Engineering effective separation of photo-assisted charge carriers by provoking fenton-like reaction for degradation of rhodamine B dye

IF 7.5 Q1 CHEMISTRY, PHYSICAL
A. Rebekah , Reddyprakash Maddipatla , Chadrasekhar Loka , Sagarika Sahoo , Kee-Sun Lee
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Abstract

Developing a photocatalyst for environmental remediation with extortionate visible light absorption capability and low reunion of photogenerated charge carriers is of tremendous interest. Considering this, the present work reports the fabrication of a low-cost and eco-friendly Fe-doped WO3/BiVO4 photocatalyst prepared by the facile one-step hydrothermal technique. The photocatalyst outperformed in the removal of rhodamine B dye than the pristine samples. The XRD and Raman spectroscopy analysis affirms the successful doping of the Fe cations within the WO3 crystal structure. The absorption studies reveal the redshift to higher wavelengths which elucidates the enhancement of oxygen vacancy, and the band gap value changes are also apparent due to the heterojunction scheme of the photocatalyst. The time-resolved photoluminescence studies substantiate the effective reduction in the recombination rate with an average lifetime of 364 ns proving it to be an effective photocatalyst for the removal of rhodamine B dye. The catalyst revealed outstanding performance with 94.3 % removal of rhodamine B dye within 6 h. However, the removal efficiency was higher at pH 14 with a degradation of 92.6 % (100 min) corroborating that the influence of hydroxyl radical greatly facilitates a Fenton-like reaction that provokes the degradation process faster. It was further confirmed from the scavenging analysis that, with the addition of an H2O2 scavenger the degradation rate is fast due to the formation of hydroxyl radicals that emerged from the fusion of H2O2 with superoxide radicals. This outperformance validates the competency of the photocatalyst in the removal of organic pollutants.

Abstract Image

通过引发类似芬顿的反应,有效分离光助电荷载流子,降解罗丹明 B 染料
开发一种具有极强的可见光吸收能力和较低的光生电荷载流子重合率的用于环境修复的光催化剂具有极大的意义。有鉴于此,本研究报告采用简单的一步水热法技术制备了一种低成本、环保型掺杂铁的 WO3/BiVO4 光催化剂。该光催化剂对罗丹明 B 染料的去除效果优于原始样品。XRD 和拉曼光谱分析证实了在 WO3 晶体结构中成功掺入了铁阳离子。吸收研究揭示了向更高波长的红移,这阐明了氧空位的增强,而且由于光催化剂的异质结方案,带隙值也发生了明显变化。时间分辨光致发光研究证实,该催化剂的平均寿命为 364 ns,有效降低了重组率,证明它是去除罗丹明 B 染料的有效光催化剂。然而,在 pH 值为 14 时,去除率更高,降解率达 92.6%(100 分钟),这证实了羟基自由基的影响极大地促进了类似芬顿的反应,从而加快了降解过程。清除分析进一步证实,加入 H2O2 清除剂后,由于 H2O2 与超氧自由基融合形成羟自由基,降解速度加快。这种优异的性能验证了光催化剂在去除有机污染物方面的能力。
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来源期刊
CiteScore
8.10
自引率
1.60%
发文量
128
审稿时长
66 days
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