Textural properties and adsorption behavior of Zn–Mg–Al layered double hydroxide upon crystal violet dye removal as a low cost, effective, and recyclable adsorbent

Abstract

The preparation of adsorbents plays a vital role in the adsorption method. In particular, many adsorbents with high specific surface areas and unique shapes are essential for the adsorption strategy. A Zn–Mg–Al/layer double hydroxide (LDH) was designed in this study using a simple co-precipitation process. Adsorbent based on Zn–Mg–Al/LDH was used to remove crystal violet (CV) from the wastewater. The impacts of the initial dye concentration, pH, and temperature on CV adsorption performance were systematically examined. The adsorbents were analyzed both before and after adsorption using FTIR, XRD, and SEM. The roughness parameters and surface morphologies of the produced LDH were estimated using 3D SEM images. Under the best conditions (dose of adsorbent = 0.07 g and pH = 9), the maximum adsorption capacity has been achieved. Adsorption kinetics studies revealed that the reaction that led to the adsorption of CV dye onto Zn–Mg–Al/LDH was a pseudo-second-order model. Additionally, intraparticle diffusion suggests that Zn–Mg–Al/LDH has a fast diffusion constant for CV molecules (0.251 mg/(g min1/2)). Furthermore, as predicted by the Langmuir model, the maximal Zn–Mg–Al/LDH adsorption capacity of CV was 64.80 mg/g. The CV dimensionless separation factor (RL) onto Zn–Mg–Al/LDH was 0.769, indicating that adsorption was favorable. The effect of temperature was performed at 25, 35, and 45 °C in order to establish the thermodynamic parameters ∆Ho, ∆So, and ∆Go. The computed values indicated exothermic and spontaneous adsorption processes. The study presented here might be used to develop new adsorbents with enhanced adsorption capabilities for the purpose of protecting the water environment.

Carbon supported ternary layered double hydroxide nanocomposite for Fluoxetine removal and subsequent utilization of spent adsorbent as antidepressant

“…Figure 1 displays the X-ray diffraction patterns of LAC before and after FLX adsorption, LAC-FLX. The peaks at 11.42°, 23.41°, 34.49°, 38.99°, 46.60°, 60.09°, 61.2°, and 65.13° correspond to LDH peaks of (003), (006), (012), (015), (018), (110), (113), and (116) 35 . The AC material exhibited peaks at 26.41° and 63.8°, which are associated with the (002) and (221) indices 36 .…”

Fabrication of a surface molecularly imprinted polymer membrane based on a single template and its application in the separation and extraction of phenytoin, phenobarbital and lamotrigine

“…The results showed that the R L values of PHT, PHB, and LTG were all distributed on a scale of 0 to 1, suggesting that a favorable process was present in the adsorption of PHT, PHB and LTG on MIPMs. 42 …”

Copper Immobilized on Modified LDHs as a Novel Efficient Catalytic System for Three-Component Synthesis of Pyrano[2,3-d]pyrimidine and pyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine Derivatives

“…The melting points of the samples were determined using the Electrothermal 9200 device and have not been modified. 1 H and 13 CNMR spectra of the products were taken using the Varian INOVA 500 MHz device. The FTIR spectrum of the samples was obtained using KBr tablets and the PerkinElmer GX FTIR device.…”

“…LDHs can be used as an attractive base in various applications, such as medical, pharmaceutical, sensors, and drug delivery. As a result, they have attracted a lot of attention. − LDHs have a layered structure, which is also called hydrotalcite; it consists of divalent and trivalent cations, whose general formula is [Me 2+ (1 – x ) Me 3+ x (OH) 2 ] x +(An – ) x / n n •H 2 O. , It is possible to change cations and anions, which may affect the properties of the layers. Today, layered double hydroxides are excellent supports for various catalysts due to the numerous hydroxide groups on their surface. − …”

“…As a result, they have attracted a lot of attention. 1 − 4 LDHs have a layered structure, which is also called hydrotalcite; it consists of divalent and trivalent cations, whose general formula is [Me 2+ (1 – x ) Me 3+ x (OH) 2 ] x +(An – ) x / n n •H 2 O. 5 , 6 It is possible to change cations and anions, which may affect the properties of the layers.…”