The experimental data of investigating the efficiency of zinc oxide nanoparticles technology under ultraviolet radiation (UV/ZnO) to remove Acid – 32 – Cyanine 5R from aqueous solutions

The aim of this data was to evaluate the efficiency of zinc oxide nanoparticles plus ultraviolet radiation (UV/ZnO) technology to remove Acid – 32 – Cyanine 5R. The effect of optimal parameters including initial pH (5,10), contact time (2–20 min), initial dye concentration (0.5–2 mg/L), and zinc oxide dosage (0.1 and 0.2 g/L) was investigated. The data showed that under alkaline conditions (pH = 10) and 0.2 g/L of ZnO nanoparticles, the maximum dye removal efficiency was observed under UV/ZnO process conditions. Furthermore, with the increase in Acid – 32 – Cyanine 5R dye concentration, the removal efficiency of the dye diminished, while with prolongation of the radiation time, the removal efficiency increased. In the presence of ultraviolet radiation, there is a need to longer time and higher radiation intensity for complete removal of the dye. However, in the presence of ZnO nanoparticles alone, around 5–10% of the dye is removed. The highest removal efficiency of Acid – 32 dye was through radiation by ultraviolet lamp 150 W at an initial dye concentration of 1 mg/L, in pH 5 and 10, respectively, at 98.5% and 99% respectively. On the other hand, through hybrid use of UV/ZnO, within a shorter time, complete removal (100%) is achieved. Generally, use of UV/ZnO process can be utilized as a suitable method for dye wastewaters treatment.

the other hand, through hybrid use of UV/ZnO, within a shorter time, complete removal (100%) is achieved. Generally, use of UV/ZnO process can be utilized as a suitable method for dye wastewaters treatment. & 2018 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Subject area
Environmental Chemistry More specific subject area Photo-catalytic removal Type of data

Value of the data
The obtained data present a high efficiency method for removed Acid -32 -Cyanine 5R dye from the wastewater of textile industries.
The information of the data includes the methods of zinc oxide nanoparticles plus ultraviolet radiation (UV/ZnO), use of zinc oxide nanoparticles alone (ZnO), and ultraviolet radiation process (UV) in removing Acid -32 -Cyanine 5R dye from aqueous solutions.
The research data indicate that the photocatalytic process with the help of ZnO nanoparticles under ultraviolet radiation (UV/ZnO) can completely remove Acid -32 -Cyanine 5R acidic dye within a shorter time.
The data will be useful for removing Acid -32 -Cyanine 5R dye from water and wastewater.

Data
The efficiency of Acid -32 dye removal through radiation with the help of ultraviolet lamp 150 W at different pH has been shown in Tables 1 and 2. Figs. 1 and 2 demonstrate the Acid -32 dye removal efficiency using ZnO nanoparticles alone within the contact time of 20 min with ZnO dosage of 0.1 and 0.2 g/L. The Acid -32 dye removal efficiency using the nanophotocatalytic method of UV/ ZnO at different pH (5 and 10) and ZnO dosage (0.1 and 0.2 g/L) can be observed. Fig. 3 displays the schematic of the photocatalyst reactor. The qualitative properties of the dyeing wastewater studied here can be seen in Table 7. Fig. 4 reveals Acid -32 -Cyanine 5 dye removal efficiency from real wastewater (dyeing) using UV/ZnO nanophotocatalytic method under optimal process conditions (Tables 3-6).

Materials
All of the chemical used in the data such as Acid -32 -Cyanine 5R dye, ZnO nanoparticles (purity degree ¼ 99.8%), ultraviolet lamp (150 W), HCl and NaOH were all analytical grade. Stock solution 50 mg/L of Acid -32 -Cyanine 5R dye was used to prepare the dye samples with the concentrations of interest. ZnO nanoparticles were prepared from NanoPars Spadana Co. [1,2]. Then, using a furnace at 400°C, it was activated for 30 min and utilized to perform the dye removal experiments.
The pH of the solutions was measured using a pH meter E 250. All experiments related to COD-BOD 5 -pH variables and TSS were performed according to the standard edition of the 22st ed [3]. The color concentration was determined using the Perkin-Elmer lambada 25-UV/Vis and the true color was measured in ADMI (American Dye Manufactures Institute) units at 400-700 nm wavelengths.

Designing the experiments
All of the dye removal experiments were performed in a glass container with a volume of 2 L and useful volume of 1 L as batch using ZnO nanoparticles as mixed with a dye-containing synthetic solution. After adding the ZnO nanoparticles, the intended solutions were placed on a magnetic stirrer for 20 min in darkness for mixing to occur (IkA-Werke) [1,2,[4][5][6]. After that, the intended solution was transferred to a photocatalytic reactor. Inside the reactor, medium-pressure UV lamp (150 W) was used as the radiation source (Fig. 3). To cool the lamp down and keep the temperature uniform throughout the experiments, a 2-L beaker was placed inside a glass container containing cool water and thermometer, so that the temperature would remain constant around 24°C across all of the experiments. The pH of the samples of interest was adjusted using HCl 0.1 M and NaOH 0.1 M Table 1 The Acid -32 dye removal efficiency through radiation by ultraviolet lamp 150 W at pH ¼ 10.
2.3. Investigating the Acid -32 -Cyanine 5R dye removal efficiency in real dyeing wastewater samples To evaluate the Acid -32 -Cyanine 5R dye removal efficiency, samples were taken from the output wastewater of a dyeing workshop. They were then kept at certain time intervals under optimal Table 4 The Acid -32 dye removal efficiency using the nanophotocatalytic method of UV/ZnO at pH ¼ 5 and ZnO concentration ¼ 0.2 g/L.

Time (min)
Dye concentration (mg/L) 100 100 Table 5 The Acid -32 dye removal efficiency using the nanophotocatalytic method of UV/ZnO at pH ¼ 10 and ZnO concentra- 100 100 Table 6 The Acid -32 dye removal efficiency using the nanophotocatalytic method of UV/ZnO at pH ¼ 5 and ZnO concentration ¼ 0.1 g/L. operational conditions of the reactor. After complete centrifugation of the samples, the maximum absorption of the samples was read by a spectrophotometer, and the extent of reduction of the wastewater dye by the nanophotocatalytic process was determined. Table 7 provides the qualitative properties of the studied dyeing wastewater.

Data analysis
The Acid -32 -Cyanine 5R dye removal efficiency was determined by the following equation: In this equation, C i represents the initial concentration of the dye in the suspension (mg/L) and C t shows the final concentration of the dye in the suspension (mg/L) [1,2]. Table 7 The qualitative properties of the studied dyeing wastewater.