In this study, we aim to synthesize nano zinc oxide(ZnO NP) and apply it to remove phosphate in aqueous solution. Chemically prepared ZnO materials are a simple and effective method for large-scale production of ZnO at the nanoscale. The surface properties and material structure of zinc oxide nanoparticles were determined through the use of scanning electron microscopy and X-ray diffraction methods. Batch experiments were performed to evaluate the adsorption capacity. by-products of ZnO materials. The effects of solution pH, adsorption time, amount of adsorbent and initial phosphate concentration on the adsorption capacity were investigated to determine the appropriate conditions for the phosphate removal process. The results showed high phosphate removal capacity at wide pH range 3–7 after 90 min with adsorbent dosage of 0.6 g/L. The adsorption of phosphate follows Langmuir isotherm with adsorption capacity. a maximum of 100 mg/g. Phosphate removal in wastewater of Lam Thao Fertilizer and Chemical Joint Stock Company (Phu Tho) was also carried out with a high removal efficiency of 88.75%.
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Authors: Pham Huong Quynh, Dang Van Thanh, Tran Quoc Toan, Nguyen Nhat Huy, Nguyen Thi Thuy
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