海藻酸钙包覆纳米铁类芬顿降解亚甲基蓝

Degradation of Methylene Blue in Fenton-Like Systems Using Iron Nanoparticles Coated with Calcium Alginate

以海藻酸钙(CA)、绿茶提取液为原料,绿色合成海藻酸钙-铁复合微球(GT-Fe NPs@CA),作为类芬顿反应催化剂降解水中亚甲基蓝(MB)。通过SEM/EDS、FT-IR等方法对材料微观结构进行表征和分析。研究催化剂活化H_(2)O_(2)降解MB的影响因素及其反应动力学。结果表明,在pH 3.0~11.0的范围内,GT-Fe NPs@CA/H_(2)O_(2)对MB去除效果稳定,铁浸出量低。本研究的最佳去除条件是pH为3.0,催化剂投加量5.0 g/L,H_(2)O_(2)用量10 mmol/L,反应240min后,MB去除率可达99%。反应符合准二级动力学模型(R^(2)=0.999),包括复合材料的吸附作用和其作为催化剂诱发的类芬顿氧化作用。

GT-Fe NPs@CA was synthesized using CA and green tee extract in the study,and were used to degrade methylene blue (MB) in aqueous phase as a Fenton-like catalyst.The characteristics of the composites were characterized by SEM,EDS and FTIR,and the influencing factors,thermodynamics and kinetics of the reaction were investigated systematically.The results indicated that GT-Fe NPs@CA/H_(2)O_(2) was effective in MB removal in a wide range of pH from 3.0 to 11.0,with the low leaching rate of iron.After 240 min,the highest removal efficiency (99%) of MB (100mg·L^(-1)) was achieved at the optimal conditions (pH=3.0,GT-Fe NPs@CA=5.0 g/L,H_(2)O_(2)=10 mmol/L).The kinetics study demonstrates that this removal process conforms to the pseudo second-order model (R^(2)=0.999).The degradation of MB is the adsorption and redox reaction of Fenton-like.