由脲醛树脂制备炭材料及其对金属离子的吸附性能

Synthesis of Carbon Material from Ureaformaldehyde Resin and Its Adsorption to Heavy Metal Ions

以脲醛树脂为前躯体,在氮气气氛中炭化获得炭吸附材料ACUF,对其结构、表面性质及形貌进行了分析,采用静态法考察了700℃下炭化所得材料ACUF700对不同金属离子的吸附性能.结果表明,ACUF保留了大量的胺基活性基团,并具有发达的微孔结构.ACUF700的比表面积达702.3 m2/g,平均孔径为2.044 nm,对Pb2+,Cu2+,Fe3+和La3+均有良好的吸附性能,吸附容量分别达39.7,37.0,13.0和10.5 mg/g;并具有良好的再生性和重复使用性,循环使用5次后吸附容量变化很小.吸附过程符合准二级动力学方程,可用Langmuir吸附等温方程描述.

A novel adsorption carbon material ACUF was prepared using ureaformaldehye resin as the precursor carbonized in nitrogen atmosphere, its structure, morphology and surface properties were characterized, the adsorption properties of ACUF700 carbonized at 700℃ to metal ions were studied by a static method. The results show that ACUF retains a large number of active amine groups and has a developed microporous structure. The specific surface area of ACUF700 is 702.3 m2/g and pore size 2.044 nm, it has good adsorption property to Pb2＋, Cu2＋, Fe3＋ and La3＋, and the adsorption capacity reaches 39.7, 37.0, 13.0, and 10.5 mg/g, respectively. It is regenerated easily and possesses better reusability, and its recycled adsorption capacity has changed little after 5 times. The dynamics equation conforms to pseudo-second order model, and adsorption behavior can be described by Langmuir adsorption isotherm equation.