Abstract:

MoS₂@Fe₃O₄ composite was fabricated via two-step hydrothermal method, utilizing cetyltrimethyl ammonium bromide(CTAB) as a soft template, thioacetamide as a sulfur source, and sodium molybdate as a molybdenum source. The morphology and structure of MoS₂@Fe₃O₄ were analyzed by SEM and XRD. The efficiency and mechanism of catalytic degradation of iodoprolol(IPM) by MoS₂@Fe₃O₄/H₂O₂ system was evaluated. The results showed that Fe₃O₄ was deposited on the surface of MoS₂, and MoS₂@Fe₃O₄ had a uniformly dispersed flower ball structure, which provided more catalytic active sites. Under the conditions of initial pH of 4, MoS₂@Fe₃O₄ dosage of 0.15 g/L, H₂O₂ concentration of 0.5 mmol/L, and IPM concentration of 5 μmol/L, the degradation rate of IPM by MoS₂@Fe₃O₄/H₂O₂ system reached 89.85% after 30 minutes of reaction. Compared with Fe₃O₄/H₂O₂ system, the degradation rate of IPM increased by about 12%. The applied magnetic field facilitated the reusability of MoS₂@Fe₃O₄. The main active species for IPM degradation by the MoS₂@Fe₃O₄/H₂O₂ system were ·OH and ¹O₂. The degradation rate of the MoS₂@Fe₃O₄/H₂O₂ system on IPM remained stable over 80% after 6 cycles, suggesting that MoS₂@Fe₃O₄ had good stability.

Key words: heterogeneous Fenton reaction, MoS₂, Fe₃O₄, iodoprolol

摘要：

以十六烷基三甲基溴化铵（CTAB）为软模板，以硫代乙酰胺为硫源、钼酸钠为钼源，采用水热两步法制备了MoS₂@Fe₃O₄复合材料。采用SEM、XRD等对MoS₂@Fe₃O₄的形态结构进行了表征分析，考察了MoS₂@Fe₃O₄/H₂O₂体系催化降解碘帕醇（IPM）的效能和作用机理。结果显示，Fe₃O₄成功负载在MoS₂表面，且MoS₂@Fe₃O₄呈均匀分散的花球状结构，提供了更多催化活性位点。在溶液初始pH为4，MoS₂@Fe₃O₄投加量为0.15 g/L，H₂O₂浓度为0.5 mmol/L，IPM浓度为5 μmol/L条件下，反应30 min后MoS₂@Fe₃O₄/H₂O₂体系对IPM的降解率达到89.85%，与Fe₃O₄/H₂O₂体系相比，对IPM的降解率提高约12%。MoS₂@Fe₃O₄/H₂O₂体系降解IPM的主要活性物种为·OH和¹O₂。利用外加磁场能够实现MoS₂@Fe₃O₄催化剂的循环再利用，6次循环使用后，反应30 min时MoS₂@Fe₃O₄/H₂O₂体系对IPM的降解率仍在80%以上，表明MoS₂@Fe₃O₄在反应过程中具有良好的稳定性。

关键词: 非均相Fenton, 二硫化钼, 四氧化三铁, 碘帕醇

CLC Number: 

• X52

• O643.36