Abdelwahab Mohamed S, El Halfawy Nancy M, El-Naggar Moustafa Y
Faculty of Education, Physics and Chemistry Department, Matrouh University, Mersa Matruh, Egypt.
Botany and Microbiology Department, Faculty of Science, Alexandria University, Egypt.
Int J Biol Macromol. 2022 May 1;206:730-739. doi: 10.1016/j.ijbiomac.2022.03.053. Epub 2022 Mar 14.
Biochar is one of the most promising wastewater treatment materials. As shown in the Scanning Electron Micrograph, the magnetic biochar (BC) cross-linked glutaraldehyde (G) with sodium alginate (SA) (BC-G-SA) nanocomposite formed with uniform particle size without aggregation, and an X-Ray Diffraction study revealed that the BC-G-SA nanocomposite has an amorphous structure. The BC-G-SA nanocomposite enhanced the microwave adsorption process for Pb (II). The maximum metal capacity value was obtained using the microwave adsorption technique at pH 5.0 and contact time 20 s for Pb (II) at medium and low microwave power (940 and 1400 μmol g, respectively). Pb (II) adsorption isotherm follows a pseudo-second-order model. Also, the BC-G-SA nanocomposite effectively inhibited bacterial growth throughout the growth kinetics experiment. BC-G-SA inhibited the growth of S. aureus at a MIC of 200 g mL, whereas L. monocytogenes had a MIC of 200 g mL. The MIC values for E. faecalis and E. faecium were significantly lower (50 and 100 g mL, respectively).
生物炭是最具前景的废水处理材料之一。如扫描电子显微镜照片所示，磁性生物炭（BC）与戊二醛（G）和海藻酸钠（SA）交联形成的（BC-G-SA）纳米复合材料粒径均匀，无团聚现象，X射线衍射研究表明BC-G-SA纳米复合材料具有非晶结构。BC-G-SA纳米复合材料增强了对Pb（II）的微波吸附过程。在中低微波功率（分别为940和1400μmol g）下，采用微波吸附技术在pH 5.0和接触时间20 s时获得了Pb（II）的最大金属容量值。Pb（II）吸附等温线符合准二级模型。此外，在整个生长动力学实验中，BC-G-SA纳米复合材料有效地抑制了细菌生长。BC-G-SA在200 g mL的最低抑菌浓度下抑制了金黄色葡萄球菌的生长，而单核细胞增生李斯特菌的最低抑菌浓度为200 g mL。粪肠球菌和屎肠球菌的最低抑菌浓度值显著更低（分别为50和100 g mL）。
