(中南大學(xué) 化學(xué)化工學(xué)院，長(zhǎng)沙 410083)
摘 要: 合成了一種新型的三唑硫酮類表面活性劑—3-己基-4-氨基-1,2,4-三唑-5-硫酮(HATT)，通過(guò)紅外光譜和核磁共振氫譜及磁譜對(duì)其結(jié)構(gòu)進(jìn)行了表征，研究其在黃銅礦表面的吸附動(dòng)力學(xué)和熱力學(xué)。結(jié)果表明：黃銅礦吸附HATT優(yōu)選的pH值為4~8，吸附量隨著溫度的升高而增大；吸附過(guò)程符合準(zhǔn)二級(jí)動(dòng)力學(xué)方程，吸附活化能為13.06 kJ/mol；HATT在黃銅礦表面的吸附等溫線符合Langmuir模型，吸附焓變?chǔ)為71.52 kJ/mol，熵變?chǔ)為348.7 J/(mol·K)，吸附自由能變?chǔ)為-28.95 kJ/mol(298K)。HATT可能以單分子層化學(xué)吸附于黃銅礦表面，吸附為自發(fā)的吸熱過(guò)程。FTIR光譜分析進(jìn)一步證實(shí)HATT以化學(xué)方式吸附在黃銅礦的表面。浮選試驗(yàn)結(jié)果也表明，HATT是黃銅礦的優(yōu)良捕收劑。
關(guān)鍵字: 3-己基-4-氨基-1,2,4-三唑-5-硫酮；黃銅礦；熱力學(xué)；動(dòng)力學(xué); 吸附
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:A novel surfactant, 3-hexyl-4-amino-1,2,4-triazole-5-thione (HATT) was synthesized and characterized by infrared spectroscopy, 1HNMR and 13CNMR. And its adsorption kinetics and thermodynamics on the chalcopyrite surface were evaluated. The results indicate that the preferable pH values for HATT adsorption on chalcopyrite surface are 4-8 and the adsorption amount increases with increasing temperature. The adsorption process conforms to the pseudo-second-order kinetics equation and the adsorption activation energy is 13.06 kJ/mol. The adsorption isotherm agrees well with Langmuir model and the thermodynamics parameters ΔH, ΔS and ΔG are 71.52 kJ/mol, 348.7 J/(mol·K) and -28.95 kJ/mol (298K), respectively. The adsorption of HATT on the chalcopyrite surface is a spontaneous endothermic monolayer chemisorption. The FTIR spectra further verify the chemisorption process. The flotation results also show that HATT is a superior collector for chalcopyrite.
Key words: 3-hexyl-4-amino-1,2,4-triazole-5-thione; chalcopyrite; thermodynamics; kinetics; adsorption
