Wong Christelle Pau Ping, Lai Chin Wei, Lee Kian Mun, Hamid Sharifah Bee Abd
Nanotechnology & Catalysis Research Centre (NANOCAT), Level 3, Block A, IPS Building, University of Malaya (UM), Kuala Lumpur 50603, Malaysia.
Materials (Basel). 2015 Oct 19;8(10):7118-7128. doi: 10.3390/ma8105363.
Textile industries consume large volumes of water for dye processing, leading to undesirable toxic dyes in water bodies. Dyestuffs are harmful to human health and aquatic life, and such illnesses as cholera, dysentery, hepatitis A, and hinder the photosynthetic activity of aquatic plants. To overcome this environmental problem, the advanced oxidation process is a promising technique to mineralize a wide range of dyes in water systems. In this work, reduced graphene oxide (rGO) was prepared via an advanced chemical reduction route, and its photocatalytic activity was tested by photodegrading Reactive Black 5 (RB5) dye in aqueous solution. rGO was synthesized by dispersing the graphite oxide into the water to form a graphene oxide (GO) solution followed by the addition of hydrazine. Graphite oxide was prepared using a modified Hummers' method by using potassium permanganate and concentrated sulphuric acid. The resulted rGO nanoparticles were characterized using ultraviolet-visible spectrophotometry (UV-Vis), X-ray powder diffraction (XRD), Raman, and Scanning Electron Microscopy (SEM) to further investigate their chemical properties. A characteristic peak of rGO-48 h (275 cm) was observed in the UV spectrum. Further, the appearance of a broad peak (002), centred at 2θ = 24.1°, in XRD showing that graphene oxide was reduced to rGO. Based on our results, it was found that the resulted rGO-48 h nanoparticles achieved 49% photodecolorization of RB5 under UV irradiation at pH 3 in 60 min. This was attributed to the high and efficient electron transport behaviors of rGO between aromatic regions of rGO and RB5 molecules.
纺织工业在染料加工过程中消耗大量的水，导致水体中出现有害的有毒染料。染料对人类健康和水生生物有害，会引发霍乱、痢疾、甲型肝炎等疾病，并阻碍水生植物的光合作用。为了克服这一环境问题，高级氧化工艺是一种很有前景的技术，可使水系统中的多种染料矿化。在这项工作中，通过先进的化学还原路线制备了还原氧化石墨烯（rGO），并通过在水溶液中光降解活性黑5（RB5）染料来测试其光催化活性。rGO是通过将氧化石墨分散在水中形成氧化石墨烯（GO）溶液，然后加入肼合成的。氧化石墨采用改良的Hummers法，使用高锰酸钾和浓硫酸制备。使用紫外-可见分光光度法（UV-Vis）、X射线粉末衍射（XRD）、拉曼光谱和扫描电子显微镜（SEM）对所得的rGO纳米颗粒进行表征，以进一步研究其化学性质。在紫外光谱中观察到rGO-48 h的特征峰（275 cm）。此外，XRD中在2θ = 24.1°处出现一个以宽峰（002）为中心的峰，表明氧化石墨烯已还原为rGO。根据我们的结果，发现在pH值为3的条件下，所得的rGO-48 h纳米颗粒在紫外光照射60分钟后可实现RB5 49%的光脱色。这归因于rGO在rGO的芳香区域和RB5分子之间具有高效的电子传输行为。
