微纳米气泡耦合过渡金属离子催化氧化吸收甲醛

利用过渡金属离子Fe^2+和Mn^2+作为催化剂,耦合微纳米气泡催化氧化吸收HCHO,研究了各种反应参数变化对吸收效果的影响,并借助GC-MS技术探究了微纳米气泡氧化吸收HCHO的机理。实验结果表明:HCHO吸收率随着吸收液pH、NaCl浓度、SDS浓度及过渡金属离子浓度的增加均呈现出先升高后降低的变化规律,低浓度的NaCl有助于HCHO的吸收;在进气HCHO质量浓度0.4 mg/m^3、循环9次的设定工况下,最佳工艺条件为吸收液pH 4、NaCl质量浓度0.1 g/L、SDS质量浓度7 mg/L、Fe^2+/Mn^2+浓度2.0 mmol/L;在此条件下,Fe^2+和Mn^2+催化体系的HCHO吸收率分别达82.6%和90.4%。GC-MS分析结果显示,微纳米气泡氧化吸收HCHO的主要有机产物为乙二醇。

Absorption of formaldehyde by catalytic oxidation with micro-nano bubbles coupled transition metal ions

Transition metal ions Fe²⁺ and Mn²⁺ were used as catalysts and coupled with micro-nano bubbles to absorb HCHO by catalytic oxidation. The effects of various reaction parameters were studied,and the mechanism of HCHO absorption by micro-nano bubbles was explored by means of GC-MS technique. The experimental results show that：The HCHO absorption rate increased first and then decreased with the increase of pH,NaCl concentration,SDS concentration and transition metal ion concentration,and NaCl with lower concentration promotes the absorption;With the set conditions of intake HCHO mass concentration 0.4 mg/m³ and 9 cycles,the optimal process conditions are the absorption liquid pH 4,the NaCl mass concentration 0.1 g/L,the SDS mass concentration 7 mg/L,and the concentration of Fe²⁺/Mn²⁺ 2.0 mmol/L;Under these conditions,the HCHO absorption rates on Fe²⁺ and Mn²⁺ catalyst systems are 82.6% and 90.4%,respectively. The GC-MS analysis results show that the main organic product of oxidative absorption of HCHO by micro-nano bubbles is ethylene glycol.