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研究论文

β-苯胺基苯丙酮在铁电极上吸附动力学的研究

  • 汪的华
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  • 武汉大学环境科学系

收稿日期: 1998-02-28

  修回日期: 1998-02-28

  网络出版日期: 1998-02-28

A Study of Adsorption Kinetics of β-phenylaminopropiophenone on Iron in Acid Solution

  • Wang Dihua Bu Xianzhang Zou Jinyun Gan Fuxing
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  • (Dept. of Envir. Sci., Wuhan Univ., Wuhan 430072)

Received date: 1998-02-28

  Revised date: 1998-02-28

  Online published: 1998-02-28

摘要

用计时电流法研究了0.5mol/LH2SO4溶液中β-苯胺基苯丙酮(PAP)、卤素离子(Cl-,I-)在铁电极上的吸附动力学行为以及Cl-对PAP吸、脱附速度的影响,求得了吸、脱附速度常数ka、kd和吸附自由能参数f值.结果表明,当PAP发生化学吸附时,ka比kd约大2个数量级,吸附粒子间存在吸引力.在电极表面已吸附有Cl-的条件下,且当PAP浓度较低时发生静电吸附,ka比kd约大4个数量级,吸附粒子间存在排斥力;浓度高时则发生化学吸附.

本文引用格式

汪的华 . β-苯胺基苯丙酮在铁电极上吸附动力学的研究[J]. 电化学, 1998 , 4(1) : 37 -41 . DOI: 10.61558/2993-074X.2675

Abstract

The adsorption kinetics of β-phenylaminopropiophenone (PAP) on iron electrode in 0.5 mol/L H_2SO_4 solution with or without Cl~- were investigated by chronoamperometry. According to the following adsorption kinetic equation dθ/dt=kaCen-1(1-θ)nexp(fθ/2)-kdθexp(-fθ/2)The rate constants ka, kd as well as the adsorption free energy parameter f of PAP in sulfuric acid soltuion was calculated by used a computerized curve fitting program, the calculated ka, kd are in the order of 10~-1 mol/L s~-1 and 10~-3 s-1, respectively, f>0 in the concentration region of 5×10~-5 to 1×10~-3 mol/L of PAP. While in the 0.5 mol/L H_2SO_4 solution with 0.1 mol/L Cl-,the values of ka, kd are 66 mol/L s~-1 and 1.8×10~-3 s-1, respectively, f<0 when CPAP=2×~-5 mol/L, but the ka, kd equal to 1.2×10~-2 mol/L s~-1, 4.9×10~-4 s~-1, and f>0 when CPAP=1×10~-3 mol/L. Otherwhere, authors proved that the PAP occurred electrostatic adsorption under former condition, and it is chemisorbed on the iron surface under latter condition.

参考文献

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