Synthesis of iron phosphate-SAPO-34 composite and its application as effective absorbent for wastewater treatment

¹ Faculty of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai 201209, P.R. China
² Research Center of Resource Recycling Science and Engineering, Shanghai Polytechnic University, Shanghai 201209, P.R. China

^a Corresponding author: ljwang@sspu.edu.cn

Abstract

High-purity FePO₄ was purified from iron-based phosphating slag as raw material, and FePO₄@SAPO-34 was synthesized by hydrothermal crystallization method under the action of templating agent-diethylamine. The synth esized FePO₄@SAPO-34 samples were characterized by x-ray diffraction (XRD), scanning electron microscopy (SE M) and Fourier transform infrared spectroscopy (FT-IR). The effects of different crystallization time on the morpholo gy and crystallization of FePO₄@SAPO-34 crystals were investigated. The removal of heavy metal ion wastewater by low-cost FePO₄@SAPO-34 was investigated. The experimental results show that when the reaction time is 180 °C an d the reaction time is 72h, the crystallization of FePO₄@SAPO-34 is the best. When the dosage is 0.6g, the removal efficiency of heavy metal ions is the highest.