(中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083)
摘 要: 利用漸近法計(jì)算并得到在臭氧氧化體系下CoOOH在水溶液中的準(zhǔn)溶解平衡常數(shù)，并通過換算得到在臭氧氧化體系下溶液中鈷離子濃度溶解平衡與pH值的關(guān)系。采用同步熱分析儀(DSC-TGA)測定CoOOH粉末加熱并分解得到Co3O4時(shí)在常溫到516 K溫度范圍內(nèi)的恒壓熱流，并得到在恒壓條件下加熱過程的DSC曲線。利用三線法得到CoOOH的摩爾定壓熱容，并且擬合CoOOH粉末的摩爾定壓熱容與溫度的函數(shù)關(guān)系式；利用相關(guān)物質(zhì)的已知熱力學(xué)參數(shù)，設(shè)計(jì)熱力學(xué)循環(huán)，計(jì)算在標(biāo)準(zhǔn)壓強(qiáng)和298.15 K時(shí)CoOOH粉末的標(biāo)準(zhǔn)生成熱力學(xué)函數(shù)。
關(guān)鍵字: CoOOH；臭氧；溶解平衡；熱容；標(biāo)準(zhǔn)熱力學(xué)函數(shù)
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:The pseudo solubility-product constant of CoOOH was detected by the asymptotic method, and then the relationship between precipitation-dissolution equilibrium of cobalt and pH value was calculated in the acid-oxidation system of ozone. The DSC curve and heat flow of CoOOH powders were detected by DSC-TGA in the range of room temperature to 516 K, where the CoOOH decomposed. The molar heat capacity of CoOOH powders was calculated by three-line method and the fitting function of molar heat capacity at constant pressure and temperature was obtained. The thermodynamic cycle was designed based on the known thermodynamic data, the standard thermodynamic functions of CoOOH under slandard pressure at temperature of 298.15 K were calculated.
Key words: CoOOH; ozone; precipitation-dissolution equilibrium; heat capacity; standard thermodynamic function
