Biochar-based nano-composites for the decontamination of wastewater: A review

Magnetic carbon composites with a hierarchical structure for adsorption of tetracycline, prepared from sugarcane bagasse via hydrothermal carbonization coupled with simple heat treatment process

“…Many magnetic adsorbents have been prepared and extensively investigated in prior studies, such as metal-based magnetic adsorbents (Yang et and biomolecule-based magnetic adsorbents (Thanikaivelan et al, 2012). Among these, the biochar-based magnetic adsorbents are carbon-based magnetic materials, and they are most promising materials for environmental applications (Tan et al, 2016). Besides their high chemical and physical stability, another main advantage of these materials is that the feedstock for their production is abundant and low-cost, usually coming from agricultural biomass (Tan et al, 2016).…”

“…Among these, the biochar-based magnetic adsorbents are carbon-based magnetic materials, and they are most promising materials for environmental applications (Tan et al, 2016). Besides their high chemical and physical stability, another main advantage of these materials is that the feedstock for their production is abundant and low-cost, usually coming from agricultural biomass (Tan et al, 2016). However, in prior reports the preparation of biochar-based magnetic composites has mostly required multi-step processing, high temperatures (usually > 500°C) and toxic chemicals in carbonization and activation, followed by impregnation and formation of the magnetic particles, mostly iron oxides, inside the carbon matrix ( In this study, we present a novel facile methodology to fabricate magnetic carbon composites via a simple HTC process at the low 230°C temperature, followed by a short heat treatment at 400°C.…”

One-pot synthesis of carbon supported calcined-Mg/Al layered double hydroxides for antibiotic removal by slow pyrolysis of biomass waste

“…Therefore, biochar can serve as a carrier material for the LDHs and CLDHs, which helps to minimize the pulverization of hydrotalcite22, and in turn, LDHs and CLDHs can also functionalize biochar materials for wastewater treatment23. Compared with other carrier materials, multiple advantages of using biochar as the substrates material are existed, including its abundant and low-cost feedstocks (agricultural biomass and solid waste), lower energy requirements during production, and concomitant energy production (biofuels and syngas)2124. Studies have also reported that biochar can efficiently remove antibiotics from aqueous solutions2526.…”

Highly efficient adsorption of Cr(VI) from aqueous solution by Fe3+ impregnated biochar

“…Moreover, it has been reported that cations such as magnesium and iron could be easily attached electrostatically to the negatively charged BC surface, which then facilitated complexation with negatively charged contaminants. [38,39] Thus, it is expected that the impregnation of pristine BC with Fe 3+ will significantly enhance the adsorption of Cr(VI) oxyanion.…”