Construction of novel dual Z-scheme g-C3N4/ZnFe2O4/Ag2CO3 heterojunction with enhanced visible-light-driven performance for tetracycline degradation and bacterial inactivation
Construction of novel dual Z-scheme g-C3N4/ZnFe2O4/Ag2CO3 heterojunction with enhanced visible-light-driven performance for tetracycline degradation and bacterial inactivation
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DOI：
10.1016/j.jece.2023.111421
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发表时间：
2023-12
影响因子：
7.7
通讯作者：
Wenxia Wang;Zhen Li;Han Wang;Hangyu Luo;Zhenbang Meng;Xiaofeng Liu;Lingyu Liu;Weirui Chen-Weirui-Che
中科院分区：
文献类型：
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作者：
Wenxia Wang;Zhen Li;Han Wang;Hangyu Luo;Zhenbang Meng;Xiaofeng Liu;Lingyu Liu;Weirui Chen-Weirui-Che
双Z型异质结具有光生载流子的高效分离和优异的氧化还原性能，在环境修复方面具有广阔的应用前景。本文成功构建了磁性双Z结构g-C3 N4/ZnFe 2 O 4/Ag 2CO 3异质结，并将其作为四环素降解和细菌灭活的双功能光催化剂。优化后的g-C3 N4/ZnFe 2 O 4/Ag 2CO 3异质结具有优异的光催化降解TC的能力，其速率常数为0.0154 min-1，分别是g-C3 N4、ZnFe 2 O 4和g-C3 N4/ZnFe 2 O 4的2.73、3.08和2.92倍。令人印象深刻的是，g-C3 N4/ZnFe 2 O 4/Ag 2CO 3 -1.25异质结在较宽的pH（3.0-9.0）、TC浓度（5-25 mg L−1）范围内以及添加各种阴离子（包括Cl-、HCO 3-、SO 42-和NO3-）时显示出令人满意的活性。同时，g-C_3 N_4/ZnFe_2O_4/Ag_2CO_3 -1.25异质结在可见光下也能灭活6.5-log的大肠杆菌细胞。基于捕集实验、电子顺磁共振（EPR）分析和液相色谱-质谱（LC-MS）分析的机理探讨表明，半导体的协同效应和双Z结构异质结的形成，显著提高了电荷分离速率，赋予了较强的氧化还原能力。正如预期的那样，根据基于定量构效关系（QSAR）方法的毒性估计分析，TC降解中间体的毒性降低。此外，g-C3 N4/ZnFe 2 O 4/Ag 2CO 3异质结即使在4次循环后也表现出磁分离性能和令人满意的光催化稳定性。该工作为构建具有双功能光催化性能的磁性双Z结构异质结提供了新的视角，对水污染治理具有重要意义。
Dual Z-scheme heterojunction with highly separation efficiency of photoinduced carriers and outstanding redox capability has received considerable attention and hold great promise for environmental remediation. Herein, magnetic dual Z-scheme g-C3N4/ZnFe2O4/Ag2CO3heterojunction was successfully constructed, and applied as a dual-function photocatalyst for tetracycline (TC) degradation and bacterial inactivation. The optimized g-C3N4/ZnFe2O4/Ag2CO3heterojunction exhibited excellent photocatalytic capacity for TC degradation with a rate constant of 0.0154 min−1, which is 2.73, 3.08, and 2.92 times higher compared to that of the g-C3N4, ZnFe2O4, and g-C3N4/ZnFe2O4, respectively. Impressively, the g-C3N4/ZnFe2O4/Ag2CO3-1.25 heterojunction displayed satisfying activity within a wider range of pH (3.0–9.0), TC concentration (5–25 mg L−1), and with the addition of various anions including Cl-, HCO3-, SO42-, and NO3-. Meanwhile, 6.5-log ofEscherichia colicells could also be inactivated by g-C3N4/ZnFe2O4/Ag2CO3-1.25 heterojunction under visible light. Mechanism exploration based on trapping experiment, electron paramagnetic resonance (EPR) analysis, and liquid chromatography-mass spectrometer (LC-MS) indicated that the improved photocatalytic performance resulted from the synergetic effect of semiconductors and constructed dual Z-scheme heterojunction, which significantly promotes charge separation rate and endows strong redox capacity. As expected, the toxicity of TC degradation intermediates was reduced according to the Toxicity estimation analysis based on a quantitative structure activity relationships (QSAR) method. Further, the g-C3N4/ZnFe2O4/Ag2CO3heterojunction also demonstrated magnetic separation property and satisfactory photocatalytic stability even after 4 cycles. This work offers a new perspective on constructing novel magnetic dual Z-scheme heterojunction with dual-function photocatalytic properties and is of significance for water remediation.