Because of the widespread application of activated carbon (AC) as adsorbents, reduced production costs are highly desirable, therefore, inexpensive alternatives for activated carbon precursors and eco-procedures are presently sought. In this work, AC was successfully prepared from sawdust through co-calcinations with limestone. The surface area and porosity of the resulting ACs were evaluated according to the N 2 adsorption at 77 K. Acid Orange II (AOII) was utilized as a negative dye to study the potential of the resulting AC as an adsorbent. Results revealed that the surface area and total pore volume were both increased greatly. When the activated carbon was prepared in mass ratios of 1:2 and 1:1 (calcium carbonate to sawdust), the surface area increased to 611.4 and 706.9 m 2 /g, respectively, and the adsorption capacities increased to 310.89 and 389 mg/g. These enhancements indicated efficient activation, resulting in energy-saving and environmentally friendly activated carbon production. Thus, this paper provides a cleaner process for producing activated carbon from waste sawdust through bioresource recycling.
Benefitting from its lightweight, low cost and considerable liquid holding capability, bio-based 3D carbon materials with considerable hydrophobicity have stood out as effective oil-water separators to address oily water problems. However, in order to obtain ideal hydrophobicity , recent approaches such as the thermal-induced sp 2 -hybridization and nano-texturing construction are energy-consuming and complicated, limiting the large-scale production. Here, through the catalysis co-calcination of transition metals salts (TMSs) and biomass precursor, agriculture solid waste-sugarcane residues were successfully converted to hydrophobic photo-thermal metal/carbon materials (CMs) with lower calcination temperature. Comparing with normal carbonization method, catalysis co-calcination can achieve higher carbonization degree and larger yield with lower consumption energy. The as-prepared Cu-CMs can adsorb 18.49 g/g, 31.33 g/g, 24.45 g/g, 38.25 g/g, and 41.98 g/g of DMF, toluene, methanol, chloroform and carbon tetrachloride, respectively, showing excellent adsorption capability towards organic solvents. Moreover, owing to the synergistic photothermal effect of carbon skeleton and metal remains, the metal/carbon materials can heat the oil efficiently and show better adsorption performance for high-viscous oil. The catalysis co-calcination method is demonstrated as a promising method to produce CMs with unique properties and the metal/carbon materials is also supposed to be an effective wastewater treat materials.
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