Iron manganese Oxide Modified Multi-walled Carbon Nanotube as Efficient Adsorbent for Removal of Organic Dyes: Performan
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Iron manganese Oxide Modified Multi‑walled Carbon Nanotube as Efficient Adsorbent for Removal of Organic Dyes: Performance, Kinetics and Mechanism Studies Tian Ma1 · Yunhai Wu1 · Ningning Liu1 · Yunying Wu2 Received: 9 March 2020 / Accepted: 16 April 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this study, iron manganese composite oxide (FeMnOx) were integrated with multi-walled carbon nanotube (MWCNTs) to synthesize an effective adsorbent for acid orange (AO) and basic violet (BV), two widely used organic dyestuffs belonging to anionic and cationic, respectively. Among all the composites evaluated, the F eMnOx-MWCNTs with Fe–Mn ratios of 1:1 and load ratio of 45% achieved superior adsorption capacity than others, and was selected as the best adsorbent. The Characterization data indicated that the physicochemical properties and structural characteristics of FeMnOx-MWCNTs have changed obviously after modification, with larger specific surface area and richer groups. The maximum adsorption capacity of AO (403.23 mg/g) and BV (165.29 mg/g) could be attained under optimal conditions: 300 min, 0.05 g adsorbent dosage, 100 mg/L dyes and pH 2.0 (for AO) or pH 10.0 (for BV). Moreover, the adsorption kinetics of the two dyes were both well fitted the pseudo-second-order kinetics model, and the adsorption isotherms agreed well with the Freundlich model for AO while Langmuir model for BV. Moreover, the FeMnOx-MWCNTs with optimal FeMnOx content showed relatively higher final adsorption amount and faster adsorption rate, thus better fitting with the kinetics. A mechanism was proposed that physical adsorption is the dominator during the process. The results indicated that the introduction of F eMnOx into the MWCNTs significantly enhanced the dye removal efficiency, providing a promising method for the improvement of carbon nanometer adsorbents.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10904-020-01552-3) contains supplementary material, which is available to authorized users. * Yunhai Wu [email protected] * Yunying Wu [email protected] 1
Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Ministry of Education, Hohai University, Xikang Road #1, Nanjing 210098, China
School of Material Science and Engineering, Hanshan Normal University, Qiaodong, Chaozhou 521041, China
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Journal of Inorganic and Organometallic Polymers and Materials
Graphic Abstract The selected graph can not only express the synthetic methods of F eMnOx-MWCNTs by chemical coprecipitation, but also presented the adsorption process and mechanism of AO and BV, which showed the purposes of this work simultaneously.
Keywords Multi-wall carbon nanotube · Iron manganese oxide · Modification · Adsorption · Organic dye
1 Introduction Dyes are one of the hazardous compound classes in industrial effluents, which are widely used in numerous industries including paper, plastics, rubber, texti
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