Graphene zirconium oxide nanocomposite (Gr@ZrO₂‐NC) has been functionalized with cetyltrimethylammonium bromide (CTAB or CT) or butanediyl‐1,4, bis (N, N‐hexadecyl ammonium) dibromide (cationic gemini surfactant (CGS)). Structural, morphological, optical and thermal properties of synthesized adsorbents (Gr@ZrO₂‐NC, CT‐Gr@ZrO₂‐NC and CGS‐Gr@ZrO₂‐NC) are investigated using XRD, FTIR, electron microscopy and TGA. CGS‐Gr@ZrO₂‐NC showed faster removal efficacy (90 % within the first 25 min) for anionic azo dyes (methyl orange, MO and Congo red, CR) compared to other adsorbents. This effect may be due to the creation of stronger hydrophobic region at the surface of adsorbent with CGS. Effects of concentration, contact time and pH were also seen. The adsorption efficacy remained better even in the simultaneous presence of MO and CR. Adsorption data with time showed that the pseudo‐second‐order kinetic model has been obeyed. Adsorbents were regenerated successfully with ethylene glycol (∼83 %).

中文翻译：

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阳离子表面活性剂（常规/双子）功能化的Gr @ ZrO2纳米复合材料的制备及其对水溶液中阴离子偶氮染料的更快吸附性

石墨烯氧化锆纳米复合材料（Gr @ ZrO ₂ -NC）已用十六烷基三甲基溴化铵（CTAB或CT）或丁二基-1,4，双（N，N-十六烷基铵）二溴化物（阳离子双子表面活性剂（CGS））功能化。使用XRD，FTIR，电子显微镜和TGA研究了合成吸附剂（Gr @ ZrO ₂ ‐NC，CT‐Gr @ ZrO ₂ ‐NC和CGS‐Gr @ ZrO ₂ ‐ NC）的结构，形态，光学和热学性质。CGS‐Gr @ ZrO ₂‐NC与其他吸附剂相比，对阴离子偶氮染料（甲基橙，MO和刚果红，CR）具有更快的去除效果（在前25分钟内达到90％）。这种作用可能是由于在CGS吸附剂表面形成了更强的疏水区。还观察到浓度，接触时间和pH的影响。即使同时存在MO和CR，吸附效果仍然更好。随时间的吸附数据表明，已经遵循了伪二级动力学模型。用乙二醇（〜83％）成功再生了吸附剂。