内电解-混凝沉淀技术对合成制药废水的预处理研究-环境工程学报.doc

拟再审修改稿 稿件编号：201301069 用于磷吸附的载铁（β-FeOOH）沸石制备及特性研究 张多，张盼月*，田帅，马博强 （北京林业大学环境科学与工程学院，北京 100083） 摘 要 以天然沸石为载体，采用FeCl3水解法制备用于磷吸附的载铁沸石（β-FeOOH-Z），优化β-FeOOH-Z的制备条件，包括FeCl3溶液浓度、负载pH值、负载时间、负载温度和烘干温度，并利用X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）对β-FeOOH-Z及其磷吸附特性进行分析。结果表明，β-FeOOH-Z的优化制备条件为：FeCl3溶液浓度1mol/L、负载pH值6、负载时间24h、负载温度25℃和烘干温度60℃。优化制备条件下，100-120目沸石的载铁量为100.2mg/g，铁的负载率为18%，其磷吸附量为7.68mg/g，比天然沸石提高79.6%。XRD分析结果表明β-FeOOH-Z中的杂质元素较天然沸石减少，并有效负载β-FeOOH；制备条件对β-FeOOH-Z的成分有较大影响，FeCl3溶液浓度较低、负载温度和烘干温度过高均使β-FeOOH-Z中含有α-Fe2O3，并导致其磷吸附效率降低。FTIR分析结果表明β-FeOOH-Z的表面羟基在其吸附磷过程中起重要作用，羟基与磷酸根离子的配位交换是β-FeOOH-Z吸附磷的主要作用机制。 关键词 天然沸石 β-FeOOH XRD FTIR 磷吸附 表面羟基 中图分类号：X703 Preparation of β-FeOOH loaded-zeolite and its characteristics for phosphorus adsorption Zhang Duo, Zhang Panyue*, Tian Shuai, Ma Boqiang (College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China) Abstract Zeolite loaded with β-FeOOH (β-FeOOH-Z) was prepared by hydrolysis of FeCl3 and coating on natural zeolite. Preparation conditions including FeCl3 concentration, pH, reaction time, reaction temperature and drying temperature were optimized. In addition, the β-FeOOH-Z was characterized with X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The results showed that the optimal preparation conditions were: FeCl3 concentration of 1mol/L, pH of 6, reaction time of 24h, reaction temperature of 25℃ and drying temperature of 60℃. Under the optimal preparation conditions, the obtained β-FeOOH-Z has particle size of 100-120 mesh, iron load amount of 100.2mg/g and iron load ratio of 18%. Its adsorption capacity for phosphorus was 7.68mg/g, which increased by 79.6% compared with that of the natural zeolite. XRD analysis showed that content of impurity elements in the β-FeOOH-Z was lower than that in natural zeolite, and the β-FeOOH was effectively loaded on the natural zeolite. The composition of β-FeOOH-Z was greatly influenced by the preparation conditions, and low FeCl3 concentration,