【摘要】：本課題制備了純的及氟摻雜的羥基磷灰石(HA及FHA)粉體和多孔球體環(huán)境功能材料,并研究了其對鈾(UO22+)的吸附性能。主要研究內(nèi)容如下:首先,以Ca(NO3)2?4H2O、(NH4)2HPO4和NaF為原料,通過水熱法和濕化學(xué)沉淀法制備了納米HA及FHA粉體。水熱法制備過程考察了pH、時間、溫度及氟含量對HA形貌、晶粒大小、物相和純度的影響。結(jié)果表明,pH=10,溫度為140℃,水熱時間4h下可合成納米棒狀HA。氟摻雜可使HA的形貌從棒狀轉(zhuǎn)化為球狀顆粒,結(jié)晶性增強;濕化學(xué)沉淀法制得HA及FHA樣品過程中,考察了氟摻雜對HA的耐酸性及熱穩(wěn)定性影響。結(jié)果表明:FHA93和FHA200的耐酸性及熱穩(wěn)定性均優(yōu)于HA。其次,采用溶膠凝膠和致孔劑相結(jié)合的方法制備多孔HA及FHA球體材料。結(jié)果表明,石蠟微球用量:HA粉料用量=1:1時,多孔球體的孔洞分布均勻,孔徑在100~200μm,抗壓強度相對較大。另外抗壓強度隨著氟摻雜量增加而增強。最后,兩種類型的吸附劑(粉體、多孔球體的HA或FHA)對UO22+的吸附性能相當(dāng)。粉體材料HA、FHA93和FHA200對UO22+的最大吸附量分別為1792mg/g、1752mg/g和1705mg/g;在鈾模擬廢液pH=4的條件下,多孔球體HA、FHA93和FHA200對UO22+的去除率可分別達到98.5%、98.0%、97.6%。經(jīng)比較,FHA多孔球體材料更適合應(yīng)用在工業(yè)吸附上。
[Abstract]:In this paper, pure and fluorine-doped hydroxyapatite (HA and FHA) powders and porous spherical environmental functional materials were prepared and their adsorption properties for uranium (UO22) were studied. The main contents are as follows: firstly, Ca (NO3) 2H 2O, (NH4) 2HPO4 and NaF were used as raw materials to prepare nano-HA and FHA powders by hydrothermal method and wet chemical precipitation method. The effects of pH, time, temperature and fluorine content on the morphology, grain size, phase and purity of HA were investigated by hydrothermal method. The results show that nanorods HA. can be synthesized at pH=10, temperature 140 鈩，

本文編號：2397027