A highly efficient strategy for enhancing the adsorptive and magnetic capabilities of biochar using Fenton oxidation

Removal of methyl orange from water by Fenton oxidation of magnetic coconut-clothed biochar

“…The adsorption peaks around 3420, 891, and 1620 cm −1 can be assigned to the stretching vibration peaks of O–H, CC, and CO, respectively, indicating that the surface of the composite was rich in oxygen-containing functional groups, which was conducive to the adsorption of organic compounds. Specifically, Fe 3 O 4 /CBc showed an absorption peak at 607 cm −1 in the infrared image, which was the bending vibration peak of Fe–O–Fe, 18,19 suggesting that Fe 3 O 4 was successfully loaded on the surface of coconut-clothed biochar.…”

Combining Oxidative Torrefaction and Pyrolysis of Phragmites australis: Improvement of the Adsorption Capacity of Biochar for Tetracycline

“…The observed peaks at 3,436 and 3,433 cm −1 primarily correspond to the O-H stretching of water (Khan et al, 2020;Ntzoufra et al, 2021). The peak at 1624 cm −1 is attributed to the stretching vibrations of C = O and aromatic C = C (Xu et al, 2020). The peaks at 1,581 and 1,578 cm −1 were attributed to the stretching vibration of skeletal C = C (Zhang et al, 2019;Chen et al, 2020).…”

An Efficient Strategy for Enhancing the Adsorption Capabilities of Biochar via Sequential KMnO4-Promoted Oxidative Pyrolysis and H2O2 Oxidation

“…In the past decades, different strategies, such as grafting, metal-doping and oxidation, were developed to enhance the adsorption capability of biochar for eliminating contaminants. Particularly, oxidation provides a robust tool for the preparation of diversified biochars by incorporating oxygen-containing groups as well as modulating carbon matrix structure and mineral composition [3][4][5].…”

“…Manganese oxides (MnO x ) have a good affinity to heavy metals [15][16][17]; thereby, MnO x -doped biochars were made for removal of Pb(II), Cu(II) and Cd(II) in an aqueous solution using KMnO 4 as a precursor in recent years [18,19]. Similarly, a recyclable 3D MnO 2 -doped biochar-based hydrogel was prepared using KMnO 4 and Mn(OAc) 2 precursors for adsorption Pb(II) and Cd(II), establishing a method for solidliquid separation of biochar [20]. A MnO x /biochar composite was also manufactured through co-pyrolysis of pristine biochar with KMnO 4 for remedying As(III)-polluted soil, revealing MnO x and oxygen-containing groups acted as oxidant and active adsorption sites for As (III), respectively [21].…”

“…Especially, the combination of metal and H 2 O 2 oxidative modifications can gain a synergistic effect for upgrading the adsorption capability of biochar. Metal oxides can be generated in a biochar matrix in small size [23] and acted as stable and active catalysts for H 2 O 2 oxidation [4]. Therefore, subsequent H 2 O 2 oxidation can produce highly active HO• [24] and metal oxide intermediate species [25][26][27] to oxidize various groups into oxygen-containing groups, overcoming the above-mentioned drawback of single H 2 O 2 oxidation.…”