氧化石墨烯片的制备及其去除纺织废水中混合染料的研究

IF 0.9 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES
M. Alam, Sadit Bihongo Malitha, Khandoker Foisal Azam, Mahafuga Akter, Rupna Akther Putul
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引用次数: 0

摘要

以廉价石墨粉为原料合成了二维氧化石墨烯(GO)薄片,并用FTIR、XRD和SEM对其进行了表征。用FTIR研究了不同官能团的存在。SEM图像显示氧化石墨烯片层状结构,表面粗糙。用XRD验证了氧化导致层间间距增大。采用BET分析法测量了比表面积、总孔隙体积、骨架密度、基于骨架密度的孔隙率和平均孔径。用合成的氧化石墨烯(GO)去除水体系中的纺织染料dor丙烯酸蓝MD (DBMD)。最高吸附量为848.81 mg/gm。氧化石墨烯和染料主要通过强烈的静电吸引相互作用。对pH、投加量、染液起始浓度、接触时间等实验变量的影响进行了详细研究。利用Langmuir吸附等温线和Freundlich吸附等温线分析了吸附染料分子在吸附剂表面的分布。对吸附过程进行了拟一级和拟二级反应动力学测试。吸附数据最符合Langmuir模型,符合拟二级反应动力学。理论最大吸附量为714.29 mg/gm,由Langmuir模型确定。使用过的吸附剂经2%盐酸溶液反复洗涤再生后,吸附容量略有下降。氧化石墨烯具有较高的吸附能力和可回收性,是一种很有前途的处理有机染料污染废水的吸收剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
FACILE PREPARATION OF GRAPHENE OXIDE SHEETS FOR THE REMOVAL OF MIXED TEXTILE DORACRYL BLUE MD DYE FROM WASTEWATER
2D Graphene oxide (GO) sheets were synthesized from inexpensive graphite powder and characterized by means of FTIR, XRD and SEM analysis. Presence of different functional groups was studied using FTIR. SEM image revealed the layered structure of GO sheets and a rough surface. XRD was used to verify the increase of interlayer spacing due to oxidation. Specific surface area, total pore volume, skeletal density, porosity based on skeletal density and average pore diameter were measured using BET analysis. Synthesized GO was used to remove textile dye Doracryl Blue MD (DBMD) from the aqueous system. Highest adsorption capacity was found at 848.81 mg/gm. Graphene oxide and the dye mostly interact through a strong electrostatic attraction. A number of experimental variables such as effect of pH, dosage, commencing concentration of dye solution and duration of contact was studied in detail. Distribution of adsorbate dye molecules over the adsorbent surface was analyzed using Langmuir and Freundlich adsorption isotherms. Pseudo-first-order and pseudo-second-order reaction kinetics were both tested for the adsorption process. Adsorption data fitted the Langmuir model best and followed pseudo-second-order reaction kinetics. Theoretical maximum adsorption capacity was 714.29 mg/gm, which was determined using the Langmuir model. A small loss in adsorption capacity was observed after regenerating the used adsorbents by repeatedly washing them with 2% HCl solution. Based on its increased adsorption capacity and recyclability, GO was found to be a promising absorbent for treating wastewater contaminated with organic dyes.
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来源期刊
CiteScore
1.60
自引率
36.40%
发文量
0
审稿时长
8.6 months
期刊介绍: Environmental Engineering and Management Journal is an international journal that publishes reviewed original research papers of both experimental and theoretical nature in the following areas: environmental impact assessment; environmental integrated management; risk assessment and management; environmental chemistry; environmental protection technologies (water, air, soil); pollution reduction at source and waste minimization; chemical and biological process engineering; cleaner production, products and services; sensors in environment control; sources of radiation and protection technologies; waste valorization technologies and management; environmental biotechnology; energy and environment; modelling, simulation and optimization for environmental protection; technologies for drinking and industrial water; life cycle assessments of products; environmental strategies and policies; cost-profitt analysis in environmental protection; eco-industry and environmental market; environmental education and sustainable development. Environmental Engineering and Management Journal will publish: original communications describing important new discoveries or further developments in the above-mentioned topics; reviews, mainly of new rapidly developing areas of environmental protection; special themed issues on relevant topics; advertising.
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