HYDROMETALLURGY
·
2016
·
IF 2.29
Yue Yang,Boyi Xie,Ruixiang Wang,Shengming Xu,Jianlong Wang,Zhenghe Xu
The utilization of high-phosphorus tungsten ores has attracted extensive attention with the mining and utilization of rich tungsten ores. To extract and separate tungsten from acidic high-phosphorus solution effectively, a novel process was developed. Firstly, tungsten was extracted directly in acid medium by solvent extraction . 99.8% tungsten in acidic high-phosphorus solution was extracted with Aliquat 336 in kerosene by one extraction stage under the conditions of O:A = 1, pH = 2, 25 °C, t = 10 min, 5% v/v 2-Octanol and 10% v/v Aliquat 336. And then, tungsten and phosphorus were preliminary separated through stripping process. Over 95% tungsten were recovered after five stripping stages under the optimum stripping conditions of 2.5 M ammonium bicarbonate , 8 min stripping time, O:A = 1:1, pH = 9, and 60 °C, but only about 1.2% phosphorus was recovered from feed liquor. Finally, a small amount of phosphorus left in strip liquor was deeply removed by magnesium salt precipitation method on the optimum conditions of pH = 10.0, 25 °C, reaction time 1 h and Mg/P molar ratio of 1:2 and the ammonium tungstate solution meeting the requirements of producing high-quality ATP can be obtained successfully. Compared to traditional phosphorus removal route, the process in this paper can help extract tungsten directly in acidic medium and decrease the quantity of phosphorus through extraction-stripping process, significantly reducing the consumption of alkali and magnesium salt and improving the separation efficiency of tungsten from acidic high-phosphorus solution.
研究领域:
冶金化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2025
·
IF 4.7
Lei-ting SHEN,Yu LIU,Juan-lang GUO,Qiu-sheng ZHOU,Tian-gui QI,Zhi-hong PENG,Gui-hua LIU,Xiao-bin LI
The leaching of sulfuric acid converted product of scheelite in NH 3 ·H 2 O−NH 4 HCO 3 solution was systemically studied to improve sulfuric acid conversion−ammonium salts leaching technology route for ammonium paratungstate production. The results showed that the WO 3 leaching efficiency was about 99% under optimal conditions of 350 r/min, liquid-to-solid ratio of 3 mL/g, 1 mol/L NH 4 HCO 3 , 4 mol/L NH 3 ·H 2 O, 25 °C, and 15 min. During the leaching, CaSO 4 almost had no change and was still in a banding or rod-like shape in short leaching time, while conglobate CaCO 3 was gradually formed on the CaSO 4 surface. A secondary reaction might occur between CaSO 4 and WO 4 2− , which could be restrained by a certain amount of CO 3 2− in the solution. There was no CaCO 3 phase determined by XRD in leaching residue of converted product for scheelite concentrate under optimal conditions, which was different from that for synthetic scheelite. The leaching process could be explained by neutralization reaction of H 2 WO 4 and solid transformation of CaSO 4 in NH 3 ·H 2 O−NH 4 HCO 3 solution.
研究领域:
冶金化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Shanshan Li,Binglong Liu,Jiang Li,Xingwen Zhu,Wenbin Liu,Yubai Pan,Jingkun Guo
Yttria (Y 2 O 3 ) nano-powders were synthesized by the normal-strike precipitation method. The influences of R (NH 4 HCO 3 /M 3+ , molar ratio) and ammonium sulfate addition were studied throughout the preparation process. Several analytic techniques such as XRD , TG/DSC, SEM and FTIR were used to determine the characteristics of the precursors and Y 2 O 3 powders. It was found that morphologies and phases of the precursors were evidently influenced by the R value. The phases of the precursors were Y 2 (CO 3 ) 3 ·2.79H 2 O when R was 3–4, while the composition of the precursors with R = 4–5 was (NH 4 ) a Y(OH) b (CO 3 ) c ·xH 2 O. Homogeneous needle-flake shaped particles composed of coadjacent grains with diameters of about 70 nm were obtained as the R = 3–4. The rhombohedral flake-shaped particles were the products with R = 5–6. The mechanism of the influence of R value on the precipitation of the precursor was also investigated in this work. Pure Y 2 O 3 nano-powders were obtained by calcining the precursors at 1000 °C for 4 h regardless of what the R value was. Sulfate ions affect not only dispersion of nanopowders, but also their grain size. Results obtained in this work are contributed to the controllable synthesis of yttria powders.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nanomedicine
·
2017
·
IF 4.727
Ke Kang,Jin Ma,Qiangying Yi,Zhongwei Gu
Aim: To build up a remote triggering drug delivery system with hyperthermia-responsive ammonium bicarbonate salt and investigate its effects on tumor therapy. Materials & methods: This hybrid nanocapsule system was prepared by a different strategy, doxorubicin (DOX) was encapsulated in the heparin shell first and then ammonium bicarbonate was diffused into the nanocapsules to generate DOX-bicarbonate salt, its characterizations and effects on tumor therapy were investigated. Results: Upon exposure to mild external thermal treatment (42°C), DOX-bicarbonate salt began to decompose with the recovery of DOX fluorescence, carbon dioxide generation and rapid DOX release out of the nanocapsules, exhibiting great abilities to accumulate at tumor site rapidly and inhibit tumor cell growth. Conclusion: These hybrid nanocapsules demonstrate great potential in clinical applications triggering by external thermal treatment.
研究领域:
药剂学
·
肿瘤学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2015
·
IF 2.947
Binglong Liu,Jiang Li,Roman Yavetskiy,Maxim Ivanov,Yanping Zeng,Tengfei Xie,Huamin Kou,Shangjun Zhuo,Yubai Pan,Jingkun Guo
Well-dispersed yttria nanopowders were synthesized by a precipitation method from yttrium nitrate solution using ammonium hydrogen carbonate as a precipitant. Needle-like precursor Y 2 (CO 3 ) 3 ·2.79 H 2 O undergoes fragmentation and decomposition into isolated quasi-spherical Y 2 O 3 particles upon calcination in air. Highly transparent YAG ceramics were fabricated from the as-synthesized Y 2 O 3 powder and the commercial α-Al 2 O 3 powder by vacuum sintering. Phase transformation, morphology evolution, and sinterability of Y 2 O 3 powders, microstructure and optical properties of YAG ceramics were investigated in detail. The densification, grain growth, linear shrinkage and phase transformation of the as-sintered ceramics were also explored. The activation energy for grain growth in the ceramic sample is 881 kJ/mol. With optimized preparation conditions, YAG ceramics with the average grain size of about 20 μm were fabricated by sintering at 1780 °C for 20 h, whose in-line transmittance reached 83.7% and 80.3% at the wavelength of 1064 nm and 400 nm, respectively.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2017
·
IF 2.238
Jiawei Dai,Yubai Pan,Haohong Chen,Tengfei Xie,Huamin Kou,Jiang Li
Tb 4 O 7 nanopowders were synthesized by the precipitation method using ammonium hydrogen carbonate (AHC) as the precipitant. The influence of calcination temperature on the properties of Tb 4 O 7 powders was investigated by FTIR, XRD and FESEM. It is found that 1000 °C is the optimum calcination temperature for Tb 4 O 7 powders used for fabrication of Tb 3 Al 5 O 12 (TAG) transparent ceramics, and the average particle size of the 1000 °C-calcined powder is about 150 nm. Using the 800 to 1100 °C-calcined Tb 4 O 7 powders as raw materials, TAG transparent ceramics were fabricated by vacuum sintering at 1700 °C for 20 h. The sample sintered from 1000 °C-calcined Tb 4 O 7 powders shows the best transparency, and its in-line transmittance is above 55% in the 500–1480 nm region, reaching 58.3% at the wavelength of 633 nm. The microstructures and the magneto-optical properties of the TAG ceramics sintered from 800 to 1100 °C-calcined Tb 4 O 7 powders were also studied.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Cunlu Wang,Guangwei Zhang,Han Zhang,Zihao Li,Yeqian Wen
Porous graphitic carbon nitride nanosheets (PMCNS) photocatalyst with a specific surface area of 92.75 m 2 g −1 was prepared by ammonium carbonate guide structure in a one-pot strategy. Compared with bulk graphitic carbon nitride (MCN), the pores in the PMCNS formed by curling and sealing of the lamella provide more active sites, which promote charge separation and transfer, and inhibit the recombination of photoexcited electron and hole pairs. To confirm our strategy, the photocatalytic degradation of rhodamine B (RhB) and hydrogen evolution ability of PMCNS under visible light were performed, and a significant enhancement was observed, the efficiencies are 12.8 and 3.8 times that of MCN, respectively. This work provides an approach for reconstruction of graphitic carbon nitride (g-C 3 N 4 ) structure to improve the photocatalytic oxidation and reduction capabilities under visible light.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2019
·Vol. 2019
·期 1
·5290496
·
IF 2.233
Zhenzhu Yu,Fei Nan,Lu Su,Shaofei Zhang,Yan He
Intercalation and exfoliation are key steps in the preparation of graphene by thermal exfoliation, and they determine the quality of the final product. Therefore, it is important to explore the influence of intercalation agents on the intercalation and exfoliation of graphite. In this article, ammonium bicarbonate is intercalated into graphite with different degrees of oxidation to form a graphite intercalation compound (GIC) by means of ultrasound and stirring. Then, they are exfoliated by being heated at high temperatures. After ammonium bicarbonate intercalation and heating treatment, XRD, TG, and BET show that the intercalation and exfoliation effect of graphite oxide (GO) is better than that of graphite (G) and expanded graphite (EG). The intercalation mechanism is that the ammonia molecule in ammonium bicarbonate solution contains a wedge-shaped structure and active point, which provides empty orbits for graphite electrons and forms edge intercalation through physical interaction at the same time.
研究领域:
材料科学
·
纳米材料
·
物理化学
·
碳材料
·
功能材料
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Xiaozhen Lu,Lin Wang,Hong Peng,Xuewu Zhu,Zhe Yang,Jiashuai Wei,Bin Liu
Polyamide (PA) nanofiltration (NF) membranes represent a promising approach to safe drinking water production. Yet, selective removal of contaminants while retaining essential minerals remains a critical challenge for cost-effective water treatment processes. Here, we employed ammonia bicarbonate (AB) as an economical additive to modify interfacial polymerization (IP) for developing high-performance NF membranes suitable for drinking water applications. Comprehensive characterization coupled with molecular dynamics simulations demonstrate that AB modulates the IP process through three mechanisms: (1) controlling the diffusion kinetics of piperazine (PIP) at the aqueous–organic interface, (2) the reaction between HCO3– and H+ produced by IP achieves nanofoaming, and (3) the thermal decomposition of AB releases additional gaseous products (NH3 and CO2), enhancing the dual nanofoaming effect. This controlled reaction kinetics and increased nanobubble formation produced a thinner, more wrinkled PA selective layer with an optimized microstructure. The optimized NF-AB-8 membrane demonstrated enhanced permeance (28.5 LMH/bar) during actual surface water purification, while maintaining selective separation between minerals and dissolved organic matter (KCa2+/DOM = 34.5). In addition, the improved microstructure and separation performance enhanced the antiscaling and antifouling properties of the NF membrane. This study explored the application of dual-nanofoaming mechanisms in NF membranes, providing insights for designing NF membranes that simultaneously improve permeance and selectivity, which may promote the preparation of high-performance NF membranes and their application in drinking water production.
研究领域:
膜科学
·
水处理技术
·
高分子化学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Green Processing and Synthesis
·
2016
·Vol. 5
·期 4
·389-394
·
IF 1.291
Guilin Chen,Jianmin Li
A green method for the synthesis of indium oxide (In 2 O 3 ) nanoparticles is described in this study. Nanoparticles are formed after simple grind and bake of the mixture of indium nitrate and ammonium bicarbonate. The influences of ratios of reactants and annealing atmosphere on the structure, optical properties and morphology of In 2 O 3 nanoparticles are also investigated. A blue and red shift of optical absorption were observed by using the different ratios of reactants and annealing atmosphere, respectively. This is attributed to the variation of particle size and concentration of oxygen vacancy of In 2 O 3 nanoparticles.
研究领域:
材料科学
·
纳米技术
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Dingshan Liang,Chuanxin Zhong,Feilong Jiang,Junchen Liao,Haixia Ye,Fuzeng Ren
Porous tantalum (Ta) is a potential bone substitute due to its excellent biocompatibility and desirable mechanical properties. In this work, a series of porous Ta materials with interconnected micropores and varying pore sizes from 23 to 210 μm were fabricated using spark plasma sintering. The porous structure was formed by thermal decomposition of ammonium bicarbonate powder premixed in the Ta powder. The pore size and porosity were controlled by the categorized particle size of ammonium bicarbonate. The porous Ta has elastic moduli in the range of 2.1–3.2 GPa and compressive yield strength in the range of 23–34 MPa, which are close to those of human bone. In vitro, as-fabricated porous Ta demonstrates excellent biocompatibility by supporting adhesion and proliferation of preosteoblasts. In vivo studies also validate its bone repair capability after implantation in a rat femur defect model. The study demonstrates a facile strategy to fabricate porous Ta with controllable pore size for bone repair.
研究领域:
材料科学
·
生物医学工程
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2013
·
IF 5.695
Ruichuan Yin,Shengquan Liu,Chao Zhao,Meiling Lu,Moon-shong Tang,Hailin Wang
Acrolein (Acr), a ubiquitous environmental pollutant, can react directly with genomic DNA to form mutagenic adducts without undergoing metabolic activation. To sensitively and accurately quantify Acr–DNA adducts (including structural isomers and stereoisomers) in human leukocytes, we developed an enhanced stable isotope dilution ultrahigh performance liquid chromatography (UHPLC)–tandem mass spectrometry (MS/MS) method using ammonium bicarbonate (NH4HCO3), which is thermally unstable and degrades readily to carbon dioxide and ammonia in heated gas phase. Interestingly, ammonium bicarbonate (as an additive to the mobile phase) not only improves the protonation of AcrdG adducts but also suppresses the formation of MS signal-deteriorating metal–AcrdG complexes during electrospray ionization, leading to the enhancement of their MS detection by 2.3–8.7 times. In contrast, routinely used ammonium salts (ammonium acetate and ammonium formate) and formic acid do not show similar enhancement. The developed method is potentially useful for enhancing ESI-MS detection of other modified 2′-deoxyribonucleosides that have difficulty in protonation and may form excess metal complexes during electrospray ionization. The limits of detection (LODs, S/N = 3) are estimated to be about 40–80 amol. By the use of the developed method, we found that the Acr adducts of three nucleotides (dG, dA, and dC) can be detected in human leukocytes. In addition to the known γ-AcrdG, α-AcrdA is also identified as an Acr-adduct of high abundance (2.5–20 adducts per108 nts).
研究领域:
分析化学
·
环境科学
·
分子生物学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）