Zr-γ-FeOOH nanoparticle adsorbent for As(V) and As(III) removal was prepared by a chemical co-precipitation method. Compared with γ-FeOOH, the addition of Zr enhanced the adsorptive capacities of As(V) and As(III). The maximum adsorptive capacities for As(V) and As(III) were 69.81 and 94.25 mg/g, respectively (rate Fe:Zr =1:0.5) at pH= 7.0. The adsorption data accorded with Langmuir and Freundlich isotherms. The adsorption of As(III) by Zr- γ-FeOOH was found to be effective in wide pH range of 6–8. Competitive ions hindered the adsorption according to the decreasing sequence phosphate, sulfate, ammonium, chloride, magnesium and calcium. The high adsorptive capability and good performance on other aspects make the Zr-γ- FeOOH nanorods a promissing adsorbent for the removal of As(V) and As(III) from groundwater.
Co2[Fe(CN)6]/Fe3O4 nanoparticle adsorbent for ion cesium (Cs+) sorption was prepared by a chemical co-precipitation method. The magnetization of the materials makes them to be separated easyly from an aqueous solution by an external magnetic field. The ion Cs+ absorption by Co2[Fe(CN)6]/Fe3O4 nanoparticle follow the ion exchange mechanism, ion exchange capacity depends on the pH, the maximum ion exchange capacity of the material at pH = 4 is 0.40 meq (Cs+)/ g. After 15 min, about 98% of initial ion Cs+ concentration was removed from the solution, the adsorption could be described by Langmuir and Freundlich isotherms. The high adsorption capacity and good performance on other aspects, make the Co2[Fe(CN)6]/Fe3O4 nanoparticle a promissing adsorbent for the removal of ion Cs+ from water.
Adsorption of Cs+ ion from aqueous solution by Zn2[Fe(CN)6] and Zn3[Fe(CN)6]2 nanoparticle, and the effect of experimental conditions on the adsorption were investigated. Preliminary results showed that two materials were very efficient as an absorbent. Zn2[Fe(CN)6] and Zn3[Fe(CN)6]2 nanoparticle adsorbents for removal Cs+ion from solution have been successfully synthesized. Comparison between two materials, the Cs + ion adsorption capacity of Zn2[Fe(CN)6] was higher than Zn3[Fe(CN)6]2 and the reaction time was shorter. The adsorption equilibrium time of Zn3[Fe(CN)6]2 was about 20 hours, and the suitable pH range 3-7 while the Zn2[Fe(CN)6] was 15 minutes. The Cs+ ion absorption by Zn2[Fe(CN)6] nanoparticle follow the ion exchange mechanism, the best exchange capacities of the material were in the pH 3-5 range, ion exchange capacity depended on the pH, the maximum ion exchange capacity of the material at pH = 4 was 1.01 meq (Cs+) / g. After 15 min, about 98% of initial Cs+ ion concentration was removed from the solution; the adsorption data did not accord with Langmuir and Freundlich isotherms. The high adsorption capacity and good performance on other aspects, make the Zn2[Fe(CN)6] nanoparticle a promising adsorbent for the removal of Cs+ ion from water.
Trong nghiên cứu này, khả năng hấp thụ ion Cs+ từ dung dịch CsCl sử dụng hạt nano Cu2[Fe(CN)6] được quan tâm. Vật liệu nano Cu2[Fe(CN)6] đã được tổng hợp; phổ kế nhiễm xạ tia X (XRD) được dùng để phân tích các đặc trưng của Cu2[Fe(CN)6]; kĩ thuật huỳnh quang tia X phản xạ toàn phần được sử dụng để xác định khả năng hấp phụ. Một số đặc trưng của Cu2[Fe(CN)6] như: khoảng cách giữa các nút mạng nguyên tử (d), tham số mạng (a), và thể tích của các hạt nano đã được tính toán rõ ràng. Tất cả các thực nghiệm thực hiện ở điều kiện pH =7 và nhiệt độ phòng, đồng thời thay đổi nồng độ chất bị hấp phụ. Mô hình lí thuyết đẳng nhiệt Freundlich và Langmuir được sử dụng để xác định hệ số hỗn hợp của quá trình hấp thụ/ phản hấp thụ (1/n), và dung lượng hấp phụ cực đại của ion Cs+ (qmax).
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