天然菱鐵礦去除水中磷的性能研究
發(fā)布時(shí)間：2019-01-05 03:44
【摘要】：采用批次試驗(yàn)研究菱鐵礦對(duì)水溶液中磷的吸附特性,考察了初始磷濃度、p H值、菱鐵礦投加量、粒徑、共存離子對(duì)吸附的影響,并探討了吸附動(dòng)力學(xué)和吸附熱力學(xué)特征.結(jié)果表明,當(dāng)磷溶液初始濃度為20 mg·L-1,初始p H為6.0時(shí),菱鐵礦對(duì)磷的吸附效果較好,吸附平衡時(shí)間為48h.菱鐵礦投加量為0.5~10 g時(shí),隨著投加量的增加,菱鐵礦對(duì)磷的吸附效能逐漸提高.相對(duì)于NO-3、Cl-而言,SO2-4、HCO-3對(duì)菱鐵礦去除磷有微弱的抑制作用.動(dòng)力學(xué)研究發(fā)現(xiàn),菱鐵礦對(duì)磷的吸附過程更符合準(zhǔn)二級(jí)動(dòng)力學(xué)模型,吸附平衡可由Freundlich等溫線方程描述,飽和吸附量為83.5μg·g-1.最后分別計(jì)算了288、303和318 K下的吸附熱力學(xué)參數(shù),發(fā)現(xiàn)吉布斯自由能(ΔG)均為負(fù),焓變(ΔH)及熵變(ΔS)為正,表明該吸附過程為自發(fā)的吸熱反應(yīng).
[Abstract]:The adsorption characteristics of phosphorus in aqueous solution by siderite were studied by batch test. The effects of initial phosphorus concentration (, p H), siderite dosage, particle size and coexisting ions on the adsorption were investigated. The adsorption kinetics and thermodynamic characteristics were also discussed. The results show that when the initial concentration of phosphorus solution is 20 mg L ~ (-1) and initial pH is 6.0, the adsorption efficiency of siderite is better and the adsorption equilibrium time is 48 h. When the dosage of siderite is 0.5 ~ 10 g, the adsorption efficiency of siderite to phosphorus increases with the increase of the amount of siderite. Compared with NO-3,Cl-, SO2-4,HCO-3 has a weak inhibitory effect on phosphorus removal from siderite. The kinetic study shows that the adsorption process of phosphorus on siderite is more in accordance with the quasi-second-order kinetic model, the adsorption equilibrium can be described by Freundlich isotherm equation, and the saturated adsorption capacity is 83.5 渭 g g-1. Finally, the adsorption thermodynamic parameters at 288303 and 318K were calculated. It was found that the Gibbs free energy (螖 G) was negative, the enthalpy change (螖 H) and entropy change (螖 S) were positive, which indicated that the adsorption process was spontaneous endothermic reaction.
【作者單位】： 南京大學(xué)環(huán)境學(xué)院污染控制與資源化研究國家重點(diǎn)實(shí)驗(yàn);
【基金】：江蘇省科技廳政策引導(dǎo)類計(jì)劃項(xiàng)目(No.BY2015060-05) 污染控制與資源化研究國家重點(diǎn)實(shí)驗(yàn)室開放基金~~
【分類號(hào)】：X703
本文編號(hào)：2401219
[Abstract]:The adsorption characteristics of phosphorus in aqueous solution by siderite were studied by batch test. The effects of initial phosphorus concentration (, p H), siderite dosage, particle size and coexisting ions on the adsorption were investigated. The adsorption kinetics and thermodynamic characteristics were also discussed. The results show that when the initial concentration of phosphorus solution is 20 mg L ~ (-1) and initial pH is 6.0, the adsorption efficiency of siderite is better and the adsorption equilibrium time is 48 h. When the dosage of siderite is 0.5 ~ 10 g, the adsorption efficiency of siderite to phosphorus increases with the increase of the amount of siderite. Compared with NO-3,Cl-, SO2-4,HCO-3 has a weak inhibitory effect on phosphorus removal from siderite. The kinetic study shows that the adsorption process of phosphorus on siderite is more in accordance with the quasi-second-order kinetic model, the adsorption equilibrium can be described by Freundlich isotherm equation, and the saturated adsorption capacity is 83.5 渭 g g-1. Finally, the adsorption thermodynamic parameters at 288303 and 318K were calculated. It was found that the Gibbs free energy (螖 G) was negative, the enthalpy change (螖 H) and entropy change (螖 S) were positive, which indicated that the adsorption process was spontaneous endothermic reaction.
【作者單位】： 南京大學(xué)環(huán)境學(xué)院污染控制與資源化研究國家重點(diǎn)實(shí)驗(yàn);
【基金】：江蘇省科技廳政策引導(dǎo)類計(jì)劃項(xiàng)目(No.BY2015060-05) 污染控制與資源化研究國家重點(diǎn)實(shí)驗(yàn)室開放基金~~
【分類號(hào)】：X703
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本文編號(hào)：2401219
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