Department of Chemistry, Collage of Science, King Khalid University, Abha 61413, Saudi Arabia.
Molecules. 2019 Feb 28;24(5):847. doi: 10.3390/molecules24050847.
Nanocomposites of natural bone that show some benefits in terms of both composition and microstructure were synthesized by an in situ precipitation method. Hydroxyapatite (Hap) was prepared from cost-effective precursors within chitosan (CS) dissolved in aqueous acetic acid solution. The nanocomposite was synthesized for the removal of brilliant green dye (BG) from a contaminated water solution. The compositional and morphological properties of the nanocomposite were studied by means of FTIR spectroscopy, X-ray diffraction (XRD), SEM, and TEM analysis. Batch experiments were carried out to investigate the effects of pH, contact time, and initial concentration, as well as the adsorbent dosage and zero point charge for the sorbent to determine a suitable medium for the adsorption process. The sorption models using Mories-Weber, Lagrange, and Bangham equations were used to identify the mechanism and reaction order. The isotherm model was carried out using Langmuir, Freundlich, and Dubinin-Radusekevisch-Kanager equations to calculate the adsorption capacity and type of adsorption. Thermodynamic parameters, enthalpy change (∆H), entropy change (∆S), and Gibbs free energy (∆G) were evaluated. All of the results suggest the feasibility of using nanocomposites as a sorbent for brilliant green dye removal.
采用原位沉淀法合成了在组成和微观结构方面都具有一定优势的天然骨纳米复合材料。在溶解于乙酸水溶液中的壳聚糖（CS）中，用成本效益高的前体制备出了羟磷灰石（Hap）。该纳米复合材料是为了从受污染的水溶液中去除亮绿染料（BG）而合成的。通过傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）分析，研究了纳米复合材料的组成和形态特性。通过批次实验研究了 pH 值、接触时间、初始浓度以及吸附剂用量和零电荷点对吸附的影响，以确定吸附过程的合适介质。使用 Mories-Weber、Lagrange 和 Bangham 方程的吸附模型来确定吸附机制和反应级数。使用 Langmuir、Freundlich 和 Dubinin-Radusekevisch-Kanager 方程进行等温线模型，以计算吸附容量和吸附类型。评估了热力学参数，包括焓变（∆H）、熵变（∆S）和吉布斯自由能（∆G）。所有结果均表明，纳米复合材料作为亮绿染料去除剂具有一定的可行性。
