合成锰氧化物氧化水中苯酚的研究

Oxidative degradation of phenol in water by synthesized manganese oxide

在实验室条件下制备出了合成锰氧化物(结构类似于δ-MnO2),研究了锰氧化物对水中微量苯酚的氧化效果,并对影响因素进行了分析.实验结果表明:合成锰氧化物对水中微量苯酚具有很好的氧化能力.在pH=3,合成锰氧化物投加量为10mg,反应720min时,合成锰氧化物对200mL质量浓度为5mg/L的苯酚去除率达到86.8%,随着pH值的升高,合成锰氧化物对苯酚的氧化能力逐渐降低,在pH=3时最大;一定范围内,随着合成锰氧化物投加量的增加以及苯酚初始浓度的增加,苯酚的氧化去除率也随之增加;合成锰氧化物对苯酚的氧化受环境中金属离子的抑制作用,其中,Na+、Ca2+、Mg2+离子的抑制效果较弱,而Pb2+、Mn2+等离子抑制作用较强,具体抑制效果为:Na+<Ca2+≈Mg2+<Zn2+<Cu2+<Ba2+<Mn2+<Pb2+.

In order to study the effect of manganese oxide degradation of trace phenol,a kind of manganese oxide called acidicδ-MnO2 is synthesized in the laboratory,as is used in phenol degradation experiments and its impact factors is studied.The experimental results show that：synthesized manganese oxide degradation of trace phenol experiments proves good degradation effect.In pH=3,synthesized manganese oxide dosage is 10 mg,the reaction 720 min,for 200 mL concentration of 5mg/L of phenol solution removal reaches 86.8%.With the increase of pH,acidic synthesized manganese oxide degradation of phenol decreases.When the value of pH is 3,the degradation achieves maximum.Within a certain range it increases with increasing acidity synthesized manganese oxide dosage initial phenol concentration,the oxidation of phenol removal rate also increases;acidic synthesized manganese oxide oxidizing environment of phenol inhibition different metal ions,among which,the inhibitory of sodium,calcium and magnesium ions is weak,but strong inhibition of manganese ions,specific inhibitory of Na＋〈Ca2＋≈Mg2＋〈Zn2＋〈Cu2＋〈Mn2＋〈Pb2＋.