Mensah Alfred, Lv Pengfei, Narh Christopher, Huang Jieyu, Wang Di, Wei Qufu
Key Laboratory of Eco-textiles, Ministry of Education, College of Textiles and Clothing, Jiangnan University, Wuxi 214122, China.
Materials (Basel). 2019 Jan 10;12(2):218. doi: 10.3390/ma12020218.
In this study, a novel green adsorbent material prepared by the esterification of bacterial cellulose (BC) and graphene oxide (GO), richly containing hydroxyl, alkyl, and carboxylate groups was characterised by FTIR (Fourier Transform infrared spectroscopy), XRD (X-ray diffraction), SEM (Scanning electron microscopy) and TGA (Thermo-graphimetric analysis). The specific surface area (SSA) and pore size distribution (PSD) analysis of materials were also analysed. Batch experiments⁻adsorption studies confirmed the material to have a very high Pb removal efficiency of over 90% at pH 6⁻8. Kinetic studies showed that the uptake of metal ions was rapid with equilibrium attained after 30 min and fitted well with the pseudo-second-order rate model (PSO). Isotherm results with a maximum adsorption capacity (Q) of 303.03 mg/g were well described by Langmuir's model compared to Freundlich. Desorption and re-adsorption experiments realised that both adsorbent and adsorbates could be over 90⁻95% efficiently recovered and reused using 0.1 M HNO₃ and 0.1 M HCl.
在本研究中，通过细菌纤维素（BC）与氧化石墨烯（GO）酯化制备的一种新型绿色吸附材料，富含羟基、烷基和羧酸盐基团，采用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）和热重分析（TGA）对其进行了表征。还对材料的比表面积（SSA）和孔径分布（PSD）进行了分析。批量实验——吸附研究证实，该材料在pH值为6至8时对铅的去除效率非常高，超过90%。动力学研究表明，金属离子的吸收迅速，30分钟后达到平衡，并且与伪二级速率模型（PSO）拟合良好。与弗伦德利希等温线相比，朗缪尔模型能很好地描述最大吸附容量（Q）为303.03 mg/g的等温线结果。解吸和再吸附实验表明，使用0.1 M硝酸和0.1 M盐酸，吸附剂和被吸附物都能以超过90%至95%的效率有效回收和再利用。
