Visible light photocatalytic reduction of toxic chemical organophosphate monocrotophos using reduced graphene oxide derived from bamboo leaves

Pukrambam Dipak, UPS Gahlaut, Y.C. Goswami
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Abstract

In this study, graphene oxide (GO) was synthesized from waste bamboo leaves using a pyrolysis and ultra-sonication technique. UV–visible spectroscopy revealed a prominent absorption peak at 230 nm, while Raman spectroscopy confirmed the presence of characteristic D-band (1340 cm⁻¹) and G-band (1596 cm⁻¹). XRD analysis showed a peak at 11.5°, corresponding to a lattice spacing of 3 nm, and SEM/TEM imaging demonstrated the formation of multi-layered graphene sheets. The synthesized GO was evaluated for the photocatalytic degradation of the organophosphate pesticide monocrotophos under visible light. At a concentration of 25 mg/L, graphene exhibited a removal efficiency of 98 % with a degradation rate of 0.036 ppm/min, following a Langmuir isotherm and pseudo-first-order kinetic model. The significance of this study lies in the potential environmental application, offering an economical and sustainable solution for the decontamination of pesticide-contaminated water sources. The method could contribute significantly for reducing environmental pollution and addressing global water safety challenges.
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利用从竹叶中提取的还原氧化石墨烯在可见光下光催化还原有毒化学品有机磷久效磷
本研究采用热解和超声波技术从废弃竹叶中合成了氧化石墨烯(GO)。紫外-可见光谱显示了 230 纳米处的显著吸收峰,拉曼光谱则证实了 D 波段(1340 厘米-¹)和 G 波段(1596 厘米-¹)的存在。XRD 分析表明在 11.5° 处有一个峰值,相当于 3 纳米的晶格间距,SEM/TEM 成像显示形成了多层石墨烯薄片。对合成的 GO 在可见光下光催化降解有机磷农药久效磷的效果进行了评估。在浓度为 25 mg/L 时,石墨烯的去除率为 98%,降解速率为 0.036 ppm/min,遵循朗缪尔等温线和伪一阶动力学模型。这项研究的意义在于其潜在的环境应用价值,它为净化受农药污染的水源提供了一种经济、可持续的解决方案。该方法可为减少环境污染和应对全球水安全挑战做出重大贡献。
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