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首页> 外文期刊>RSC Advances >Effect of hydroxyapatite particle size on the formation of chloropyromorphite in anglesite–hydroxyapatite suspensions
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Effect of hydroxyapatite particle size on the formation of chloropyromorphite in anglesite–hydroxyapatite suspensions

机译：羟基磷灰石粒径对角位-羟基磷灰石悬浮液中亚氯次黄酸盐形成的影响

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Anglesite (PbSO4), a widely available form of Pb whose bioavailability has been the focus of a few studies, was selected in the present study and reacted with synthetic hydroxyapatites (Ca5(PO4)3OH, HAPs) of different sizes (approximately 20.08 nm, 60.24 nm, and micron-sized) at various P?:?Pb molar ratios and under various constant pH conditions. Particle size was discovered to strongly affect the immobilisation of Pb and the transformation from anglesite to chloropyromorphite (Pb5(PO4)3Cl) by the HAPs, in addition to the dissolution properties of HAP. The complete transformation from anglesite to chloropyromorphite was achieved at a pH of 4–5 for 20.08 nm-sized HAPs, whereas incomplete transformations of the 60.24 nm and micro-HAPs were obtained at these pH. At pHs of ≥6 (HAPs of size 20.08 nm) and ≥5 (60.24 nm), the smaller-particle HAPs were incompletely dissolved, and their surfaces were coated by newly formed chloropyromorphite, which was in contrast to the micro-HAPs, which were at pH ≥ 3. These results demonstrated that the surface coating rate decreased when the HAP particle size was decreased; thus, smaller-particle HAPs completely immobilised anglesite by forming chloropyromorphite at higher pH, particularly when the P?:?Pb molar ratio was high. This study demonstrated that nano-HAPs have potential for use in the situ immobilisation of Pb in low-acidity soil and waste without requiring the P solubility enhancement through the use of acidic conditions or an increase in the number of HAPs.
机译：在本研究中，选择了角位点（PbSO 4 ），它是一种广泛可用的Pb，其生物利​​用度一直是少数研究的重点，并与合成羟基磷灰石（Ca 5 （PO 4 ） 3 OH，在不同的P3：？Pbb摩尔比下以及在不同的恒定pH条件下，具有不同大小（大约20.08 nm，60.24 nm和微米大小）的HAP）。发现颗粒大小对Pb的固定化和从角位转变为亚氯焦（Pb 5 （PO 4 ） 3 Cl）。对于20.08 nm大小的HAP，在4-5的pH值下可实现从角位到氯焦亚铁石的完全转化，而在这些pH值下可获得60.24 nm和微型HAP的不完全转化。在pH值≥6（HAP尺寸为20.08 nm）和≥5（60.24 nm）时，较小颗粒的HAP不能完全溶解，并且其表面被新形成的氯焦亚晶石覆盖，这与微型HAP相反。 pH≥3时。这些结果表明，当HAP粒径减小时，表面覆盖率降低;因此，较小的HAP通过在较高的pH值下形成绿焦晶石而完全固定了角位，特别是当P3：ΔPb摩尔比高时。这项研究表明，纳米HAP具有潜在性，可用于在低酸性土壤和废物中原位固定Pb，而无需通过使用酸性条件或增加HAP数量来提高P溶解度。

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