【摘要】 用羧甲基纤维素钠和硫酸铜溶液制备出不溶性的羧甲基纤维素铜(Ⅱ)材料,以含16×10-6噻吩和96×10-6正戊硫醇的石油醚为模型样,研究了该材料对硫醇的脱除效果。结果表明,羧甲基纤维素铜(Ⅱ)在室温下以24.0 h-1空速可以将模型样品中的硫醇完全脱除,模型样品的脱除容量达到925 mL/g,脱硫醇容量1.86 mmol/g。利用XPS研究材料使用前后铜离子价态的变化,发现材料中的正二价铜离子转变成正一价,通过GC-MS分析脱硫醇后的模型样品硫醇的变化,确认硫醇被氧化生成二硫化物,从而证实了羧甲基纤维素铜(Ⅱ)材料脱硫醇是一个氧化-还原过程。更多还原

【Abstract】 Copper(II) carboxymethylcellulose was prepared with sodium carboxymethylcellulose and copper sulphate in aqueous solution.Sweetening properties of copper(II) carboxymethylcellulose in liquid hydrocarbon was studied using petroleum ether containing 96×10-6 n-pentanethiol and 16×10-6 thiophene as a model solution.Mercaptan in the model solution could be cleaned out at 24.0 h-1 space velocity at room temperature.Sweeten capacity of copper(II) carboxymethylcellulose is 925 mL/g for the model solution or 1.86 mmol/g for mercaptan.Copper(I) that reduced from copper(II) was found in saturated cuprum carboxymethylcellulose material by XPS.Dipentyl disulfide,the oxidation product of n-pentanethiol,was detected in the model solution after sweetening by GC-PFPD.The sweetening mechanism of copper(II) carboxymethylcellulose was confirmed as an oxidation-reduction process.更多还原