杨金梅^1,2,,
吕建波^1,2,
李莞璐¹,
孙力平^1,2,
王少坡^1,2,
程方^1,2
1.天津城建大学环境与市政工程学院，天津 300384
2.天津市水质科学与技术重点实验室，天津 300384
基金项目: 国家自然科学基金资助项目（51478292）
天津市自然科学基金资助项目 （12JCYBJC14800）
天津市水质科学与技术重点实验室开放基金资助项目（TJKLAST-PT-2016-05）
国家水体污染控制与治理科技重大专项 （2017ZX07107-002-4）

Adsorption of phosphate by nano akaganeite impregnated chitosan

YANG Jinmei^1,2,,
LYU Jianbo^1,2,
LI Wanlu¹,
SUN Liping^1,2,
WANG Shaopo^1,2,
CHENG Fang^1,2
1.School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjing 300384, China
2.Key Laboratory of Water Quality Science and Technology, Tianjing 300384, China

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摘要:低浓度的磷在污水处理中较难去除，排放至水体会造成水体富营养化。采用溶胶-凝胶法，以壳聚糖和FeCl3·6H2O为原料，通过原位水解-浸渍法制备出壳聚糖载纳米羟基氧化铁（CNFeOOH），对其进行了场发射透射电镜（HRTEM）、比表面积和孔径、X射线衍射仪（XRD）分析的表征。结果表明，CNFeOOH中含有类似正方针铁矿（β-FeOOH）的晶体结构，呈纳米棒状分布，长约10 nm，宽约2~3 nm，比表面积为76.240 m2·g-1。磷吸附实验结果表明：Freundlich吸附等温式能更好地描述CNFeOOH对磷的吸附特征，其实际最大吸附量为24.50 mg·g-1（pH=6，T=（20±1）℃）；动力学吸附平衡时间约为24 h，其吸附过程符合准二级动力学模式和颗粒内扩散模式，证明吸附过程中同时发生了物理吸附和化学吸附；溶液的pH对CNFeOOH吸附磷的影响较为明显，随pH升高，吸附量降低；离子强度（0.01~0.5 mol·L-1）则影响不大；共存阴离子（SO42- 、NO3- 、HCO3-）对磷的吸附影响较小。因此，推断CNFeOOH对磷的吸附机理是以静电引力和配位作用为主的特性吸附。
关键词: 低浓度的磷/
壳聚糖载纳米羟基氧化铁/
棒状/
吸附

Abstract:Low-concentration phosphate is difficult to be removed during wastewater treatment process, whose excessive discharge into surface water could cause eutrophication. A novel sorbent of rod-like nano akaganeite impregnated chitosan (CNFeOOH) was fabricated via in-situ hydrolysis and impregnation technique using FeCl3·6H2O and chitosan in this study. The sorbent was characterized using multiple techniques and its performance for phosphate (PO43-) removal from aqueous solution was investigated. Analyses including high resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller (BET) surface area and pore size distribution , X-ray diffraction (XRD) confirmed the structural characteristics of the sorbent. Above results indicated that the iron oxide particles in CNFeOOH is nano akaganeite (β-FeOOH) , whose shape was rod-like with a length of about 10 nm and a width of about 2 to 3 nm. The specific surface area of CNFeOOH was about 76.240 m2·g-1. The data obtained from batch experiments could be well described using Freundlich isotherm model. Meanwhile, the maximum adsorption capacity was 24.50 mg·g-1 when the solution pH was 6 at room temperature. CNFeOOH had a high adsorption rate towards phosphate, which was fitted better with the pseudo-second-order kinetics model. The sorption of phosphate on CNFeOOH was strongly dependent on pH, whereas its sorption was weakly dependent on ionic strength and coexisting SO42-, NO3- and HCO3-. It can be inferred from above analyses that phosphate adsorption mechanism on the CNFeOOH surface was dominated by electrostatic attraction and ligand exchange.
Key words:low-concentration phosphate/
nano akaganeite impregnated in chitosan/
rod/
adsorption.

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刊出日期:2018-05-19

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壳聚糖载纳米羟基氧化铁对水中磷的吸附

杨金梅^1,2,,
吕建波^1,2,
李莞璐¹,
孙力平^1,2,
王少坡^1,2,
程方^1,2
1.天津城建大学环境与市政工程学院，天津 300384
2.天津市水质科学与技术重点实验室，天津 300384
基金项目: 国家自然科学基金资助项目（51478292） 天津市自然科学基金资助项目 （12JCYBJC14800） 天津市水质科学与技术重点实验室开放基金资助项目（TJKLAST-PT-2016-05） 国家水体污染控制与治理科技重大专项 （2017ZX07107-002-4）
关键词: 低浓度的磷/
壳聚糖载纳米羟基氧化铁/
棒状/
吸附
摘要:低浓度的磷在污水处理中较难去除，排放至水体会造成水体富营养化。采用溶胶-凝胶法，以壳聚糖和FeCl3·6H2O为原料，通过原位水解-浸渍法制备出壳聚糖载纳米羟基氧化铁（CNFeOOH），对其进行了场发射透射电镜（HRTEM）、比表面积和孔径、X射线衍射仪（XRD）分析的表征。结果表明，CNFeOOH中含有类似正方针铁矿（β-FeOOH）的晶体结构，呈纳米棒状分布，长约10 nm，宽约2~3 nm，比表面积为76.240 m2·g-1。磷吸附实验结果表明：Freundlich吸附等温式能更好地描述CNFeOOH对磷的吸附特征，其实际最大吸附量为24.50 mg·g-1（pH=6，T=（20±1）℃）；动力学吸附平衡时间约为24 h，其吸附过程符合准二级动力学模式和颗粒内扩散模式，证明吸附过程中同时发生了物理吸附和化学吸附；溶液的pH对CNFeOOH吸附磷的影响较为明显，随pH升高，吸附量降低；离子强度（0.01~0.5 mol·L-1）则影响不大；共存阴离子（SO42- 、NO3- 、HCO3-）对磷的吸附影响较小。因此，推断CNFeOOH对磷的吸附机理是以静电引力和配位作用为主的特性吸附。

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