Sorption studies of 4-NP onto goethite: effects of contact time, pH, concentration, ionic strength and temperature

The effects of different state variables (contact time, pH, concentration, ionic strength and temperature) were investigated on the adsorption of 4-nitrophenol (4-NP) onto goethite for its potential utilization in mitigating water pollution. The results suggested that the adsorption of 4-NP reached a quasi-steady state equilibrium at 24 h and followed pseudo-second order kinetics. The computed value of pseudo-second order rate coefficient for adsorption of 4-NP on goethite was 447.57 kg mM(-1) h(-1). Adsorption of 4-NP on goethite was higher when the solution pH wasC temperature with 1: 100 goethite (sorbent)-solution ratio.

Automated summary

The adsorption of 4-nitrophenol on goethite reached equilibrium at 24 hours and followed pseudo-second order kinetics. Higher adsorption was observed at higher solution pH values on goethite.