铁掺杂生物炭活化 H2O2 高效去除四环素：性能、机理和降解途径,Chinese Chemical Letters

datagrip激活 • 2024-11-03 09:29 • 阅读 7

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本研究采用简单的方法制备了新型铁掺杂生物炭（Fe-BC），并将其用作四环素（TC）降解的H 2 O 2活化剂。通常，铁负载可以提高生物炭（BC）的分离性能和反应性。在Fe-BC/H 2 O 2体系中，92%的TC在30分钟内被去除，表观速率常数( k obs )为0.155 min -1，是BC/H的23.85倍2 O 2系统（0.0065 min -1）。H 2 O 2的影响研究了 Fe-BC 用量、初始 pH 值和 TC 浓度对 TC 去除的影响。自由基猝灭和电子顺磁共振 (EPR) 测量表明，使用 Fe-BC/H 2 O 2工艺去除 TC 涉及自由基（• OH 和 O 2 -•）和非自由基途径（1 O 2和电子转移）。此外，催化剂的性能还受到催化剂上持久性自由基（PFR）和缺陷位点的影响。此外，根据LC-MS检测的中间产物提出了TC的降解途径，并评价了中间产物的生态毒性。最后，Fe-BC/H 2 O2对水生环境中的无机阴离子和天然有机物表现出高抗性。总体而言，Fe-BC 有望成为一种经济且高效的多相芬顿催化剂，用于去除废水中的有机污染物。

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Efficient removal of tetracycline by H2O2 activated with iron-doped biochar: Performance, mechanism, and degradation pathways

In this study, novel iron-doped biochar (Fe-BC) was produced using a simple method, and it was used as an H2O2 activator for tetracycline (TC) degradation. Generally, iron loading can improve the separation performance and reactivity of biochar (BC). In the Fe-BC/H2O2 system, 92% of the TC was removed within 30 min with the apparent rate constant (kobs) of 0.155 min−1, which was 23.85 times that in the case of the BC/H2O2 system (0.0065 min−1). The effects of the H2O2 and Fe-BC dosage, initial pH, and TC concentration on the TC removal were investigated. The radical quenching and electron paramagnetic resonance (EPR) measurements demonstrated that the removal of TC using the Fe-BC/H2O2 process involved both radical (•OH and O2−•) and non-radical pathways (1O2 and electron transfer). In addition, the performance of the catalyst was also affected by the persistent free radicals (PFRs) and defective sites on the catalyst. Moreover, the degradation pathways of TC were proposed according to the intermediate products detected by LC-MS and the ecotoxicity of intermediates was evaluated. Finally, the Fe-BC/H2O2 showed high resistance to inorganic anions and natural organic matter in aquatic environments. Overall, Fe-BC is expected to be an economic and highly efficient heterogeneous Fenton catalyst for removing the organic contaminants in wastewater.

铁掺杂生物炭活化 H2O2 高效去除四环素：性能、机理和降解途径,Chinese Chemical Letters

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