Environmental-Friendly Adsorbent Composite Based on Hydroxyapatite/Hydroxypropyl Methyl-Cellulose for Removal of Cationic Dyes from an Aqueous Solution

Abstract

The aim of this study is to develop a new, efficient, and inexpensive natural-based adsorbent with high efficacy for the cationic dye methylene blue (MB). A natural-based nanocomposite based on hydroxyapatite (HAp) and hydroxypropyl methylcellulose (HPMC) was selected for this purpose. It was synthesized by the dissolution/reprecipitation method. A film with a homogeneous and smooth surface composed of nanoparticles was prepared from the nanocomposite. HPMC and HAp biopolymers were selected due to their compatibility, biodegradability, and non-toxicity. Total reflectance infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), and calorimetric/thermal gravimetric (DSC/TGA) analysis results revealed the existence of strong physical interaction between the composite components. Scanning electron microscopy (SEM) observations show a composite sheet with a homogenous and smooth surface, indicating excellent compatibility between HPMC and HAp in the composite. The nanocomposite was evaluated as an adsorbent for organic dyes in an aqueous solution. The effects of solution pH, initial MB concentration, composite concentration, and adsorption time on the adsorption efficiency were evaluated. The highest adsorption rate was seen as 52.0 mg of MB/g composite. The adsorption rate reached equilibrium in about 20 min. Fitting of the adsorption data to the Langmuir and Freundlich adsorption models was investigated. Results showed that the adsorption process follows the Langmuir isotherm model. The kinetic study results revealed that the adsorption process was pseudo-second-order. The herein composite is an excellent alternative for use as contemporary industrial-scale adsorbents.

Fabrication, Thermo-Mechanical, and Morphological Characterization of Hydroxyapatite-Reinforced Polyurethane Biocomposites as Dye Adsorbent for Effluent

“…The adsorption equilibrium is achieved when the contact time exceeds 2.5 h, and as the contact time increases, the adsorption efficiency also tends to change to some extent. Experimental data indicate that 2.5 min is sufficient to achieve adsorption equilibrium . Therefore, it can be concluded that the optimum contact time for adsorption is 2.5 h, as shown in Figure A.…”

“…Experimental data indicate that 2.5 min is sufficient to achieve adsorption equilibrium. 44 Therefore, it can be concluded that the optimum contact time for adsorption is 2.5 h, as shown in Figure 8A.…”

Chitosan-Hydroxyapatite Bio-Based Composite in Film Form: Synthesis and Application in Wastewater

“…The impact of adsorption duration and pH was examined, and the pH was changed by adding either HNO 3 or NH 4 OH. The nature of the adsorption process was investigated using thermodynamic parameters [ 31 , 32 , 33 , 34 ].…”

Design of Nanohydroxyapatite/Pectin Composite from Opuntia Ficus-Indica Cladodes for the Management of Microbial Infections

“…The antibacterial polymers usually obtained either by synthesis of monomeric biocide moiety and subsequent polymerization or copolymerization with another monomer or modification can also be brought by grafting of N-alkylated poly (4-vinylpyridine) quaternized polyethyleneimine and quaternary derivatives of acrylic acid onto numerous materials such as cellulose [ 26 ]. Other studies demonstrate that ZnO/Ag nanocomposites, membranes loaded with HAp-Ag 3 PO 4 nanoparticles, and silver nanoparticle–activated carbon composite nanofiber membranes exhibit an enhanced antimicrobial activity [ 17 , 18 , 27 ].…”