- Title
- Fe/Al (hydr)oxides engineered biochar for reducing phosphorus leaching from a fertile calcareous soil
- Creator
- Peng, Yutao; Sun, Yuqing; Fan, Bingqian; Zhang, Shuai; Bolan, Nanthi S.; Chen, Qing; Tsang, Daniel C. W.
- Relation
- Journal of Cleaner Production Vol. 279, Issue 10 January 2021, no. 123877
- Publisher Link
- http://dx.doi.org/10.1016/j.jclepro.2020.123877
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2021
- Description
- Excessive input of phosphate fertilizer into agricultural soils has caused critical environmental concerns due to high phosphorus (P) accumulation in farmland and P leaching into subsurface drainage. In this study, an Fe/Al (hydr)oxides modified biochar (FA-BC) was fabricated from corn straw via a wet-precipitation method and utilized to reduce P leaching from a fertile calcareous soil. Spectroscopic techniques demonstrated that the FA-BC exhibited a higher oxidation resistance than the raw BC due to oxide impregnation on the BC surface. The maximum Langmuir P adsorption capacities (393 and 528 mg kg-1) of the BC (4%, w/w) and FA-BC (4%, w/w) treated soils demonstrated a more efficient P adsorption capacity of the FA-BC. Application of the 2% (w/w) FA-BC also significantly reduced the leaching of total P (81.3%) from the soil column, while maintained an appropriate level of bioavailable P in the soil for sustaining plant growth. The chemical sequestration test and in-situ P k-edge XANES analyses of the FA-BC incubated soils revealed that the labile Ca-P fractions were transformed into stabilized Fe/Al-P complexes. The increased soil pH, a higher degree of soil P saturation, and intensive interaction between P and Fe/Al (hydr)oxides also contributed to the superior ability of the FA-BC amended soils towards P retention. This study provided field-relevant implications for the design and application of engineered biochar for green and sustainable improvement of agricultural soils.
- Subject
- engineered biochar; phosophorus leaching; sustainable waste management; soil amendment; resource recovery; agricultural soil
- Identifier
- http://hdl.handle.net/1959.13/1423674
- Identifier
- uon:37963
- Identifier
- ISSN:0959-6526
- Language
- eng
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