Facile Synthesis of Sustainable Tannin/Sodium Alginate Composite Hydrogel Beads for Efficient Removal of Methylene Blue

Gao, Jie; Li, Zhenzhen; Wang, Ziwen; Chen, Tao; Hu, Gensheng; Zhao, Yuan; Han, Xiaobing

doi:10.3390/gels8080486

Cited by 17 publications

(16 citation statements)

References 37 publications

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“…The aerogel microspheres fabricated by freeze-drying exhibit a porous structure, which will facilitate the adsorption of LOF. This structure is quite different from that of the microspheres obtained via traditional hot-drying, which have a dense structure [25][26][27]. This difference demonstrates that freeze-drying is an useful technique for the preparation of porous materials.…”

Section: Sem Analysismentioning

confidence: 75%

“…In addition, it can be inferred that -NH2 originating from CS will be protonated to -NH3 + by -COOH originating from LOF and that there is an electrostatic interaction between CS and LOF [15,28]. Furthermore, a π-π stacking interaction can also form between the aromatic structure of GO and LOF [25,26]. All of these intermolecular interactions will improve the adsorption performance of the obtained GO/CS aerogel microspheres.…”

Section: Ftir Analysismentioning

confidence: 97%

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Adsorption of Levofloxacin onto Graphene Oxide/Chitosan Composite Aerogel Microspheres

Miao,

Gao,

Han

et al. 2024

Gels

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The removal of pharmaceutical residues from water resources using bio-based materials is very important for human safety and health. Bio-based graphene oxide/chitosan (GO/CS) aerogel microspheres were fabricated with emulsification and cross-linking, followed by freeze drying, and were used for the adsorption of levofloxacin (LOF). The obtained GO/CS aerogel microspheres were characterized with scanning electron microscopy (SEM), Fourier-transform infrared (FTIR), and thermogravimetry (TG). The effects of GO content, pH value, and temperature on their adsorption capacity were investigated. With the incorporation of 40 wt% GO, the adsorption capacity increased from 9.9 to 45.6 mg/g, and the highest adsorption capacity, 51.5 mg/g, was obtained at pH = 8 and T = 25 °C. In addition, to obtain deeper insight into the adsorption process, the thermodynamics and kinetics of the process were also investigated with four different models of LOF adsorption. The thermodynamic modeling results revealed that LOF adsorption is exothermic, and the kinetic investigation demonstrated that LOF adsorption is generally consistent with a pseudo-first-order rate law.

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Section: Sem Analysismentioning

confidence: 75%

Section: Ftir Analysismentioning

confidence: 97%

Adsorption of Levofloxacin onto Graphene Oxide/Chitosan Composite Aerogel Microspheres

Miao,

Gao,

Han

et al. 2024

Gels

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“…Adsorption, among the techniques, is the most powerful, economical, and efficient technique utilized to decontaminate dyes from wastewater at low concentrations due to its simplicity, low cost, and not requiring advanced technology [ 10 , 11 , 12 , 13 ]. During this year, novel adsorbent materials have been reported to remove toxic dyes such as methylene blue from wastewater [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Activated carbon (AC) is one of the most traditional, effective, and extensively utilized adsorbents in adsorption technologies, and it is among the cheapest sorbents in market.…”

Section: Introductionmentioning

confidence: 99%

A Novel P@SiO2 Nano-Composite as Effective Adsorbent to Remove Methylene Blue Dye from Aqueous Media

et al. 2023

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This work aims to prepare a novel phosphate-embedded silica nanoparticles (P@SiO2) nanocomposite as an effective adsorbent through a hydrothermal route. Firstly, a mixed solution of sodium silicate and sodium phosphate was passed through a strong acidic resin to convert it into hydrogen form. After that, the resultant solution was hydrothermally treated to yield P@SiO2 nanocomposite. Using kinetic studies, methylene blue (MB) dye was selected to study the removal behavior of the P@SiO2 nanocomposite. The obtained composite was characterized using several advanced techniques. The experimental results showed rapid kinetic adsorption where the equilibrium was reached within 100 s, and the pseudo-second-order fitted well with experimental data. Moreover, according to Langmuir, one gram of P@SiO2 nanocomposite can remove 76.92 mg of the methylene blue dye. The thermodynamic studies showed that the adsorption process was spontaneous, exothermic, and ordered at the solid/solution interface. Finally, the results indicated that the presence of NaCl did not impact the adsorption behavior of MB dye. Due to the significant efficiency and promising properties of the prepared P@SiO2 nanocomposite, it could be used as an effective adsorbent material to remove various cationic forms of pollutants from aqueous solutions in future works.

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“…Alginate composites, conversely, are most often tested in environmental protection as effective sorbents for organic and inorganic pollutants. Existing data indicate that these materials are most used as adsorbents for dyes [ 13 , 14 , 36 , 37 ] and metal ions [ 14 , 38 , 39 ]. Concurrently, the studies on removal of drugs from aqueous solutions in systems with alginate beads are rare.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Non-Steroidal Anti-Inflammatory Drugs on Alginate-Carbon Composites—Equilibrium and Kinetics

Wasilewska

Deryło–Marczewska

2022

Materials

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In this work, alginate–carbon composites with different active carbon content were synthesized and studied by various techniques. The obtained materials can be used as adsorbents in the processes of removing organic pollutants from water. In this study, the effect of the immobilization of activated carbon in calcium alginate was investigated. Textural properties were determined by measuring low-temperature nitrogen adsorption/desorption isotherms. The largest specific surface area was recorded for ALG_C8 and amounted to 995 m2/g. The morphology of alginate materials was determined on the basis of scanning electron microscopy. The adsorption properties were estimated based on the measurements of equilibrium and adsorption kinetics. The highest sorption capacities were 0.381 and 0.873 mmol/g for ibuprofen and diclofenac, respectively. The generalized Langmuir isotherm was used to analyze the equilibrium data. A number of equations and kinetic models were used to describe the adsorption rate data, including first (FOE) and second (SOE) order kinetic equations, 1,2-mixed-order kinetic equation (MOE), fractal-like MOE equation (f-MOE), multi-exponential equation (m-exp), in addition to diffusion models: intraparticle diffusion model (IDM) and pore diffusion model (PDM). Thermal stability was determined on the basis of data from thermal analysis in an atmosphere of synthetic air.

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Facile Synthesis of Sustainable Tannin/Sodium Alginate Composite Hydrogel Beads for Efficient Removal of Methylene Blue

Cited by 17 publications

References 37 publications

Adsorption of Levofloxacin onto Graphene Oxide/Chitosan Composite Aerogel Microspheres

Adsorption of Levofloxacin onto Graphene Oxide/Chitosan Composite Aerogel Microspheres

A Novel P@SiO2 Nano-Composite as Effective Adsorbent to Remove Methylene Blue Dye from Aqueous Media

Adsorption of Non-Steroidal Anti-Inflammatory Drugs on Alginate-Carbon Composites—Equilibrium and Kinetics

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