Effect of copper on the adsorption of p-nitrophenol onto soils

Abstract

The effect of copper on adsorption of p-nitrophenol on two typical Chinese soils was investigated using a batch-equilibration method. Adsorption experiments were carried out when both copper and p-nitrophenol were adsorbed simultaneously, and when copper was previously adsorbed on soils. It was observed that adsorption of p-nitrophenol decreased with increasing copper concentrations thereby indicating a competition between copper and p-nitrophenol for occupying the adsorption sites on soils. Moisture increased the hydrated sphere and the acidity of water surrounding the cation, which further reduced the adsorption of p-nitrophenol. Fourier transform infrared spectroscopy study provided the direct evidence for the coordination of p-nitrophenol sorbed by soils with metal cation in n-hexane system. It was observed that the perturbations included a red shift of the n asym (NO) band, a concomitant blue-shift of the n sym (NO) band and a blue-shift of CeN band when compared with the infrared spectra obtained from water solution.

Effect of lead on the sorption of phenol onto montmorillonites and organo-montmorillonites

“…When pH was higher than 2 units of its pK a 9.89, deprotonated phenol is predominated. At higher pH, the decreased phenol sorption may be caused by the electrostatic repulsion between the reactive surface sites and the negatively charged phenol molecules [11,30]. Moreover, the sorbent is a key factor since the charge density on a given solid is dependent on the surrounding conditions.…”

“…There are few reports available in this field [29,30]. In the present study, Pb and phenol were chosen as representatives of heavy metals and toxic organic pollutants, respectively.…”

Adsorption of lambda-cyhalothrin and cypermethrin on two typical Chinese soils as affected by copper

“…There are several reports about the effect of Cu on the adsorption organic contaminants on soils (Pei et al 2006;Dousset et al 2007) and they illustrated that the effect of Cu on the adsorption of different compounds were different. Pei et al (2006) showed that the adsorption of p-nitrophenol decreased with increasing Cu concentrations due to a competition between Cu and p-nitrophenol for occupying the adsorption sites on soils.…”

“…Numerous studies have been undertaken to investigate the adsorption and desorption on soil of either heavy metals (Sõukand et al 2002;During et al 2003;Ribeiro et al 2004) or organic contaminants (Lengyel and Foldenyi 2003;Gimsing et al 2004;Litz et al 2007;Gonzalez et al 2008) separately. Recently, the fate of Pys in the environment had been investigated (Oudou and Hansen 2002a;Singh and Singh 2004;Ismail and Kalithasan 2005), however, little attention has been given to determine the effect of Cu on the adsorption of organic contaminants on soils (Pei et al 2006;Dousset et al 2007). Even more, there were few studies on the interaction of Pys and Cu in soil.…”

The Influence of Surfactants and Metals on the Mineralization of 14C-Labeled Methyl Parathion in a Mediterranean Soil under Aerobic Conditions

“…The sorption of organic contaminants may be reduced when copper is present (Pei et al 2006;Liu et al 2009), because the positively charged metals have stronger adsorption affinity for sorption sites than neutral organic compounds, and thus occupy preferably those sorption sites or release the already sorbed organic compounds. On the contrary, other reports indicate an increase in the retention of organic compounds in the presence of metals such as copper, zinc, or lead (Gao et al 2006).…”