Sol-gel synthesis of mesoporous mixed oxides in the ZrO2-SiO2 system

Viter, V. N.

doi:10.1134/s1070427210020023

Cited by 4 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Shishmakov et al [ 22 ] synthesized ZrO 2 -SiO 2 xerogels through the hydrolysis of a mixture of tetrabutoxyzirconium and tetraethoxysilane in a desiccator in a vapor of a 15% aqueous NH 3 atmosphere. Viter [ 23 ] synthesized mixed oxide dry gels of ZrO 2 -SiO 2 from ZrOCl 2 -8H 2 O and tetraethylorthosilicate [Si(OEt) 4 ] by the sol–gel method. The synthesized gels had a substantially increased porosity with specific surface areas of 140–630 m 2 ·g −1 and pore volumes of 0.087–0.441 cm 3 ·g −1 .…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Modification of ZrO2-SiO2 Xerogel and Its Adsorption Properties to Rhodamine B

Liu

Yang

2022

Gels

View full text Add to dashboard Cite

Zirconium nitrate pentahydrate (Zr(NO3)4·5H2O) and tetraethyl orthosilicate (TEOS) are used as the zirconium source and silicon source, respectively, and methyltriethoxysilane (MTES) as the hydrophobic modifier; the hydrophilic and hydrophobic ZrO2-SiO2 xerogels were prepared successfully. The xerogels were characterized using Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and N2 adsorption–desorption measurement. The adsorption mechanism of hydrophobic ZrO2-SiO2 xerogels to RhB was described by the kinetic and adsorption isotherms. The results showed that the introduction of Si-CH3 groups can make the average pore size, BET surface area, and total pore volume of ZrO2-SiO2 xerogel increase. The hydrophobic ZrO2-SiO2 xerogel displays an adsorption capacity of 169.23 mg·g−1 for RhB dye at 25 °C and pH = 3. The adsorption process of hydrophobic ZrO2-SiO2 xerogel to RhB followed a pseudo–second-order kinetic model. Fitting results from the D–R model of adsorption indicate that the adsorption of RhB onto the hydrophobic ZrO2-SiO2 xerogels is mainly physical, accompanied by a spontaneous heat absorption process. The regeneration and recycling properties of hydrophobic xerogels were investigated, and their recoverability and reusability were demonstrated.

show abstract

Section: Introductionmentioning

confidence: 99%

Hydrophobic Modification of ZrO2-SiO2 Xerogel and Its Adsorption Properties to Rhodamine B

Liu

Yang

2022

Gels

View full text Add to dashboard Cite

show abstract

“…Fer в отношении Се 3+ обусловлена, скорее всего, более высоким содержанием в ее структуре сильных кислотных центров типа SiOH групп[22], осуществляющих связывание катионов металлов на основе обменного взаимодействия. Следует также отметить, что в области низких концентраций Се 3+ в растворе (1-5 мг/л), типичных для реальных жидких отходов, композиции…”

unclassified

Magnetic Composite Sorbents for Trapping Heavy Metals from Liquid Waste and Their Immobilization in a Mineral-Like Matrix

Черных

Соловьев

Chernykh

et al. 2019

Journal of Siberian Federal University. Chemistry

View full text Add to dashboard Cite

Magnetic sorbents were prepared by addition of ferrospheres to zirconia-silica gel followed by thermal treatment at 500 °C. The ferrosphere narrow fraction E -0.063+0.050 mm from fly ash resulted from combustion of Ekibastuz coal was used as a magnetic component. The surface of magnetic composites was additionally functionalized by grafting of – POONa and – NH2 groups. Under equilibrium conditions sorption capacities of the sorbents with respect to Се3+ used as a U4+/Th4+ simulator and Pb2+ were measured by means of determination of sorption isotherms which were fitted by the Langmuir model. It was established that extraction of Се3+ and Pb2+ from aqueous solutions is characterized by distribution coefficients of 104–106 ml/g. Temperature conditions for solid-phase crystallization of the sorbents resulting in polyphase systems with the content of zircon phase of 50 wt. % were found

show abstract

TiO2(SiO2)x and ZrO2(SiO2)x Cryogels as Catalysts for the Citronellal Cyclization to Isopulegol

2013

View full text Add to dashboard Cite

Sol-gel synthesis of mesoporous mixed oxides in the ZrO2-SiO2 system

Cited by 4 publications

References 16 publications

Hydrophobic Modification of ZrO2-SiO2 Xerogel and Its Adsorption Properties to Rhodamine B

Hydrophobic Modification of ZrO2-SiO2 Xerogel and Its Adsorption Properties to Rhodamine B

Magnetic Composite Sorbents for Trapping Heavy Metals from Liquid Waste and Their Immobilization in a Mineral-Like Matrix

TiO2(SiO2)x and ZrO2(SiO2)x Cryogels as Catalysts for the Citronellal Cyclization to Isopulegol

Contact Info

Product

Resources

About