Preparation Of ZrO₂-doped Activated Carbon And Magnetic Zr-Fe Oxide Nanomaterials And Their Adsorption Of Phosphate

Phosphorus?P?as an essential element plays an important role for all living and widely used in industry and agriculture,which also led to a lot of phosphates into aquatic systems and cause eutrophication and ecosystem degradation.Hence,it is essential to control the emission amount of phosphorus to protect environment.Among phosphorus removal approaches,the adsorption method with simple operation,low cost and high efficiency was extensively studied.Metal oxides and activated carbon materials are the hot materials in the research of phosphorus removal adsorbent.Zirconium oxide in metal oxides is widely used in phosphorus removal due to its low cost,non-toxic,environmental protection,acid resistance,alkali resistance and phosphate affinity.The iron base material is also widely concerned because of its good magnetic separation performance.Activated carbon materials,due to their large specific surface area and good modifiability,are often used as carrier materials of metal oxides to effectively remove phosphorus.At present,the phosphorus removal adsorbents with high efficiency adsorption and separation,low cost,simple preparation,and excellent recycling performance are urgently needed to solve the problem by researches.In this paper,Zr O₂ doped activated carbon materials and magnetic Zr-Fe oxide nanomaterials were prepared by simple method,and the adsorption properties of phosphate were investigated.Zr O₂ doped active carbon materials was synthesized by bagasse and Zr OCl₂·8H₂O as raw materials using high temperature activation method.The materials were characterized by FT-IR,XRD,SEM,XPS,VSM and N₂ adsorption-desorption experiments,indicating that the material had a large specific surface area and mesoporous structure.The adsorption experiment showed that the optimal doping amount of Zr OCl₂·8H₂O was 10%of the bagasse quality,and the maximum adsorption capacity of the theory was 41.41 mg P·g^-1?308 K?.Magnetic Zr-Fe oxide nanomaterials were prepared by Zr OCl₂·8H₂O and Fe SO₄·8H₂O as raw materials using solvothermal method.The material was characterized by means of correlation characterization.It indicated that the material had a large specific surface area and mesoporous structure,which composed of 50nm?60 nm nanoparticles.The optimal solvothermal conditions were explored,which the heating rate is 1 min/°C,the reaction temperature is 150°C and keeping time is 1 h.The adsorption experiment showed that the materials show good adsorption performance and circulation performance,and the optimal molar doping ratio of Zr/Fe was 1:0.5.The maximum adsorption capacity calculated by the experimental data was 50.20 mg P·g^-1?308 K?,which was very close to the experimental result 47.42 mg P·g^-1,when the dosage of adsorbent was 1.5 g·L^-1,and the p H of KH₂PO₄(50 mg P L^-1)was 3.The maximum adsorption capacity of pyrophosphate on adsorbent was46.08 mg P·g^-1 with adsorbent dosage of 1.0 g·L^-1 and p H 3.