【摘要】：用掃描電子顯微鏡、透射電子顯微鏡、X射線衍射儀、X射線熒光和Fourier紅外等技術(shù)研究了銅陵新橋天然菱鐵礦吸附除磷前后的結(jié)構(gòu)和組成特征,結(jié)合粒徑、溶液p H、反應(yīng)溫度、干擾離子、溶解氧對菱鐵礦吸附除磷的效果影響,分析了天然菱鐵礦深度除磷的效果及機(jī)理。靜態(tài)吸附實驗表明:25℃室溫下,在初始磷濃度為1 mg/L,固液質(zhì)量比為1㑳500時,吸附后溶液中殘留磷濃度低于0.025 mg/L,處理后的磷濃度滿足地表水環(huán)境質(zhì)量Ⅱ類標(biāo)準(zhǔn)。動力學(xué)、熱力學(xué)實驗結(jié)果表明:25℃室溫下,接觸反應(yīng)8 h時可達(dá)到平衡,過程較好地符合Lagergren準(zhǔn)二級速率方程;天然菱鐵礦對磷的去除規(guī)律可用Langmuir模型很好地描述,靜態(tài)實驗除磷飽和容量為6.101 mg/g,并且不受水體共存離子影響。其除磷作用機(jī)理主要是菱鐵礦中亞鐵經(jīng)氧化產(chǎn)生新生鐵氧化物對磷酸根的化學(xué)吸附,溶解氧對除磷有顯著影響。吸附的產(chǎn)物是以雙齒雙核表面配位為主,以少量單齒單核表面配位為輔的配位化合物。利用天然菱鐵礦在水中氧化產(chǎn)生鐵氫氧化物的特性,在城市生活污水深度除磷以及富營養(yǎng)化水體凈化領(lǐng)域具有潛在應(yīng)用價值。
[Abstract]:By means of scanning electron microscope, transmission electron microscope, X-ray diffractometer, X-ray fluorescence and Fourier infrared technique, the structure and composition of natural siderite in Tongling before and after adsorption and removal of phosphorus were studied, combining with particle size, solution pH, reaction temperature, etc. The effect of interfering ions and dissolved oxygen on the adsorption and removal of phosphorus from siderite was studied. The effect and mechanism of deep phosphorus removal from natural siderite were analyzed. The static adsorption experiments show that at 25 鈩，

本文編號：2268921