COPPER HEXACYANOFERRATE (II): SYNTHESIS, CHARACTERIZATION, AND CESIUM, STRONTIUM ADSORBENT APPLICATION

Tạp chí Khoa học Đại học Đà Lạt

Dong Phuong Truong¹  Vu Tram Anh Le¹  Tran Thuy Hong Nguyen¹  Dinh Trung Nguyen¹  Thi Dan Thy Kieu¹  Ping Ning²  Thi Huong Giang Duong³  Kim Dan Ho⁴ 

[1] Dalat University;Kunming University of Science and Technology;Lam Ha High School;Van Lang University;

关键词: adsorption;    cesium;    copper hexacyanoferrate;    strontium.;   

DOI  :  10.37569/DalatUniversity.11.4.901(2021)

来源: DOAJ

【 摘 要 】

Low-cost nanoscale copper hexacyanoferrate (CuHF), a good selective adsorbent for cesium (Cs+) removal, was prepared using the chemical co-precipitation method. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and high-resolution transmission electron microscopy (HR-TEM) were conducted to determine the CuHF morphology. Copper hexacyanoferrate, Cu13[Fe(CN)6]14.(2K).10H2O, has a cubic structure (space group F-43m) in the range of 10-30 nm and a Brunauer-Emmett-Teller (BET) surface area of 462.42 m2/g. The removal of Cs+ and Sr2+ is dependent on pH; the maximum adsorption capacity (qmax) of CuHF is achieved at a pH = 6. From the Langmuir model, qmax = 143.95 mg/g for Cs+ and 79.26 mg/g for Sr2+, respectively. At high concentrations, Na+, Ca2+, and K+ ions have very little effect on Cs+ removal, and Na+ and K+ ions have a higher affinity for removing Sr2+ than Ca2+ at all concentrations. CuHF has a high affinity for alkaline cations in the order: Cs+ > K+ > Na+ > Ca2+ > Sr2+, as proposed and discussed.

【 授权许可】

Unknown