Influence of organic carbon and metal oxide phases on sorption of 2,4,6-trichlorobenzoic acid under oxic and anoxic conditions

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• 作者：Isaac Ayodele Ololade (1)
  Nurudeen Abiola Oladoja (1) (2)
  Folasade Alomaja (1)
  Oluwaranti Olubunmi Ololade (3)
  Esan O. Olaseni (1)
  Femi Francis Oloye (1) (4)
  Ruth O. A. Adelagun (5)
  
• 关键词：2 ; 4 ; 6 ; Trichlorobenzoic acid ; Adsorption ; Kinetics ; Oxic and anoxic ; Redox potential
• 刊名：Environmental Monitoring and Assessment
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：187
• 期：1
• 全文大小：914 KB
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• 作者单位：Isaac Ayodele Ololade (1)
  Nurudeen Abiola Oladoja (1) (2)
  Folasade Alomaja (1)
  Oluwaranti Olubunmi Ololade (3)
  Esan O. Olaseni (1)
  Femi Francis Oloye (1) (4)
  Ruth O. A. Adelagun (5)
  
  1. Department of Chemical Sciences, Adekunle Ajasin University, PMB 001, Akungba-Akoko, Ondo-State, Nigeria
  2. Institute of Water Quality Control, Technical University Munich, Gerching, Munich, Germany
  3. Federal University of Technology, Akure, Nigeria
  4. Chemistry Department, University of Aberdeen, Scotland, UK
  5. Chemical Science Department, Federal University Wukari, Taraba State, Nigeria
  
• ISSN：1573-2959

文摘

Chlorobenzoic acids represent crucial recalcitrant metabolites in the environment; thus, the influence of soil components on the sorption of 2,4,6-trichlorobenzoic acid (TCB) under oxic and anoxic conditions was studied. The surficial physiognomies of untreated and isolated soil samples were studied using FTIR, XRD, specific surface area, and PZC determination. The roles of redox potential, dissolved organic carbon (DOC), and pH, particularly under anoxic condition, were appraised. Batch equilibrium adsorption studies on soils of variable Fe/Mn oxides and organic carbon showed that adsorption was low across all components (log K oc--.82-.10 Lg?). The sorption of 2,4,6-TCB was well described by the pseudo second-order kinetic model. The fluctuation of both redox potential and pH during anoxic experiment had a negative impact on the sorption, partitioning, and the oxidation of organic matter. Linear relationships were observed for K d with both soil total organic carbon (TOC) and surface area (SA). The results showed the existence of DOC-mediated sorption of 2,4,6-TCB which seems to be enhanced at lower pH. The reductive dissolution, particularly of iron compounds, possibly impeded sorption of 2,4,6-TCB under anoxic condition. It could be inferred that habitats dominated by fluctuating oxygen concentrations are best suited for the development of environmental conditions capable of mineralizing 2,4,6-TCB and similar xenobiotics.