Facile synthesis of highly efficient and recyclable magnetic solid acid from biomass waste

Abstract

In this work, sawdust, a biomass waste, is converted into a magnetic porous carbonaceous (MPC) solid acid catalyst by an integrated fast pyrolysis–sulfonation process. The resultant magnetic solid acid has a porous structure with high surface area of 296.4 m2 g−1, which can be attributed to the catalytic effect of Fe. The catalytic activity and recyclability of the solid acid catalyst are evaluated during three typical acid-catalyzed reactions: esterification, dehydration, and hydrolysis. The favorable catalytic performance in all three reactions is attributed to the acid's high strength with 2.57 mmol g−1 of total acid sites. Moreover, the solid acid can be reused five times without a noticeable decrease in catalytic activity, indicating the stability of the porous carbon (PC)–sulfonic acid group structure. The findings in the present work offer effective alternatives for environmentally friendly utilization of abundant biomass waste.

Removal of cadmium(II) cations from an aqueous solution with aminothiourea chitosan strengthened magnetic biochar

“…During the carbonizing process at 550 °C, the FeCl 3 preloaded sawdust powder was often decomposed thermally and gradually turned into solid carbonaceous particles, whereas the FeCl 3 probably underwent a drastic dehydration process to form Fe 3 O 4 , and the produced volatile components were swept out by the continuous N 2 gas supply. Similar results were also reported during the pyrolysis of the FeCl 2 and FeCl 3 pre‐impregnated orange peel powder, sugarcane leaves, and sawdust …”

Extraction of arabinoxylans from wheat bran using hydrothermal processes assisted by heterogeneous catalysts

“…This method is based on the reported by several authors (Hu et al, 2015;Hu et al, 2016;Liu, Tian, Jiang, & Yu, 2013;Wang et al, 2011;Zheng, Chen, Hu, Yan, & Kong, 2014).…”

Preparation of Granular Carbon‐Based Solid Acid Catalyst from White Poplar and the Catalytic Activities in Esterification

“…The catalyst prepared from method‐2 carbonized at 700 °C exhibited the highest activity of 98% (Figure ). This is related to the acid density and internal structure of solid catalyst under synthesis conditions . As the carbonation temperature increases, the degree of graphitization of the carbon precursor increases, and the structure becomes denser.…”