4.4 Article

Plant extract as environmental-friendly green catalyst for the reduction of hexavalent chromium in tannery effluent

Journal

ENVIRONMENTAL TECHNOLOGY
Volume 39, Issue 11, Pages 1376-1383

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2017.1329355

Keywords

Chromium reduction; green catalyst; Coriandrum sativum; antioxidant; alpha-hydroxy acid

Funding

  1. Periyar University, Tamil Nadu, India
  2. Science and Engineering Research Board, India [PDF/2015/000252]
  3. Department of Science and Technology, Ministry of Science and Technology, India [IF140651]

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The aqueous extract of various plants like Coriandrum sativum (AECS), Alternanthera tenella colla (AEAT), Spermacoce hispida (AESH) and Mollugo verticillata (AEMV) was studied for its hexavalent chromium (Cr-VI) reduction property. Even though antioxidant activity was present, AEAT, AESH and AEMV did not reduce Cr-VI. AECS showed rapid and dose-dependent Cr-VI reduction. The efficient reduction of 50mg/L of Cr-VI using AECS was attained in the presence of 250 mu g/mL of starting plant material, incubating the reaction mixture at pH 2, 30 degrees C and agitation at 190rpm. Under such conditions, about 40mg/L of Cr-VI was reduced at 3h of incubation. FT-IR analysis revealed the involvement of phenols, alcohols, alpha-hydroxy acid and flavonoids present in the AECS for the Cr-VI reduction. These results indicate that not all the plant extracts with rich antioxidants are capable of reducing Cr-VI. Using the conditions standardized in the present study, AECS reduced about 80% of Cr-VI present in the tannery effluent. These results signify the application of AECS as an eco-friendly method in the wastewater treatment.

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