化学通报（网络版）
化學通報（網絡版）
화학통보（망락판）
Chemistry Online
2004年
1期
,共1页
流动注射分光光度法%吸附%离子强度%温度%活性炭%阴离子染料
流動註射分光光度法%吸附%離子彊度%溫度%活性炭%陰離子染料
류동주사분광광도법%흡부%리자강도%온도%활성탄%음리자염료
Flow injection-spectrophotometry%Adsorption%Ionic strength%Temperature%Activated carbon%Anionic dye
运用流动注射分光光度法,考察了在不同离子强度介质(NaCl)与温度下,水溶液中表面带负电的活性炭吸附阴离子染料酸性铬蓝K的行为.结果表明,离子强度的增大降低了吸附的活化能,在动力学上起到加速吸附的作用;在热力学上,各个温度下的吸附自由能变化均随着离子强度的增大而从正值转变为负值,吸附焓变与吸附熵变皆为正值并随着离子强度的增大而增大.结合这些动力学与热力学参数,初步解释了离子强度与温度对吸附的影响.
運用流動註射分光光度法,攷察瞭在不同離子彊度介質(NaCl)與溫度下,水溶液中錶麵帶負電的活性炭吸附陰離子染料痠性鉻藍K的行為.結果錶明,離子彊度的增大降低瞭吸附的活化能,在動力學上起到加速吸附的作用;在熱力學上,各箇溫度下的吸附自由能變化均隨著離子彊度的增大而從正值轉變為負值,吸附焓變與吸附熵變皆為正值併隨著離子彊度的增大而增大.結閤這些動力學與熱力學參數,初步解釋瞭離子彊度與溫度對吸附的影響.
운용류동주사분광광도법,고찰료재불동리자강도개질(NaCl)여온도하,수용액중표면대부전적활성탄흡부음리자염료산성락람K적행위.결과표명,리자강도적증대강저료흡부적활화능,재동역학상기도가속흡부적작용;재열역학상,각개온도하적흡부자유능변화균수착리자강도적증대이종정치전변위부치,흡부함변여흡부적변개위정치병수착리자강도적증대이증대.결합저사동역학여열역학삼수,초보해석료리자강도여온도대흡부적영향.
The effects of ionic strength of NaCl and temperature on the adsorption behavior of anionic dye (Acid chrome blue K) on activated carbon which presents a negative surface charge in aqueous solution were studied by flow injection-spectrophotometry. The results show that the rise of ionic strength increases the rate of dye adsorption through reducing adsorption activation energy, moreover, thermodynamically, the change in free energy of adsorption decreases from positive to negative with increasing ionic strength at each temperature investigated, but the changes in enthalpy and entropy of adsorption are positive and both increase with the incseasig ionic strength. On the other hand, the mechanisms of the effects of ionic strength and temperature were discussed in adsorption kinetic and thermodynamic aspects.
