Data on the alizarin red S adsorption from aqueous solutions on PAC, treated PAC, and PAC/γ≈Fe2O3

Three types of adsorbents of powdered activated carbon (PAC), treated PAC, and PAC/γ ≈ Fe2O3 nanocomposite were used. The adsorption experiments were performed in batch conditions. pHZPC of PAC/γ ≈ Fe2O3 was 6.7. As a result, at lower than pHZPC, acidic pH, the adsorption of alizarin red S on PAC/γ ≈ Fe2O3 was favourable. The maximum of alizarin red S adsorption of PAC, treated PAC, and PAC/γ ≈ Fe2O3 was 24.5 mg/g, 57.8 mg/g, and 112.56 mg/g, respectively. The models of Langmuir and pseudo-first-order were a fit model to describe the adsorption isotherm and the Kinetic, respectively. The PAC/γ ≈ Fe2O3 is a promising class of the adsorbents in the adsorption of various dyes from textile effluents.


a b s t r a c t
Three types of adsorbents of powdered activated carbon (PAC), treated PAC, and PAC/γ E Fe 2 O 3 nanocomposite were used. The adsorption experiments were performed in batch conditions. pH ZPC of PAC/γ E Fe 2 O 3 was 6.7. As a result, at lower than pH ZPC , acidic pH, the adsorption of alizarin red S on PAC/γ E Fe 2 O 3 was favourable. The maximum of alizarin red S adsorption of PAC, treated PAC, and PAC/γ E Fe 2 O 3 was 24.5 mg/g, 57.8 mg/g, and 112.56 mg/g, respectively. The models of Langmuir and pseudofirst-order were a fit model to describe the adsorption isotherm and the Kinetic, respectively. The PAC/γ E Fe 2 O 3 is a promising class of the adsorbents in the adsorption of various dyes from textile effluents. &

Subject area
Wastewater treatment More specific subject area Adsorption Type of data Value of the data • The data from the present study showed that the modification of conventional absorbents can be used to considerably enhance the ability to remove environmental pollutants. • The data obtained can be used to complete the information in literature on the removal of dye compounds from water environments and industrial effluents.

Data
The XRD pattern and SEM for treated PAC and PAC/γ E Fe 2 O 3 nanocomposite are presented in Fig. 1. Based on BET, the surface area of PAC, treated PAC, and PAC/γ E Fe 2 O 3 were found to be 389 m 2 /g, 550 m 2 /g, and 400 m 2 /g, respectively. Fig. 2 shows the effect of solution pH of PAC, treated, PAC and PAC/γ E Fe 2 O 3 nanocomposite on alizarin red S adsorption. The results of the study showed that the pH of the zero point (pH ZPC ) was 6.5. Fig. 3 shows the effect of adsorbent dose of PAC, treated PAC, and PAC/γ E Fe 2 O 3 nanocomposite on alizarin red S adsorption. Fig. 4 depicts the effect of initial concentration of PAC, treated PAC, and PAC/γ E Fe 2 O 3 nanocomposite on alizarin red S adsorption.
The constants of isotherm models for PAC, treated PAC and PAC/ γ-Fe 2 O 3 nanocomposite on alizarin red S adsorption are given in Table 1. As illustrated in Table 1, the isotherm model of Langmuir for PAC, treated PAC and PAC/γ-Fe 2 O 3 nanocomposite has the highest R 2 (e.g. square correlation). Therefore, this model was the most suitable model to express alizarin red S adsorption onto the adsorbents. Also, the constants of kinetics models for PAC, treated PAC and PAC/γ-Fe 2 O 3 nanocomposite on alizarin red S adsorption are summarized in Table 2. As illustrated in Table 2, the kinetic model of pseudo-second order for PAC, treated PAC and PAC/γ-Fe 2 O 3 nanocomposite has the highest R 2 . As a result, this model was the most suitable kinetics model for alizarin red S adsorption onto the prepared adsorbents.

Materials
The chemicals including hydrochloric, hydrochloric, powered activated carbon (PAC), iron chloride tetrahydrate, iron chloride tetrahydrate, and alizarin red S were used. These high purity chemicals were purchased from Merck and Sigma-Aldrich.

Preparation of treated PAC and PAC-γ-Fe 2 O 3 nanocomposite
For PAC coatings by γ E Fe 2 O 3 , the methodology of previous studies were obeyed [1,2]. In the first step, in order to prepare treated PAC, this method was as follows: 20 g of PAC was added to a solution of 5 M nitric acid (Approximately 150 mL). The solution was placed at 70°C for 1 h. In the next step, in order to prepare activated carbon coated with γ-Fe 2 O 3 , this method was as follows: treated PAC

The adsorption experiments
The adsorption feasibility of Alizarin red S was studied by PAC, treated PAC, and PAC/γ E Fe 2 O 3 nanocomposite. The adsorption experiments were performed in batch conditions. The main variables studied were initial dye concentration, pH, reaction time, and treated PAC and PAC-γ-Fe 2 O 3 dosage. At the first step, a stock Alizarin red S solution (C 14 H 8 O 4 , 1000 mg/l, 240.21 g/mol, pK a ¼ 6.9) was prepared and stored under standard conditions. An adsorbent of PAC, treated PAC and PAC-γ-Fe 2 O 3 nanocomposite was added to 100 mL of Alizarin red S solution. Equation C 1 V 1 ¼ C 2 V 2 was used to prepare different concentrations of stock solution. The solutions of 0.1 N HCl and NaOH were used to adjust the desired pH. The residual dye was measured by a spectrophotometer DR-5000 (UV-UVIS, 350 nm) [3].