DEVELOPMENT OF INEXPENSIVE CELLULOSE-BASED SORBENTS FOR CARBON DIOXIDE

Franciele L Bernard,Sandra Einloft,Marcus Serefin,Barbara B Polesso,Felipe Dalla Vecchia,Daniela M Rodrigues,Vitaly V Chaban

doi:10.1590/0104-6632.20190361s20170182

Franciele L Bernard, Sandra Einloft + Show 5 more

Open Access

https://doi.org/10.1590/0104-6632.20190361s20170182

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Abstract

ABSTRACT Aqueous amine solutions are benchmark solvents for CO2 capture and their operational drawbacks are well-known. In order to overcome these problems, the support of amines on solid materials appears as an option for CO2 capture. Cellulose is a versatile and low-cost material that can be used as a support. This study reports chemical modification of cellulose fibers extracted from rice husk with different amines and their potential for CO2 capture. The obtained compounds were characterized by different techniques. The CO2 sorption capacity was gravimetrically assessed in a Magnetic Suspension Balance. Quantum mechanical simulations and experimental results revealed that -NH- and -NH2 represent major working sites of the employed compounds. The best result for CO2 sorption was attained for the amine-modified cellulose CL-D-400 with a sorption capacity of 409 µmol CO2/g at 1 bar and 1091 µmol CO2/g at 10 bar with amine concentrations as low as 2 × 10- 6 mol/mg.

Highlights

The CO2 concentration in the atmosphere is increasing every year, as well as global warming and its effect on climate change (Barbosa et al, 2016; Chan et al, 2016; Hussain et al, 2015; Nouri and Ebrahim, 2016; IPCC, 2013; Seo et al, 2014)
Chemical absorption using amine aqueous solutions is a benchmark technology for CO2 capture (Arias et al, 2016; Bachelor and Toochinda, 2012; Kamarudin and Alias, 2013)
Among the amine-modified cellulose samples, the best CO2 sorption result was obtained for the sample functionalized with CL-D-400, whereas the worst result was recorded in the case of CL-D4000

Summary

Introduction

The CO2 concentration in the atmosphere is increasing every year, as well as global warming and its effect on climate change (Barbosa et al, 2016; Chan et al, 2016; Hussain et al, 2015; Nouri and Ebrahim, 2016; IPCC, 2013; Seo et al, 2014). We investigated chemical modification of cellulose fibers, extracted from rice husk, with different amines. The concentration of carboxylic groups (mol/mg) introduced into the modified cellulose was determined by back titration (Gurgel et al, 2008; Karnitz et al, 2007; Shang et al, 2016), by treating the material (0.1 g) with 100 mL of an aqueous solution of NaOH (0.02 mol/L) for 1h under constant stirring.

Results

Conclusion