Characterization and adsorption mechanism of ZrO2 mesoporous fibers for health-hazardous fluoride removal

Yu, Zhichao; Xu, Chonghe; Yuan, Kangkang; Gan, Xinzhu; Feng, Cong; Wang, Xinqiang; Zhu, Luyi; Zhang, Guanghui; Xü, Dong

doi:10.1016/j.jhazmat.2017.12.024

Cited by 140 publications

(37 citation statements)

References 40 publications

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“…However, burning of PVP has probably raised the local temperature of material above the set 350 C resulting in monoclinic peaks with lower intensities since ZrO 2 is known to transforms from amorphous to tetragonal and nally to monoclinic structure during the calcination process with increasing temperature. 15,41,42 The broadening of the FZR peaks is probably due to a small crystallite size of ZrO 2 crystallites in the material but the peaks are nonetheless sharp compared to the GZR peak. A rough estimation of the crystallite sizes was calculated using Scherrer's equation.…”

Section: Structural and Chemical Analysismentioning

confidence: 99%

Submicron fibers as a morphological improvement of amorphous zirconium oxide particles and their utilization in antimonate (Sb(v)) removal

et al. 2019

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Section: Structural and Chemical Analysismentioning

confidence: 99%

Submicron fibers as a morphological improvement of amorphous zirconium oxide particles and their utilization in antimonate (Sb(v)) removal

et al. 2019

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“…However, little is known about how anionic contaminants can influence the agricultural crops and in turn alter the agricultural products. There are some reports indicating that fluoride can inhibit enzyme activity of plants that involved in DNA transcription and replication processes [8,9]. In addition, fluoride can also interfere with proteins and disrupt the metabolism, pespiration and photosynthesis of plants [10].…”

Section: Introductionmentioning

confidence: 99%

Layered double hydroxide functionalized biomass carbon fiber for highly efficient and recyclable fluoride adsorption

et al. 2019

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The removing of fluoride from water is highly desired from the viewpoint of environmental protection and sustainable development due to the adverse impacts on human and ecosystem. In this study, the hierarchical porous layered double hydroxide (LDH)/biomass carbon fiber (BCF) has been successfully fabricated by the combined sol-gel, carbonization and hydrothermal processes using sustainable bamboo fibers as raw material based on the assembly the LDH nanosheets on BCF surfaces. Structural characterization indicates that the LDH nanosheets were attached to the BCF surface via in situ crystal growth. N 2 sorption measurements show that the LDH/BCF has relatively uniform accessible mesochannel size of 3.56 nm, and the surface area is as high as 39.89 m 2 /g. The resulting LDH/BCF exhibit a noticeable enhanced adsorption capacity for fluoride removal compared to that of Al 2 O 3 /BCF, accompanied by 15.21 mg/g of the adsorption capacity. The presence of the high negative charge anions had negligible influence on fluoride adsorption. Importantly, recovery adsorption capacity for fluoride was obtained for LDH/BCF for 5 consecutive cycles without a significant decrease in its adsorption properties. Therefore, the current research can offer a green approach to fabricate LDH/BCF with hierarchical structures for efficient removing fluoride from water, and the fabricated LDH/BCF will be an excellent candidate for pollution control based on the synergistic effects of BCF and LDH, high adsorption properties with good reusability. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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“…The combination of O and Zr in crystalline ZrO 2 is closer than that of the bridging oxygen structure, resulting in an increase in the binding energy. The peak at approximately 531.37‐531.69 eV corresponds to Zr–OH (terminal hydroxyl) . We believed that the bridging oxygen and terminal hydroxyl oxygen were cross‐linking for the formation of amorphous and three‐dimensional gel structures that are the key factors for keeping integrity of ZrO 2 precursor fibers during heat treatment.…”

Section: Resultsmentioning

confidence: 99%

Effect of high‐pressure vapor pretreatment on the microstructure evolution and tensile strength of zirconia fibers

et al. 2019

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High-strength zirconia (ZrO 2 ) continuous fibers, which are potential candidates as ultra-high temperature thermal insulators and reinforced materials, are typically fabricated by dry spinning an organozirconium precursor. However, the uncontrolled decomposition of organozirconium precursor usually occurs upon heat treatment that breaks the continuous fibers into pieces, resulting in the loss of tensile strength.Herein, in this contribution, we aimed to maintain the integrity of ZrO 2 precursor fibers during heat treatment. For this purpose, novel high-pressure vapor (HPV) pretreatment of ZrO 2 precursor fiber was introduced. The HPV pretreatment is considered to be efficient for the removal of the organics in precursor, promoting the formation of amorphous structures of Zr(OH) 4 and Zr(OH) 3 HCO 3 . Combining the studies of microstructures and tensile strengths, it was found that the amorphous structures played roles of cross-linking points, keeping the fibers integrity during the followed heat treatment. After HPV pretreatment, the high-strength ZrO 2 continuous fibers would be obtained by direct sintering in air without any atmosphere which substantially lowered the cost. The tensile strengths of sintered ZrO 2 continuous fibers pretreated by an optimized HPV procedure could reach up to as high as 1.299 GPa. The HPV pretreatment method provides a high-efficiency, low-cost technique for preparing high-quality ceramic fibers. K E Y W O R D Shigh-pressure vapor pretreatment, polyaceticzirconium, tensile strength, transition process

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Characterization and adsorption mechanism of ZrO2 mesoporous fibers for health-hazardous fluoride removal

Cited by 140 publications

References 40 publications

Submicron fibers as a morphological improvement of amorphous zirconium oxide particles and their utilization in antimonate (Sb(v)) removal

Submicron fibers as a morphological improvement of amorphous zirconium oxide particles and their utilization in antimonate (Sb(v)) removal

Layered double hydroxide functionalized biomass carbon fiber for highly efficient and recyclable fluoride adsorption

Effect of high‐pressure vapor pretreatment on the microstructure evolution and tensile strength of zirconia fibers

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