B6价纳米铁处理活性艳蓝KN-R的动力学探讨.docVIP

包覆型纳米零价铁的制备及其去除水中活性艳蓝的研究 成岳，焦创，刘海江 （景德镇陶瓷学院材料学院，景德镇，333403；江西省先进陶瓷材料重点实验室，景德镇，333001） 摘要：采用流变相法，以FeSO4·7H2O：KBH4=1:2（摩尔比）为固相介质，0.06g/ml CMC（羧甲基纤维素）水溶液为液相介质，固液比1:2，反应2h制备出包覆型纳米零价铁；采用XRD、TEM等手段对合成的纳米零价铁进行表征。探讨不同反应条件对包覆型纳米铁去除活性艳蓝KN-R的影响。实验结果表明，初始活性艳蓝KN-R（浓度100mg/L）pH为5，包覆型纳米铁的投加量为6g/L，反应时间为30min时，活性艳蓝KN-R的去除率可达 96%。通过研究机理，其吸附过程符合二级吸附动力学，降解过程符合一级反应动力学。 关键词：流变相；纳米零价铁；CMC； 活性艳蓝KN-R Preparation of coated nanoscale zero-valent iron by using rheological phase reaction method and its application in removing KN-R from wastewater (Materials Science and Engineering of Jingdezhen Ceramic Institute, Jingdezhen，333403，China ; Key laboratory of Jiangxi Province for Advanced ceramic materials，Jingdezhen 333001，Jingdezhen，333001，China) Abstract: In this study, coated nanoscale zero-valent iron was prepared by using rheological phase reaction method. FeSO4·7H2O and KBH4 (molar ratio of 1:2) were used as solid-phase media, and 0.06 g/ml CMC solution as liquid medium. The ratio of solid/liquid was 1:2. Nanoscale zero-valent iron (ZVI) was prepared with a reaction time of 2 h. The nano-ZVI was characterized by using XRD, TEM, etc. The removal efficiency of dye KN-R by ZVI was evaluated under different reaction conditions．Experimental results showed that KN-R removal100 mg/L, pH of 5, the ZVI dose of 6 g/L, and a reaction time of 30 min. The adsorption kinetic followed pseudo-second-order model, and degradation followed first-order model. Key Words: rheological ZVI CMC reactive brilliant blue KN-R朗读  纳米铁颗粒因其粒径小，颗粒的比表面积和表面能大，从而具有优越的吸附性能和很高的还原活性。利用纳米颗粒特有的表面效应和小尺寸效应，可以提高零价铁颗粒的反应活性和处理效率[1-3]。近年来，将纳米零价铁用于环境污染的治理已成为一种备受关注的污染控制技术。但铁粒子比表面积大因而易团聚，表面能量高导致纳米铁粒子易被氧化等技术难题限制了它的应用[4-6]。流变相反应法热交换好，反应条件温和，是一种高效、节能、经济而绿色的化学反应[7,8]，因而被广泛应用于纳米材料的合成之中。利用流变相反应法制备包覆型纳米铁有效的降低了制备的复杂性及难度，同时很大程度的提高了其分散性和在空气中的稳定度。1实验部分 包覆型纳米零价铁的制备工艺 称取一定质量的 FeSO4·7H2O（分析纯， 上海试剂一厂）和KBH4（95%分析纯，上海精化科技研究所）（摩尔比为1:2）于研钵中研磨后作为固相介质，配制一定浓度的CMC（（羧甲基纤维素钠）化学纯，上饶县蓝天装饰材料厂）水溶液作为液相介质，然后将两者按照相应比例调配成流变相体系，体系反应为： Fe2++2BH4-+6H2O→Fe+2B(