Experimental data on the adsorption of Reactive Red 198 from aqueous solution using Fe3O4 nanoparticles: Optimization by response surface methodology with central composite design

The aim of this study was to evaluate the efficiency of Fe3O4 nanoparticles for Reactive Red 198 adsorption. The adsorbents were characterized by SEM and XRD. In this dataset, the influence of Reactive Red 198 dye concentration, solution pH, adsorbent dosage, and contact time on Reactive Red 198 dye adsorption by Fe3O4 nanoparticles was tested by central composite design (CCD) under response surface methodology (RSM). The Fe3O4 nanoparticles adsorbent was prepared by chemical co-precipitation. The process efficiency was achieved in optimal conditions including pH=7, adsorbent dosage equal to 0.5 g/L, initial dye concentration of 100 mg/L, contact time equal to 30 min, 88%. Overall, the data offer a facile adsorbent to remove Reactive Red 198 dye from aqueous solutions.


Specifications
image and figure How data was acquired -Design experiments were carried out using Central Composite Design (CCD) and adsorption tests were done in batch mode. The parameters were evaluated using RSM. -The concentrations of Reactive Red 198 in the samples were measured using a UV-visible spectrophotometer (HACH, USA, model DR6000) set at a wavelength 518 nm. -The characteristics of the nanoparticles were analyzed using SEM (Tuscan Mira 3 LMU) and XRD (Philips X'Pert, Netherlands This data article presents a user central composite design (CCD) combined with response surface methodology (RSM) to optimize Reactive Red 198 removal from aqueous solution using adsorption process. Fig. 1. The SEM image of the prepared adsorbent is also illustrated in Fig. 2.

This dataset contains 3 Figures and 4 Tables. The XRD analysis of Fe 3 O 4 nanoparticles is shown in
Structure and characteristics of a Reactive Red 198 (RR198) dye are seen in Table 1. The design matrix for the central composite designs (CCD) is listed in Tables 2 and 3.
The data for Analysis of variance (ANOVA) for second order model in the removal of RR198 show in Table 4. Central composite design 3-D surface plots which showing the effect of various parameters on RR198 removal efficiency with the adsorbent of Fe 3 O 4 nanoparticles are presented in Fig. 3.

Preparation Fe 3 O 4 nanoparticles
Magnetic nanoparticles were prepared by chemical co-precipitation method. In this method, 16 mmol of FeCl 2 Á 6H 2 O and mmol 8 of FeCl 3 Á 4H 2 O with a stoichiometric ratio of 1 to 2 of Fe 2 þ and Fe 3 þ were mixed and in 200 ml of deionized water dissolved. The solution was then completely agitated at ambient temperature using a magnetic stirrer. Under these conditions, 10 ml of 25% ammonia was slowly added to the resulting solution, followed by a black colored sediment at the bottom of the container was formed. This precipitate indicates the presence of magnetic iron nanoparticles. After 10 min, stirring continuously to remove ammonia from the reaction medium, the iron nanoparticles were collected at the end of the container by placing the magnet under the reaction vessel, then the supernatant was removed and the precipitate was washed three times with ionizing water [1][2][3][4][5]. Finally, the characteristics of magnetic nanoparticles were determined by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

Design of experiments
The pH of the solutions was adjusted prior to the adsorption by using 0.1 M solutions of HCl and NaOH and measured using a pH meter (Sense Ion 378, Hack) [6][7][8][9][10]. In this study, Design Expert 7.0.1 software was used to determine the number of experiments, values, and range of variables. The effects of operational parameters including pH (3-7), contact time (30-70 min), RR198 initial concentration (100-200 mg/L) and adsorbent dosage (0.25-0.5 g/L) on the amount of RR198 adsorbed onto the Fe 3 O 4 nanoparticles were assessed and optimized by central composite design (CCD) combined with response surface methodology (RSM) was used to identify the optimum conditions for maximum removal of Reactive Red 198 dye [11][12][13]. The data were analyzed by the statistical method (ANOVA).
The removal efficiency, RE, (%) and equilibrium adsorption capacity, q e , (mg g À 1 ) were calculated as follows [13]: where C i , C e, and C t are the initial, equilibrium and at time t of RR198 concentrations (mg/L), respectively.