Nitrobenzene Pollutants In The Mixing Process Of The River Pollution Migration Into Behavioral Research

Nitrobenzene is widely used in the area of dyestuff and pharmacy, etc. However, if entering water, nitrobenzene will be a pollutant which is harmful to mankind. The water containing nitrobenzene is in large toxicity, and its potential detrimental impact towards the surrounding environment has received extensive attention. Many countries have made relevant emission control regulations. The estuary of Changjiang River is at a unique location, so it is significant to accurately predict the fate of nitrobenzene in the estuary of Changjiang River, and it is essential to understand the underlying process and mechanisms that regulate its transport and transformation based on the theory of colloid and interface chemistry.The sorption phenomenon predominantly determines the fate of nitrobenzene in natural water systems. Upon enter an aquatic environment, it tends to adhere to the particles in the water and sediments due to the hydrophobic interactions.Sorption kinetic studies show that the equilibrium was quickly reached between 5-6h, so that a contact time of 8h is arbitrarily selected to ensure attainment of Sorption equilibrium.Sorption isotherms are obtained on various combinations of solids and solutes. Isotherms of nitrobenzene onto suspended particles conform with the Henry equation: Cs=KCe, where Cs and Ce are equilibrium solid-phase and aqueous-phase solute concentrations, respectively. The sorption is exothermic reaction, and the value of Qa is minus 2.53kJ/mol.Factors influencing the fate and transport of nitrobenzene have undergone such as light, temperature, the number of suspended particles, different pH values, ionic strengths, and organic fraction on the particlessuspended.The suface characters such as Zeta potential, wetting-capability of the suspended particle and of the particles adhering nitrobenzene have studied. When the organic fraction on the particles demolished partly , the minus Zeta potential becomes larger in value, but the sorption of nitrobenzene doesn't influence the Zeta potential evidently. When the suspended particles have adsorbed nitrobenzene, the solubility of particle is improved. The mechanism might be that the phenyl of the nitrobenzene adhere to the organic matter on the suspended particles.The impact of humic acid to the sorption is also studied.This model combines a series of sorption including the adsorption of nitrobenzene on organic matter such as humics, the sorption of nitrobenzene on particles with or without the presence of dissolved humics, the sorption of nitrobenzene on the suspended particle which has been dealt with humic acid . The existence of dissolved humic restrains the sorption of nitrobenzene. Humic acid alone will also adsorb nitrobenzene. The particles dealt with humic acid have more organic matter on it, so it advanced the sorption, for the phenyl of the nitrobenzene can adhere to the organic matter more easily. The sorption isotherms of nitrobenzene onto suspended particles when humic acid coexists also conform with the Henry equation.