PAN nanofiber-Mat (n-fib@Mat), PAN/ZnO n-fib@Mat, and PAN/ZnO-TiO2 n-fib@Mat were prepared via electrospinning method. Their high adsorption capacities against dissolved Cr (VI) ions make them as super adsorbents for water treatment. The structure of n-fib@Mat was investigated using XRD, FTIR, SEM, and TEM techniques. The effects of selected parameters such as contact time, initial concentration, and n-fib@Mat amount were assessed in a fixed bed reactor. It was found that the adsorption capacities of PAN n-fib@Mat, PAN/ZnO n-fib@Mat, and PAN/ZnO-TiO2 n-fib@Mat were pH-dependent and the optimal pH value was between 2.1 and 2.2. The adsorption was rapid, and the equilibrium was reached within 240 min to remove of Cr (VI) ions for PAN/ZnO-TiO2 n-fib@Mat and 360 min for PAN n-fib@Mat and PAN-ZnO n-fib@Mat. Langmuir isotherms model is preferred for PAN n-fib@Mat, PAN-ZnO n-fib@Mat, and PAN/ZnO-TiO2 n-fib@Mat for Cr (VI) adsorption. The equilibrium adsorption capacities are 153.85 mg/g, 234.52 mg/g, and 333.43 mg/g for PAN n-fib@Mat, PAN/ZnO n-fib@Mat, and PAN/ZnO-TiO2 n-fib@Mat for Cr (VI), respectively. The produced n-fib@Mat showed excellent removal ability for Cr (VI). The adsorption kinetic was obeyed pseudo-second-order reaction rate.

中文翻译：

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ZnO-TiO2 掺杂聚丙烯腈纳米纤维毡用于去除污水中的 Cr (VI)

通过静电纺丝法制备了PAN纳米纤维-Mat (n-fib@Mat)、PAN/ZnO n-fib@Mat和PAN/ZnO-TiO2 n-fib@Mat。它们对溶解的 Cr (VI) 离子的高吸附能力使其成为水处理的超级吸附剂。使用 XRD、FTIR、SEM 和 TEM 技术研究了 n-fib@Mat 的结构。在固定床反应器中评估了选定参数的影响，例如接触时间、初始浓度和 n-fib@Mat 量。结果表明，PAN n-fib@Mat、PAN/ZnO n-fib@Mat 和 PAN/ZnO-TiO2 n-fib@Mat 的吸附能力是 pH 依赖性的，最佳 pH 值在 2.1 和 2.2 之间。吸附迅速，PAN/ZnO-TiO2 n-fib@Mat 在 240 分钟内达到平衡以去除 Cr (VI) 离子，PAN n-fib@Mat 和 PAN-ZnO n-fib@ 在 360 分钟内达到平衡垫。Langmuir 等温线模型优选用于 PAN n-fib@Mat、PAN-ZnO n-fib@Mat 和 PAN/ZnO-TiO2 n-fib@Mat 用于 Cr (VI) 吸附。PAN n-fib@Mat、PAN/ZnO n-fib@Mat和PAN/ZnO-TiO2 n-fib@Mat对Cr的平衡吸附容量分别为153.85 mg/g、234.52 mg/g和333.43 mg/g （六）分别。生产的 n-fib@Mat 显示出优异的 Cr (VI) 去除能力。吸附动力学服从准二级反应速率。