Changes in surface characteristics and adsorption properties of 2,4,6-trichlorophenol following Fenton-like aging of biochar

Abstract

Fenton-like system formed in a natural soil environment deemed to be significant in the aging process of biochar. Aged biochars have distinct physico-chemical and surface properties compared to non-aged biochar. The aged biochar proved to be useful soil amendment due to its improved elements contents and surface properties. The biochar aging process resulted in increased surface area and pore volume, as well as carbon and oxygen-containing functional groups (such as C=O, –COOH, O–C=O etc.) on its surface, which were also associated with the adsorption behavior of 2,4,6-trichlorophenol (2,4,6-TCP). The biochar aging increased the adsorption capacity of 2,4,6-TCP, which was maximum at pH 3.0. The 2,4,6-TCP adsorption capacity of aged-bush biochar (ABB) and aged-peanut shell biochar (APB) was increased by 1.0–11.0% and 7.4–38.8%, respectively compared with bush biochar (BB) and peanut shell biochar (PB) at the same initial concentration of 2,4,6-TCP. All biochars had similar 2,4,6-TCP desorption rates ranging from 33.2 to 73.3% at different sorption temperatures and times. The desorbed components were mainly 2,4,6-TCP and other degraded components, which were low in concentration with small molecule substance. The results indicated that the aged-biochar could be effective for the long-term remediation of naturally organic polluted soils.

Hexavalent chromium elimination from wastewater by integrated micro-electrolysis composites synthesized from red mud and rice straw via a facile one-pot method

“…The peaks of C 1 s (Fig. 1 c) with the binding energy of 284.78 eV and 284.78 eV related to the structure of C=C and C=O/C–O 31 , 32 . These results could be contributed to the generation of oxygen-contained functional groups during pyrolysis processes.…”

Efficiency of engineered/modified biochars-based adsorbents for removal of pollutants from aquatic environment: A critical review

“…cadmium. Cui et al (2021) investigated the Fe 2 O 3 -modifed biochar of bush and peanut shell for the removal of 2, 4, 6-trichlorophenol. Biochar modification enhanced the removal rate of 2,4,6-trichlorophenol, the 2,4,6-trichlorophenol adsorption rate of treated-peanut shell and modified-bush biochar was enhanced by 7.4-38%, and 1.0-11% respectively.…”

Combining lime and organic amendments based on titratable alkalinity for efficient amelioration of acidic soils

“…Biochar, for example, was added at a rate of 100 % CaCO 3eq , which was comparable to the rates for compost and blended poultry litter, but biochar increased soil pH more than these amendments. This might be caused by other properties of biochar such as a high inherent pH and solid-phase carbonate content following pyrolysis (Mosley et al, 2015) as well as oxygen-rich surface functional groups and a large specific surface area, which leads to high surface adsorption of protons and Al 3+ (Chintala et al, 2014;Cui et al, 2021).…”