Preparation of nZVI embedded modified mesoporous carbon for catalytic persulfate to degradation of reactive black 5
Preparation of nZVI embedded modified mesoporous carbon for catalytic persulfate to degradation of reactive black 5
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nZVI嵌入改性介孔碳的制备用于催化过硫酸盐降解活性黑5
DOI：
10.1007/s11783-020-1372-4
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发表时间：
2021-01
影响因子：
6.4
通讯作者：
Wu Daishe
中科院分区：
文献类型：
--
作者：
Ma Zhifei;Cao Huali;Lv Fengchun;Yang Yu;Chen Chen;Yang Tianxue;Zheng Haixin;Wu Daishe
在环境修复和保护领域，高效、经济的过硫酸盐（PS）活化催化剂是有机污染物完全矿化的关键。采用水热合成法和高温热解法合成了具有核壳结构的纳米级零价铁嵌入改性介孔碳（MCNZVI）。结果表明，纳米ZVI可以浸渍在石墨化度较高、氮掺杂量丰富、比表面积和孔容较大的介孔碳骨架中。该材料用作过硫酸盐活化剂，用于氧化去除活性黑5（RB 5）。研究了材料用量、PS浓度、pH值和一些无机阴离子（即，Cl-、SO 42-）对RB 5降解的影响。当PS（20 mmol/L）被MCNZVI（0.5 g/L）活化时，RB 5的降解率最高（97.3%）。在MCNZVI/PS（0.5 g/L，20 mmol/L）体系中的准一级动力学（k= 2.11 × 10− 2 min −1）是MCNZVI和PS体系的100倍以上。活性氧（ROS），包括1 O2、SO 4·−、HO.和·O2-通过用MCNZVI活化PS产生。单线态氧被证明是负责RB 5降解的主要ROS。MCNZVI可以重复使用和再生以进行回收。这项工作为PS活化去除有机污染物提供了新的见解。
High-efficiency and cost-effective catalysts with available strategies for persulfate (PS) activation are critical for the complete mineralization of organic contaminants in the environmental remediation and protection fields. A nanoscale zero-valent iron-embedded modified mesoporous carbon (MCNZVI) with a core-shell structure is synthesized using the hydrothermal synthesis method and high-temperature pyrolysis. The results showed that nZVI could be impregnated within mesoporous carbon frameworks with a comparatively high graphitization degree, rich nitrogen doping content, and a large surface area and pore volume. This material was used as a persulfate activator for the oxidation removal of Reactive Black 5 (RB5). The effects of the material dosage, PS concentration, pH, and some inorganic anions (i.e., Cl−, SO42−) on RB5 degradation were then investigated. The highest degradation efficiency (97.3%) of RB5 was achieved via PS (20 mmol/L) activation by the MCNZVI (0.5 g/L). The pseudo-first-order kinetics (k= 2.11 × 10−2min−1) in the MCNZVI/PS (0.5 g/L, 20 mmol/L) was greater than 100 times than that in the MCNZVI and PS. The reactive oxygen species (ROS), including1O2, SO4·−, HO., and ·O2−, were generated by PS activation with the MCNZVI. Singlet oxygen was demonstrated to be the primary ROS responsible for the RB5 degradation. The MCNZVI could be reused and regenerated for recycling. This work provides new insights into PS activation to remove organic contamination.
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