期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 44, 页码 16451-16462出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c05070
关键词
soil amendment; waste management; biochar; hydrogel; ammonium; slow release; sustainable agriculture
资金
- Major Science and Technology Program for Water Pollution Control and Treatment, National Water Grant [2017ZX07202002]
- National Natural Science Foundation of China [51979141]
- George E. Hewitt Foundation for Medical Research
The discovery of materials as soil conditioners for the improvement of soil nitrogen-use efficiency provides a promising strategy for simultaneously addressing production and pollution problems in agriculture. Herein, adsorption-desorption performance and mechanisms of ammonium (NH4+-N) by a poly(acrylic acid)-grafted chitosan and biochar composite (PAA/CTS/BC) were studied to evaluate its potential in soil amendment. Furthermore, mathematical models were further applied to explore the effects of PAA/CTS/BC on controlling soil NH4+-N loss. Results suggest that PAA/CTS/BC showed a high capacity of NH4+-N adsorption, with a maximum value of 149.25 mg.g(-1 )at 25 degrees C, considerably higher than most of the reported BC-based adsorbents. Fast adsorption of NH4+-N was completed with an efficiency of >90% within 20 min, primarily attributed to the dominant electrostatic interactions with carboxyl groups. Adsorbed NH4+-N was capable of being easily re-released with the variation of the liquid-phase concentration because of the weak binding of NH4+-N with the material. These results demonstrate that the PAA/CTS/BC can be considered as a nitrogen slow-release medium to dynamically maintain a plant-available NH4+-N concentration in the soil. Finally, the mathematical simulation of NH4+-N flow in the PAA/CTS/BC-amended soil revealed that soil NH4+-N loss was effectively reduced by 24.18-31.77% at a 1.57-2.02% material dosage during a 10-week rice cultivation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据