ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Long Liu,Wei Liu,Xiaoliang Zhao,Daimei Chen,Rongsheng Cai,Weiyou Yang,Sridhar Komarneni,Dongjiang Yang
Radioactive iodine isotopes that are produced in nuclear power plants and used in medical research institutes could be a serious threat to the health of many people if accidentally released to the environment because the thyroid gland can absorb and concentrate them from a liquid. For this reason, uptake of iodide anions was investigated on microrosette-like δ-Bi2O3 (MR-δ-Bi2O3). The MR-δ-Bi2O3 adsorbent showed a very high uptake capacity of 1.44 mmol g–1 by forming insoluble Bi4I2O5 phase. The MR-δ-Bi2O3 also displayed fast uptake kinetics and could be easily separated from a liquid after use because of its novel morphology. In addition, the adsorbent showed excellent selectivity for I– anions in the presence of large concentrations of competitive anions such as Cl– and CO32–, and could work in a wide pH range of 4–11. This study led to a new and highly efficient Bi-based adsorbent for iodide capture from solutions.
研究领域:
环境科学
·
材料科学
·
核医学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Luyi Chen,Jinrui Xu,Hengfeng Qian,Boshuang Zhang,Yu Fu,Jianmao Yang,Jianyun Liu
Excessive phosphate concentration in waterbody will lead to eutrophication and deterioration of water quality. Capacitive deionization (CDI) is an environmental-friendly technique for ion removal, and the phosphate ions can be selectively removed and accumulated by designing the CDI electrode materials with specific phosphate bonding capability. Herein, a δ-Bi 2 O 3 -modified porous carbon nanofiber (δ-Bi 2 O 3 @PCNF) was constructed by solvothermal reaction in the presence of polyhydric alcohols. Due to abundant oxygen vacancies and high flexibility, the δ-Bi 2 O 3 @PCNF was used directly as a self-supporting CDI anode for selective phosphate adsorption. Under the optimized conditions, the adsorption capacity of phosphate arrived at 99.6 mg P/g in 50 mg P/L solution, and the adsorption maximum of 127.5 mg P/g was achieved according to Langmuir adsorption model. In the dual-anion solution containing PO 4 3 – and Cl – , the δ-Bi 2 O 3 @PCNF electrode still maintains the high selectivity, with a P separation factor of 22 (C PO 4 3 – /C Cl – = 1:5, molar ratio) in PO 4 3 – /Cl – mixture. By using the δ-Bi 2 O 3 @PCNF-based CDI device, the actual paddy drainage has realized the ultralow phosphate concentration down to 0.03 mg P/L. The related mechanisms involved in phosphate adsorption on δ-Bi 2 O 3 @PCNF were proposed. This work demonstrates the great potential of CDI technology for low-concentration phosphorus recovery, owing to the high selectivity of the δ-Bi 2 O 3 @PCNF electrode material.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Long Liu,Ning Chen,Yong Lei,Xuyan Xue,Lina Li,Jiancheng Wang,Sridhar Komarneni,Huaiyong Zhu,Dongjiang Yang
Removal of the toxic selenium compounds, selenite (SeO 3 2− ) and selenate (SeO 4 2− ), from contaminated water is imperative for environmental protection in both developing and industrialized countries. Providing high selectivity adsorbents to the target ions is a big challenge. Here we report that micro sphere-like δ-Bi 2 O 3 (MS-δ-Bi 2 O 3 ) with surface oxygen vacancy defects can capture hypertoxic SeO x 2− anions from aqueous solutions with superior capacity and fast uptake rate. High capture selectivity to SeO 3 2− anions is observed, since the O atoms of SeO 3 2− anions fill the oxygen vacancies on the (111) facet of δ-Bi 2 O 3 forming a stable complex structure. This mechanism is distinctly different from other known mechanisms for anion removal, and implies that we may utilize surface defects as highly efficient and selective sites to capture specific toxic species. Thus, we present a new route here to design superior adsorbents for toxic ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2011
·Vol. 13
·期 17
·5460-5466
·
IF 4.006
Manying Liu,Lizhi Zhang,Kewei Wang,Zhi Zheng
The Kirkendall effect has gained intense attention and wide acceptance in nanoscience and nanotechnology because it can result in porosity or deformation in the case of the alloying or oxidation of metals. In this work, we report a facile approach to prepare δ-Bi2O3 solid spheres and further convert them to hierarchical BiOI nests for the first time through a solvothermal reaction at low temperature. The δ-Bi2O3 and BiOI samples obtained were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The formation mechanism has been proposed by emphasizing the Kirkendall effect. We also found that the template of δ-Bi2O3 solid spheres was initially formed by surfactant oleylamine induction. Anion exchange has been confirmed to occur in the reaction involving the Kirkendall effect.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Man Tian,Hujun Cao,Laijun Liu,Jungu Xu
In this work, a series of multiple lanthanide and tungsten co-doped fluorite structured (Bi 2 O 3 ) 0.95- x (Ho 0.4 Er 0.4 Tm 0.4 Yb 0.4 Lu 0.4 O 3 ) x (WO 3 ) 0.05 ( x = 0.1, 0.2, 0.3, 0.4) and (Bi 2 O 3 ) 0.26 (Ho 0.5 Er 0.5 Tm 0.5 Yb 0.5 O 3 ) 0.48 (WO 3 ) 0.26 materials were prepared by traditional solid-state reaction method. The phases, stabilities, and electrical properties of these materials were thoroughly studied. The results revealed that under high oxygen partial pressure, CO 2 , or inert atmospheres, all these samples had excellent long term thermal stability and chemical stability, and the samples of (Bi 2 O 3 ) 0.95- x (Ho 0.4 Er 0.4 Tm 0.4 Yb 0.4 Lu 0.4 O 3 ) x (WO 3 ) 0.05 ( x = 0.1, 0.2, 0.3, 0.4) with low or mediate configuration entropies showed pure and high oxide ion conductivities, e.g. ∼2.6 × 10 −2 S/cm at 600 °C for the sample x = 0.2. Whereas, for the (Bi 2 O 3 ) 0.26 (Ho 0.5 Er 0.5 Tm 0.5 Yb 0.5 O 3 ) 0.48 (WO 3 ) 0.26 sample with high configuration entropy, pure ionic conduction occurred only within a narrow temperature range (700−750 °C) under the N 2 atmosphere. Under strong reducing condition, only the high-entropy sample (Bi 2 O 3 ) 0.26 (Ho 0.5 Er 0.5 Tm 0.5 Yb 0.5 O 3 ) 0.48 (WO 3 ) 0.26 showed high phase and chemical stabilities, but would introduce strong electronic conduction rise from the reduction of the high content W 6+ . While for (Bi 2 O 3 ) 0.95- x (Ho 0.4 Er 0.4 Tm 0.4 Yb 0.4 Lu 0.4 O 3 ) x (WO 3 ) 0.05 with low or mediate configuration, phase decompositions with impurities of Bi metal and HoH 2 were observed under strong reducing atmosphere, accompany with obviously decreased conductivities. Therefore, we provided here a comprehensive understanding for the multiple components doped Bi 2 O 3 -based materials with configuration entropy from low to high on their phases, stabilities, and electrical properties, and suggested a new strategy for designing and stabilizing bismuth-oxide-based materials.
研究领域:
材料科学
·
固体化学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Tingting Qin,Xiaoyu Zhang,Dong Wang,Ting Deng,Haoxiang Wang,Xiaofei Liu,Xiaoyuan Shi,Zhengming Li,Hong Chen,Xiangmin Meng,Wei Zhang,Weitao Zheng
Metal oxides as electrode materials are of great potential for rechargeable aqueous batteries. However, they suffer from inferior cycle stability and rate capability because of poor electronic and ionic conductivities. Herein, taking vertically orientated Bi2O3 nanoflakes on Ti substrates as examples, we find that the δ-Bi2O3 electrode with plenty of positively charged oxygen defects show remarkably higher specific capacity (264 mA h g–1) and far superior rate capability than that of α-Bi2O3 with less oxygen vacancies. Through pinpointing the existence form and the role of oxygen vacancies within the electrochemical processes, we demonstrate that oxygen vacancies in δ-Bi2O3 can not only promote electrical conductivity but also serve as central entrepots collecting OH– groups via electrostatic force effect, which has boosted the oxidation reaction and enhanced the electrochemical properties. Our work merits an excellent Bi2O3 negative electrode material via giving full play to the role of oxygen vacancies in electrochemical energy storage.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Shuang Qi,Lei Dai,Weiwei Meng,Yuehua Li,Ling Wang
Bi 2 O 3 modified La 0.75 Sr 0.25 Cr 0.5 Fe 0.5 O 3-δ (LSCF) composites have been successfully prepared by self-demixing and used as the sensing electrode (SE) of an amperometric NO 2 sensor with yttria stabilized-zirconia (YSZ) electrolyte. The Bi 2 O 3 modified LSCF composites were formed from precursor La 0.75 Sr 0.25 Bi x Cr 0.5 Fe 0.5 O 3+δ (x = 0, 5%, 10%, 20%, 30% and 40%) after calcining at 1200 °C. The particle size of LSCF was increased with the Bi 2 O 3 content increasing. The YSZ porous framework structures were fabricated on YSZ to prolong TPB and the LSCF-xBi 2 O 3 -SE with porous structure was prepared on the porous YSZ backbone after calcining at 1000 °C. It is found that the sensors attached with LSCF-xBi 2 O 3 -SE are more sensitive to different concentrations of NO 2 (25–300 ppm) than the LSCF-based sensor. Among them, LSCF-20% Bi 2 O 3 based sensor exhibits the highest sensitivity (0.301 μA /ppm at 550 °C). The relationship between Δ I s and NO 2 concentrations of the sensor varies linearly at a given temperature. Meanwhile, the sensor shows well anti-interference capability for co-existent gases.
研究领域:
材料科学
·
电化学
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2026
·
IF 18.1
Wu Qianmin,Li Cui,Wu Yuxuan,Liang Qing,Lv Xuyu,Li Yanhong,Wang Chang,Wu Mengjie,Kong Lichun,Lu Ji-Qing,Zhang Wei,Li Zhengquan,Chen De-Li,Zhou Jing,Yang Fa
Stabilizing metal oxides is a prerequisite for elucidating their intrinsic mechanistic roles and sustaining high electrocatalytic activity. Here, we synthesize a high-temperature-phase La 2 O 3 -socketed sub-2 nm δ-Bi 2 O 3 heterojunction (δ-Bi 2 O 3 /La 2 O 3 ) that suppresses Bi 3+ reduction to metallic Bi, achieving ≥95% formate Faradaic efficiency for ~200 hours in industrial-level electrolyzers. Electronic structure analyses reveal that strong electrostatic interactions between δ-Bi 2 O 3 and La 2 O 3 drive oxygen migration to the interface, contracting δ-Bi 2 O 3 domains and enhancing La–Bi d-p orbital hybridization. This structural relaxation stabilizes interfacial Bi–O–La linkages and electron-deficient Bi 2 O 3+x species under cathodic potentials, as confirmed by in situ X-ray absorption spectroscopy. Pourbaix diagrams and in situ infrared spectroscopy demonstrate that La 2 O 3 promotes water dissociation to form a hydroxylated δ-Bi 2 O 3 surface under working potentials, enhancing protonation propensity. Consequently, the energy barrier for the rate-determining step (*CO 2 → *HCOO) is lowered to +0.15 eV on δ-Bi 2 O 3 /La 2 O 3 , significantly lower than the +0.83 eV barrier on pristine δ-Bi 2 O 3 . This work establishes a sub-nanoscale oxide/oxide heterojunction strategy to stabilize high-valent metal sites, enabling sustainable electrochemical conversion.
✓ 已验证
DOI
PubMed
高影响因子
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