Attapulgite as Potential Adsorbent for Dissolved Organic Carbon From Oily Water

Mansour Al.Haddabi, Hari Vuthaluru, Hussein Znad, Mushtaque Ahmed

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1522-1530
Number of pages9
JournalClean - Soil, Air, Water
Volume43
Issue number11
DOIs
Publication statusPublished - Nov 1 2015

Fingerprint

Organic carbon
Adsorbents
dissolved organic carbon
Water
adsorption
Adsorption
Isotherms
isotherm
water
Powders
Monolayers
Particle size
particle size
attapulgite
cost
Sorption
Costs
mass transfer
Clay
Mass transfer

Keywords

  • Adsorption
  • DOC
  • Equilibrium isotherms
  • Kinetic models
  • Thermodynamics

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Pollution

Cite this

Attapulgite as Potential Adsorbent for Dissolved Organic Carbon From Oily Water. / Al.Haddabi, Mansour; Vuthaluru, Hari; Znad, Hussein; Ahmed, Mushtaque.

In: Clean - Soil, Air, Water, Vol. 43, No. 11, 01.11.2015, p. 1522-1530.

Research output: Contribution to journalArticle

Al.Haddabi, Mansour ; Vuthaluru, Hari ; Znad, Hussein ; Ahmed, Mushtaque. / Attapulgite as Potential Adsorbent for Dissolved Organic Carbon From Oily Water. In: Clean - Soil, Air, Water. 2015 ; Vol. 43, No. 11. pp. 1522-1530.
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