中文摘要：

用液相还原法制备的壳聚糖/零价纳米铁处理废水中染料——酸性品红,并利用扫描电子显微镜（SEM）、X射线衍射（XRD）、红外光谱（FTIR）和紫外可见光谱（UV-vis）等不同表征手段对颗粒物进行晶体结构、形貌与尺寸表征分析.结果发现,壳聚糖可与纳米铁形成稳定的包裹体,从而降低了纳米铁的团聚性并提高了纳米铁的反应性能及抗氧化性.在超声波辅助下,发现壳聚糖稳定纳米铁粒子对酸性品红有降解作用,置于空气中65d后壳聚糖稳定纳米铁仍具有反应活性.在25℃、壳聚糖稳定纳米铁投加量0.4g·L^-1、溶液pH=4.96、酸性品红初始浓度100mg·L^-1的条件下,反应20min内对酸性品红的脱色率超过99%,其降解过程符合表观一级反应动力学规律,反应的活化能为55.34kJ·mol^-1,说明降解过程是化学控制过程.

英文摘要：

Nanoscale zero-valent iron （nZVI） immobilized on chitosan （CS-nZVI） was synthesized and successfully used for degradation of acid fuchsine. X-ray diffraction （XRD）, scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy （FTIR） and ultra violet visible spectroscopy （UV-vis） were employed for characterization of the morphology and size of CS-nZVI to understand the degradation mechanism. It was revealed that nZVI and chitosan polymers were arranged in a homocentric layered structure to prevent the aggregation of nZVI, and hence, increasing their reactivity and anti-oxidation performance. After being exposed in the air for more than 65 days, CS-nZVI still showed high stability and reactivity. With the assistance of ultrasound, 99% acid fuchsine （AF） was removed from aqueous solution under the optimal condition, which was with an initial AF concentration of 100 mg·L^-1, pH 4.96, and temperature of 25 ℃ using 0.4 g·L^-1 CS-nZVI after reacting for 20 min. Degradation kinetics fitted well to pseudo first-order model. The apparent activation energy was 55.34 kJ·mol^-1, indicating a chemically controlled reaction.