One-step self-assembly of Fe-biochar composite for enhanced persulfate activation to phenol degradation: Different active sites-induced radical/non-radical mechanism
One-step self-assembly of Fe-biochar composite for enhanced persulfate activation to phenol degradation: Different active sites-induced radical/non-radical mechanism
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DOI：
10.1016/j.chemosphere.2023.138168
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发表时间：
2023-02-20
期刊：
影响因子：
8.8
通讯作者：
Zhang, Ying
中科院分区：
文献类型：
--
作者：
Cao, Bo;Qu, Jianhua;Zhang, Ying
纳米零价铁（nZVI）活化过硫酸盐（PS）具有良好的净水效果，但因其易团聚和氧化而受到限制。本文采用一步碳热还原法合成了碳基壳层包覆的nZVI。核壳结构有效地抑制了nZVI核的氧化和团聚，石墨化的多孔结构促进了苯酚的吸附，nZVI（0.6）-BC 800的最大吸附容量为117.10 mg/g。反应过程中活性氧（SO 4中心点-、中心点-OH、O-2（中心点-）和O-1（2））的迁移过程均导致苯酚的分解。nZVI（0.6）-BC 800/PS体系具有多样的活性中心，能在较短时间内完全降解苯酚，对pH范围（3.0-9.0）和共存物质具有较强的适应性。此外，nZVI（0.6）-BC 800/PS体系在储存3个周期或50 d后仍能保持85%以上的苯酚去除率，对不同的水环境都具有高效性，从而提出了具有水处理潜力的铁碳催化剂的合理设计。
Persulfate (PS) activation by nanoscale zerovalent iron (nZVI) is promising for water purification, while is limited due to its easy agglomeration and oxidation. Herein, nZVI encapsuled in carbon matrix shell was synthesized via one-step carbothermal reduction. The core-shell structure effectively inhibited oxidation and agglomeration of nZVI core, and graphitized porous structures facilitated phenol binding with maximal adsorption capacity of 117.10 mg/g achieved by nZVI(0.6)-BC800. Both reactive oxygen species (SO4 center dot-, center dot-OH, O-2(center dot-) and O-1(2) transfer process resulted in phenol decomposition. Owing to diversified active sites, the nZVI(0.6)-BC800/PS system could completely degrade phenol degradation within short time, and exhibited great adaptation to extensive pH range (3.0-9.0) and coexisting substances. Additionally, the nZVI(0.6)-BC800/PS system could maintain over 85% removal of phenol after three recycles or 50 days of storage, and was highly-efficient to different water environments, thus proposing rational design of iron-carbon catalyst with potential in water treatment.