Highly efficient and stable Fe2O3/g-C3N4/GO nanocomposite with Z-scheme electron transfer pathway: Role of photocatalytic activity and adsorption isotherm of organic pollutants in wastewater
Highly efficient and stable Fe2O3/g-C3N4/GO nanocomposite with Z-scheme electron transfer pathway: Role of photocatalytic activity and adsorption isotherm of organic pollutants in wastewater
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DOI：
10.1016/j.apsusc.2022.154604
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发表时间：
2022-08-23
影响因子：
6.7
通讯作者：
Muneer, Mohammad
中科院分区：
文献类型：
--
作者：
Danish, Mohtaram;Athar, Mohammad Saud;Muneer, Mohammad
在这项工作中，我们使用了赤铁矿氧化铁（Fe 2 O3），石墨碳氮化物（g-C3 N4），和氧化石墨烯（GO）设计了高效的可见光活性三元纳米复合材料，用于排除水体系中的有机污染物。对10wt%Fe2O3/g-C3 N4/GO（10 FGG）纳米复合材料在连续4次循环前后的重复使用性测试和粉末X射线衍射（XRD）分析表明，合成的光催化剂具有令人印象深刻的稳定性。X射线光电子能谱（XPS）和能量色散X射线（EDX）分析表明，存在的所有元素的复合材料中没有任何杂质。其中，10 FGG纳米复合材料对罗丹明B（RhB）、亚甲基蓝（MB）和3-甲基-4-硝基苯酚的光催化降解效果最好。高效液相色谱（HPLC）分析表明，3-甲基-4-硝基苯酚转化为3-甲基-4-氨基苯酚作为中间产物之一，然后在可见光照射下完全降解。对苯二甲酸在氢氧化钠溶液中的光致发光（TA-PL）实验和氮蓝四唑（NBT）在水中的光致发光实验分别揭示了羟基和超氧自由基的连续产生。10 FGG的低PL信号表明，Fe 2 O3，g-C3 N4和GO可以共同最小化电子-空穴对的复合速率，从而提高可用于光反应的载流子电荷（h（+）和e（-））的总和，证实纳米复合材料的光催化活性提高。基于所获得的数据，一个合理的Z-计划的污染物与10 FGG纳米复合材料的光降解机制已勾勒出来。
In this work, we have used a hematite ferric oxide (Fe2O3), graphitic carbon nitride (g-C3N4), and graphene oxide (GO) to design highly efficient visible light active ternary nanocomposite for the exclusion of organic contam-inants in an aqueous system. The reusability test and powder X-ray diffraction (XRD) analysis of 10 wt% Fe2O3/ g-C3N4/GO (10FGG) nanocomposite before and after four consecutive cycles run demonstrated that the syn-thesized photocatalyst has impressive stability. The X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray (EDX) analyses indicate the presence of all the elements in the composite material without any impurities. Among the synthesized materials, the photocatalytic degradation of rhodamine B (RhB), methylene blue (MB) and 3-methyl-4-nitrophenol were best achieved by 10FGG nanocomposite. High-performance liquid chromatography (HPLC) analysis showed the transformation of 3-methyl-4-nitrophenol into 3-methyl-4-amino -phenol as one of the intermediate products followed by complete degradation under visible light irradiation. The terephthalic acid photoluminescence (TA-PL) experiment in NaOH and nitroblue tetrazolium (NBT) in water reveal the continuous generation of hydroxyl and superoxide radicals, respectively. The low PL signal for 10FGG revealed that Fe2O3, g-C3N4, and GO could collectively minimize the recombination rate of electron-hole pairs and hence raise the sum of carrier charges (h(+) and e(-)) accessible for photoreactions, confirming the improved photocatalytic activity of nanocomposite. Based on the data obtained, a plausible Z-scheme photodegradation mechanism of the pollutants with 10FGG nanocomposite has been sketched out.