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Efficient adsorption of methylene blue from aqueous solution by graphene oxide modified persimmon tannins

机译：氧化石墨烯改性的柿单宁从水溶液中高效吸附亚甲基蓝

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摘要

With the rapid development of dye and textile industry, the pollution of dye wastewater has aroused widespread public concern due to the potential risk to human health. Therefore, it is of significance for the removal of dye pollutants from wastewater. In this work, a green and efficient bio-adsorbent, graphene oxide modified persimmon tannin (PT-GO), has been fabricated through glutaraldehyde crosslinking method for efficient adsorption of methylene blue (MB) from aqueous solutions. The prepared PT-GO bio-adsorbent was analyzed by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, x-ray photoelectron spectra GIPS) and Brunauer-Emmett-Teller (BET) analysis. The adsorption behavior of the VT-GO bio-adsorbent towards MB dye in a batch adsorption process was investigated. The maximum MB adsorption capacity achieved 256.58 mg g(-1) with MB concentration of 35 mg L-1 at 323 K. The Freundlich equilibrium isotherm and the pseudo-second order model fit the adsorption behavior very well. Thennodynamics data revealed that the adsorption of MB onto PT-GO bio-adsorbent was feasible, spontaneous and endothermic. Redox reactions, electrostatic interactions and pi-pi interactions dominated the adsorption of MB onto PT-GO bio-adsorbent. In addition, the regeneration of the PT-GO was efficiently achieved and MB removal efficiency remained high (88.3%) after fifth cycles. All these results indicated that PT-GO bio-adsorbent could be a promising biomass adsorbent for the removal of organic dye contaminants with non-toxic, efficient and low cost.
机译：随着染料和纺织工业的快速发展，由于对人体健康的潜在风险，染料废水的污染引起了公众的广泛关注。因此，对于从废水中去除染料污染物具有重要意义。在这项工作中，通过戊二醛交联法制备了绿色高效的生物吸附剂，氧化石墨烯改性的柿单宁（PT-GO），用于从水溶液中有效吸附亚甲基蓝（MB）。通过扫描电子显微镜（SEM），傅立叶变换红外（FTIR）光谱，X射线光电子能谱（GIPS）和Brunauer-Emmett-Teller（BET）分析来分析制备的PT-GO生物吸附剂。研究了VT-GO生物吸附剂在MB吸附过程中对MB染料的吸附行为。在323 K下MB浓度为35 mg L-1时，最大MB吸附容量达到256.58 mg g（-1）。Freundlich平衡等温线和拟二级模型很好地拟合了吸附行为。随后的动力学数据表明，MB吸附在PT-GO生物吸附剂上是可行的，自发的并且是吸热的。氧化还原反应，静电相互作用和pi-pi相互作用主导了MB在PT-GO生物吸附剂上的吸附。此外，在第五次循环后，有效地实现了PT-GO的再生，并且MB去除效率仍然很高（88.3％）。所有这些结果表明，PT-GO生物吸附剂可能是一种有前途的生物吸附剂，可以无毒，高效，低成本地去除有机染料污染物。

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