOC) from oily water was investigated. Two particle sizes of attapulgite are used. The maximum monolayer coverage is found to be 31 mg/g for granular attapulgite and 65 mg/g for powder attapulgite. The study demonstrated that attapulgite can be utilized as a potential alternative low-cost adsorbent for the removal of DOC from oily water.
KW - Adsorption
KW - DOC
KW - Equilibrium isotherms
KW - Kinetic models
KW - Thermodynamics
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U2 - 10.1002/clen.201500073
DO - 10.1002/clen.201500073
M3 - Article
AN - SCOPUS:84949196623
SN - 1863-0650
VL - 43
SP - 1522
EP - 1530
JO - Clean - Soil, Air, Water
JF - Clean - Soil, Air, Water
IS - 11
ER -