Caffeine adsorption on activated biochar derived from macrophytes (Eichornia crassipes)

被引：23

作者：

Zanella, Heloisa G. ^{[1
]}

Spessato, Lucas ^{[1
]}

Lopes, Greice K. P. ^{[1
]}

Yokoyama, Jessica T. C. ^{[1
]}

Silva, Marcela C. ^{[1
]}

Souza, Patricia S. C. ^{[1
]}

Ronix, Amanda ^{[1
]}

Cazetta, Andre L. ^{[1
]}

Almeida, Vitor C. ^{[1
]}

机构：

[1] Univ Estadual Maringa, Dept Chem, 5790 Colombo Ave, BR-87020900 Maringa, Parana, Brazil

来源：

JOURNAL OF MOLECULAR LIQUIDS | 2021年 / 340卷

关键词：

Physical activation; Psychotropic substance; Porous materials; Environment; AQUEOUS-SOLUTION; WATER HYACINTH; METHYLENE-BLUE; AZO-DYE; REMOVAL; CARBON; WASTE; OPTIMIZATION; PYROLYSIS; KINETICS;

D O I：

10.1016/j.molliq.2021.117206

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This work reports the use of macrophyte (Eichornia crassipes) as raw material for preparation activated biochar (ABC) from the physical activation, using CO2 as activating agent. The ABC was applied in the removal of caffeine (CAF) from the aqueous solution. The characterization of ABC showed that it has micro and mesoporosity features with BET surface area (S-BET) value of 740 m(2) g(-1) and basic character of surface with value of pH(PCZ) of 8.44. CAF adsorption study demonstrated that the initial pH is not a factor that directly influences the adsorption capacity, whose q(e) is 161.1 +/- 10.56 mg g(-1). The kinetic study showed that pseudo-second-order model is that better describe the adsorption process. Adsorption equilibrium study indicated the Redlich-Peterson as the best isothermal model and that ABC has high mono-layer adsorption maximum capacity of CAF (Q(max) = 117.8 mg L-1). Thermodynamic studies indicated that the processo is spontaneous, endothermic and governed by chemisorption. (C) 2021 Elsevier B.V. All rights reserved.

引用

页数：9

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