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Preparation and defluorination mechanism of a novel copolymerized hydroxyapatite-aluminium chloride material

机译：新型羟基磷灰石-氯化铝共聚材料的制备与脱氟机理

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As an attempt to avoid the low defluoridation capacity of conventional adsorbents, this study offers a novel copolymerized hydroxyapatite-aluminum (HAP-PAC) adsorbent and evaluates its performance in fluoride removal of drinking water, and a possible fluoride removal mechanism is proposed based on the characterization results obtained by FTIR, XRD, BET, SEM and EDS. The results indicate that the copolymerization material prepared by co-crystallization with aluminum chloride is featured by the chemical combination between hydroxyapatite (HAP) and poly-aluminium chloride (PAC). A certain amount of Ca2+ and OH- in the HAP crystal lattice are partially replaced by Al3+ and Cl- doping from PAC, and the structure of the copolymerization material shows a uniform trend. In addition, mainly by chemical adsorption, the highest defluoridation capacity (DC) of the copolymerization material can reach up to 18.12 mg g(-1), an increase of 14.02 mg g(-1) as compared with conventional hydroxyapatites. When aluminum chloride is replaced by bauxite in the study, the highest DC is 13.72 mg g(-1) due to the co-occurrence of chemical and physical combinations and relatively lower homogeneous structure caused by the co-existence of HAP and PAC while electrostatic attraction and chemical adsorption are both involved. As for the material prepared by the physical mixing method, in which the combination between HAP and PAC is mainly dominated by physical effects, its maximum DC is 13.08 mg g(-1), with physical adsorption as its main form of defluoridation.
机译：为了避免常规吸附剂的低脱氟能力，本研究提供了一种新型的共聚羟基磷灰石铝（HAP-PAC）吸附剂并评估了其在饮用水中除氟的性能，并提出了一种可能的除氟机理。通过FTIR，XRD，BET，SEM和EDS获得的表征结果。结果表明，与氯化铝共结晶制备的共聚材料的特征在于羟基磷灰石（HAP）与聚氯化铝（PAC）之间的化学结合。 HAP晶格中一定量的Ca2 +和OH-被PAC中的Al3 +和Cl-掺杂部分替代，共聚材料的结构呈现出均匀的趋势。此外，主要通过化学吸附，共聚材料的最高脱氟能力（DC）可达18.12 mg g（-1），与常规羟基磷灰石相比增加了14.02 mg g（-1）。在研究中用铝土矿代替氯化铝时，由于化学和物理组合的共同存在，以及由HAP和PAC并存而静电引起的相对较低的均匀结构，因此最高DC为13.72 mg g（-1）吸引和化学吸附都涉及。对于通过物理混合法制备的材料，其中HAP和PAC之间的结合主要受物理效应的影响，其最大DC为13.08 mg g（-1），而物理吸附是其主要的脱氟形式。

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