在探究磷酸改性杨树叶的条件基础上,研究接触时间、硝基苯溶液初始浓度、温度等因素对改性过后的杨树叶吸附硝基苯性能的影响。结果表明,在25℃,用2 mol/L磷酸溶液按照15 m L/g的改性剂用量改性后,杨树叶对硝基苯的吸附在70 min左右达...在探究磷酸改性杨树叶的条件基础上,研究接触时间、硝基苯溶液初始浓度、温度等因素对改性过后的杨树叶吸附硝基苯性能的影响。结果表明,在25℃,用2 mol/L磷酸溶液按照15 m L/g的改性剂用量改性后,杨树叶对硝基苯的吸附在70 min左右达到基本平衡,吸附过程满足准二级吸附动力学模型。随着硝基苯溶液初始浓度的增加,吸附率不断降低,吸附等温线满足Freundlich方程。吸附过程为放热过程,随着温度的升高,吸附效果下降。展开更多
[Objective] The research was aimed to study the adsorption behavior of p-nitroaniline from aqueous solution by porous hollow carbonaceous spheres （PHCSs）.[Method] The effects of pH,temperature and amount of carbonac...[Objective] The research was aimed to study the adsorption behavior of p-nitroaniline from aqueous solution by porous hollow carbonaceous spheres （PHCSs）.[Method] The effects of pH,temperature and amount of carbonaceous microspheres on adsorption behavior of p-nitroaniline were investigated.[Result] The adsorption amount was affected by temperature slightly,and it decreased with the increase of temperature within a certain range.PHCSs had a higher adsorption capacity as pH was in the range of 2.0-8.0.The adsorption amount of p-nitroaniline was proportional to PHCSs amount within a certain range until it reached a saturation level.The adsorption isotherms of p-nitroaniline appeared to be nonlinear and obeyed to Freundlich equation very well.[Conclusion] The amphiphilic property and the specific chemical functional groups of PHCSs enable them to be a potentially excellent sorbent.展开更多
The adsorption of 2,4-dinitrophenol and 2.6-dinitrophenol on non-polar and polar adsorbents was studied. The results showed that the equilibrium adsorption did not comply with the Langmuir equation and was not mono-la...The adsorption of 2,4-dinitrophenol and 2.6-dinitrophenol on non-polar and polar adsorbents was studied. The results showed that the equilibrium adsorption did not comply with the Langmuir equation and was not mono-layer absorption. It is of interest to notice that the effect of pH on the adsorption of 2.4-or 2,6-dinitrophenol onto ADS-7 and ADS-21 was very small. The result is explained by hydrogen bonding interaction between 2, 4- or 2. 6-dinitrophenol and the adsorbent ADS21. The large adsorption capacity of dinitrophenol onto ADS-21, which was about 500 mg/g at an equilibrium concentration of 400 mg/L. and the small dinitrophenol leakage in the effluent from ADS- 21 column presented a good prospect for treatment of wastewater containing dinitrophenol with absorbent ADS-21.展开更多
The adsorption of phenol and nitrophenols on hypercrosslinked polymeric adsorbent was studied as a function of the solution concentration and temperature. Adsorption isotherms of phenol and nitrophenols on hypercrossl...The adsorption of phenol and nitrophenols on hypercrosslinked polymeric adsorbent was studied as a function of the solution concentration and temperature. Adsorption isotherms of phenol and nitrophenols on hypercrosslinked resin were determined. These isotherms were modeled according to the Freundlich adsorption isotherm. The isotherms for phenol and nitrophenols on hypercrosslinked resin were assigned as L curves. Thermodynamic parameters were calculated for all phenol and nitrophenols. The kinetics experiment results showed that the adsorption rates were of the first-order kinetics. The rate constants at 303K were calculated.展开更多
The adsorption of phenol, p-nitrophenol and 2,4-dinitrophenol in aqueous phase on activated carbon is performed by evaluating factors such as the pH of the solution, it is found that the value in adsorbate molecule is...The adsorption of phenol, p-nitrophenol and 2,4-dinitrophenol in aqueous phase on activated carbon is performed by evaluating factors such as the pH of the solution, it is found that the value in adsorbate molecule is upper and lower of its respective pKa. Likewise, the heterogeneity of the adsorbent solid is evaluated using commercial activated carbon, which is modified by means of oxidation with HNO3 and reduction with H2 fluxing at high temperature, treatments represent variatians in textural properties of solid which changed equally the superficial chemistry of the same. The major concentration of retained plLenol compound in some samples of carbon is produced in pH values which the solute is basically molecular.展开更多
文摘在探究磷酸改性杨树叶的条件基础上,研究接触时间、硝基苯溶液初始浓度、温度等因素对改性过后的杨树叶吸附硝基苯性能的影响。结果表明,在25℃,用2 mol/L磷酸溶液按照15 m L/g的改性剂用量改性后,杨树叶对硝基苯的吸附在70 min左右达到基本平衡,吸附过程满足准二级吸附动力学模型。随着硝基苯溶液初始浓度的增加,吸附率不断降低,吸附等温线满足Freundlich方程。吸附过程为放热过程,随着温度的升高,吸附效果下降。
文摘[Objective] The research was aimed to study the adsorption behavior of p-nitroaniline from aqueous solution by porous hollow carbonaceous spheres （PHCSs）.[Method] The effects of pH,temperature and amount of carbonaceous microspheres on adsorption behavior of p-nitroaniline were investigated.[Result] The adsorption amount was affected by temperature slightly,and it decreased with the increase of temperature within a certain range.PHCSs had a higher adsorption capacity as pH was in the range of 2.0-8.0.The adsorption amount of p-nitroaniline was proportional to PHCSs amount within a certain range until it reached a saturation level.The adsorption isotherms of p-nitroaniline appeared to be nonlinear and obeyed to Freundlich equation very well.[Conclusion] The amphiphilic property and the specific chemical functional groups of PHCSs enable them to be a potentially excellent sorbent.
基金Supported by the National Natural Science Foundation of China !(Grant No. 29574164)
文摘The adsorption of 2,4-dinitrophenol and 2.6-dinitrophenol on non-polar and polar adsorbents was studied. The results showed that the equilibrium adsorption did not comply with the Langmuir equation and was not mono-layer absorption. It is of interest to notice that the effect of pH on the adsorption of 2.4-or 2,6-dinitrophenol onto ADS-7 and ADS-21 was very small. The result is explained by hydrogen bonding interaction between 2, 4- or 2. 6-dinitrophenol and the adsorbent ADS21. The large adsorption capacity of dinitrophenol onto ADS-21, which was about 500 mg/g at an equilibrium concentration of 400 mg/L. and the small dinitrophenol leakage in the effluent from ADS- 21 column presented a good prospect for treatment of wastewater containing dinitrophenol with absorbent ADS-21.
文摘The adsorption of phenol and nitrophenols on hypercrosslinked polymeric adsorbent was studied as a function of the solution concentration and temperature. Adsorption isotherms of phenol and nitrophenols on hypercrosslinked resin were determined. These isotherms were modeled according to the Freundlich adsorption isotherm. The isotherms for phenol and nitrophenols on hypercrosslinked resin were assigned as L curves. Thermodynamic parameters were calculated for all phenol and nitrophenols. The kinetics experiment results showed that the adsorption rates were of the first-order kinetics. The rate constants at 303K were calculated.
文摘The adsorption of phenol, p-nitrophenol and 2,4-dinitrophenol in aqueous phase on activated carbon is performed by evaluating factors such as the pH of the solution, it is found that the value in adsorbate molecule is upper and lower of its respective pKa. Likewise, the heterogeneity of the adsorbent solid is evaluated using commercial activated carbon, which is modified by means of oxidation with HNO3 and reduction with H2 fluxing at high temperature, treatments represent variatians in textural properties of solid which changed equally the superficial chemistry of the same. The major concentration of retained plLenol compound in some samples of carbon is produced in pH values which the solute is basically molecular.
