Preparation and adsorption properties of magnetic chitosan composite adsorbent for Cu 2+ removal

Abstract

Water pollution caused by Cu 2+ ions poses a significant threat to the ecosystem and human health, hence the development of highly cost-effective, highly operation-convenient and highly efficient natural polymer-based adsorbents is urgently needed. To overcome this serious problem, a novel cost-effective magnetic chitosan composite adsorbent (CsFeAC) was prepared with magnetic macroparticles and highly porous activated carbon carrier using the sol-gel method. Several methods, namely SEM, BET, FTIR, XRD, TGA and VSM, were applied to characterize the adsorbent. Batch tests were conducted to investigate Cu 2+ adsorption properties of CsFeAC at different pH values, contact time, initial Cu 2+ concentrations and temperatures. The adsorption fits better to the Langmuir isotherm and follows the pseudo-second-order model, suggesting that it is a monolayer adsorption and the rate-limiting step is the chemical chelating reaction. The saturated adsorption capacity is found to be 216.6 mg/g. Thermodynamics analysis suggests that the adsorption process is endothermic, with increasing entropy and spontaneous in nature. BET and XRD tests confirm that the higher specific surface area and lower crystallinity of CsFeAC significantly improve the absorption capacity and rate. FTIR spectra reveal that the amino and hydroxyl groups play an important role in the chelating adsorption. The supermagnetic property of CsFeAC facilitates its easy separation characteristic. Further recycling experiments show that CsFeAC still retains 95% of the original adsorption following the 5 th adsorption-desorption cycle. All these results demonstrate that CsFeAC is a promising recyclable adsorbent for removing Cu 2+ .

Chitosan/iron oxide nanocomposite films: Effect of the composition and preparation methods on the adsorption of congo red

“…Various methods based on membrane technologies, adsorption, biodegradation, distillation, photocatalysis and other approaches, have been utilized for purification and remediation of the polluted water (Hui et al, 2018;You et al, 2018). Among these approaches, adsorption process is regarded as an efficient alternative, due to its simplicity of design, wide adaptability, convenience and ease of operation, especially when the adsorbent is relatively low-priced and readily available (Li et al, 2017;Rafatullah et al, 2010;Thakur et al, 2017;Zahir et al, 2017;Zhou et al, 2018). However, developing the adsorbents with low cost, easy preparation and high efficiency is still the problem and challenge in dye adsorption application (Yang et al, 2018).…”

A Review on Chitosan for the Removal of Heavy Metals Ions

“…They also cause secondary pollution in the environment due to their small dimensions [159,160]. In order to eliminate these disadvantages, magnetic chitosan composite with macro particles was developed by adding porous activated carbon for the removal of copper ions and it showed successful results with a maximum capacity for adsorption at 216.6 /mg with 95% efficiency [95]. Elwakeel et al modified magnetic chitosan with TEPA for the adsorption of uranium ions and the maximum adsorption capacity reached to 1.8 mmol/g [161].…”

Utilization of Various Analogy of Synthetic Nanoporous Zeolites and Composite of Zeolites for Decontamination/Detoxification of CWA Simulants—An Updated Review

“…Li Jixiang et al [97] (2017) reported novel efficient and cost-effective magnetic polymer composite macro particles with highly porous activated carbon carrier adsorbent (CsFeAC) was synthesized by using the sol-gel method. It was found that synthesized polymer composite have higher specific surface area and lower crystalinity which enhance the absorption capacity.…”