期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 603, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125281
关键词
Graphene oxide; Aminated lignin; Adsorption; Synergy
资金
- Natural Science Foundation of China [21978029, 31770624]
- National Key R&D Program of China [2018YFD0400703]
- Program for Liaoning Excellent Talents in University [LR2016058]
- Liaoning BaiQianWan Talents Program [201945]
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.
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