白果壳遗态Fe/C复合材料对水中磷的吸附特征

为研究PBGC-Fe/C-G（白果壳遗态Fe/C复合材料）对水中磷的吸附特征，以PBGC-Fe/C-G为吸附剂，对吸附剂投加量、溶液体系pH、初始磷质量浓度、温度和吸附剂粒径为影响因素进行静态吸附试验分析，并结合SEM、EDS、XRD和FT-IR等手段对吸附前、后材料进行表征，以揭示PBGC-Fe/C-G的吸附除磷机制.结果表明:①当初始磷质量浓度 < 10 mg/L、吸附剂投加量为0.2 g/（50 mL）、溶液为酸性（pH=3）、反应温度为45℃、吸附剂粒径 < 0.149 mm时，吸附效果最佳，吸附量达1.62 mg/g.②准二级动力学模型和Freundlich吸附等温模型能较好地模拟PBGC-Fe/C-G对磷的吸附过程.③热力学结果显示，ΔG < 0、ΔS>0和ΔH>0，说明PBGC-Fe/C-G对磷的吸附过程是自发、熵增的吸热过程.研究显示，PBGC-Fe/C-G吸附除磷主要通过配位作用、静电引力、等电荷离子交换和物理作用4种协同完成，其中Fe活性位与磷酸根离子的配位反应为主要的反应过程. 

Adsorption Characteristics of Phosphate in Water by the Porous Biomorph-Genetic Composite of Fe/C with Ginkgo Shell Template

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.