以城市污泥为基质制备氧化石墨烯的响应面优化

RESPONSE SURFACE OPTIMIZATION OF GRAPHENE OXIDE PREPARATION USING MUNICIPAL SLUDGE AS THE SUBSTRATE

城市污泥中含有丰富的有机质,能够为氧化石墨烯的制备提供碳源。采用改进的Hummers法以城市污泥为基质制备氧化石墨烯(GO)。在单因素实验基础上,通过响应面法对碳粉用量、KMnO_(4)用量、H_(2)SO_(4)用量以及超声时间多因素影响下的GO制备条件进行优化,其最优制备条件为:碳粉用量3.22 g、KMnO_(4)用量4.12 g、H_(2)SO_(4)用量22.63 mL、超声时间7.61 h。扫描电镜和红外光谱分析表明,响应面优化条件下制备的GO具有明显的片层状结构,在3400,1400 cm^(-1)左右处为O—H(羟基)的特征峰,1700 cm^(-1)出现C O(羰基)的特征峰,1200 cm^(-1)左右出现C—O(环氧基)的特征峰,符合传统材料制备的GO特征。以城市污泥为基质成功制备出GO,为城市污泥的资源化利用提供了新的方向和理论基础。

Municipal sludge is rich in organic matter,which can provide carbon source for the preparation of graphene oxide(GO).In this paper,GO was prepared from municipal sludge by modified Hummers method.Response surface methodology(RSM)was used to optimize GO preparation conditions,including toner dosage,potassium permanganate dosage,concentrated sulfuric acid dosage,and ultrasonic time,based on single factor experiment.The optimized preparation conditions of GO-based on municipal sludge were carbon powder of 3.22 g,potassium permanganate of 4.12 g,concentrated sulfuric acid of 22.63 mL and ultrasonic time of 7.61 h.Scanning electron microscopy and infrared spectroscopy analysis showed that GO prepared under the optimum experimental conditions had obvious lamellar structure,with O—H(hydroxyl)characteristic peaks at about 3400 cm^(-1)and 1400 cm^(-1),C O(carbonyl)characteristic peaks at about 1700 cm^(-1),and C—O(epoxy)characteristic peaks at about 1200 cm^(-1).It was consistent with the properties of GO prepared with the traditional materials.Thus,a new direction and theoretical basis were provided for the utilization of municipal sludge by preparing GO.