研究报告
金晓英,陈征贤,郭飞鹏,陈祖亮.超声波辅助壳聚糖/零价纳米铁降解酸性品红[J].环境科学学报,2013,33(4):1004-1009
超声波辅助壳聚糖/零价纳米铁降解酸性品红
- Decoloration of acid fuchsine from aqueous solution by chitosan-stabilized nanoscale zero-valent iron under assistance of ultrasound
- 基金项目：国家自然科学基金(No.20775013)
- 作者
- 单位
- 金晓英
- 福建师范大学环境科学与工程学院,福州 350007
- 陈征贤
- 福建师范大学环境科学与工程学院,福州 350007
- 郭飞鹏
- 福建师范大学环境科学与工程学院,福州 350007
- 陈祖亮
- 福建师范大学环境科学与工程学院,福州 350007
- 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65 d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0.4 g·L-1、溶液pH=4.96、酸性品红初始浓度100 mg·L-1的条件下,反应20 min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55.34 kJ·mol-1,说明降解过程是化学控制过程.
- Abstract：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.
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