摘要
测定了20,30,40℃条件下活性炭从硫脲原始溶液吸附金的等温线,应用气相吸附的Langmuir方程和Clausius-Clapeyron方程分别计算了饱和吸附量和吸附热。结果表明:(1)在20,30,40℃金的饱和吸附量分别是6.00,9.17,15.4mmol/g,随温度升高而增加;(2)吸附热随活性炭覆盖率增加呈对数关系下降,起始微分吸附热和积分吸附热分别为-9.82和-9.61kJ/mol;(3)被吸附的络离子主要是Au[CS(NH_2_2]^+和Au[CS(NH_2)_2]_2^+,本体系具有化学吸附的性质。
The adsorption isotherms of gold from natural thiourea solution by activated car-
bon were determined at 20, 30and40℃. Saturated adsorption amount and adsorbed heat
were calculated by Langmuir equation and Clausius-Clapeyron equation of the gas
phase adsorption respectively. The results indicated:(1) Saturated adsorption amount of
gold, which is 6.00, 9.17and15.4 mmol / g at 20,30 and 40℃ respectively, is incremental
with the rise if the temperature;(2) Adsorbed heat is descending according to the loga-
rithm relation as the increase of the surface coverage of activated carbon, original
differential adsorbed heat and integral adsorbed heat are -9.82 and -9.61 kJ/mol
respectively; (3) The complex ions adsorbed are mainly Au[CS(NH_2)_2]^+ and
Au[CS(NH_2)_2]_2^+, and this system possesses chemical adsorption property.
基金
冶金部教育司基础理论研究资助课题一部分
关键词
硫脲
金
活性炭
吸附等温线
thiourea
gold / activated carbon
adsorption isotherm
