Optimization of diclofenac sodium adsorption onto graphene nanosheets: capacity, kinetics, isotherms and removal

被引:5
作者
Medeiros, Glauber da Rocha [1 ]
Pereira Junior, Adison da Silva [2 ]
Fontes Galvao, Felipe Mendonca [2 ]
Oliveira do Nascimento, Jose Heriberto [2 ,3 ]
Tinoco, Juliana Delgado [1 ,4 ]
机构
[1] Univ Fed Rio Grande do Norte, Technol Ctr, Grad Program Sanit & Environm Engn, Natal, RN, Brazil
[2] Univ Fed Rio Grande do Norte, Technol Ctr, Dept Text Engn, Res Grp Micro & Nanotechnol Innovat GPIMN, Natal, RN, Brazil
[3] Univ Fed Rio Grande do Norte, Technol Ctr, Grad Program Chem Engn, Natal, RN, Brazil
[4] Fed Univ Rio Grande do Norte UFRN, Dept Civil Engn, Lab Water Resources & Environm Sanitat LARHISA, BR-59078970 Natal, RN, Brazil
关键词
Adsorption; Central composite design; Diclofenac; Graphene oxide; DRINKING-WATER TREATMENT; ENDOCRINE DISRUPTING COMPOUNDS; AQUEOUS-SOLUTIONS; WASTE-WATER; OXIDE; PHARMACEUTICALS; ENVIRONMENT; PRODUCTS; SORPTION; TRANSFORMATION;
D O I
10.5004/dwt.2022.28789
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Recently, emerging contaminants have been studied with greater attention due to their growing presence in aquatic environments, medications being one of the major pollutants owing to their global consumption. Among the main pharmaceuticals detected, the anti-inflammatory diclofenac sodium (DS) is considered the most ecotoxic and features on the European list of priority substances for monitoring as part of Water Framework Directive 39/2013. Among the water treatment processes available, adsorption is a highly effective technical and economic alternative. As such, this study aimed to assess DS removal efficiency using graphene oxide (GO) as an adsorbent. DS was ana-lyzed using a central composite design, with four factors: diclofenac sodium concentration (DSC of 50 to 450 mg L-1), adsorbent concentration (ADSC of 0.2 to 5 g L-1), contact time (Ct of 5 to 45 min) and pH (5 to 9). The results confirmed the modeling of adsorption capacity, adsorbate removal, pseudo-first-order and pseudo-second-order kinetics, intraparticle diffusion, and Langmuir and Freundlich isotherms. DS demonstrated an affinity for adsorption onto GO nanosheets. Maximum adsorption capacity for GO was 669.50 mg g-1 (DSC of 450 mg L-1, ADSC of 0.2 g L-1, Ct of 34.3 min and pH 5) obtained by duplicate identification batches. The data also supported the creation of an equation that indicates the adsorbent dose needed for total DS removal (100%) from a solution.
引用
收藏
页码:176 / 191
页数:16
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