Air oxidation in surface engineering of biochar-based materials: a critical review

Sun, Zhuozhuo; Dai, Lichun; Lai, Penghui; Shen, Feng; Shen, Fei; Zhu, Wenkun

doi:10.1007/s44246-022-00031-3

Cited by 18 publications

(14 citation statements)

References 135 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results showed that BET specific surface area, total pore volume, micropore volume, and mesopore volume were increased from 40.93 m 2 /g for LHB to 60.42 m 2 /g for LHCB, suggesting that TAO of LHB was favorable for pore development. This observation was consistent with previous results about the TAO of various biochars. , In addition, the volumes of total pores and mesopores were more remarkably increased after TAO of LHB, suggesting that TAO was more favorable for the development of mesopores.…”

Section: Resultssupporting

confidence: 92%

“…During the TAO process, surface carboxyl groups will be enriched, thus La species could be complexed with these functional groups. Simultaneously, TAO also generate a large amount of CO 2 , attributed to the desorption of chemically adsorbed oxygen on biochar surface . Thus, during TAO, La species could complex with carboxyl groups and react with CO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Biochar-based adsorbents have attracted extensive attention in P removal and recovery, ,, attributed to the fact that biochar is easy to produce at lab or industrial scales via a variety of carbonization processes (e.g., hydrothermal carbonization, pyrolysis) with tunable physicochemical properties from abundant and sustainable biomass wastes for tailored applications. , Specifically, considering the agricultural functions of biochar, it is more competitive in P recovery as a slow-release fertilizer for agricultural applications . Thus, increasing attention has been paid on the development of biochar as the carrier of La species, i.e., La-doped biochar …”

Section: Introductionmentioning

confidence: 99%

“…In addition, thermal air oxidation (TAO) has attracted increasing attention for the surface oxygenation of biochar-based materials. 23,24,32 Consequently, ascribed to the coordination of metal species with oxygenated functional groups (OFGs), biochar with an oxygenated surface has been observed to be more efficient as the carrier to load metal species. 33,34 The TAO of biochar is also accompanied by the desorption of chemically adsorbed oxygen in the form of CO 2 .…”

Section: ■ Introductionmentioning

confidence: 99%

“…Hydrothermal biochar has been observed to be remarkably oxygenated by TAO at 300 °C, 36,37 and high temperature is not favorable for the preservation of surface OFGs. 23 Thus, considering the thermal behavior of La(OH) 3 and LaOHCO 3 , and the efficient temperature for the oxygenation of hydrothermal biochar under TAO condition, TAO at 300 °C in air was chosen as the condition to synchronously tune the coordination environment and chemical species of La on biochar. The TG and DTG curves of LHB and hydrothermal biochar under air atmosphere showed that the decomposition started at 273 °C, and the maximum mass loss rates were observed at 296 °C for LHB and the hydrothermal biochar during TAO (Figure S1c).…”

Section: ■ Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Thermal Air Oxidation-Mediated Synchronous Coordination and Carbonation of Lanthanum on Biochar toward Phosphorus Adsorption from Wastewater

Hu,

Liang,

Zhou

et al. 2023

Inorg. Chem.

Self Cite

View full text Add to dashboard Cite

Biochar has attracted increasing attention as the sustainable and structure-tunable carrier for lanthanum (La) species for diverse applications. Carbonated La species possesses a higher biocompatibility and a lower leaching potential than other commonly used La species, while less attention is paid on the application of carbonated La in phosphorus (P) adsorption. Herein, thermal air oxidation (TAO) was applied as a novel strategy for synchronously tuning the coordination environment and chemical species of La on biochar surface. The results demonstrated that TAO induced the coordination of La with oxidation-generated oxygenated functional groups (OFGs) and carbonation of La species by the oxidationgenerated CO 2 on the biochar surface. The batch adsorption results showed that the Q m of resultant biochar remarkably increased from 68.92 to 132.49 mg/g at 1 g/L dosage. It also showed a robust adsorption stability in pH 2−6, a strong resistance to the co-existing Cl − , SO 4 2− , NO 3 − , CO 3 2−, or HCO 3 − , a stable adsorption recyclability, and an ultralow La leaching potential. The P adsorption was dominated by ligand exchange-induced inner-sphere complexation. In practical swine wastewater, the resultant biochar composite (1 g/L) removed 99.87% of P from 92.3 to 0.12 mg/L at a practical pH of 7.12. The density functional theory calculation further revealed the significant role of the binding of carbonated La by the biochar surface OFGs in reducing the P adsorption energies, indicating the synergism between the oxygenated biochar carrier and the carbonated La in P adsorption. Finally, this study provided a novel route to synchronously tune the coordination environment and chemical species of La on biochar via a facile TAO process for high-efficient P adsorption from wastewater.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%