Conversion of Volcanic Tephra to Zeolites for Calcium Ion Cross-Linked Alginate-Zeolite Composites for Enhanced Aqueous Removal of Cu(II) Ions

Wang, Yifan; Luo, Min; Xu, Fang; Zhang, Wenzhong

doi:10.1007/s11270-015-2554-8

Cited by 7 publications

(1 citation statement)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Clays and zeolites are generally considered to be non-toxic when ingested [14]. Several applications for alginateclay and alginate-zeolite nanocomposites have been reported [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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

Fernandes

Moura

Glenn

et al. 2018

Journal of Molecular Liquids

121

View full text Add to dashboard Cite

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.

show abstract

“…Clays and zeolites are generally considered to be non-toxic when ingested [14]. Several applications for alginateclay and alginate-zeolite nanocomposites have been reported [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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

Fernandes

Moura

Glenn

et al. 2018

Journal of Molecular Liquids

121

View full text Add to dashboard Cite

show abstract

Magnetic chitosan/sodium alginate gel bead as a novel composite adsorbent for Cu(II) removal from aqueous solution

Tao

Zhang

et al. 2018

Environ Geochem Health

View full text Add to dashboard Cite

Using sodium alginate hydrogel as skeleton, in combination with chitosan and magnetic FeO, a new type of magnetic chitosan/sodium alginate gel bead (MCSB) was prepared. Adsorptive removal of Cu(II) from aqueous solutions was studied by using the MCSB as a promising candidate in environmental application. Different kinetics and isotherm models were employed to investigate the adsorption process. Based on Fourier transform infrared spectroscopy, field-emission scanning electron microscope, CHNS/O elements analysis, vibration magnetometer, and various means of characterization, a comprehensive analysis of the adsorption mechanism was conducted. The MCSB had a good magnetic performance with a saturation magnetization of 12.5 emu/g. Elemental analysis proved that the addition of chitosan introduced a considerable amount of nitrogen-rich groups, contributing significantly to copper adsorption onto gel beads. The contact time necessary for adsorption was optimized at 120 min to achieve equilibrium. Experimental data showed that the adsorption process agreed well with the Langmuir isotherm model and the pseudo-second-order kinetics model. The theoretical maximum adsorption capacity of MCSB for Cu(II) could reach as high as 124.53 mg/g. In conclusion, the MCSB in this study is a novel and promising composite adsorbent, which can be applied for practical applications in due course.

show abstract

Tailored Natural Polysaccharides Beads as Green Sorbents for Efficient Lysozyme Adsorption

Wei

et al. 2017

J Polym Environ

View full text Add to dashboard Cite

Conversion of Volcanic Tephra to Zeolites for Calcium Ion Cross-Linked Alginate-Zeolite Composites for Enhanced Aqueous Removal of Cu(II) Ions

Cited by 7 publications

References 41 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

Magnetic chitosan/sodium alginate gel bead as a novel composite adsorbent for Cu(II) removal from aqueous solution

Tailored Natural Polysaccharides Beads as Green Sorbents for Efficient Lysozyme Adsorption

Contact Info

Product

Resources

About