CAJ | 학술논문

用水热法制备出γ- MnO2，研究其对苯酚的降解过程.用 X 射线衍射仪（XRD）和比表面积及孔径分布仪（BET）对γ- MnO2结构和比表面积进行测定.实验结果表明γ- MnO2能够有效地降解苯酚，同时γ- MnO2被还原为 Mn2+. pH 值、苯酚的初始浓度和γ- MnO2的投加量是影响降解苯酚的主要因素，对降解动力学速率有显著影响，研究反应最初20 min 的反应速率，pH 值、苯酚初始浓度和γ- MnO2投加量对应的反应级数分别为-3.1873、-0.4235和0.1734.降解热力学研究表明，反应活化能为5.301 kJ/ mol，指前因子为4.98 mM4.44·min -1.为更好地理解 MnO2降解水中有机污染物基本原理提供了大量的有用信息.
용수열법제비출γ- MnO2，연구기대분분적강해과정.용 X 사선연사의（XRD）화비표면적급공경분포의（BET）대γ- MnO2결구화비표면적진행측정.실험결과표명γ- MnO2능구유효지강해분분，동시γ- MnO2피환원위 Mn2+. pH 치、분분적초시농도화γ- MnO2적투가량시영향강해분분적주요인소，대강해동역학속솔유현저영향，연구반응최초20 min 적반응속솔，pH 치、분분초시농도화γ- MnO2투가량대응적반응급수분별위-3.1873、-0.4235화0.1734.강해열역학연구표명，반응활화능위5.301 kJ/ mol，지전인자위4.98 mM4.44·min -1.위경호지리해 MnO2강해수중유궤오염물기본원리제공료대량적유용신식.
γ - MnO2 was prepared with hydrothemal method to study the oxidative degradation of phenol at the interface of manganese oxides and water. The crystal structure and the specific surface area of γ - MnO2 were examined by X - ray diffraction(XRD)and Brunauer - Emmett - Teller(BET)methods. The experimental re-sult showed that γ - MnO2 could effectively degrade phenol. And in the meantime,it was found that γ - MnO2 could be reduced to Mn2 + . The initial 20 min kinetic reaction rate,pH value,initial phenol concentration and γ -MnO2 dosage were the main factors of influencing phenol degradation,and their reaction orders were respectively- 3. 187 3、- 0. 423 5 and 0. 173 4,respectively. The thermodynamics of phenol degradation by γ - MnO2 was also investigated,and the apparent activation energyexponential factor were estimated to be 5. 301 kJ/ mol and 4. 98 mM4. 44 ·min - 1 . This investigation will give some new insights for understanding the interaction of organic pollutants with manganese oxides.