Journal of Physical Chemistry C
·
2021
·
IF 4.126
Xiaomei Chen,Mu He,Sheng Huang,Lei Zhang,Haizheng Zhong
Here, we fabricated Cs-rich and Pb-rich Cs4PbBr6 samples with green photoluminescence emission and investigated the difference between them. Both Cs-rich and Pb-rich Cs4PbBr6 samples show strong green emissions at about 520 nm; however, the photoluminescence excitation properties of the green emission are greatly different from each other in the ultraviolet region. The photoluminescence excitation spectra of the Cs-rich sample have a broad excitation band from 334 to 500 nm. In comparison, the Pb-rich sample has two additional excitation bands of 250–300 and 324–334 nm. By correlating the experimental data with the theoretical calculations, the green photoluminescence emission can be attributed to the embedded CsPbBr3 nanocrystals, and the interlayer between Cs4PbBr6 and CsPbBr3 nanocrystals plays an important role in determining their photoluminescence excitation properties. It was proposed that the existence of the CsBr interlayer between the Cs4PbBr6 matrix and embedded CsPbBr3 nanocrystals block the electron transfer of excited Cs4PbBr6 and induce photoluminesence quenching under excitation of 250–300 nm.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xue Wang,Hanping Zhang,Quanguo Zhai,Yucheng Jiang,Mancheng Hu,Shuni Li
In this work, the high-quality protonated Ni-doped MnO 2 (H–Ni–MnO 2 NRs) nanorods with a mean diameter of about 15 nm were synthesized by a hydrothermal method , which was successfully applied to Cs + adsorption under electrochemical process. The as-prepared H–Ni–MnO 2 NRs showed high selectivity to Cs + adsorption in both acidic and neutral media. In particular, the amount of Cs + adsorption increased with increasing solution pH. The adsorption capacity of H–Ni–MnO 2 NRs for Cs + could reach up to 11.5 mmol·g −1 at pH 7, much higher than previous reports (0.06–6 mmol·g −1 ). The high adsorption of H–Ni–MnO 2 NRs ability could be attributed to their especial morphology, Ni doping, and Mn(III) amount enhancement induced by electrochemical reduction .
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Inorganic Chemistry Frontiers
·
2020
·Vol. 8
·期 6
·1468-1475
·
IF 5.958
Ying Hou,Bingbing Zhang,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
Borophosphates are of current interest and great importance as ultraviolet (UV) and deep-UV optical functional materials. However, most of the borophosphates exclusively contain tetrahedral coordination of B and P atoms, i.e. BO4 and PO4. Few compounds contain mixed-coordinated groups, i.e. BO4, BO3 and PO4. A new strategy of large B/P ratios has been suggested to effectively synthesize three mixed-coordinated borophosphates, K3B4PO10 and K2MB4PO10 (M = Rb/Cs). Their structures all show 2D 2∞[B4PO10]3− sheets, which are separated by the alkali metal cations. The thermal behavior measurements indicate that K3B4PO10 and K2MB4PO10 (M = Rb/Cs) melt congruently and a crystal of K3B4PO10 with a size up to 4 × 2 × 1 mm3 has been grown. Property measurements show that they all possess deep-ultraviolet (UV) cut-off edges and a relatively large birefringence and are potential deep-UV birefringent crystals. In particular, the measured birefringence of K3B4PO10 is about 0.0445@532 nm, which is the largest in borophosphates with reported birefringence. This study indicates that B-rich borophosphates are promising systems to synthesize materials with large birefringence.
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CATALYSIS TODAY
·
2020
·
IF 5.825
Hongqin Ma,Yanan Guan,Wenyao Chen,Zhijun Sui,Gang Qian,De Chen,Xinggui Zhou,Xuezhi Duan
In this work, the support effects on vapor-phase aldol condensation of methyl acetate (MeOAc) with formaldehyde (HCHO) over cesium catalysts are understood by the employment of Al 2 O 3 with different morphologies and crystal phases. The structural and electronic properties of these supported Cs catalysts are characterized by multiple techniques, such as XRD, HAADF-STEM, EDS-mapping, XPS, NH 3 -TPD and CO 2 -TPD. The Cs species are found to be highly dispersed on the Al 2 O 3 surfaces, and their compositions vary with the identity of Al 2 O 3 . A combined catalyst characterization and testing results indicates a balance between acidic and basic sites, i.e., an acid-base synergy, for the production of MA: the excess acidic sites lead to the lower MA selectivity due to the promoted further condensation, while the excess basic sites with the lower MeOAc conversion due to the insufficient activated HCHO species. These insights could be valuable for the design and optimization of catalysts for this reaction.
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Science China-Materials
·
2024
·
IF 6.8
Ma Yanyan,Li Jifeng,Ding Tao,Feng Qichun,Du Zhaofang
Water loss rate is crucial in evaluating the efficiency of atmospheric water harvesting (AWH) materials. However, most moisture-absorbing salts and gels have fixed heat transfer rates, limiting the development of high-performance AWH materials. Herein, an anisotropic PEG/CS/MF nanocomposite (APCM) with adjustable thermal transfer efficiency is presented. APCM was synthesized using polyethylene glycol (PEG), melamine foam (MF), and chitosan (CS) solution through a freeze orientation method. The resulting material exhibits a stable oriented laminated structure formed by hydrogen bonding between PEG, CS, and MF. This unique structure imparts excellent mechanical properties. APCM’s large lamellar gaps and pore diameters enable rapid absorption of atmospheric water molecules at low temperatures without leakage (61.79 kg m −3 ). The compressible nature of APCM allows for efficient heat transfer at high temperatures, and the release of 80% of absorbed water within 15 min. In a proof-of-concept demonstration using a custom-built AWH device, each cubic meter of APCM achieved three AWH cycles within 24 h, producing over 185 kg of water. Therefore, this innovative design offers a promising solution for enhancing the efficiency of AWH, potentially addressing water scarcity issues in various regions.
研究领域:
材料科学
·
环境科学
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BIOCHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 3.978
Xing Sun,Zhiyuan Meng,Qingwen Yu,Xinyu Wang,Zheng Zhao
After an osteosarcoma excision, recurrence and bone defects are significant challenges for clinicians. Combination therapy based on a nanoparticle-based drug delivery system shows great promise in osteosarcoma therapy. In this study, we designed a multifunctional chitosan (CS) nanoparticle , which combined photothermal therapy (PTT) with chemotherapy to synergistically enhance osteosarcoma therapy and bone repair . Curcumin (CM) loaded CS nanoparticles were prepared through ionotropic gelation method and were further functionalized with polydopamine (PDA) coating to form CS-CM-PDA nanoparticles (CCPNPs). The CCPNPs displayed pH- and near-infrared (NIR)- responsive CM release behavior. In vitro anti-cancer results indicated that CCPNPs possessed a long-term stable anti-cancer effect compared to pure CM. The presence of the NIR irradiation combined with CCPNPs resulted in a dramatic decrease in MG-63 osteosarcoma cell viability in 10 min compared with the pure CCPNPs at the concentration of 500 μg/mL. Meanwhile, in vitro study demonstrated that CCPNPs induced MG-63 cell apoptosis via downregulating the expression of Bcl-2 and upregulating the expression levels of Bax and Caspase-3. Besides, CCPNPs could positively induce the proliferation of MC3T3-E1 osteoblast cells in vitro . These results suggested that CCPNPs with bifunctional osteosarcoma therapy and bone repair may be an excellent candidate for local cancer therapy and bone regeneration .
研究领域:
纳米技术
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肿瘤学
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生物医学工程
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再生医学
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Journal of the American Chemical Society
·
2018
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IF 14.357
Mei-Ling Feng,Debajit Sarma,Yu-Jie Gao,Xing-Hui Qi,Wei-An Li,Xiao-Ying Huang,Mercouri G. Kanatzidis
Unconventional ion exchangers can achieve efficient removal of [UO2]2+, Cs+, and Sr2+ ions from complex aqueous solutions and are of great interest for environmental remediation. We report two new gallium thioantimonates, [Me2NH2]2[Ga2Sb2S7]·H2O (FJSM-GAS-1) and [Et2NH2]2[Ga2Sb2S7]·H2O (FJSM-GAS-2), which present excellent ion exchange properties for [UO2]2+, Cs+, and Sr2+ ions. They exhibit high ion exchange capacities for [UO2]2+, Cs+, and Sr2+ ions (qmU = 196 mg/g, qmCs = 164 mg/g, and qmSr = 80 mg/g for FJSM-GAS-1, qmU = 144 mg/g for FJSM-GAS-2) and short equilibrium times for [UO2]2+ ion exchange (5 min for FJSM-GAS-1 and 15 min for FJSM-GAS-2, respectively). Both compounds display active ion exchange with [UO2]2+ in the pH range of 2.9–10.5. Moreover, the sulfide compounds could maintain high distribution coefficients KdU even in the presence of excess Na+, Ca2+, and HCO3–. The distribution coefficient KdU of 6.06 × 106 mL/g exhibited by FJSM-GAS-1 is the highest among the reported U adsorbents. The [UO2]2+-laden products can be recycled by conveniently eluting the uranium with a low-cost method. These advantages combined with facile synthesis, as well as β and γ radiation resistance, make FJSM-GAS-1 and FJSM-GAS-2 promising for selective separations in nuclear waste remediation.
研究领域:
环境科学
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材料科学
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核化学
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PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 7
·e70960
·
IF 4.2
Mingyang Zhao,Yupeng Jiao,Zhenfeng Tong
Sn-containing hollandite has been highlighted by recent machine learning-guided design as a promising host for radioactive cesium (Cs), yet waste form validation remains limited. Here, a Cs-bearing Sn-based hollandite series, (Ba,Cs) 1.66 (Fe,Sn) 8 O 16 , was synthesized in air by solid-state reaction, with hollandite formation at 1125°C followed by pressureless sintering at 1200°C. x-Ray diffraction confirms hollandite as the major phase across the series, with minor Ba-bearing secondary phases only at low Cs contents. Rietveld refinement reveals anisotropic lattice expansion and a tetragonal-to-monoclinic symmetry change at the Cs-rich end member, accompanied by progressive tightening of tunnel descriptors, indicating a Sn-specific Cs accommodation response distinct from many Ti-based hollandites. Chemical durability was evaluated by monolithic leaching in deionized water at 90°C. At Cs loadings up to ∼17 wt%, 7-day Cs release is comparable to representative Ti-based hollandites tested under similar conditions. Sn exhibits ultralow normalized release, while Cs and Ba show higher release without detectable degradation of the hollandite matrix. Extended 28-day interval leaching on Ba 0.8 Cs 0.86 Fe 2.46 Sn 5.54 O 16 (HS2) and Ba 0.4 Cs 1.26 Fe 2.06 Sn 5.94 O 16 (HS3) separates rapid early wash-off from slower, diffusion-controlled release. By 14–28 days, Cs and Ba leaching rates converge to ∼2–4 × 10 −2 g·m −2 ·day −1 , with effective diffusion coefficients of ∼1–2 × 10 −11 cm 2 /s and leaching indices of ∼11. Benchmarking against Ti-based hollandites places the Sn-based series within a competitive loading–durability window under a comparatively mild processing route, supporting Sn-based hollandite as a readily fabricated candidate for high-loading Cs immobilization.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Fei-Fei Wang,Yu-Hang Li,Ze-Jia Shen,Ze-Yu Wang,Lin Cheng,Shuaihua Wang,Kai-Yao Wang
Construction strategy for selenide exchanger by integrating T3 supertetrahedral clusters. • Synergistic effects of Se component and microporosity on the adsorption kinetics enhancement. • Efficient removal (up to 99.99%) of Cs + and Sr 2+ by column and ultrathin membrane. • High selectivity for Cs + and Sr 2+ in presence of excess coexisting cations and anions. • Great pH (3–12)/irradiation resistance, high exchange selectivity, and facile elution. Elimination of long half-lived 137 Cs + and 90 Sr 2+ hazards through adsorption technique is critical for environmental protection and human health. However, traditional adsorbents are limited in radioactive wastewater treatment by slow kinetics, weak anti-interference, and poor practical applicability. Herein, an indium selenide adsorbent Na 6 In 10 Se 18 ·11.5H 2 O ( InSe-1Na ), with an anionic framework constructed from corner-sharing T3 supertetrahedral clusters, was synthesized using a “assembly-activation” strategy. The soft basic Se component and the cluster-induced microporosity synergistically endow InSe-1Na with remarkable Cs + /Sr 2+ enrichment capacity. It exhibits ultra-fast adsorption kinetics, removing 97.84% of Cs + within 5 min and 99.84% of Sr 2+ within 20 min. The corresponding second-order rate constants ( k 2 ) are 10.241 and 0.335 g mg −1 min −1 , respectively, rendering it the fastest selenide adsorbent. InSe-1Na shows structural stability over a broad pH range of 3–12, with maximum distribution coefficients ( K d ) of 1.02 × 10 5 mL g −1 for Cs + and 8.29 × 10 5 mL g −1 for Sr 2+ . The maximum adsorption capacities ( q m ) of Cs + and Sr 2+ are 252.10 ± 3.77 and 86.49 ± 3.71 mg g −1 , respectively. It exhibits resistance to coexisting ions, maintaining a removal rate ( R ) ≥ 94.73% in the presence of 10 mmol L −1 Na + . Moreover, the rapid kinetic response facilitates its application in column ( R = 99.65%–99.99%) and membrane ( R = 98.95%–99.98%, 0.40 s contact time) filtrations for mixed Cs + and Sr 2+ flow. Given its straightforward synthesis, β/γ irradiation tolerance, and easy elution, InSe-1Na represents a promising adsorbent for radioactive decontamination. Deep purification of nuclear contaminated water containing radioactive 137 Cs + and 90 Sr 2+ is promisingly achieved by a supertetrahedral-cluster-constructed indium selenide ion exchanger, Na 6 In 10 Se 18 ⸱ 11.5H 2 O ( InSe-1Na ), whose soft Se component and microporosity endow this material with top-ranked adsorption kinetics (even in suction filtration conditions with 0.40 s contact time), high capacities, superior selectivity, good resistance to acid/base/coexisting ions, and remarkable column/membrane performances. Download: Download high-res image (131KB) Download: Download full-size image
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Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2026
·
IF 2.4
Ying Li,Xuemeng Li,Mingjie Han,Hailong Bai,Lei Ru,Jiying Men
The elevation of creatinine in the blood is a typical indicator of renal dysfunction, and persistent renal insufficiency can eventually develop into kidney failure, requiring patients to rely on dialysis or kidney transplantation to maintain their lives. This study focuses on the preparation and performance evaluation of a molecularly imprinted membrane, PVA@CS-MIPs, designed for selective adsorption of creatinine. The PVA@CS-MIPs membrane was fabricated using PVA/CScomposite base membrane prepared via solution casting, with α-methylacrylic acid (MAA) as the functional monomer, N,N′-methylenebisacrylamide (MBA) as the crosslinker, and cerium ammonium sulfate (ACS) and concentrated sulfuric acid as initiators. The PVA@CS-MIPs membrane was characterized using FT–IR, SEM, and XPS. The adsorption and permeation behaviors of PVA@CS-MIPs were investigated, and the underlying mechanisms were discussed. The results demonstrate that PVA@CS-MIPs exhibit a high adsorption capacity of 322.5 mg/g for creatinine and good adsorption selectivity. Moreover, the membrane exhibits excellent reusability. These findings suggest that the prepared PVA@CS-MIPs possesses specific recognition ability forcreatinine and hold promise for applications in hemodialysis-related fields.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Beibei Zhang,Lihua Zhang,Jin Li,Jiawen Fu,Xiwei Qu
In the present work, a series of PVA and CS blend membranes were studied. These prepared membranes were evaluated by binary mixture gases of CO 2 /N 2 and CO 2 /CH 4 . The optimum ratio of PVA/CS for CO 2 permeance was achieved at 5:5. It recorded a CO 2 permeability of 20.8 GPU (1 GPU = 1 × 10 -6 ·cm 3 (STP)·cm −2 ·s −1 ·cmHg −1 ) with CO 2 /N 2 selectivity of 89.7, as well as CO 2 permeability of 10.2 GPU and CO 2 /CH 4 selectivity of 56.3. Secondly, two kinds of nanoparticle UiO-66 and UiO-66-NH 2 were used to prepare mixed matrix membranes. The effects of nanofiller content and chemical groups on gas permselectivity were investigated. Results show that the addition of nanoparticles can effectively improve the permselectivity of membrane. The mixed matrix membranes addition with UiO-66-NH 2 achieved the optimum CO 2 performance and these were following the order of PVA(5)/CS(5)-UiO-66-NH 2 > PVA(5)/CS(5)-UiO-66 > PVA(5)/CS(5). For all these membranes, the permeance and selectivity present initial increased and then decreased. Mixed matrix membranes addition UiO-66-NH 2 (containing 3.75 wt%) exhibits a CO 2 permeance of 32.77 GPU and CO 2 /N 2 selectivity of 93.47, as well as CO 2 permeance of 25.57 GPU and CO 2 /CH 4 selectivity of 70.1, which was beyond the 2008 Robeson upper bound.
研究领域:
材料科学
·
环境科学
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MOLECULES
·
2024
·Vol. 29
·期 5
·1094
·
IF 4.2
Hui Liang,Yongxin Zhao,Tongjin Liu,Ruijuan Li,Rumei Li,Yuxiao Zhu,Feng Fang
Zn-doped MnCO3/carbon sphere (Zn-doped MnCO3/CS) composites were synthesized using a simple hydrothermal procedure. Among various samples (ZM-50, ZM-05, and ZMC-0), the ternary Zn-doped MnCO3/CS (ZMC-2) catalyst demonstrated excellent visible light-induced photocatalytic activity. This improvement comes from the Zn addition and the conductive CS, which facilitate electron movement and charge transport. The catalyst exhibited efficient degradation of methylene blue (MB) over a wide pH range, achieving a removal efficiency of 99.6% under visible light. Radical trapping experiments suggested that •OH and •O2−played essential roles in the mechanism of organic pollutant degradation. Moreover, the catalyst maintained good degradation performance after five cycles. This study offers valuable perspectives into the fabrication of carbon-based composites with promising photocatalytic activity.
研究领域:
材料科学
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环境科学
·
化学
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PubMed
高影响因子
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