Adsorption of Diazo Dye from Aqueous Solutions by Magnetic Montmorillonite Composite

Abstract

Synthetic dyes have complex molecular structures and are stable molecules against oxidizing agents, sunlight, and microbial attack. Therefore, the treatment of dye‐containing wastewater using appropriate techniques is of great importance. Difficulties in separation and recovery of an adsorbent from the solution limit the large‐scale applications of the adsorption process. A magnetic separation technique can be adapted to the adsorption process to overcome these limitations. In this study, a natural mineral‐based magnetic adsorbent is prepared by a co‐precipitation method. Adsorption performance of magnetic montmorillonite (MagMt) is evaluated in both batch and continuous systems as a function of initial pH, contact time, adsorbent dosage, ionic strength, flow rate, and bed depth. MagMt is characterized through infrared (IR) spectroscopy, scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX), vibrating sample magnetometer (VSM), X‐ray diffraction (XRD), and zeta potential measurement. Sorption yield of MagMt for Bismark Brown‐Y (BB‐Y) is found as maximum (98.60%) at pH 4 with 40 mg adsorbent. Fast sorption equilibrium is attained within 10 min and the sorption data follow the pseudo‐second‐order kinetic model and Langmuir isotherm model. The maximum monolayer sorption capacity of MagMt is 138.70 mg g‒1.

4‐Aminosalicylic Acid Functionalized Multiwalled Carbon Nanotubes for Rapid Removal of Crystal Violet Dye from Wastewater Using Minicolumn

“…A similar type of adsorption study using the flow‐injection system with UV‐Visible spectrophotometric method has been conducted by Shahida et al., for the adsorption of Thorium(IV) on the surface of XAD‐4 resin impregnated with oxytetracycline [12] . A fixed bed column study of the dye using peristatic pumps for the injection of sample and eluent and a UV‐visible Spectrophotometer for determination of dye concentration after adsorption and desorption was reported by Akar and co‐workers [29] . The use of peristaltic pumps not only reduces the time required for the overall adsorption and desorption process but also reduces the amount of the adsorbent and eluent used as compared to normal column method as reported in the literature [30] …”

Layered Clay Minerals in Cancer Therapy: Recent Progress and Prospects

“…And the porous MMT formed by CTAB removal can be simultaneously served as a drug delivery carrier to capture chemotherapeutic drug mitoxantrone (MIT) to form FePt@MMT‐MIT, which inhibits the growth of central tumor. [ 142 ] Ultimately, the functionalized FePt@MMT‐MIT can be used as a multifunctional antitumor system by in combination with MRI, chemotherapeutic drugs, and magnetic guide targeting.…”