Cu^(0)-Fe_(3)O_(4)@壳聚糖微球的制备及其对染料污染物的催化氧化

Preparation of Cu^(0)-Fe_(3)O_(4)@chitosan microspheres and its catalytic oxidation of dye contaminants

采用Fe^(2+)以及Cu^(2+)与壳聚糖形成的双金属络合物作为前驱体溶液,一步成球后通过水热法制得Cu^(0)-Fe_(3)O_(4)@壳聚糖微球。表征结果证明,Cu^(0)以及Fe_(3)O_(4)均以纳米尺寸均匀镶嵌在壳聚糖微球中。当此壳聚糖微球投加量为0.5 g/L,H_(2)O_(2)投加量为40 mmol/L时,对初始浓度为20 mg/L的活性红73在60 min中内的脱色效率可达99%,且在pH 3.0~9.0范围内均能维持较高的效率。纳米Cu^(0)在有氧条件下表面易形成Cu2O层,不仅能够活化H_(2)O_(2)产生·OH,还可提供电子加快Fe(Ⅲ)/Fe(Ⅱ)之间的循环,使类芬顿反应高效进行。

Fe^(2+),Cu^(2+)and chitosan were used to form a bimetallic complex as precursor to prepare Cu^(0)-Fe_(3)O_(4)@chitosan microspheres catalyst in one step by hydrothermal method.The characterization results showed that both Cu^(0) and Fe_(3)O_(4) were uniformly embedded in chitosan microspheres.When the dosages of the catalysts and H_(2)O_(2) were 0.5 g/L and 40 mmol/L,respectively,99%of C.I.Acid Red 73 at the initial concentration of 20 mg/L could be removed in 60 min.The catalyst could maintain high efficiency in the pH range of 3.0-9.0.Cu_(2)O sphere can generate on the surface of Cu^(0) under aerobic condition,which not only activated H_(2)O_(2) to produce·OH,but also provided electrons to accelerate the cycle of Fe(Ⅲ)/Fe(Ⅱ),promoting the Fenton-like reactions.