引用本文:胡小莲,杨林章,何世颖,冯彦房,周玉玲,等.Fe3O4/BC复合材料的制备及其吸附除磷性能[J].环境科学研究,2018,31(1):143-153.
HU Xiaolian,YANG Linzhang,HE Shiying,FENG Yanfang,ZHOU Yuling,et al.Preparation of Fe3O4/BC Composite and Its Application for Phosphate Adsorptive Removal[J].Reserrch of Environmental Science,2018,31(1):143-153.]
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Fe3O4/BC复合材料的制备及其吸附除磷性能
胡小莲1,2, 杨林章1,2, 何世颖1,2, 冯彦房1,2, 周玉玲1
1. 江苏省农业科学院农业资源与环境研究所, 江苏 南京 210014;2. 江苏滩涂生物农业协同创新中心, 江苏 盐城 224002
摘要:
为解决磁性吸附剂Fe3O4不稳定、易在水中团聚以及吸附效率较低的问题,以BC(生物炭)为载体,采用化学共沉淀法制备了Fe3O4/BC(生物炭负载的纳米四氧化三铁)复合材料,并将其应用于水体中PO43--P的吸附去除;探究了Fe3O4/BC对水中PO43--P的吸附-解析性能,考察了纳米Fe3O4负载比例、吸附体系pH和初始ρ(PO43--P)等因素对Fe3O4/BC吸附PO43--P效率的影响,并考察了吸附机制.结果表明:所制备的Fe3O4纳米颗粒呈球形,均匀散布在生物炭表面;Fe3O4/BC复合材料能高效吸附水中的PO43--P,在pH=3、温度为25℃、ρ(PO43--P)为50 mg/L、Fe3O4/BC投加量为400 mg(二者质量比为1:1),吸附3 h达到平衡后,Fe3O4/BC吸附PO43--P效率达到92.14%.Fe3O4/BC复合材料吸附PO43--P的机制包括配位体交换和静电吸引,吸附过程较好地符合准二级动力学模型和Langmuir等温吸附方程.Fe3O4/BC具有良好的解析性能,用c(NaOH)为2.0 mol/L的溶液对吸附PO43--P饱和后的Fe3O4/BC进行解析,解析效率达到80%.研究显示,Fe3O4/BC重复利用性好,在第4次利用后还能保持75%以上的吸附效率.
关键词:  生物炭  纳米Fe3O4  Fe3O4/BC  PO43--P  去除效率
DOI:10.13198/j.issn.1001-6929.2017.03.61
分类号:X5
基金项目:农业部公益性行业(农业)科研专项(20150306);江苏省农业自主创新资金项目〔CX(15)5004〕;江苏省六大人才高峰项目(NY-054)
Preparation of Fe3O4/BC Composite and Its Application for Phosphate Adsorptive Removal
HU Xiaolian1,2, YANG Linzhang1,2, HE Shiying1,2, FENG Yanfang1,2, ZHOU Yuling1
1. Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China;2. Jiangsu Synthetic Innovation Center for Coastal Bio-Agriculture, Yancheng 224002, China
Abstract:
Phosphate is one of the key factors that responsible for eutrophication of surface waters, and adsorption technique is competitive to remove phosphate from aqueous solutions due to its high efficient and low cost. As is known, magnetic adsorbent such as magnetite (Fe3O4) can be easily recovered from aqueous solution by magnetic force, which avoids adsorbate release from adsorbent surface. However, magnetite is unstable and easy to aggregate in aqueous solutions, resulting in low removal efficiency. In the present study, a nano-composite (Fe3O4/BC) was synthesized by co-precipitation method, which was to load nano-Fe3O4 ontothe surface of black carbon (BC). Subsequently, Fe3O4/BC was applied to remove phosphate from wastewater. Fe3O4/BC was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and Zeta potential. Furthermore, removal efficiency and desorption efficiency of phosphate by Fe3O4/BC was investigated.Results showed that the removal efficiency of phosphate by Fe3O4/BC was higher than that of Fe3O4. The maximum removal efficiency reached 92.14% under the following conditions: pH 3, initial phosphate concentration 50 mg/L, 400 mg Fe3O4/BC (t mass ratio Fe3O4∶BC=1∶1) and reaction temperature of 25 ℃. BC as supporter improved the dispensability of Fe3O4. The removal mechanism can be explained by ligand exchange and electrostatic attraction. Fe3O4/BC was observed good adsorption capacity and could be separated fast and easily from aqueous solution by a permanent magnet. Kinetics studies showed that the adsorption process followed the pseudo-second-order kinetic model. Meanwhile, isotherm data showed that phosphate removal by Fe3O4/BC could be well described using Langmuir model. The desorption efficiency of phosphate from Fe3O4/BC reached 80% in NaOH solution (2 mol/L). Moreover, the removal efficiency of the recycled Fe3O4/BC reached 75% even during the fourth cycle. Fe3O4/BC could effectively remove phosphate from aqueous solutions, which was consistent with green chemistry principle and was a promising phosphate adsorbent in future application.
Key words:  BC  Fe3O4  Fe3O4/BC  PO43--P  removal efficiency