The Characterization and Amoxicillin Adsorption Activity of Mesopore CaCO3 Microparticles Prepared Using Rape Flower Pollen

Abstract

A precipitation reaction method was employed to prepare mesopore calcium carbonate (CaCO3) using rape flower pollen as the template. CaCO3 adsorbent was characterized using X-ray diffraction (XRD), scanning electronic microscopy (SEM), and Brunner−Emmet−Teller measurements (BET). The equilibrium adsorption data on amoxicillin were explained using Langmuir, Freundlich, and Temkin adsorption isotherm models. The pseudo-first order, second order, pseudo-second order, and intra-particle diffusion kinetic models were used to explore adsorption kinetics. Equilibrium adsorption of as-prepared CaCO3 was better depicted using the Langmuir adsorption model with an R2 of 0.9948. The separation factor (RL) was found to be in the range of 0 < RL < 1, indicating the favorable adsorption of amoxicillin. The adsorption capacity of mesopore CaCO3 reached 13.49 mg·g−1 in 0.2 g∙L−1 amoxicillin solution. The values of adsorption thermodynamic parameters (ΔHθ, ΔSθ, ΔGθ) were obtained. In addition, the adsorption process turned out to be endothermic and spontaneous for the CaCO3 product at 298 K, 308 K, and 318 K.

Magnetic Graphene Oxide/Chitin Nanocomposites for Efficient Adsorption of Methylene Blue and Crystal Violet from Aqueous Solutions

“…A different adsorption isotherm was examined to study the interaction between the dye and MGO/CH NC, taking various initial concentrations of dye. It was then attempted to fit the experimental data into Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D–R) isotherm models using eqs , , , and , respectively: , where q max and q e (in mg/g) are the maximum and equilibrium adsorption capacity of the adsorbent, K L (in L/mg) is the Langmuir adsorption constant, which is related to the affinity of binding sites, and C e (in mg/L) is the equilibrium concentration of the adsorbate. In the Freundlich isotherm, K F (in L/mg) and n are Freundlich isotherm constants, both of which are related to adsorption capacity and order of the adsorbent.…”

Insights on the Synthesis of Al-MCM-41 with Optimized Si/Al Ratio for High-Performance Antibiotic Adsorption

“…The best performance was observed for the S-CP sample (132 mg g −1 ), synthesized according to the conditions of the central points (S-9, S-10, and S-11) of the factorial design. It should be highlighted that this adsorption capacity far exceeded the values reported in the literature for other adsorbents used for antibiotic removal, such as multiwalled carbon nanotubes/iron nanoparticles (23.4 mg g −1 ), 37,39,40 mesoporous calcium carbonate (13.5 mg g −1 ), 41 and MCM-41/CTA composite (55 mg g −1 ). 42 Interestingly, sample S-8 (Si/Al = 16.1) presented higher SSA (840 m 2 g −1 ) than sample S-2 (Si/Al = 5.0), for which the value was only 129 m 2 g −1 , despite its high aluminum content, confirmed by the mass loss at 280−400 °C (Figure 3b), and low degree of order of the hexagonal arrangement, confirmed by the absence of the characteristic peaks in the X-ray diffractogram (Figure 1b).…”

Sonochemical Synthesis of Vaterite-Type Calcium Carbonate Using Steamed Ammonia Liquid Waste without Additives

“…Calcium carbonate (CaCO 3 ) is one of the most widely used fill materials. It is used in pigments, 1 plastics, 2 wastewater treatment, 3 paper, 4 cement, 5 rubber, and adhesives. 6 Therefore, synthesizing CaCO 3 via a precipitation reaction is a popular topic in chemical engineering.…”