Abstract Activated carbon (AC) was modified by using non-thermal plasma in O2, N2 and O2/N2 atmospheres to increase its Cu(II) adsorption capacity and quantify the influences of the modifying atmospheres. SEM, BET, FT-IR and XPS were used to characterize the surface physical and chemical properties of AC. The results show that the AC modified by using plasma had significantly better Cu(II) adsorption performance than the raw AC. Among the O2, N2 and O2/N2 atmospheres, the AC with plasma modification in N2 showed best Cu(II) adsorption performance and the Cu(II) adsorption capacity was 369.5% higher than the raw AC. The AC modified in O2 atmosphere can form C—COOH groups, while the AC modified in N2 atmosphere can form C—NH2 groups. These two groups are both beneficial for Cu(II) adsorption, where the —NH2 groups are more effective for Cu(II) adsorption compared to —COOH groups. The chemisorption dominated the Cu(II) adsorption on the plasma modified AC and the adsorption performance was dependent on the surface functional groups properties of AC.

中文翻译：

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在 O2、N2 和 O2/N2 气氛中通过非热等离子体改性增强活性炭对 Cu(II) 的吸附

摘要 通过在 O2、N2 和 O2/N2 气氛中使用非热等离子体对活性炭 (AC) 进行改性，以增加其对 Cu(II) 的吸附能力并量化改性气氛的影响。SEM、BET、FT-IR 和 XPS 用于表征 AC 的表面物理和化学性质。结果表明，等离子体改性活性炭比原始活性炭具有明显更好的Cu(II)吸附性能。在 O2、N2 和 O2/N2 气氛中，在 N2 中等离子体改性的活性炭表现出最好的 Cu(II) 吸附性能，Cu(II) 吸附容量比原始活性炭高 369.5%。在O2气氛中改性的AC可以形成C-COOH基团，而在N2气氛中改性的AC可以形成C-NH2基团。这两个基团都有利于 Cu(II) 的吸附，其中 -NH2 基团对 Cu(II) 吸附比 -COOH 基团更有效。化学吸附主导了等离子​​体改性活性炭上的 Cu(II) 吸附，吸附性能取决于活性炭的表面官能团特性。