Removal of 4-chlorophenol from contaminated water using coconut shell waste pretreated with chemical agents

Tonni Agustiono Kurniawan, Wai Hung Lo, Eveliina Repo, Mika E.T. Sillanpää

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)

Abstract

BACKGROUND: At concentrations higher than 1 mg L-1, 4-chlorophenol (4-CP) is very toxic to living organisms, and if ingested beyond the permitted concentration it causes health disorders such as cancer and mutation. This laboratory study investigates treatment of contaminated water laden with 4-CP using coconut shell charcoal (CSC) waste. Batch studies were conducted to study the effects of dose, pH, and equilibrium time on 4-CP removal. To improve 4-CP removal, surface modification of the adsorbent with TiO2, HNO3, and/or NaOH was undertaken. RESULTS: At an initial 4-CP concentration of 25 mg L-1under optimized conditions (dose 13.5 g L-1, pH 2.0; agitation speed 150 rpm and 50 min equilibrium time), the NaOH-treated CSC demonstrated a greater removal of 4-CP (71%) than those oxidized with HNO3(40%) and/or coated with TiO2(52%). The adsorption capacity of the NaOH-treated CSC (54.65 mg g-1) was higher than those treated with HNO3(23.13 mg g-1) or coated with TiO2(48.42 mg g-1). CONCLUSION: Although treatment results using the NaOH-treated CSC alone were promising, the treated effluents were still unable to meet the required limit of less than 1 mg L-1. Therefore, subsequent treatments are still required to complement the removal of 4-CP from the wastewater.
Original languageEnglish
Pages (from-to)1616-1627
Number of pages12
JournalJournal of Chemical Technology and Biotechnology
Volume85
Issue number12
DOIs
Publication statusPublished - 1 Dec 2010

Keywords

  • Environmental protection
  • Low-cost adsorbent
  • Recalcitrant compounds
  • Surface modification
  • Wastewater treatment

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Waste Management and Disposal
  • Pollution
  • Organic Chemistry
  • Inorganic Chemistry

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