Dataset on infrared spectroscopy and X-ray diffraction patterns of Mg–Al layered double hydroxides by the electrocoagulation technique

The XRD profiles and FTIR analysis of sludge aggregates, Mg–Al layered double hydroxides, produced during electrocoagulation processes are presented. The data describes the composition of materials (LDH) produced at different operations conditions (atmospheric conditions and Mg2+/Al3+ ratio). The data show the diffraction peaks of (003), (006), (018) and (110) crystal planes for hydrotalcite structure.


Data
The electrochemical method for the synthesis of Layered Double Hydroxides (LDHs) by electrocoagulation is used as an alternative procedure [1]. The LDHs are a class of anionic clays which have observed increasing attention due to their applications in many research areas [2]. Therefore, physicochemical properties of HDL materials, mainly explored from X-ray diffraction and FTIR analysis, disclose their more specific applications. The dataset presents LDH characteristics prepared by electrocoagulation varying atmospheric conditions and Mg 2þ /Al 3þ ratio. Figs. 1e6 show the diffraction peaks of (003), (006), (018) and (110) crystal planes for hydrotalcite structure. Tables 1e6 describe information on the phases and hkl -diffraction planes. Table 7 shows the band positions in the FTIR spectra. Figs. 7e12 displays the functional groups and bonding information. Table 8 exhibits the LDHmaterial specifications.

X-ray diffraction
X-ray diffraction (XRD) patterns of the materials were measured using an X'pert PRO-PANalytical diffractometer with CuKa radiation (l ¼ 0.1542nm). The data were collected in the 2ʘ range of 4e90 . Determination of the phases and diffraction planes were determined using X'pert PRO-PANalytical software [3]. In every case, hydrotalcite composite was showed. Some XRD and FTIR patterns of the composites were similar to those reported in the literature for hydrotalcite materials [4].

Infrared spectroscopy
The FTIR analysis was carried out in the spectral range (500e4000) cm À1 by a Jasco FTIR-4100 spectrometer with a resolution of 4 cm À1 . The Figs. 7e12 represent the FTIR spectrum of composites and different vibrations attribution of the composites are represented in Table 7.

Experimental design, materials and methods
The experimental procedure is described details by Molano-Mendoza [1]. Here the protocol is provided for nitrogen experiments, giving details that were omitted from previous research article.
Specifications Table   Subject area  Chemical Engineering  More specific subject area  Lamellar materials  Type of data  Table, image, graph, figure How data was acquired X-ray diffraction (XRD) patterns were recorded using a X'pert PRO e PANalytical diffractometer under the following conditions: 45 kV, 40 mA, monochromatic CuKa radiation (l ¼ 0.1542 nm) over a in the 2q range from of 4 to -90 . The FTIR spectra was recorded with a JASCO FT/IR-4100 over a frequency in a range of 500-4000 cm-1. The samples were prepared by mixing the powdered solids with KBr.

Data format
Raw data are tabulated and analyzed

Experimental factors
The XRD and FTIR analysis were performed according to the LDHs typical characterization Experimental features The LDH materials were prepared by electrocoagulation method with varying operations conditions and M 2þ /M 3þ ratio Data source location Universidad del Valle, Cali, Colombia Data accessibility The data are presented in this article

Value of the Data
The data set shows the methodology to obtain Layered Double Hydroxides (LDHs) through electrocoagulation (EC) method varying atmospheric conditions and M 2þ /M 3þ ratio. X-ray characterization discloses a "classical" 2H-polytype (Magnesite) of LDHs as well as common LDHs impurities. FTIR analysis indicates some interesting stretching and bending bonds that can have an effect on the type of material.
The EC method can guide other researchers toward designing multifunctional LDHs by using other metal electrodes (Zn, Fe, Co) for environmental applications such as water/ground remediation, solar energy storage or conversion and catalysis support.    Electrocoagulation experiments were conducted in a batch mode, using synthetic chloride solutions as supporting electrolyte. A 5.000 mg L-1 of Sodium Chloride solution was prepared by the dissolution of Sodium Chloride (AR grade) in deionized water giving an overall final conductivity of 8.4 msˑcm À1 .
This solution was left to dissolve for 10 min. For nitrogen experiments, the beaker was covered and stirred with a speed of 100-rpm for 3.15 h. The sample was dried in a conventional oven for 2 h at 110 C. The dried samples were then crushed into a fine powder using a ceramic mortar/bowl.
The electrocoagulation unit consisted on two plates that worked as anodes and cathodes, AZ31 magnesium alloy, Mg or aluminum, with an immersed area of 46.6 cm 2 each. The distance between electrodes was 5 mm, and the solution was mixing at 100 rpm using a hot magnetic plate mixer machine. Electrodes were connected to a DC power supply and the appropriate amount of the trivalent and divalent cations were carefully added to the beaker by a manual polarity inverter unit at an applied current of 0.36 and 0.15 mA. The Mg 2þ /Al 3þ ratio and the operating time were calculated based on Faraday's law, assuming that electro-dissolution only occurs at the anode. Before testing, electrodes were subjected to dry abrasion with emery paper No. 600 and then with abrasive paper No. 1000. Afterwards, the electrodes were rinsed with distilled water for approximately 5 min to remove traces (Table 8 describes the experimental conditions).
The following units were obtained beforehand and thoroughly cleaned: Digital scale Glass beaker (size: 1000 ml) Magnetic hotplate stirrer         Table 7 Positions of the bands (in cm-1) in the IR spectra (Figs. 7e12) [4,5].