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Excellent Adsorption–Desorption of Ammonium by a Poly(acrylic acid)-Grafted Chitosan and Biochar Composite for Sustainable Agricultural Development
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-29 , DOI: 10.1021/acssuschemeng.0c05070 Lixun Zhang 1, 2 , Shengyin Tang 3 , Yuntao Guan 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-29 , DOI: 10.1021/acssuschemeng.0c05070 Lixun Zhang 1, 2 , Shengyin Tang 3 , Yuntao Guan 2
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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 °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.
中文翻译：
聚（丙烯酸）接枝的壳聚糖和生物炭复合物对铵的优异吸附-解吸，促进农业可持续发展
作为土壤改良剂的材料的发现提高了土壤氮素利用效率，为同时解决农业生产和污染问题提供了一个有前途的策略。在此，研究了聚丙烯酸接枝的壳聚糖和生物炭复合物（PAA / CTS / BC）对铵（NH 4 + -N）的吸附-解吸性能及其机理，以评价其在土壤改良剂中的潜力。此外，进一步应用数学模型探索了PAA / CTS / BC对控制土壤NH 4 + -N损失的影响。结果表明，PAA / CTS / BC具有较高的NH 4 + –N吸附能力，最大值为149.25 mg·g –1在25°C下，比大多数报道的基于BC的吸附剂要高得多。NH 4 + -N的快速吸附在20分钟内以> 90％的效率完成，这主要归因于与羧基的主要静电相互作用。由于NH 4 + -N与材料的结合力较弱，因此随着液相浓度的变化，吸附的NH 4 + -N易于释放。这些结果表明，PAA / CTS / BC可被视为一种氮缓释介质，可动态保持土壤中植物可用的NH 4 + -N浓度。最后，NH 4 +的数学模拟在PAA / CTS / BC改良土壤中的–N流量表明，在10周的水稻种植中，以1.57–2.02％的材料剂量，土壤NH 4 + –N损失有效减少了24.18–31.77％。
更新日期：2020-11-09
中文翻译：
聚（丙烯酸）接枝的壳聚糖和生物炭复合物对铵的优异吸附-解吸，促进农业可持续发展
作为土壤改良剂的材料的发现提高了土壤氮素利用效率，为同时解决农业生产和污染问题提供了一个有前途的策略。在此，研究了聚丙烯酸接枝的壳聚糖和生物炭复合物（PAA / CTS / BC）对铵（NH 4 + -N）的吸附-解吸性能及其机理，以评价其在土壤改良剂中的潜力。此外，进一步应用数学模型探索了PAA / CTS / BC对控制土壤NH 4 + -N损失的影响。结果表明，PAA / CTS / BC具有较高的NH 4 + –N吸附能力，最大值为149.25 mg·g –1在25°C下，比大多数报道的基于BC的吸附剂要高得多。NH 4 + -N的快速吸附在20分钟内以> 90％的效率完成，这主要归因于与羧基的主要静电相互作用。由于NH 4 + -N与材料的结合力较弱，因此随着液相浓度的变化，吸附的NH 4 + -N易于释放。这些结果表明，PAA / CTS / BC可被视为一种氮缓释介质，可动态保持土壤中植物可用的NH 4 + -N浓度。最后，NH 4 +的数学模拟在PAA / CTS / BC改良土壤中的–N流量表明，在10周的水稻种植中，以1.57–2.02％的材料剂量，土壤NH 4 + –N损失有效减少了24.18–31.77％。
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