Scholarlink

<p>Carbon microspheres (CMSs) were synthesized from soluble starch via a straightforward and efficient hydrothermal carbonization process. Soluble starch was chosen as a cost-effective, non-toxic, and sustainable precursor, offering a green approach to the production of carbon microspheres. Two types of amino-functionalized carbon microspheres (NH<sub>2</sub>-CMSs) were subsequently prepared via surface amino-modification using aqueous ammonia or ammonium persulfate. Quantitative analysis revealed that NH<sub>2</sub>-CMSs modified with ammonia exhibited a surface amino content 2.5 times higher than those modified with ammonium persulfate. Structural and morphological characterizations confirmed the successful synthesis of uniformly sized spherical NH<sub>2</sub>-CMSs, with the amino-functionalization maintaining the integrity of the carbon framework. Adsorption studies demonstrated that NH<sub>2</sub>-CMSs achieved a significantly enhanced theoretical maximum adsorption capacity of 130.96&#xa0;mg·g<sup>−1</sup> for Pb<sup>2+</sup>, surpassing that of unmodified CMSs (80.87&#xa0;mg·g<sup>−1</sup>) by 1.62 times. The primary adsorption mechanism involved the formation of covalent bonds between amino groups and Pb<sup>2+</sup>, resulting in stable metal complexes. The adsorption kinetics indicated a single-molecule adsorption behavior dominated by chemical adsorption as the rate-determining step. These findings underscore the potential of NH<sub>2</sub>-CMSs as highly effective adsorbents for the removal of Pb<sup>2+</sup> from aqueous solutions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Preparation of Amino-Functionalized Carbon Microspheres and Their Adsorption Characteristics for Pb2+ in Aqueous Solutions

  • 期刊论文

  • 发表日期：

    2025年4月21日

查看全文
  • Jiangfei Cao,
  • Shuqi Xiao,
  • Wenting Deng,
  • Jiaying Zhang,
  • Rui Chen,
  • Jianqiao Qin,
  • Xiang Li

摘要

Carbon microspheres (CMSs) were synthesized from soluble starch via a straightforward and efficient hydrothermal carbonization process. Soluble starch was chosen as a cost-effective, non-toxic, and sustainable precursor, offering a green approach to the production of carbon microspheres. Two types of amino-functionalized carbon microspheres (NH2-CMSs) were subsequently prepared via surface amino-modification using aqueous ammonia or ammonium persulfate. Quantitative analysis revealed that NH2-CMSs modified with ammonia exhibited a surface amino content 2.5 times higher than those modified with ammonium persulfate. Structural and morphological characterizations confirmed the successful synthesis of uniformly sized spherical NH2-CMSs, with the amino-functionalization maintaining the integrity of the carbon framework. Adsorption studies demonstrated that NH2-CMSs achieved a significantly enhanced theoretical maximum adsorption capacity of 130.96 mg·g−1 for Pb2+, surpassing that of unmodified CMSs (80.87 mg·g−1) by 1.62 times. The primary adsorption mechanism involved the formation of covalent bonds between amino groups and Pb2+, resulting in stable metal complexes. The adsorption kinetics indicated a single-molecule adsorption behavior dominated by chemical adsorption as the rate-determining step. These findings underscore the potential of NH2-CMSs as highly effective adsorbents for the removal of Pb2+ from aqueous solutions.