竹炭吸附對(duì)硝基苯胺的過(guò)程與機(jī)理研究
[Abstract]:The factors affecting the adsorption of p-nitroaniline by bamboo charcoal and the kinetics, isotherm and thermodynamics of the adsorption process were studied. The results showed that the adsorption efficiency of p-nitroaniline could be achieved by bamboo charcoal with a particle size of 80 ~ 100, and the adsorption efficiency was 95.65. The adsorption efficiency of p-nitroaniline from bamboo charcoal decreased with the increase of the pH value of the solution. When the pH value of the solution exceeded 7.0, the decreasing trend was accelerated obviously. Under the experimental conditions, the solution pH=2.0 could obtain the best adsorption effect. The adsorption efficiency is 95.85. The combined action of electrostatic force and hydrogen bond force under different pH values is the main reason for the change of adsorption efficiency. The results of adsorption kinetics study show that the quasi-second-order adsorption kinetic model can fit the adsorption rate data at three different temperatures. The results of adsorption isotherm study show that the adsorption isotherm model of RedlichPeterson can fit the adsorption isotherm data at three different temperatures, which indicates that the adsorption process has the characteristics of monolayer adsorption and adsorption surface heterogeneity. The calculated results of adsorption thermodynamics show that the Gibbs free energy 螖 G _ (0) is less than zero, which indicates that the adsorption of p-nitroaniline on bamboo charcoal can be carried out spontaneously, and the adsorption enthalpy 螖 H _ (0) is less than zero, indicating that the adsorption reaction is an exothermic process. The adsorption enthalpy variable value is larger than that caused by van der Waals force alone, which indicates that there are many kinds of forces in the adsorption process. The change of adsorption entropy 螖 S0 is greater than zero, which indicates that the degree of confusion in the adsorption process increases significantly.
【作者單位】: 南京林業(yè)大學(xué)生物與環(huán)境學(xué)院;香港浸會(huì)大學(xué)研究生院;北卡羅來(lái)納州立大學(xué)土木建筑與環(huán)境學(xué)院;
【基金】:江蘇省高校優(yōu)勢(shì)學(xué)科建設(shè)工程重點(diǎn)序列學(xué)科項(xiàng)目
【分類(lèi)號(hào)】:X703.1
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