INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
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IF 4.784
Huayong Luo,Xueyang Zeng,Peng Liao,Hongwei Rong,Tian C. Zhang,Z. Jason Zhang,Xiangchao Meng
Currently, there is a growing trend in employing natural biomaterials (e.g., alginate) to prepare a novel bead adsorbent for phosphorus (P) elimination. However, the utilization of alginate beads to remove and recover P from effluents possesses limitations associated with its physical characteristics such as a dense gel layer, poor mechanical strength and low stability. To overcome the limitations and improve the adsorption performances, we synthesized a novel alginate-derived bead constituted of PNIPAM network interpenetrated in alginate-Zr 4+ network (PNIPAM/SA-Zr) decorated with polyethylene glycol as a pore-forming agent, and then investigated its ability to remove and recover P from effluents. The morphology, functional groups, surface area, and mechanical strength of the beads were evaluated by SEM, FTIR , BET, and swelling analysis. The adsorption of P was investigated by varying various factors. The adsorption kinetics , isotherms, and thermodynamics were studied. Particularly, the P-loaded beads exhibited a faster desorption rate under thermal stimulus, and remained good desorption efficiency and reusability within five consecutive cycles. Zeta-potential and XPS results revealed that the adsorption mechanisms were related to electrostatic interactions, ligand exchange, and the formation of inner-sphere complexes. The beads possessed favorable fixed-bed column operation performances for P removal and recovery from real wastewater.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Jinliang Song,Chao Xie,Zhimin Xue,Tiejun Wang
Meerwein–Ponndorf–Verley (MPV) reduction of biomass-derived carbonyl compounds is a greatly promising route for biomass valorization. Robust, facile-prepared, and cost-effective inorganic Zr-based catalysts for this transformation remain highly desirable. Herein, Zr-containing montmorillonite (denoted as Zr-MMT) was constructed by the ion exchange of Zr4+ with the interlayer cations of montmorillonite (MMT). Very interestingly, as an inorganic catalyst, the prepared Zr-MMT showed high catalytic activity for MPV reduction of various biomass-derived carbonyl compounds. Systematic investigations revealed that the excellent performance of Zr-MMT predominantly originated from more positively charged Zr species ([Zrx(OH)y(H2O)n](4x−y)+), which could boost the activation of the carbonyl group and simultaneously promote the hydrogen transfer process assisted by suitable basic sites on MMT. Notably, the preparation of Zr-MMT avoided the utilization of surfactants or expensive organic ligands, and the prepared Zr-MMT showed better or comparable catalytic performance than most reported Zr-containing catalysts, significantly enabling it to be more practical.
研究领域:
催化化学
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材料科学
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可再生能源
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Chunzi Xu,Yunlan Xu,Dengjie Zhong,Haixing Chang,Jiaxin Mou,Hui Wang,Hongyu Shen
In order to improve the stability, electrostatic interaction and ion exchange ability of chitosan for Cr (VI) removal, it is an effective strategy to introduce polyvalent metal ions and polymers into chitosan molecular chain through crosslinking. In this paper, Zr 4+ and glutaraldehyde crosslinked polyethyleneimine functionalized chitosan (CGPZ) composite was successfully synthesized and characterized by XRD, SEM, FTIR , BET, and XPS . The results showed that polyethyleneimine was successfully grafted onto chitosan by Schiff base reaction, while the appearance of Zr O and Zr N bonds verified the successful preparation of CGPZ. The monolayer maximum adsorption capacity of Cr(VI) by CGPZ was 593.72 mg g −1 at 298 K and t = 210 min. The removal efficiency of 100 mg L −1 Cr(VI) reached 95.7 %. The thermodynamic, isotherm and kinetic results show that the adsorption process of Cr (VI) by CGPZ is a spontaneous endothermic process controlled by entropy, which accords with Freundlich model and pseudo-second-order kinetic model. The regeneration experiments show that both HCl and NaOH can effectively desorb Cr(III) and Cr(VI) from the adsorbent surface, and the adsorbent has good acid-base resistance and regeneration performance. The removal of Cr(VI) mainly involves electrostatic attraction, ion exchange, reduction and complexation. CGPZ can synergistically adsorb Cr(VI) by electrostatic interaction of -NH 2 /-C=N and ion exchange of Cl − ion in the center of Zr, then reduce Cr(VI) to Cr(III) (45.4 % at pH = 2.0) by the -OH group on its surface, and chelate Cr(III) through COO- and -NH- groups.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2016
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IF 2.628
Qi Sun,Xianglan Xu,Honggen Peng,Xiuzhong Fang,Wenming Liu,Jiawei Ying,Fan Yu,Xiang Wang
A series of SnO 2 -based catalysts modified by Mn, Zr, Ti and Pb oxides with a Sn/M (M = Mn, Zr, Ti and Pb) molar ratio of 9/1 were prepared by a co-precipitation method and used for CH 4 and CO oxidation . The Mn 3+ , Zr 4+ , Ti 4+ and Pb 4+ cations are incorporated into the lattice of tetragonal rutile SnO 2 to form a solid solution structure. As a consequence, the surface area and thermal stability of the catalysts are improved. Moreover, the oxygen species of the modified catalysts become easier to be reduced. Therefore, the oxidation activity over the catalysts was improved, except for the one modified by Pb oxide. Manganese oxide demonstrates the best promotional effects for SnO 2 . Using an X-ray diffraction extrapolation method, the lattice capacity of SnO 2 for Mn 2 O 3 was 0.135 g Mn 2 O 3 /g SnO 2 , which indicates that to form stable solid solution, only 21% Sn 4+ cations in the lattice can be maximally replaced by Mn 3+ . If the amount of Mn 3+ cations is over the capacity, Mn 2 O 3 will be formed, which is not favorable for the activity of the catalysts. The Sn rich samples with only Sn-Mn solid solution phase show higher activity than the ones with excess Mn 2 O 3 species.
研究领域:
催化
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材料科学
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化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2026
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IF 8.4
Shuo Li,Wenshuo Hou,Xuting Li,Chuanlong Li,Tao Han,Xinzhao Yue,Fulu Chu,Linrui Hou,Changzhou Yuan
Composite solid-state electrolytes (CSEs) are highly promising for lithium-metal batteries (LMBs) but suffer from low ionic conductivity, limited mechanical strength, and unstable interfaces with lithium metal. A multi-functional perovskite filler, Li 0.33 La 0.56 Ti 0.95 Al 0.01 Zr 0.04 O 3 (AZ-LLTO), is incorporated into a solid polymer electrolyte. This filler is engineered via an Al 3+ /Zr 4+ co-doping strategy that synergistically optimizes bulk and grain boundary properties, enabling simultaneous enhancement of bulk ion transport and stabilization of the Li/electrolyte interface. Al 3+ doping generates oxygen vacancies facilitating Li + migration through the perovskite lattice, thereby enhancing bulk ionic conductivity. Concurrently, Zr 4+ doping suppresses La 3+ segregation at grain boundaries, reducing interfacial resistance and favoring Li + transport across grain boundaries. The resultant AZ-LLTO-based composite solid electrolyte achieves a high room-temperature ionic conductivity of 2.3 × 10 −4 S cm −1 , a Li + transference number of 0.42, and stable Li deposition/stripping in Li/CSE-AZ-LLTO/Li symmetric cells for over 3100 h at 0.1 mA cm −2 . Thus, LiFePO 4 /CSE-AZ-LLTO/Li battery delivers an initial capacity of 146.9 mAh g −1 at 0.2 C and retains 85% of its capacity after 200 cycles, demonstrating the practical viability of this designed co-doped perovskite filler. Our work establishes a rational co-doping paradigm for perovskite-based fillers to concurrently enhance bulk conduction and interfacial compatibility in CSEs for next-generation LMBs.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Chen Yu,Zhenyi Jiang,Junyi Han,Chaojun Yue,Meng Wei,Wenqin Wang,Tao Chen,Wei Lu
With the growing demand for information security, luminescent hydrogels with time dependence are highly required. However, the insufficient encryption sophistication and poor rewritability still hinder their application exploration in various scenarios. Herein, reversible multi-responsive fluorescent hydrogels with time-dependent information displays are successfully developed based on a dynamic coordinated interaction strategy. The fluorescent hydrogels are prepared by penetrating pyridine-dihydrazone-crosslinked oxidized dextran into poly(vinyl alcohol) networks. Fluorescent quenching and enhancement are achieved by dynamically controlling the coordination interaction of pyridine-dihydrazone-based ligands with Fe 3+ and Zr 4+ via the intramolecular charge transfer (ICT) and coordination effect (CE) mechanism, respectively. Notably, distinct time-dependent fluorescent recoveries are found upon further treatment with H + , which is attributed to differential coordination energies of Fe 3+ and Zr 4+ with ligands. On the basis of multi-responsive distinct yet reversible fluorescence behavior, the encoded information loaded by Fe 3+ /Zr 4+ can be sequentially decrypted until erased under the treatment of H + over time. Moreover, excellent rewritability can be realized by the alternation of metal ions and acid. Ultimately, rewritable 2D and 3D anti-counterfeiting platforms with time dependence are established to improve the security level of information encryption. This work affords an inspiring approach to developing time-dependent information encoding systems with enhanced security and rewritability.
研究领域:
材料科学
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信息安全
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化学
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DOI
高影响因子
Materials Today Physics
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2026
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IF 9.3
Yaoning Bai,Zhonghang Xia,Mingwei Li,Yiwen Zhang,Huiming Ji
In this study, Ba 0.997 Gd 0.003 TiO 3 @(Ni,Mn)Nb 2 O 6 + x wt% CaZrO 3 (x=0.2, 0.3, 0.4, 0.5, 0.6) (BGT@(N,M)NO-CZO) dielectric ceramics with excellent performance are synthesized by a simple solid-state reaction method. The lattice distortion formed by the substitution of A site in the perovskite structure by rare earth Gd 3+ ions enhances the dielectric constant of BaTiO 3 (BT) -based ceramics, while a single “core-shell” structure formed by niobate-coated (Shell-1) BGT improves the temperature stability in the low-temperature range. The dielectric constant of BGT@(N,M)NO ceramic reaches about 4500, and the temperature stability meets X7R. More importantly, for further optimize the dielectric properties, an isovalent co-dopant CaZrO 3 is added to the BGT@(N,M)NO ceramic to enhance high temperature stability. In different regions of BT matrix, Zr 4+ replaces Ti 4+ at the B site in the region between the Shell-1 and the core phase to form Shell-2, while Ca 2+ replaces Ba 2+ at the A site mainly in the core phase. Moreover, the double “core-shell” structure BGT@(N,M)NO-CZO ceramics generate internal stress and strong interionic interactions in lattice, leading to a shift in the Curie temperature toward higher temperatures, which enhances the temperature stability of BT-based ceramics between 145 °C to 155 °C range. Therefore, BGT@(N,M)NO-CZO (0.3 wt%) ceramic maintains high dielectric constant (ε r =4852) while extending temperature stability to X8R. Additionally, the dielectric loss of BGT@(N,M)NO-CZO (0.3 wt%) ceramic is reduced to 0.98%, and the room temperature resistivity and breakdown strength are reached 10 10 Ω·m and 89.1 kV/cm, respectively. The DFT calculation results further indicate that high dielectric constant and wide temperature stability correspond Gd 3+ -doped BT and (Zr 4+ , Ca 2+ ) isovalent co-doped BT. Ultimately, the double “core-shell” structure BGT@(N,M)NO-CZO ceramics with excellent dielectric properties are obtained via isovalent co-doping effect, rare earth ion doping effect and “core-shell” effect, which further expands the application of BT-based ceramics in the fields of electronic material and device.
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高影响因子
JOURNAL OF RARE EARTHS
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2022
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IF 4.632
Haitao Lv,Yanmin Wang,Zhidong Pan,Xiangyu Li,Yehong Zhang
Eu 2+ , Dy 3+ and Zr 4+ ions co-doped strontium aluminate (i.e., SrAl 2 O 4 :Eu 2+ ,Dy 3+ ,Zr 4+ )/molybdate (i.e., Ho 2 MoO 6 or Nd 2 MoO 6 ) with photo-/mechano-luminescence and allochroic effect as multi-optical functional hybrid pigments were prepared via solid state reactions and subsequent mixing. The phosphor and hybrid pigments were characterized by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy, ultraviolet–visible spectroscopy, L∗a∗b∗ color scale analysis, spectrophotometry and mechanoluminescent measurement. The results show that the optimum luminescent emission intensity of SrAl 2 O 4 :Eu 2+ ,Dy 3+ ,Zr 4+ phosphor can be obtained when 5 mol% Zr 4+ ions is doped into the lattice. Under the excitation of 365 nm wavelength, the hybrid pigments prepared with the phosphor and molybdate at a mass ratio of 1:1 present a green broad band emission located at 460–650 nm due to 4f 6 5d 1 →4f 7 transitions of Eu 2+ ions. The hybrid pigments have the superior mechanoluminescent property and emit light after being exerted by mechanical stresses. Besides, the hybrid pigments also exhibit an allochroic effect under different illuminants. In addition, the anti-counterfeiting of the hybrid pigments as a promising application was also presented.
研究领域:
材料科学
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光学
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 24
·54557-54565
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IF 5.1
Minghao Xu,Kaihui Hua,Bo Di,Yu Zheng,Qun Zeng,Pinhai Gao,Xiuan Xi
BaTiO 3 (BT)-based ceramics have recently become one of the most promising lead-free piezoelectric ceramics . However, its overall performance still falls short of meeting the demands for multifunctional applications. Although phase boundary regulation can enhance the piezoelectric properties , BT ceramics have very separate phase transition temperatures for different phases. This leads to the difficulty of achieving multiphase coexistence at room temperature (RT). In this work, based on doping 0.08 mol Zr 4+ , the lead-free Ba 1- x Sr x Ti 0.92 Zr 0.08 O 3 [ x = 0, 0.04, 0.08, 0.12, 0.16, 0.20 (mol), B 1- x S x TZ] piezoelectric ceramics were prepared using the solid-state reaction method, and the effect of the Sr 2+ doping level on the multiphase structural evolution and piezoelectric properties was systematically investigated. The results demonstrated that with the increase in the Sr 2+ doping content, multiphase coexistence within the B 1- x S x TZ ceramics was successfully achieved at RT. Moreover, it showed significant synergistic improvements in piezoelectric, dielectric , and electric-field-induced strain properties. At the doping level of about x = 0.16 mol, the key performance metrics of the piezoelectric ceramics were optimal. The d 33 at room temperature reached ∼447 pC/N, k p ∼0.49, and ε r ∼4649. Under an applied electric field of 10 kV/cm, S pos was ∼0.092 %, and d 33 ∗ was ∼895 p.m./V. Therefore, this study provides new insights into the progress of advanced lead-free piezoelectric materials for multifunctional applications.
研究领域:
材料科学
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陶瓷与复合材料
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压电材料
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固体物理
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功能材料
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DOI
高影响因子
ACS Omega
·
2023
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IF 4.1
Muhammad Anas,Asad Ali,Abdul Ghaffar Khan,Aiyeshah Alhodaib,Abid Zaman,Tanveer Ahmad,Vineet Tirth,Ali Algahtani,Shohab Ahmad,Barno Sayfutdinovna Abdullaeva,Tawfiq Al-Mughanam,Muhammad Aslam
In this work, new compositions of Sr0.8Mg0.2(Sn1–xZrx)O3 0.00 ≤ x ≤ 0.06 ceramics are designed and synthesized by the conventional solid-state route. The influence of Zr doping on the phase, microstructural, optical, and dielectric properties is thoroughly investigated. The peaks (0 0 4) and (1 1 0) are observed to shift toward lower 2θ values, due to the variation of the ionic radius between Zr4+ and Sn4+. X-ray diffraction patterns reveal the orthorhombic structure with the space group Pbnm. Scanning electron microscopy images reveal the presence of pores and particles with a high degree of agglomeration. The functional groups and modes of vibration are determined by Fourier transform infrared spectroscopy of the prepared metal oxide samples. The existence of green emission of all the synthesized samples around 554.91 nm is identified by photoluminescence spectroscopy. The dielectric properties of the fabricated samples are measured by using an impedance analyzer. The values of the tangent loss and relative permittivity are found to decrease with increasing frequency.
研究领域:
材料科学
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物理化学
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DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2026
·
IF 6.3
Yaozhi Wang,Bingchu Mei,Tao Xu,Weiwei Li,Hao Wu,Jian Chen,Wei Jing
Tb 2 O 3 -based transparent ceramics are promising for laser-system Faraday isolators due to their excellent magneto-optical properties. However, residual porosity from sintering impairs optical quality, thus limiting the practical application. This core challenge derives from the intrinsic trade-off between pore elimination and grain growth. In this work, an aliovalent Zr 4+ /Ca 2+ co-doping strategy was adopted to regulate densification and grain-boundary migration. The Tb 2 O 3 -based ceramics were fabricated using pre-sintering followed by hot isostatic pressing. Microstructural characterization confirmed that Zr 4+ inhibited excessive sintering grain growth, while Ca 2+ promoted ceramic densification. The optimized ceramic doped with 1.0 at.% Zr 4+ and 0.18 at.% Ca 2+ achieved high in-line transmittances of 79.67% at 1064 nm and 75.39% at 650 nm. The Verdet constant at 650 nm was −366.85 rad·T −1 ·m −1 . These results demonstrated that Zr 4+ /Ca 2+ co-doping effectively promoted pore elimination while controlling grain growth, thereby improving the optical quality of Tb 2 O 3 -based magneto-optical ceramics.
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高影响因子
ACS Omega
·
2026
·
IF 5.2
Panpan Xu,Xiaole Qiu,Bing Sun,Li Sun,Ensi Cao,Wentao Hao
Abstract Colossal permittivity (In,Nb) codoped TiO2 ceramics are promising for microelectronic applications but suffer from high low-frequency dielectric loss primarily due to leakage currents across grain boundaries. This work demonstrates that Zr4+ doping at Ti-sites in (In0.5Nb0.5)0.05Ti0.95O2 effectively mitigates this issue. A series of (In0.5Nb0.5)0.05Ti0.95-xZrxO2 (x = 0–0.20) ceramics were synthesized via solid-state reaction. Zr4+ incorporation refines grain size from ∼56.1 μm (undoped) to ∼2.5 μm (x = 0.20) and promotes the precipitation of an insulating ZrTiO4 secondary phase at grain boundaries for compositions with x ≥ 0.10. These microstructural modifications synergistically enhance the grain boundary resistance, which peaks at 10.50 × 106 Ω·cm for the x = 0.10 composition, nearly an order of magnitude higher than the undoped ceramic. Consequently, the low-frequency dielectric loss is significantly reduced, with the x = 0.10 composition sintered at 1450 °C exhibiting a minimal loss tangent. Complex impedance analysis reveals the introduction of a new interfacial polarization associated with the ZrTiO4/INTO phase boundaries. XPS analysis confirms that Zr doping suppresses oxygen vacancy concentration without altering the Ti3+/Ti4+ ratio crucial for electron-pinned defect dipoles. The optimized composition (x = 0.10) also shows improved nonlinear coefficient (α = 2.8) and breakdown field (Eb = 530 V/cm), alongside stable low loss (tanδ < 0.05) over a broad temperature range at 1 kHz. This study presents a viable defect-engineering strategy utilizing Zr4+ doping to achieve low-loss colossal permittivity in (In,Nb) codoped TiO2-based ceramics for practical applications.
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高影响因子
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