纳米氧化镁的制备及降解性能

以六水氯化镁和氨水为主要原料制备纳米氧化镁，通过正交试验考察了Mg²⁺浓度、分散剂PEG-400用量、反应温度、陈化时间和缓冲剂冰醋酸的用量5个因素对晶粒粒径的影响，确定了纳米氧化镁的最佳工艺参数：缓冲剂冰醋酸用量为0.015 mol，Mg²⁺浓度为0.4 mol/L， 分散剂用量为5 mL，反应温度为60 ℃，反应时间为0 h，煅烧温度为550 ℃，煅烧时间为2 h。分析了单因素对纳米氧化镁晶粒的影响。选用对氧磷测试纳米氧化镁的吸附降解性，1 μL的对氧磷在5 min内被0.4 g氧化镁降解吸附了99.19%。1 g纳米氧化镁可降解吸附对氧磷194.9 mg。

Preparation and degradation properties of nano-sized magnesium oxide

Nano-sized magnesium oxide was prepared with MgCl₂·6H₂O and NH₃·H₂O as main raw materials.Influences of five factors，such as Mg^{2 +} concentration，PEG-400 dispersant dosage，reaction temperature，aging time，and buffering agent（glacial acetic acid） dosage，on crystalline size were investigated by orthogonal test.Optimum preparation parameters were determined as follows：buffering agent dosage was 0.015 mol，Mg^{2 +} concentration was 0.4 mol/L，PEG-400 dosage was 5 mL，reaction temperature was 60 ℃，reaction time was 0 h，calcination temperature was 550 ℃，and calcination time was 2 h.Effects of single factor on the crystalline size were analyzed.Mimic paraoxon was selected to test the absorption and degradation of nano-sized MgO.Results showed that the absorption and degradation of 0.4 g nano-MgO to 1μL paraoxon reached 99.19% within 5 min.1 g nano-MgO could degrade and adsorb 194.9 mg paraoxon.