磁性Cu(Ⅰ)@壳聚糖微球的一步法制备及其对染色废水的净化

One-step preparation of magnetic Cu(Ⅰ) @ Chitosan microsphere and its application for dye removal

选用壳聚糖-铜-铁络合物为前驱体,一步制备得到负载一价铜的磁性壳聚糖微球,其具备有效催化H_2O_2氧化染料污染物的能力,且使用后可快速通过外加磁场与水体分离。研究结果表明,磁性Cu(Ⅰ)@壳聚糖微球中的金属成分主要由Fe_3O_4及Cu_2O组成,微球表面及内部具有丰富的孔道结构,比表面积约为63. 2 m^2/g,投加量2. 0 g/L的Cu (Ⅰ)@壳聚糖微球在60 min内催化H_2O_2促进其中的类Fenton反应降解染料,可使100 mL浓度为20 mg/L的酸性红73脱色率达99%以上。Cu(Ⅰ)@壳聚糖微球的高效催化作用主要缘于Cu_2O组分,其一方面能够分解H_2O_2产生强氧化性物质,一方面还能够促进铁(Ⅱ)与铁(Ⅲ)之间的循环,与Fe_3O_4起到协同催化氧化污染物的作用。

Magnetic Cu(Ⅰ)@ chitosan microsphere was prepared in one-step by using chitosan-Cu-Fe as complex precursor. It can active H2O2 to produce active species such as hydroxyl radicals,which can degrade dye pollutants efficiently. The analytical results show that magnetic Cu(Ⅰ)@ chitosan microsphere is composed of Fe3O4 and Cu2O. The BET surface area of this catalyst is about 63. 2 m^2/g and it also contains abundant pore channels. More than 99% of C. I. Acid Red 73( 20 mg/L,100 m L) can be removed by adding 2. 0 g/L of magnetic Cu(Ⅰ)@ chitosan microsphere in wastewater.Compared with the traditional Fenton catalyst,the Cu( I) component in catalyst plays an important role,which not only can activate H2O2 to produce active species such as hydroxyl radicals,but also can promote the cycle of Fe(Ⅲ) to Fe(Ⅱ).