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首页> 外文期刊>Chemical engineering journal >N-doped biochar synthesized by a facile ball-milling method for enhanced sorption of CO2 and reactive red
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N-doped biochar synthesized by a facile ball-milling method for enhanced sorption of CO2 and reactive red

机译：通过舒适的球磨方法合成的N掺杂生物炭，用于增强二氧化碳和反应性红色的吸附

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Doping of nitrogen (N) on carbon materials often requires complicated synthetic steps or specific machinery. In this study, N-doped biochar was successfully synthesized by simply ball milling pristine biochar with ammonium hydroxide. The content and species of N in the resulting N-doped biochars were carefully characterized, the formation mechanisms of N-related groups were illustrated, and their applications in CO2 uptake and reactive red removal were evaluated. Most of N introduced to biochar was loaded on its surface in forms of -NH2 and C equivalent to N, resulting from the dehydration of -COOH and -OH. Biochars produced at 450 degrees C were doped with more N on the surface (XPS, 2.41%-2.65%) than those produced at 600 degrees C (XPS, 1.18%-1.82%) because the content of O-containing functional groups in biochar decreases with increasing pyrolysis temperature. The basic properties of N-related groups enhanced the sorption performance of biochar to both acidic CO2 and anionic reactive red. For example, the CO2 uptake of the N-doped, 450 degrees C hickory biochar was 31.6%-55.2% higher than the corresponding pristine and ball-milled biochars. The maximum sorption capacity of the N-doped, 600 degrees C bagasse biochar to reactive red was about 3.66-16.2 times of the corresponding biochars without N doping. This paper provides an alternative and facile approach to prepare N-doped biochar that can be extended to other carbon materials to meet the specific needs in different applications, especially adsorption.
机译：氮气（n）掺杂碳材料通常需要复杂的合成步骤或特定机械。在该研究中，通过简单地用氢氧化铵的球磨原始Biochar成功地合成了N-掺杂的生物炭。仔细考虑了所得的N掺杂生物脉中N的含量和种类，说明了N相关基团的形成机制，评价了它们在CO 2吸收和反应性红色去除中的应用。引入BioChar的大部分N载于其表面上的-NH 2和C等于N的形式，由-COOH和-OH的脱水产生。在450℃下产生的Biochars在表面上掺杂更多N（XPS，2.41％-2.65％），而不是在600℃（XPS，1.18％-1.82％）中产生的那些，因为Biochar中的含O型官能团的含量随着热解温度的增加而降低。 N相关族的基本性质增强了生物炭的吸附性能与酸性二氧化碳和阴离子反应性红色。例如，N掺杂的CO 2吸收，450℃的山丸生物炭比相应的原始和滚珠研磨的Biochars高出31.6％-55.2％。 N-DOPED的最大吸附容量，600摄氏度的BAGASSE BIOCHAR对相应的生物脉冲的约3.66-16.2倍，没有n掺杂。本文提供了一种制备能够延伸到其他碳材料的N-掺杂生物炭，以满足不同应用，尤其是吸附的特定需求。

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