Guangdong Institute of Microbiology, State Key Laboratory of Applied Microbiology Southern China, 510070, Guangzhou, P.R. China.
Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Open Laboratory of Applied Microbiology, 510070, Guangzhou, P.R. China.
Sci Rep. 2019 Mar 6;9(1):3687. doi: 10.1038/s41598-018-37470-1.
In this study, nanoiron active carbon composites (NZVI/GAC) were used to remove chromium ions from raw water. The composites were synthesized from a novel formula of biological activated carbon and characterized by various techniques. The adsorption test data were fit by a pseudo-second-order kinetic model and Langmuir model. The q and R values were 187 mg Cr/g and 0.9960, respectively, with 0.2 g/L NZVI/GAC at an initial concentration of 118 mg/L Cr according to the Langmuir isotherm model. Moreover, a Cr detoxification reactor was constructed with the magnetic iron composite. The results indicated that the synthesized magnetic iron composite was a significant adsorbent for Cr removal from aqueous solutions. The detoxification reactor was able to remove Cr from raw water at an initial concentration of 26.5 mg/L within a short time period (3-5 min), with a removal efficiency of up to 99.90% and a treatment capacity of 45.0 mg Cr/g of adsorbent; the Cr concentrations in the outflow met the GB5749-2006 requirements for drinking water. A synergistic effect between NZVI/GAC and a suspension of the bacterium Shewanella oneidensis MR-1 was found, showing that this bacterium can be used as a regeneration agent for iron-depleted activated carbon materials.
在这项研究中，纳米铁活性炭复合材料（NZVI/GAC）被用于从原水中去除铬离子。该复合材料是由一种新型的生物活性炭配方合成的，并通过各种技术进行了表征。吸附试验数据符合拟二级动力学模型和 Langmuir 模型。根据 Langmuir 等温模型，当初始浓度为 118mg/L 的 Cr 时，q 和 R 值分别为 187mg Cr/g 和 0.9960，使用 0.2g/L 的 NZVI/GAC。此外，还构建了一个带有磁性铁复合的 Cr 解毒反应器。结果表明，合成的磁性铁复合材料是一种从水溶液中去除 Cr 的有效吸附剂。解毒反应器能够在较短时间内（3-5 分钟）从初始浓度为 26.5mg/L 的原水中去除 Cr，去除效率高达 99.90%，处理能力为 45.0mg Cr/g 吸附剂；流出物中的 Cr 浓度符合 GB5749-2006 饮用水要求。NZVI/GAC 和 Shewanella oneidensis MR-1 细菌悬浮液之间存在协同效应，表明该细菌可作为铁耗尽的活性炭材料的再生剂。
