Nanophotonics and Applications Lab, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef 62514, Egypt; Geology Department, Faculty of Science, Beni-Suef University, Beni-Suef 62514, Egypt.
Nanophotonics and Applications Lab, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef 62514, Egypt.
Ecotoxicol Environ Saf. 2018 Oct 30;162:261-271. doi: 10.1016/j.ecoenv.2018.06.081. Epub 2018 Jul 11.
Natural zeolite heulandite/polyaniline composite (Hu/PANI) was synthesized for the first time as catalyst support for nickel oxide photocatalyst (Hu/PANI@NiO). The structural, chemical, morphological, textural and optical properties were investigated using different techniques. The synthetic NiO crystals showed well developed flaky habits with diameter range 200-400 nm and length range 1-4 µm. The estimated band gap energies of Hu/PANI composite and Hu/PANI@NiO composite are 1.8 eV and 1.46 eV, respectively, which are remarkably smaller than the recorded value for pure nickel oxide. The photocatalytic properties of Hu/PANI@NiO composite for efficient degradation of safranin-T dye were evaluated under sunlight as a function of irradiation time, initial dye concentration, catalyst mass, solution pH, and the catalyst stability. Hu/PANI@NiO composite exhibits amazing photocatalytic degradation efficiency for safranin dye, whereas 80%, 98%, and ~ 100% of 5 mg/l dye were removed after only 1 min of solar irradiation using 0.025, 0.03, and 0.035 g of Hu/PANI@NiO, respectively. The higher concentrations of the dye (10-50 mg/L) can be fully removed within minutes by increasing the solution pH or using higher doses from the Hu/PANI@NiO catalyst. The removal percentage achieved the maximum value at the alkaline conditions. Also, the Hu/PANI@NiO displayed high stability and remain 84.5% of the initial photocatalytic efficiency after 5 runs. Additionally, the composite can be used effectively in the removal of different types of dyes and mixed dyes within the same time intervals. Thus, loading of nickel oxide onto hybrid Hu/PANI composite as a catalyst support achieved amazing photocatalytic degradation capacity.
天然沸石辉沸石/聚苯胺复合材料（Hu/PANI）首次被合成作为镍氧化物光催化剂（Hu/PANI@NiO）的催化剂载体。使用不同的技术研究了其结构、化学、形态、结构和光学性质。合成的 NiO 晶体具有良好的片状习性，直径范围为 200-400nm，长度范围为 1-4µm。Hu/PANI 复合材料和 Hu/PANI@NiO 复合材料的估计带隙能分别为 1.8eV 和 1.46eV，明显小于纯氧化镍的记录值。作为辐照时间、初始染料浓度、催化剂质量、溶液 pH 和催化剂稳定性的函数，在阳光照射下评估了 Hu/PANI@NiO 复合材料对高效降解藏红 T 染料的光催化性能。Hu/PANI@NiO 复合材料对藏红染料具有惊人的光催化降解效率，在用 0.025、0.03 和 0.035g 的 Hu/PANI@NiO 进行 1 分钟的太阳光照射后，5mg/L 染料的去除率分别为 80%、98%和~100%。通过增加溶液 pH 或使用更高剂量的 Hu/PANI@NiO 催化剂，可以在几分钟内完全去除更高浓度（10-50mg/L）的染料。去除率在碱性条件下达到最大值。此外，Hu/PANI@NiO 在 5 次运行后保持了初始光催化效率的 84.5%，表现出高稳定性。此外，该复合材料可以在相同时间内有效去除不同类型的染料和混合染料。因此，将氧化镍负载到混合 Hu/PANI 复合材料上作为催化剂载体实现了惊人的光催化降解能力。
