Optimization of methylene blue using Ca2+ and Zn2+ bio-polymer hydrogel beads: A comparative study

Kumar, M.; Tamilarasan, R.; Arthanareeswaran, G.; Ismail, Ahmad Fauzi

doi:10.1016/j.ecoenv.2015.04.007

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…This residue was inorganic material that remained stable at high temperatures (800°C). Similar results were reported by Kumar et al [43], Eldin et al [44] and de Paula et al [45].…”

Section: Thermogravimetric (Tg) and Differential Thermogravimetric (Dsupporting

confidence: 91%

Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads

Fernandes

Moura

Glenn

et al. 2018

Journal of Molecular Liquids

112

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Polymeric hydrogels are important biomaterials with potential for various applications including the controlled release of drugs. Clay and zeolite nanostructures can enhance the absorption and release properties of hydrogels. In our previous work, a procedure was optimized for making hydrogel beads. The objectives of this study were to use the optimized bead forming procedure to prepare clay and zeolite nanocomposite hydrogel beads and characterize their microstructure, thermal and chemical properties. The hydrogels were prepared by dripping solutions of either sodium alginate or sodium alginate/nanostructure (clay and/or zeolite) into beakers containing different concentrations of CaCl 2 at 25°C. Fourier transform infrared spectroscopy (FTIR) analysis detected the presence of functional groups associated with alginate, clay and zeolite. The microstructure of the alginate beads was somewhat rough with small protrusions. Flakes were visible in micrographs of beads containing nanoclay. The elemental composition of the hydrogels was investigated by energy dispersive X-ray spectrometry (EDX). EDX spectra revealed magnesium, sodium, aluminum, silicon and increased the levels of oxygen in the nanoclay compositions. The incorporation of nanoclays decreased the percentage of organic matter lost as detected by thermogravimetric analysis (TG). TG was also able to detect the incorporation of nanoclay in hydrogels. The nanoclays proved to be more effective than zeolites in producing alginate hydrogels with satisfactory swelling characteristics.

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“…This residue was inorganic material that remained stable at high temperatures (800°C). Similar results were reported by Kumar et al [43], Eldin et al [44] and de Paula et al [45].…”

Section: Thermogravimetric (Tg) and Differential Thermogravimetric (Dsupporting

confidence: 91%

Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads

Fernandes

Moura

Glenn

et al. 2018

Journal of Molecular Liquids

112

View full text Add to dashboard Cite

show abstract

“…Finally, the 16% mass loss observed in the fourth stage with a temperature range between 337 and 700°C can be attributed to the decomposition of CaCO 3 into calcium oxide and carbon dioxide (CaO + CO 2 ) and to the oxidative degradation of minerals. Similar results were reported by Kumar et al 58 and Mohy Eldin et al 59 …”

Section: Resultssupporting

confidence: 90%

“…Finally, the 16% mass loss observed in the fourth stage with a temperature range between 337 and 700 C can be attributed to the decomposition of CaCO 3 into calcium oxide and carbon dioxide (CaO + CO 2 ) and to the oxidative degradation of minerals. Similar results were reported by Kumar et al 58 and Mohy Eldin et al 59 At the end of the last stage, hydrogel D1 and the control showed 37.9%-39.1% residual mass that was not decomposed due to the tests being performed in a nitrogen atmosphere.…”

Section: Discussionsupporting

confidence: 89%

Synthesis and characterization of hydrogels from alginate and ora‐pro‐nóbis (Pereskia aculeata Miller) mucilage

de Morais,

Ferreira,

de Oliveira Meira

et al. 2023

J of Applied Polymer Sci

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This study aimed to synthesize and characterize hydrogels prepared with alginate (ALG) and ora‐pro‐nobis mucilage (MOPN) by ionic gelation. The hydrogels were produced from solutions containing 0.5, 0.75, 1.0, and 1.25% (w/v) sodium alginate, 0.25, 0.5, 0.75, 1.0 and 1.25% (w/v) MOPN and 1.5 and 3.0% (w/v) CaCl2. The hydrogels were characterized in terms of mechanical strength, degree of swelling, morphology, chemical groups by Fourier transform infrared spectroscopy (FTIR) and x‐ray diffraction (XRD); and their thermal properties were assessed by differential scanning calorimetry (DSC) and thermogravimetric and differential thermal analysis (TG/DTA). The results indicated that MOPN acted with ALG in chain crosslinking, confirming its ability to interact with other polymers to form gels. The control hydrogel, composed of only ALG (1.5%), showed a more crosslinked and less amorphous structure with greater thermal resistance, while the hydrogel composed of ALG (1.25%) and MOPN (0.25%) showed a more amorphous, porous structure with lumps. However, these treatments were statistically equal in terms of mechanical strength and degree of swelling, indicating that ALG and MOPN hydrogels are an economically viable alternative to ALG‐only hydrogels, where 0.25% (w/v) of the ALG can be replaced by MOPN without significant changes in its mechanical and swelling properties.

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Recent Progress in Polysaccharide-Based Hydrogel Beads as Adsorbent for Water Pollution Remediation

Allouss

Makhado

Zahouily

2022

Springer Series in Materials Science

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Optimization of methylene blue using Ca2+ and Zn2+ bio-polymer hydrogel beads: A comparative study

Cited by 12 publications

References 34 publications

Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads

Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads

Synthesis and characterization of hydrogels from alginate and ora‐pro‐nóbis (Pereskia aculeata Miller) mucilage

Recent Progress in Polysaccharide-Based Hydrogel Beads as Adsorbent for Water Pollution Remediation

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