铜配合物催化双氧水氧化木质素磺酸钠的研究

Study on Oxidation of Sodium Lignosulfonate with Hydrogen Peroxide Catalyzed by Copper Complex

木质素是一种结构复杂的天然高分子聚合物,较难被分离和降解。本文通过构建新型的铜配合物催化体系来研究其催化双氧水氧化降解木质素磺酸钠的性能及催化机理,具体研究了pH值、催化剂浓度、双氧水质量浓度、温度等因素对氧化降解效果的影响,结果表明,在80℃下该催化体系能够有效地氧化降解木质素磺酸钠。同时也通过多种表征手段研究了该催化体系的反应机理,结果证实了高价铜-氧活性种的存在,推测Cu(III)=O·反应体系主要的活性中心。

Lignin is a natural high-molecular polymer with complex structures,and is difficult to separate and degrade.In this study,a new copper complex catalytic system was constructed to study its performance and mechanism of catalyzing oxidation of sodium lignosulfonate with hydrogen peroxide.Specifically,the impact of the following factors on the result of oxidation and degradation was covered,including pH value,catalyst mass concentration,hydrogen peroxide mass concentration and temperature.The results show that the catalytic system can effectively oxidize and degrade sodium lignosulfonate at 80℃.At the same time,the reaction mechanism of the catalytic system was studied with multiple characterization methods,and the results verified the existence of high-valent copper-oxygen active species.It was speculated that Cu(Ⅲ)=O·was the main active species of the reaction system.