Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.
Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.
J Hazard Mater. 2019 Jul 5;373:39-49. doi: 10.1016/j.jhazmat.2019.03.056. Epub 2019 Mar 15.
Lead pollution in industrial-derived water has become an increasingly serious concern. The development of adsorbents with excellent efficiency, selectivity and separability using diverse microorganisms is ideal for treating lead pollution. In this study, gram-negative bacteria Pseudomonas putida I3, gram-positive bacteria Microbacterium sp. OLJ1 and mycelial fungus Talaromyces amestolkiae Pb served as raw materials to facilely synthesize sponge-like biosorbents via a one-step method at room temperature. SEM, EDS, FTIR, C NMR, XRD and XPS were used for investigating the morphology and surface properties of these three biosorbents. The obtained biosorbents possessed the same three-dimensional porous structure but different productivities and mechanical strengths due to the similar chemical compositions and different cell structures of their microorganisms. Pb(II) adsorption on X-PI3, X-OLJ1 and X-TPb was fast and pH dependent, with maximal adsorption capacities of 345.02, 237.02 and 199.02 mg/g, respectively. The biosorbents had a high selectivity for Pb(II), while Pb(II) remarkably suppressed the adsorption of co-existing heavy metal ions. The analyses indicated that Pb(II) removal was mainly achieved by ion exchange reactions, surface complexation with heteroatom-containing functional groups and microprecipitation. The treatment effects of synthetic and real wastewater revealed that the as-prepared biosorbents are promising for Pb(II) removal.
工业废水中的铅污染已成为一个日益严重的问题。利用各种微生物开发高效、选择性和可分离性的吸附剂，是处理铅污染的理想方法。在这项研究中，革兰氏阴性菌恶臭假单胞菌 I3、革兰氏阳性菌微杆菌 OLJ1 和丝状真菌塔宾曲霉 Pb 被用作原料，通过一步法在室温下简便地合成了海绵状生物吸附剂。SEM、EDS、FTIR、C NMR、XRD 和 XPS 用于研究这三种生物吸附剂的形态和表面性质。由于其微生物具有相似的化学成分和不同的细胞结构，因此所得生物吸附剂具有相同的三维多孔结构，但产量和机械强度不同。X-PI3、X-OLJ1 和 X-TPb 对 Pb(II)的吸附快速且依赖于 pH 值，最大吸附容量分别为 345.02、237.02 和 199.02 mg/g。这些生物吸附剂对 Pb(II)具有高选择性，而 Pb(II)显著抑制了共存重金属离子的吸附。分析表明，Pb(II)的去除主要通过离子交换反应、含杂原子功能基团的表面络合和微沉淀来实现。对合成废水和实际废水的处理效果表明，所制备的生物吸附剂在去除 Pb(II)方面具有广阔的应用前景。
