Journal of Environmental Sciences
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2022
·
IF 6.796
Wenxia Wang,Zhen Li,Kailin Wu,Guodong Dai,Qingping Chen,Lihua Zhou,Junxia Zheng,Liang Ma,Guiying Li,Wanjun Wang,Taicheng An
Rational design and synthesis of highly efficient and robust photocatalysts with positive exciton splitting and interfacial charge transfer for environmental applications is critical. Herein, aiming at overcoming the common shortcomings of traditional photocatalysts such as weak photoresponsivity, rapid combination of photo-generated carriers and unstable structure, a novel Ag-bridged dual Z-scheme g-C 3 N 4 /BiOI/AgI plasmonic heterojunction was successfully synthesized using a facile method. Results showed that Ag-AgI nanoparticles and three-dimensional (3D) BiOI microspheres were decorated highly uniformly on the 3D porous g-C 3 N 4 nanosheet, resulting in a higher specific surface area and abundant active sites. The optimized 3D porous dual Z-scheme g-C 3 N 4 /BiOI/Ag-AgI manifested exceptional photocatalytic degradation efficiency of tetracycline (TC) in water with approximately 91.8% degradation efficiency within 165 min, outperforming majority of the reported g-C 3 N 4 -based photocatalysts. Moreover, g-C 3 N 4 /BiOI/Ag-AgI exhibited good stability in terms of activity and structure. In-depth radical scavenging and electron paramagnetic resonance (EPR) analyses confirmed the relative contributions of various scavengers. Mechanism analysis indicated that the improved photocatalytic performance and stability were ascribed to the highly ordered 3D porous framework, fast electron transfer of dual Z-scheme heterojunction, desirable photocatalytic performance of BiOI/AgI and synergistic effect of Ag plasmas. Therefore, the 3D porous Z-scheme g-C 3 N 4 /BiOI/Ag-AgI heterojunction had a good prospect for applications in water remediation. The current work provides new insight and useful guidance for designing novel structural photocatalysts for environment-related applications.
研究领域:
环境科学
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材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
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2015
·Vol. 17
·期 42
·8113-8118
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IF 4.034
Liao Chen,Tao Ye,Xinyi Jin,Jie Ren,Boning Huang,Zhi-Kang Xu,Hongzheng Chen,Hanying Li
Crystallization in gel media has been occasionally found to result in single crystals with gel networks incorporated inside, extending the gel method with a long history for crystallization into a platform to design the internal composite structures of a crystal. The limited number of gel-incorporated crystals has inspired the investigation on how general gel incorporation is. Crystallization in gels through decomplexation has been widely used to grow crystals with extremely low water solubility, while whether the gel networks are incorporated inside these crystals has not been studied. In this work, crystals of AgCl, AgI and CuCl have been grown in both agarose gels and silica gels by decomplexation. The crystallographic structures of the crystals were identified by powder and/or single X-ray diffraction. The internal hybrid structures were studied by examining the residue materials after gentle etching and complete dissolution of the crystals. When grown from agarose gels containing self-assembled fibrous structures, gel networks were incorporated into single crystals of all the three compounds. In sharp contrast, the gel networks were pushed away when the crystals were grown in silica gels. The discrepancy between the crystals grown from agarose gels and those from silica gels is consistent with the effect of gel strength on gel incorporation. This work may help to harvest gel-incorporated crystals.
研究领域:
晶体学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xiaoyu Xu,Rui Wang,Jun Wang,Zhao Liu,Tingzhi Liu
Z-scheme Ag 3 PO 4 /AgI composites were synthesized by facile in-situ anion-exchange method at room temperature (RT). All the catalysts have excellent affinity to dyes and adsorb larger than 70 % of Methyl blue. The fastest adsorption equilibrium of Ag 3 PO 4 ( q e : 25.9278 mg/g) with low specific surface area (SSA: 4.6624 m 2 /g) can be rapidly attained for 6 min. The best color removal efficiency (RE) for Methyl blue over all the composites can rapidly increase to 100 % within 45 min. Meanwhile, the highest RE for RhB over S3 is 98.9 % for 60 min, and corresponding rate constant ( k ) is 0.07018 min −1 . After adding NaCl or Na 2 CO 3 into sonocatalysis, because of the formation of novel ternary AgCl/Ag 3 PO 4 /AgI and Ag 2 CO 3 /Ag 3 PO 4 /AgI during sonocatalytic process, the best REs for RhB over S3 composite increase from 89.8 % (no scavenger) to 98.2 % (1.2 mM NaCl), or to 97.6 % (1.8 mM Na 2 CO 3 ) for 30 min, respectively, and the REs for Methyl blue over S3 are about 100 % for 10 min. From single Ag 3 PO 4 to binary Ag 3 PO 4 /AgI, and to ternary Ag 2 CO 3 /Ag 3 PO 4 /AgI or AgCl/Ag 3 PO 4 /AgI, REs are significantly enhanced. New redox energy bands and charge transfer channels lead to efficiently spatial charge separation and further activation of hole ( h + ), superoxide anions (·O 2 − ), hydroxyl radicals (·OH). Additionally, the relation among oxygen vacancies (O v ), Zeta potential and RE was discussed in detail. Density functional theory (DFT) calculations were used to make clear charge transfer and sonocatalytic mechanism. The evaluation of used samples, adsorption kinetics and modes, diverse degradation pathways and sonocatalytic mechanisms were also discussed in detail. The work provides a novel in-situ strategy for real-time control of catalytic performance by rapidly forming new phase during catalysis at RT. Furthermore, the strategy obviously facilitates real-time development of rare more than ternary composites for enhanced catalytic performance.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2023
·
IF 3.5
Xiyang He,Meng Yan,Wencai Cheng,Congcong Ding,Dujiang Liu,Xiaoyi Cui,Xiaoyan Shu,Yi Liu,Xiaoan Li,Du Liu,Xirui Lu
Developing an effective method to immobilize iodine waste has always been our ultimate goal. In this research, we use two methods (A: raw materials (B 2 O 3 , Bi 2 O 3 , ZnO, SiO 2 ) directly mixed with iodine waste to generate composite materials, B: raw materials are firstly synthesized into glass powders, then we mixed the glass powders with the iodine waste to generate composite materials) to immobilize iodine waste. There were about six phases in method A while only AgI peak appeared in method B. And SEM-EDS results for method A and B indicated that AgI existed in both encapsulated and dispersed distribution form and the XPS indicated the same chemical valence state and chemical environment. The variation of [BO 3 ], [BO 4 ] and [SiO 4 ] in FT-IR illustrated that the structure of the composite materials were mainly boron glass network and silica glass network for method A and B, respectively. The rest of iodine content for method A and B were 97.7% and 92.7% compared to the original sample. And the iodine leaching rate were 10 −7 and 10 −6 respectively. Comparing the values of the rest of iodine content and leaching rate, we consider the method A could be a potential method to treat iodine waste.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Wenbo Sun,Peiling Gao,Jiutao An,Jianan Li,Xinyong Li
Hydrogen sulfide (H 2 S), as both an endogenously gaseous signaling compound and an environmentally hazardous substance, has shown great relevance to human health and ecosystem safety. However, a reliable sensing platform for the facile detection of trace H 2 S is still a challenge to be addressed. Herein, a AgI-TiO 2 nanorods array electrode was fabricated through a hydrothermal method followed by ultrasonic impregnation treatment to construct an ultrasensitive photoelectrochemical H 2 S sensor. The decorated AgI could not only play a significant role in the enhancement of visible light absorbance as a narrow bandgap sensitizer but also contribute to the specific affinity towards sulfide as the recognition unit. In the presence of sulfide, multiple heterojunctions were established in situ due to I − -to-S 2− exchange at the AgI sites, proportionately increasing the photocurrent response of the functionalized PEC electrodes. The designed photoelectrochemical (PEC) sensing platform could achieve the quantitative determination of sulfide in a wide range of 1 ∼ 1000 nM with an effective detection limit of 1.25 nM. Additionally, the detection performances for practical H 2 S-containing waste gas and the biological environment were also evaluated. This work could broaden a new vision of the delicate design of interfaces for ultrasensitive environmental analysis.
研究领域:
环境科学
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分析化学
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生物医学工程
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 6
·4065-4071
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IF 1.354
Cui Duo Heng,Zheng Yi Fan,Liang Lin Guo,Song Xu Chun
Herein, a novel visible-light-driven heterojunction AgI/WO3 nanocomposite was successfully prepared using a facile two-step hydrothermal–precipitation process and applied for photodegradation of organic pollutants. The information of phase structures, morphology, optical
properties of the asprepared samples was analysed in detail by XRD, TEM, EDS, STEM, DRS measurement and so on. Formation of the heterostructure and intimate interactions between AgI and WO3 can promote highly effective photogenerated electron–hole pairs separation, which enable
the heterojuctions to perform excellent photocatalytic activity as greatly enhanced photocatalysts compared to that of pristine AgI and WO3 for decomposing Rhodamine B (RhB) dye under visible light irradiation. In addition, the AgI/WO3 (1:1) nanocomposites exhibit optimal
photocatalytic activity. Moreover, the as-prepared samples exhibit good stability, which is favorable for its potential application. Additionally, we have an analysis on a possible photocatalytic mechanism based on trapping experiments together with other experimental results.
研究领域:
材料科学
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光催化
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纳米技术
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环境化学
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DOI
高影响因子
SUPERLATTICES AND MICROSTRUCTURES
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2014
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IF 1.979
Bingang Chen,Yongyong Deng,Hanxuan Tong,Jianhua Ma
In this study, a series of AgI/Bi 2 WO 6 heterojunction photocatalysts were synthesized with deposition–precipitation method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), UV–vis diffuse reflectance spectroscopy (DRS). The photocatalysts exhibited enhanced photocatalytic activity on the RhB dye degradation under visible-light irradiation. The 58.5% AgI/Bi 2 WO 6 sample was observed to have the highest photocatalytic degradation efficiency. Based on the calculated energy band positions, the mechanism of enhanced photocatalytic activity was discussed.
研究领域:
材料科学
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光催化
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环境化学
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纳米材料
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半导体物理
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DOI
高影响因子
JACS Au
·
2026
·
IF 8.5
Pengfei Han,Eric R. Waclawik,Steven E. Bottle,Qi Xiao,Xuheng Yang,Cheng-an Tao,Jianfang Wang,Huai Yong Zhu
Developing clean and efficient methods for carbon–carbon bond formation remains a central challenge in sustainable chemistry. Here, we report a unified photocatalytic strategy for direct arene arylation and alkylation under visible light. By integrating silver iodide (AgI) nanoparticles with magnesium–aluminum-layered double hydroxide (Mg2Al1-LDH), we achieve efficient cross-coupling of arenes with both aryl and unactivated alkyl iodides under mild conditions and natural sunlight. This system operates without external bases or photoredox cocatalysts and tolerates base-sensitive functional groups, producing only water and iodine as byproducts. Mechanistic studies reveal a synergistic process in which photogenerated electrons reduce halides via an inner-sphere transfer mechanism, while photogenerated holes oxidize surface hydroxyl groups to generate ·OH radicals. These radicals enable hydrogen abstraction and C–H bond activation, completing the coupling process. The availability of surface hydroxyls and oxygen vacancies, along with favorable band alignment between AgI and Mg2Al1-LDH, is critical to catalyst performance. This work demonstrates the first example of a single catalyst system enabling both arylation and alkylation through a unified radical mechanism, offering a sustainable platform for light-driven C–H functionalization and expanding the frontiers of green synthetic chemistry.
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DOI
PubMed
高影响因子
JOURNAL OF NUCLEAR MATERIALS
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2020
·
IF 2.485
Guilin Wei,Xiaoyan Shu,Zhentao Zhang,Fen Luo,Yi Liu,Bingsheng Li,Yi Xie,Lan Wang,Xirui Lu
The treatment of radioactive iodine waste is particularly difficult because of its volatilization issues. In this study, amorphous silica gel was used to gradually replace crystalline SiO 2 in B 2 O 3 -Bi 2 O 3 -ZnO-SiO 2 based materials aimed to investigate the effects on iodine waste immobilization. Samples with different silica gel replacements (0, 20, 40, 60, 80, and 100%) were characterized by XRD, FT-IR, and SEM-EDS. The results showed that silica gel had a benefit in the immobilization of iodine waste at low-sintering temperatures (500, 550, and 600 °C). At 550 °C, AgI was immobilized in the pure glassy matrix and elements (Ag and I) distributed uniformly on the matrix surface. FT-IR analysis presented the tetrahedral SiO 4 units in the sintered samples that were mainly in the form of sheets. Our work revealed the potential application of silica gel in the field of iodine waste immobilization.
研究领域:
核废料管理
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·Vol. 61
·期 33
·24477-24493
·
IF 4.4
Dong Mingming,Yang Shuyong,Zhou Peng,Huang Zewen,Tu Shenghui
The persistence and removal of antibiotic residues in aquatic environments represent a global environmental challenge. In this study, a novel ternary Bi 2 WO 6 /UiO-66/AgI heterojunction photocatalyst was designed and constructed for the deep removal of tetracycline (TC). AgI nanoparticles and Bi 2 WO 6 nanosheets were in situ anchored onto a porous UiO-66 framework, successfully integrating high adsorption capacity, visible-light response, and efficient charge separation. It was demonstrated that the composite, when exposed to visible light, exhibited a significantly enhanced level of TC degradation activity in comparison with its single- and binary-component counterparts. Mechanistic investigations revealed that UiO-66 not only served as an adsorptive substrate to concentrate pollutants but also functioned as an electron transfer mediator, promoting a direct Z-scheme charge transfer pathway between Bi 2 WO 6 and AgI. This configuration effectively suppressed charge-carrier recombination and enhanced the generation of reactive oxygen species ·O 2 − , ·OH and h + ). The proposed reaction pathway was confirmed by radical-trapping experiments and electron paramagnetic resonance (EPR) spectroscopy. Additionally, this composite material demonstrated favourable performance in stability and toxicity assessments. This work provides a new design concept for metal–organic framework-based composite photocatalysts and elucidates their potential application in synergistic adsorption–photocatalytic degradation of organic pollutants in water treatment. Graphical abstract
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DOI
高影响因子
PHYSICAL REVIEW B
·
2023
·Vol. 107
·期 6
·064308
·
IF 3.7
Yan Wang,Quan Gan,Mingyuan Hu,Jinhong Li,Lin Xie,Jiaqing He
Ionic conductors such as AgI with ultralow thermal conductivities $({\ensuremath{\kappa}}_{l})$ are of increasing interest because of their excellent thermoelectric properties. However, the origin of their intrinsic low ${\ensuremath{\kappa}}_{l}$ values remain elusive. In this study, comprehensive theoretical calculations of the lattice dynamics and the thermal transport properties of $\ensuremath{\gamma}\text{\ensuremath{-}}\mathrm{AgI}$ (zinc-blende structure) and $\ensuremath{\beta}\text{\ensuremath{-}}\mathrm{AgI}$ (wurtzite structure) as functions of temperature were carried out based on many-body perturbation theory and phonon Boltzmann transport theory. First, the mean-squared displacements (MSDs) of ${\mathrm{Ag}}^{+}$ were significantly larger than those of ${\mathrm{I}}^{\ensuremath{-}}$ in both $\ensuremath{\gamma}\text{\ensuremath{-}}$ and \ensuremath{\beta}-phases below the order-disorder phase transition temperature $({T}_{\mathrm{c}})$, which led to a characteristic ``rattling'' feature and low-frequency, nearly flat local phonon vibrations. According to our previous work [Xie et al., Phys. Rev. Lett. 125, 245901 (2020)], such nondispersive flat phonon band structures are expected to give rise to four-phonon resonance and result in a dramatic increase in the four-phonon scattering over the conventional three-phonon scattering. For $\ensuremath{\gamma}\text{\ensuremath{-}}\mathrm{AgI}$, similar four-phonon resonance behavior was also discovered for the low-lying transverse acoustic phonon branches, and it was found that their four-phonon scattering rates were an order of magnitude larger than the corresponding three-phonon scattering rates. Considering the four-phonon scattering, the theoretical ${\ensuremath{\kappa}}_{l}$ of $\ensuremath{\gamma}\text{\ensuremath{-}}\mathrm{AgI}$ was predicted to be $\ensuremath{\sim}0.32$ W/m K at 300 K, which was in good agreement with the value deduced from our experiments ($\ensuremath{\sim}0.36$ W/m K at 300 K). Compared to $\ensuremath{\gamma}\text{\ensuremath{-}}\mathrm{AgI}$, the acoustic phonons in $\ensuremath{\beta}\text{\ensuremath{-}}\mathrm{AgI}$ were more dispersive, and they intertwined with low-energy optical phonons at the zone boundaries. It was found that three-phonon resonance became as important as four-phonon resonance for the nearly flat longitudinal phonon band. The theoretical ${\ensuremath{\kappa}}_{l}$ for $\ensuremath{\beta}\text{\ensuremath{-}}\mathrm{AgI}$ was determined to be around $\ensuremath{\sim}0.32$ W/m K at room temperature, closely reproducing our measurement value $\ensuremath{\sim}0.29$ W/m K. Our results for AgI demonstrate the strong quartic anharmonicity in materials characterized by the rattling of weak bonding atoms as well as dispersionless phonon band structures. It is believed that this intimate relationship between the low-${\ensuremath{\kappa}}_{l}$ and flat phonon dispersion can be employed as a good indicator when searching for material systems with ultralow ${\ensuremath{\kappa}}_{l}$ values, e.g., cagelike rattling structures, quasi-two-dimensional structures, and chainlike structures.
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Yaxin Feng,Guilin Wei,Yi Liu,Wenhong Han,Yan Chen,Runjie Sun,Lin Peng,Meihua Ma,Yu Zhang,Zhentao Zhang,Xirui Lu
The immobilization of iodine waste is a challenge in the field of nuclear waste . In this work, iodine waste (silver-coated silica gel with different iodine loadings) was immobilized at low-sintering temperatures (500, 550, and 600 °C). XRD represented that the crystallized phases of the sintered matrix consist of AgI and B 2 O 3 . The crystallization behavior of boron can be found as the sintering temperature increased from 500 °C to 600 °C. FT-IR results proved that in the process of crystallization, part of the microstructure related to B–O stretching transformed from [BO 4 ] to [BO 3 ] units, which benefits low-temperature iodine waste immobilization due to the bonding energy of [BO 3 ] is higher than that of [BO 4 ]. Our work reveals the B-related microstructure transition in low-temperature immobilization iodine waste.
研究领域:
核废物处理
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材料科学
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无机化学
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放射化学
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环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）