Aloe Vera Functionalized Magnetic Nanoparticles Entrapped Ca Alginate Beads as Novel Adsorbents for Cu(II) Removal from Aqueous Solutions

Abstract

CABs (Ca alginate beads), AVCABs (Aloe vera Ca alginate beads), and AVMNCABs (Aloe-vera functionalized magnetic nanoparticles entrapped Ca alginate beads) were developed as adsorbents for the removal of Cu(II) from aqueous solutions. The materials were characterized using Fourier-transform infrared (FTIR) spectroscopy, high-resolution scanning electron microscopic (HR-SEM) analysis, X-ray diffraction (XRD), energy-dispersive X-ray (EDX) spectroscopy, and a vibrating-sample magnetometer (VSM). The effect of several parameters, such as pH, time, temperature, adsorbent dose, etc., were investigated. The adsorption isotherm of Cu(II) was adjusted best to the Langmuir model. The maximum adsorption capacities were 111.11 mg/g, 41.66 mg/g, and 15.38 mg/g for AVMNCABs, AVCABs, and CABs, respectively. The study of the adsorption kinetics for Cu(II) ions on beads followed a pseudo-second-order kinetic model, with a very good correlation in all cases. The adsorption studies used a spectrophotometric method, dealing with the reaction of Cu(II) with KSCN and variamine blue.

Green Synthesis and Photocatalytic Dye Degradation Activity of CuO Nanoparticles

“…Some of these methods are ion exchange, chemical oxidation, ozonolysis, photocatalytic degradation, and coagulation-based techniques [16][17][18][19][20][21]. Adsorption is often used to remove several water pollutants [22][23][24][25][26][27][28][29][30][31][32][33][34]. However, photocatalytic degradation using a semiconductor photocatalyst is considered a cost-effective and green approach to successfully degrade dyes [35][36][37][38][39].…”

Sulfur-Doped Binary Layered Metal Oxides Incorporated on Pomegranate Peel-Derived Activated Carbon for Removal of Heavy Metal Ions

“…Several methods including bioremediation, electrocoagulation, reverse osmosis, oxidation, filtration, nanofibrous membrane, biochar, and adsorption [5][6][7][8] have been employed to remove heavy metal ions from water samples. Numerous benefits and drawbacks exist for each of these methods.…”

“…Adsorbents for removing heavy metal ions have been made from various micro/nanoscale materials, including biomass, montmorillonite, carbon-based material, polymers, metal-organic framework, and metal oxides. Most proposed materials have drawbacks such as high price, lack of stability, insufficient sorption capacity, ineffective removal effectiveness, poor selectivity, and the generation of secondary pollutants [4,7]. Activated carbon (AC) is a highly porous adsorbent used in the adsorption process to control air and water pollution.…”