生物质衍生二维氮掺杂碳电容去离子脱盐性能研究

Biomass-derived 2D N-doped carbon nanosheets for efficient capacitive deionization

生物质衍生二维氮掺杂碳凭借其优异的特性在电容去离子(CDI)中受到广泛关注。然而,如何有效将生物质衍生制得二维氮掺杂碳,仍然是一个巨大挑战。为解决此问题,开发出了一种简易模板法(以KCl和KOH混合盐为模板)并成功构建制得生物质衍生二维氮掺杂碳。该方法在很大程度上减少了碱的使用量,从而减少环境污染和能源消耗。二维氮掺杂碳在1.2 V、500 mg/L氯化钠溶液中表现出优异的脱盐容量(高达16.67 mg/g)和循环稳定性(循环10次后容量保持率为93.7%)。这不仅为提高碳的脱盐能力提供了一个有效策略,而且可在环境修复中实现生物质废料的绿色回收。

Biomass-derived 2D N-doped carbon with many superior features has drawn widespread attention in capacitive deionization(CDI).However,the effective preparation of 2D N-doped carbon from biomass remains a great challenge.To solve the problem,a simple template method(using a mixture of KCl and KOH salts as templates)was developed to successfully construct biomass-derived 2D N-doped carbon.Notably,the proposed method has successfully reduced the necessary amount of alkali use to a large extent,avoiding environmental pollution and energy consumption.This structure can not only provide sufficient room for ion storage,but also shorten ion diffusion pathway,contributing to superior performance for CDI.Thus,2D N-doped carbon shows a superior desalinization capacity(desalinization capacity of 16.67 mg/g in 500 mg/L NaCl solution at 1.2 V)and cycle stability(capacity retention of 93.7%after 10 desalination cycles).This study not only provides an efficient strategy for improving the desalinization capacity of carbons,but also enables the green recycling of biomass waste in environmental remediation.