Fu Jun, Fan Fang, Li Hai-Ning, Zhang Gao-Sheng
Sino-Japan Friendship Center for Environmental Protection, Beijing 100029, China.
Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
Huan Jing Ke Xue. 2016 Dec 8;37(12):4882-4890. doi: 10.13227/j.hjkx.201608168.
Fe-Mn binary oxide impregnated chitosan bead (FMCB), an environmental friendly sorbent for phosphate removal, was fabricated through impregnating Fe-Mn binary oxide into chitosan matrix. The FMCB was characterized by SEM and BET surface area measurement. The adsorption behavior of phosphate on the FMCB was systemically investigated. The FMCB showed a porous and fibrous structure, with a high BET specific surface area of 248 m·g and a pore volume of 0.37 m·g. It had a much higher phosphate adsorption capacity than pure chitosan bead. Langmuir model was more suitable for describing the adsorption behavior and the maximal adsorption capacity was as high as 13.3 mg·g at pH 7.0.The kinetic data were well fitted by the pseudo second order model. The phosphate adsorption on FMCB was pH-dependent and decreased with increasing solution pH. Coexisting Ca and Mg enhanced slightly the adsorption of phosphate, while the coexisting anions hindered the phosphate adsorption in the order of SiO > CO > SO≥Cl. The phosphate-loaded FMCB could be effectively regenerated using NaOH solution and repeatedly used. In column tests, about 800 bed volumes of simulated groundwater containing 3 mg·L were treated before breakthrough (phosphate concentration in effluent reached 0.5 mg·L).
通过将铁锰二元氧化物浸渍到壳聚糖基质中，制备了用于去除磷酸盐的环保吸附剂——铁锰二元氧化物浸渍壳聚糖珠（FMCB）。采用扫描电子显微镜（SEM）和比表面积分析仪（BET）对FMCB进行了表征。系统研究了FMCB对磷酸盐的吸附行为。FMCB呈现出多孔纤维结构，BET比表面积高达248 m²·g，孔容为0.37 m³·g。其对磷酸盐的吸附能力远高于纯壳聚糖珠。Langmuir模型更适合描述该吸附行为，在pH为7.0时最大吸附量高达13.3 mg·g。动力学数据能很好地拟合准二级模型。FMCB对磷酸盐的吸附受pH影响，随溶液pH升高而降低。共存的Ca和Mg对磷酸盐吸附有轻微促进作用，而共存阴离子对磷酸盐吸附的阻碍作用顺序为SiO₃²⁻＞CO₃²⁻＞SO₄²⁻≥Cl⁻。负载磷酸盐的FMCB可用NaOH溶液有效再生并重复使用。在柱试验中，在穿透（流出物中磷酸盐浓度达到0.5 mg·L）前可处理约800床体积含3 mg·L磷酸盐的模拟地下水。
