Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
College of Natural and Health Sciences, Zayed University, P.O. Box 144534, Abu Dhabi, United Arab Emirates.
Int J Biol Macromol. 2018 Dec;120(Pt B):1752-1759. doi: 10.1016/j.ijbiomac.2018.09.190. Epub 2018 Sep 30.
In the present study, the potential of synthesized chitosan/Ag-substituted hydroxyapatite nanocomposite beads to remove basic dye, heavy metal and microbes from aqueous solutions was investigated. Beads were prepared in different ratios via embedding of Ag-hydroxyapatite (Ag-HA) into chitosan (CS) solution. The beads were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) in order to get an insight of the functional groups and morphology. Batch adsorption studies were conducted with copper ions (Cu (II)) and rhodamine B (RhB) dye by changing several parameters such as Ag-HA to Cs ratio, contact time, solution pH and initial concentration of pollutants. The antibacterial efficiency of beads was tested under dynamic contact conditions against commonly found bacteria in water, Escherichia coli. The adsorption isotherm data were best fitted with Langmuir model. The maximum Langmuir adsorption capabilities for Cu (II) ions and rhodamine B were found to be 40.11 mg/g and 127.61 mg/g, respectively. The adsorption process could be best described by pseudo-second-order kinetic model for both rhodamine B and Cu(II). The percentage removal efficiency of Cu (II) and rhodamine B from tap water and untreated river water ranged from 86.7 to 94.4% along with 99.99% of decontamination of microbial load.
在本研究中，研究了合成的壳聚糖/Ag 取代羟基磷灰石纳米复合材料珠用于从水溶液中去除碱性染料、重金属和微生物的潜力。通过将 Ag-羟基磷灰石 (Ag-HA) 嵌入壳聚糖 (CS) 溶液中，以不同比例制备了珠。通过傅里叶变换红外光谱 (FT-IR) 和扫描电子显微镜 (SEM) 对珠进行了表征，以便深入了解官能团和形态。通过改变 Ag-HA 与 Cs 的比例、接触时间、溶液 pH 值和污染物初始浓度等参数，进行了铜离子 (Cu(II)) 和罗丹明 B (RhB) 染料的批处理吸附研究。在动态接触条件下，以水中常见的细菌大肠杆菌为例，测试了珠的抗菌效率。吸附等温线数据最好用 Langmuir 模型拟合。发现 Cu(II)离子和罗丹明 B 的最大 Langmuir 吸附能力分别为 40.11mg/g 和 127.61mg/g。对于罗丹明 B 和 Cu(II)，吸附过程最符合伪二阶动力学模型。从自来水和未经处理的河水去除 Cu(II)和罗丹明 B 的去除效率百分比范围为 86.7%至 94.4%，同时微生物负荷的去除率达到 99.99%。
