碳酸盐缓冲溶液性质对栲胶脱硫的影响

研究了Na2CO3-NaHCO3缓冲液的pH值和总碱度对HS-与V5+氧化还原反应的影响,以及Na2CO3-NaHCO3缓冲液的性质。研究表明,缓冲液的pH值越高,HS-的转化率越低,缓冲液的总碱度对HS-的转化率影响不大。缓冲液的pH值随Na2CO3质量浓度的增加而变大,随NaHCO3质量浓度增加而降低;缓冲溶液的缓冲能力随溶液中Na2CO3和NaHCO3的质量浓度增加而增加;缓冲溶液的最佳浓度值为:Na2CO3质量浓度5.0 g/L,NaHCO3质量浓度30.0 g/L。 The effect of pH value and total alkalinity of Na2CO3-NaHCO3 buffer solution on the reaction between HS-and V5+ and the properties of the Na2CO3-NaHCO3 buffer solution are studied.The results show that the conversion and reaction rates of HS-decrease with increase of the pH value of the buffer solution.The total alkalinity of the Na2CO3-NaHCO3 buffer solution has barely effect on the conversion of HS-,but the larger the total alkalinity of the buffer solution is,the stronger the buffer capacity is.In addition,when the concentration of Na2CO3 increase or the concentration of NaHCO3 decrease,the pH value of the buffer solution increase gradually.The buffer capacity of the buffer solution enhance with increase of the concentration of Na2CO3 and NaHCO3.The proper combination is that the concentration of Na2CO3 is 5.0 g/L,while the NaHCO3 is 30.0 g/L