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摘要
The specific adsorption characteristics of phosphorus on porous biomorph-genetic composite of Fe/C with ginkgo shell template (PBGC-Fe/C-G) were studied by using PBGC-Fe/C-G as an adsorbent. Static adsorption tests were carried out to study the influencing factors of the adsorbent dosage, the pH of the solution, the initial concentration of phosphorus, and the particle size. The morphological properties of PBGC-Fe/C-G before and after the adsorption were characterized by using SEM, EDS, XRD and FT-IR. The adsorption mechanisms of phosphorus on PBGC-Fe/C-G were investigated by morphological characterization of the adsorbent combined with adsorption kinetic test. The research indicated that the maximum adsorption capacity of phosphorus on PBGC-Fe/C-G was 1.62 mg/g under the experimental conditions: phosphorus concentration<10 mg/L, the adsorbent dosage=0.2 g/(50 mL), the solution pH=3, reaction temperature 45 ℃, the particle size of the adsorbent<100 mesh (<0.149 mm). The pseudo-second-order kinetic model and Freundlich model fit the phosphate adsorption by PBGC-Fe/C-G well. The thermodynamics results of ΔG<0, ΔS>0 and ΔH>0 showed that the adsorption process of PBGC-Fe/C-G for phosphorus was a spontaneous, entropy-increasing endothermic process. The research showed that phosphorus adsorption on PBGC-Fe/C-G was accomplished cooperatively by coordination reaction, electrostatic attraction, anion exchange and physical adsorption, in which the coordination reaction between the Fe active site and the phosphate ion was the main reaction process. ? 2019, Editorial Board, Research of Environmental Sciences. All right reserved.
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