Novel graphene oxide/aminated lignin aerogels for enhanced adsorption of malachite green in wastewater

[Display omitted] •Graphene oxide/aminated lignin aerogels (GALA) were prepared.•The preparation process of GALA was simple and eco-friendly.•Adsorption capacity of GALA to malachite green in wastewater was up to 113.5 mg/g.•Adsorption efficiency of GALA was able to keep 89.8 % after recycling 5 tim...

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Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2020-10, Vol.603, p.125281, Article 125281
Main Authors: Chen, Hang, Liu, Tanglong, Meng, Yi, Cheng, Yi, Lu, Jie, Wang, Haisong
Format: Article
Language:English
Subjects:
Adsorption
Aminated lignin
Graphene oxide
Synergy
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Summary:[Display omitted] •Graphene oxide/aminated lignin aerogels (GALA) were prepared.•The preparation process of GALA was simple and eco-friendly.•Adsorption capacity of GALA to malachite green in wastewater was up to 113.5 mg/g.•Adsorption efficiency of GALA was able to keep 89.8 % after recycling 5 times. Biomass adsorbents applied in the removal of pollutants in wastewater treatment has become a trend. Herein, only 0.1 % graphene oxide was used to modify the aminated lignin aerogels and applied in the removal of dyes. The adsorption capacity of graphene oxide/aminated lignin aerogels (GALA) to malachite green (MG) was compared with different composition, pH, aerogels dosage, reaction temperature and contacting time. The experimental results indicated that the maximum adsorption capacity and efficiency could reach to 113.5 mg/g and 91.72 % under the optimal conditions. Compared to other aerogels in this experiment, the adsorption performance of GALA was significantly improved due to the synergy between the carboxyl group on the surface of graphene oxide and the amine of aminated lignin. Additionally, the fitting results of adsorption isotherm models and adsorption kinetic models conformed to the Langmuir and pseudo-second-order models, respectively. Furthermore, the adsorption efficiency of the GALA was able to keep 89.8 % within 5 cycles of adsorption-desorption. Overall, the GALA reduces costs and reuses waste lignin, which were eco-friendly, regenerate and convenient biomass adsorbents that has the good potential for wastewater treatment.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2020.125281