Abstract In this study adsorption potential of oxidation activated carbon (ox-AC) and graphene oxide (GO) was investigated. Cd(II) was bound to cationic complexes with 1,10-phenanthroline or 2,2-bipyridyl. The sorbents have been used for the dispersive solid-phase extraction of Cd(II) prior to its inductively coupled plasma optical emission spectrometric or electrothermal atomic absorption spectrometric determination. The influences of the various analytical parameters including pH, eluent type, ligand amount, sample volume and sorption time on the recovery efficiencies of Cd(II) were investigated. The limit of detection for activated carbon - 1,10-phenanthroline and activated carbon - 2,2-bipyridyl were 0.006 and 0.016 ng mL−1, respectively. For graphene oxide with 1,10-phenanthroline and graphene oxide with 2,2-bipyridyl obtained limit of detection were 0.046 and 0.091 ng mL−1, respectively. Maximum adsorption capacities and preconcentration factors were compared. The equilibrium sorption fitted better to the Langmuir isotherm. The method was validated with the certified reference materials ERM-BB186 and SRM 1640a.

中文翻译：

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活性炭和氧化石墨烯上含镉的 1,10-菲咯啉和 2,2-联吡啶配合物的吸附能力比较

摘要 在这项研究中，研究了氧化活性炭 (ox-AC) 和氧化石墨烯 (GO) 的吸附潜力。Cd(II) 与 1,10-菲咯啉或 2,2-联吡啶的阳离子配合物结合。在电感耦合等离子体发射光谱或电热原子吸收光谱测定之前，吸附剂已用于 Cd(II) 的分散固相萃取。研究了各种分析参数（包括 pH 值、洗脱液类型、配体量、样品体积和吸附时间）对 Cd(II) 回收率的影响。活性炭 - 1,10-菲咯啉和活性炭 - 2,2-联吡啶的检测限分别为 0.006 和 0.016 ng mL-1。对于含 1,10-菲咯啉的氧化石墨烯和含 2 的氧化石墨烯，2-联吡啶的检测限分别为 0.046 和 0.091 ng mL-1。比较了最大吸附容量和预浓缩因子。平衡吸附更符合朗缪尔等温线。该方法已使用经认证的参考材料 ERM-BB186 和 SRM 1640a 进行验证。