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通过在不同的铂(Ⅳ)氯络离子初始浓度、温度、搅拌速率和pH下进行的实验,研究活性炭吸附铂(Ⅳ)氯络离子的动力学。结果表明,吸附过程的活化能为19.7 kJ/mol。等离子体质谱分析结果表明,Pt(Ⅳ)、Pt(Ⅱ)离子被活性炭吸附并进一步还原为金属铂,从而从溶液中分离出去。XPS分析结果证实在活性炭的表面存在3种形式的Pt,即Pt(0)、Pt(Ⅱ)和Pt(Ⅳ)。XPS光谱的特征吸收峰解析证实在溶液中存在不同氧化态的Pt。在活性炭的表面观察到球形岛状的金属Pt,其直径不超过500 nm。这些球形岛状铂由厚度为35 nm左右的片状粒子组成。
The kinetics of adsorption of platinum (IV) chloride ion on activated carbon was investigated by conducting experiments at different initial concentrations of platinum (IV) chloride ion, temperature, stirring rate and pH. The results show that the activation energy of the adsorption process is 19.7 kJ / mol. The results of plasma mass spectrometry showed that the Pt (Ⅳ) and Pt (Ⅱ) ions were adsorbed on the activated carbon and further reduced to metal platinum, thus being separated from the solution. XPS analysis confirmed that there are three forms of Pt on the surface of activated carbon, namely Pt (0), Pt (Ⅱ) and Pt (Ⅳ). Characteristic absorption peak resolution of XPS spectra confirmed the presence of Pt in different oxidation states in solution. Spherical island metal Pt was observed on the surface of activated carbon and its diameter did not exceed 500 nm. These spherical island-shaped platinum is composed of flaky particles with a thickness of about 35 nm.