Interactive influence of Fe-Mn and organic matter on pentachlorophenol sorption under oxic and anoxic conditions

被引：7

作者：

Ololade, Oluwaranti O. ^{[1
]}

Ololade, Isaac A. ^{[2
]}

Ajayi, Olubode O. ^{[1
]}

Oladoja, Nurudeen A. ^{[2
,3
]}

Alomaja, Folasade ^{[2
]}

Oloye, Francis F. ^{[2
,4
]}

Adelagun, Ruth O. A. ^{[5
]}

Agbeniyi, Adetola ^{[2
]}

Alabi, Bosede A. ^{[1
]}

Akerele, Daniel D. ^{[2
]}

机构：

[1] Fed Univ Technol Akure, Akure, Nigeria

[2] Adekunle Ajasin Univ, Dept Chem Sci, PMB 001, Akungba Akoko, Ondo State, Nigeria

[3] Tech Univ Munich, Inst Water Qual Control, Munich, Germany

[4] Univ Aberdeen, Dept Chem, Aberdeen AB9 1FX, Scotland

[5] Fed Univ Wukari, Dept Chem Sci, Wukari, Taraba State, Nigeria

来源：

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2016年 / 4卷 / 02期

关键词：

Pentachlorophenol; Sorption; Organic matter; Anoxic condition; Geosorbents;

D O I：

10.1016/j.jece.2016.03.001

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study examined the adsorption of pentachlorophenol (PCP) on geosorbents (original bulk soil and soils treated to significantly remove organic carbon and oxides of Fe and Mn) under oxic and anoxic experimental conditions. pH effects on adsorption capacities were maximal at pH < pK(a) of PCP (4.7). Decrease in redox potential and an increase in dissolve organic carbon inhibited PCP sorption. While contribution of Mn oxide to PCP sorption was negative due to decreasing charge interference, the study equally implied negligible role of surface area compared to organic matter contents and oxides of Fe with R-2 <= 0.825. The rate of Fe2+ and Mn2+ release under anoxic condition reduced interactions of phenolate with iron oxides and consequently, the distribution coefficients coupled with increased dissolve organic carbon. Pseudo second order and Langmuir isotherm provided the best kinetic and isotherm models respectively, although adsorption processes appeared to involve more than one kinetic stage based on intra-particle diffusion model (R-2 <= 0.982). The study suggests that soil treatment to remove Mn oxide may encourage transitory PCP sinks in some reductomorphic environments. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：1899 / 1909

页数：11