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Multiple coated graphite oxide – sand composites for fluoride removal in water
Journal of Environmental Chemical Engineering ( IF 7.4 ) Pub Date : 2021-01-09 , DOI: 10.1016/j.jece.2020.104962
A.R. Kumarasinghe , W.P.R.T. Perera , J. Bandara , R. Pathmanadan , L. Jayarathe , J.A. Liyanage , R. Tennakone , A. Bandara , Xing CHEN , Rohan Weerasooriya

In drinking water treatment, sand filters are frequently used to remove turbidity. We enhanced the performance of the sand by a chemical modification using graphite oxide (GO). Repeated coating of sand granules with graphite oxide (GO) followed by low temperature (120 °C) pyrolysis yielded hierarchical core-shell structures. The sand granules can be coated with GO in a single (hereafter S-GO1) or multiple (presently five cycles, hereafter S-GO5) coating steps. The GO coated sand composites were characterized using spectroscopic, microscopic, and conventional techniques. When compared to S-GO1, the GO coatings on S-GO5 show enhanced stability in contact with water. The S-GO5 removes over 70% fluoride around pH 6.30 ± 0.02 according to Hill adsorption model. We also used a simulated water sample to assess the efficacy of sand/GO composites to remove fluoride and turbidity. When S-GO5 is used, the solution turbidity has reduced by 87% (from 0.08 to 0.01 NTU). However, in the presence of S-GO1, the turbidity has increased by + 75% (from 0.08 to 0.14 NTU). The gradual dissolution of adhered GO on S-GO1 enhanced the turbidity of treated water. The S-GO5 can be used to regulate excess fluoride and turbidity in water, simultaneously.



中文翻译:

多层涂覆的氧化石墨–砂复合物,用于去除水中的氟化物

在饮用水处理中,经常使用砂滤器去除浑浊。通过使用氧化石墨(GO)进行化学改性,我们提高了沙子的性能。用氧化石墨(GO)重复涂覆砂粒,然后进行低温(120°C)热解,得到分层的核-壳结构。可以在单个(以下为S-GO1)或多个(目前为五个循环,以下为S-GO5)涂覆步骤中用GO涂覆砂粒。使用光谱,显微镜和常规技术对GO涂层砂复合材料进行了表征。与S-GO1相比,S-GO5上的GO涂层在与水接触时表现出更高的稳定性。根据Hill吸附模型,S-GO5去除pH值为6.30±0.02时超过70%的氟化物。我们还使用了模拟水样来评估砂/ GO复合材料去除氟化物和浊度的功效。使用S-GO5时,溶液的浊度降低了87%(从0.08降低到0.01 NTU)。但是,在存在S-GO1的情况下,浊度增加了+ 75%(从0.08 NTU到0.14 NTU)。附着的GO在S-GO1上的逐渐溶解增强了处理水的浊度。S-GO5可用于同时调节水中的过量氟化物和浊度

更新日期:2021-01-22
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