Acid – treated activated carbon for phenolic compound removal in acid pre-treatment of lignocellulosic biomass for biogas production

Abstract

Phenolic compound can be an inhibitor during acid pre-treatment process in the conversion of biomass into bioenergy and consequently reduces the production yield. Thus, this study aimed to investigate the potential use of activated carbon from coconut shell for phenolic compound removal and gallic acid was used as model phenolic. Granular activated carbon was treated by using 20% concentration of phosphoric acid to its properties and function. Acid treated and untreated activated carbon were characterized in term of morphology, surface functionalities and material phase by means of SEM, FT-IR and XRD. Few parameters that influenced the removal of gallic acid were studied which included the effect of adsorbent dosage, initial concentration, contact time, and pH. It is observed that the acid treated activated carbon was successfully remove the gallic acid for about 97% using of 0.5g/L adsorbent dosage, with initial concentration of 100 mg/L, at pH value of 4 and 150 minutes contact time. The adsorption behavior was fixed with Langmuir isotherm fixed the experiment data which indicates homogenous adsorption. These experimental results also revealed that coconut shell based activated carbon is viable cheaper adsorbent for phenolic compound removal.

Biochar from Grapevine Pruning Residues as an Efficient Adsorbent of Polyphenolic Compounds

“…Similar results were obtained in the experiment conducted by Lee et al [ 26 ], in which the lower dosage of food waste-based biochar adsorbed the highest amount of phenol. Hamzah et al [ 79 ] explained that increasing the dosage after reaching the adsorptive optimum level could lead to adsorbent accumulation itself and overlaying the active site resulting in decreased removal efficiency. As for the adsorption dynamics experiment and the online solid phase extraction, OLP was the poorest adsorbed compound, albeit with the highest recovery, followed by GA and CA.…”

“…The adsorption capacity of CA on Active Charcoal TE80 ® (AC) was 229 mg kg −1 AC, which is almost 40-fold higher in comparison with the results obtained in this work. Furthermore, in another research [ 79 ], coconut shell-based activated carbon was used to determine its adsorption potential in phenolic compound removal using GA as a phenolic representative. The authors observed a few parameters that influenced the removal of GA; adsorbent dosage, initial concentration, contact time, and pH, concluding that the acid-treated activated carbon had successfully removed 97% of GA under specific conditions.…”

Adsorption of Sr(II) cations onto titanium dioxide, doped with Boron atoms

“…In addition, the adsorption value after regeneration was 39.8÷7.2 mg‧ g -1 for adsorbent 0.5B-TiO2 at a confidence level of 95%. The test results indicate the suitability of Boron-dopped titanium dioxide in the acid medium and its ability for regeneration [26].…”