海藻酸钠对鸟粪石结晶的影响及机理研究

发布时间：2018-08-12 12:01

【摘要】：鸟粪石结晶沉淀法回收剩余污泥中磷工艺具有良好应用前景,然而污泥中的一些有机物,特别是胞外聚合物(EPS)将对鸟粪石结晶产生一定的影响.海藻酸钠(SA)在物化性质上接近于EPS,为较深入地探究此影响机理,以SA作为EPS的代用化合物采用恒组分、恒p H实验来考察EPS对鸟粪石结晶的影响,并借助红外光谱(FTIR)和X射线光电子能谱(XPS)分析来探讨SA与鸟粪石晶体之间的作用机理.结果表明,在SA浓度0~250mg/L范围内,随其浓度的增大鸟粪石结晶生长速率降低,鸟粪石晶体的尺寸有所减小,其原因是海藻酸阴离子吸附并掩蔽鸟粪石表面生长活性点上阻碍晶体生长.这种吸附作用是由鸟粪石表面Mg2+、磷酸羟基团(POH)分别与SA中COOH、C=O、COC键合共同引起的,而鸟粪石表面的NH_4~+并未参与反应.
[Abstract]:The process of recovering phosphorus from surplus sludge by crystallization precipitation of guano stone has a good prospect. However, some organic matter in sludge, especially the extracellular polymer (EPS), will have a certain effect on the crystallization of guano stone. The physicochemical properties of sodium alginate (SA) are close to those of EPS. In order to explore the mechanism of this effect, the effect of EPS on the crystallization of guano stone was investigated by using constant component and constant pH experiment with SA as the substitute compound of EPS. The interaction mechanism between SA and gustonite crystals was investigated by means of infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis. The results show that in the range of SA concentration 0~250mg/L, the crystal growth rate decreases with the increase of SA concentration, and the crystal size decreases with the increase of SA concentration. The reason is that the alginate anion adsorbs and masked the crystal growth at the active point of the surface growth of guanderite. The adsorption is caused by the bonding of Mg2 and (POH) with COOHCCOC in SA, while NH4 ~ + does not take part in the reaction.
【作者单位】：合肥工业大学纳米矿物与环境材料实验室资源与环境工程学院;合肥工业大学分析测试中心;
【基金】：国家自然科学基金资助项目(41130206,51579061)
【分类号】：X703

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