2.浙江大学衢州研究院,衢州 324000
1.College of Chemical & Biochemical Engineering, Zhejiang University, Hangzhou 310027, China
2.Institute of Zhejiang University - Quzhou, Quzhou 324000, China
水体中微量磷元素的存在会引发水体富营养化等环境问题,为此,通过合成无定型的碳酸镧(LC)纳米吸附剂,从而实现磷在中性或碱性溶液中的高效去除。分别使用X射线衍射、扫描电子显微镜、透射电镜、热重和Zeta(ζ)电位等分析手段对吸附剂材料的结构和形貌进行了分析和表征。结果表明,在溶液中加入晶型导向剂(Mg
经碱再生后可继续保持高脱磷能力,4次循环操作后磷去除能力仍可达96.8%。以上研究结果对污染水体中低浓度磷元素的去除及工程应用具有参考价值。
The presence of trace phosphate in water may cause major environmental problems such as eutrophication of water bodies. In this study, a type of nano-scale adsorbent of amorphous lanthanum carbonate (LC) was prepared to efficiently remove phosphate (P) from water and wastewater under neutral or alkaline conditions. The microstructure and morphology of LC were analyzed and characterized by XRD, SEM, TEM, TGA and Zeta potential. The results showed that addition of magnesium ions as a type of crystal orientation agent and adjustment of the reaction temperature could had effects on the morphology, microstructure and P removal efficiency of LC. When the LaCl
) had a unique amorphous spherical structure. Batch adsorption experiments revealed that LC
had a strong performance on phosphate removal over a wide pH range (3.0 to 11.0). The equilibrium data were well fitted by the Langmuir model, and kinetic data followed a pseudo-second-order model, which suggests that a monolayer phosphate adsorption onto LC
occurred with chemisorption or chemical bonding between adsorbent active sites and phosphate anions, and the maximum adsorption capacity could reach 112.8 mg·g
. It was also found that the regenerated LC
could maintain a high dephosphorization capacity. After 4 operating cycles, the phosphate removal capacity could still reach 96.8%. All these results suggested that LC can be used as a promising adsorbent for removing low-concentration of phosphate from water and wastewater.
.
XRD pattern and SAED images of LC
SEM and TEM images of LC
as a function of initial solution pH
dosage on phosphate removal
Adsorption kinetic parameters of pseudo-first-order and pseudo-second-order equations
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