JOM
·
2018
·Vol. 70
·期 12
·2837-2845
·
IF 2.145
Zhang Weiguang,Zhang Ting-An,Lv Guozhi,Zhou Weihua,Cao Xuejiao,Zhu Hangyu
The solvent extraction and separation process of Sc(III) and Fe(III) from a strongly acidic and highly concentrated ferric solution using mixtures of di(2-ethylhexyl) phosphate (D2EHPA) and tri-n-butyl phosphate (TBP) in sulfonated kerosene was studied. The effects of various parameters, including D2EHPA concentration, dosage of TBP, and phase ratio, were investigated for the extraction process. The results indicated that the extraction rate of Sc(III) was 99.72% with 1.09% Fe(III) co-extracted after two stages of counter-current extraction under optimal conditions. Moreover, saturation capacity and slope analysis were used to determine the reaction mechanism. Sc(III) is extracted in the form of HSc(SO 4 ) 2 ·4HL. Further separation of Sc(III) and Fe(III) was realized in a scrubbing and stripping process. First, 98.67% of the co-extracted iron in the loaded organic phase was scrubbed with a dilute HCl solution by a three-stage counter-current scrubbing. Then, 85.00% of Sc(III) can be stripped efficiently with a 2-mol/L NaOH solution saturated in 1-mol/L NaCl by three-stage cross-current stripping.
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 7
·期 4
·1463-1470
·
IF 1.938
Yaoyao Jia,Qing Jin,Yan Li,Yuxiu Sun,Jianzhong Huo,Xiaojun Zhao
Metal–organic framework MIL-100(Fe) has high surface area, mesoporous cages, metal active sites and excellent water stability. These fascinating properties endow MIL-100(Fe) with the potential to extract organic dyes from environmental water samples. In the present work, MIL-100(Fe) is synthesized and applied as an adsorbent to remove three different types of dyes from aqueous solution in view of assessing the adsorption isotherms, kinetics and thermodynamics, desorption, and adsorbent regeneration. The adsorption for methylene blue and methyl blue follows a pseudo-second-order kinetics and fits the Freundlich model. The adsorption is a spontaneous process, but is controlled by different thermodynamic parameter changes. Moreover, MIL-100(Fe) could hardly adsorb isatin. Variables influencing the adsorption efficiency, such as adsorption time, temperature, solution pH, adsorbent dosage and salt concentration, are investigated. No remarkable effects of pH and ionic strength are observed for the adsorption of methylene blue and methyl blue on MIL-100(Fe). The used MIL-100(Fe) could be regenerated effectively and recycled without a significant loss of adsorption ability. The adsorption efficiency is about 100% for methylene blue and 52.1% for methyl blue, and the developed method is applied to remove two types of dyes in local water samples.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 6
·2454-2459
·
IF 6.233
Baoru Bian,Weixing Xia,Juan Du,Jian Zhang,J. Ping Liu,Zhaohui Guo,Aru Yan
By using Fe(CO)x-OAm (oleylamine, x < 5) as the Fe precursor to slow down the formation rate of FePt nanoparticles (NPs), a time dependence of the NPs' nucleation and growth process was observed by transmission electron microscopy (TEM). The complexing temperature of OAm and Fe(CO)5 at which Fe(CO)x-OAm was formed has a strong influence on the nucleation rate and growth process of the NPs. TEM analyses indicated that the NPs with isotropic shape were single crystalline throughout the synthesis and were formed by a diffusion-controlled Ostwald-ripening (OR) growth mechanism. The nanorod particles were first formed via joining of arbitrarily oriented single crystals and the two crystals formed a uniform particle afterwards, as described by the oriented-attachment (OA) mechanism. The ratio of OAm to Fe(CO)5 used in the preparation of Fe(CO)x-OAm has a significant influence on the growth process, and subsequently the shape, size and size distribution of the FePt NPs. By adjusting the ratio and its complexing temperature, single-crystal FePt NPs with controllable size and isotropic shape were obtained. The insight into the exploration of the specific roles of the reaction conditions and the formation mechanisms provided important information for controlling the morphology of the nanoparticles.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2012
·
IF 3.285
Wei-Ya Huang,Dan Li,Jun Yang,Zhao-Qing Liu,Yi Zhu,Qi Tao,Kai Xu,Jian-Qiang Li,Yuan-Ming Zhang
Fe(III)-coordinated mesoporous silica adsorbents functionalized with different loadings of ethylenediamine groups were prepared by a new NH 4 F-assisted co-condensation method and impregnation of Fe 3+ cations. Various characterization techniques, e.g. XRD , SEM, TEM, ICP-MS, elemental analysis , FT-IR spectroscopy, and nitrogen adsorption–desorption, were utilized to investigate the effect of functionalization degrees of adsorbents on their chemical composition, surface chemistry, pore structures and phosphate adsorption capacities in detail. In the batch adsorption tests, the functionalized adsorbents with increasing loadings of ethylenediamine groups possessed markedly enhanced adsorption capacities, although there was a gradual loss of ordered mesostructures accompanied. The adsorption isotherms were represented better by using Langmuir model than Freundlich model, which indicated the presence of monolayer adsorption. In particular, for the resulting adsorbent prepared with 0.5:1 M ratio of AAPTS and TEOS, the maximum phosphate capture capacity calculated from Langmuir model is 20.7 mg P/g. In the kinetic study , the phosphate adsorption followed pseudo-second-order equation well with a correlation coefficient of 0.999, suggesting the adsorption process be chemisorption . The phosphate adsorption efficiency of prepared adsorbent was highly pH-dependent and the high removal of phosphate was achieved within the pH between 3.0 and 6.0. The presence of Cl − and NO 3 - exhibited small impacts on the phosphate adsorption by using our synthesized absorbent; whereas, there were significantly negative effects from HCO 3 - and SO 4 2 - on the phosphate removal. In 0.010 M NaOH, more than 90% of the absorbed phosphate anions on the spent adsorbent could be desorbed, suggesting the absorbent with a capacity of regeneration.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2015
·
IF 4.529
Ruowen Liang,Fenfen Jing,Lijuan Shen,Na Qin,Ling Wu
A bifunctional photocatalyst-Fe-benzenedicarboxylate (MIL-53(Fe)) has been synthesized successfully via a facile solvothermal method. The resulting MIL-53(Fe) photocatalyst exhibited an excellent visible light ( λ ≥ 420 nm) photocatalytic activity for the reduction of Cr(VI), the reduction rate have reached about 100% after 40 min of visible light irradiation, which has been more efficient than that of N-doped TiO 2 (85%) under identical experimental conditions. Further experimental results have revealed that the photocatalytic activity of MIL-53(Fe) for the reduction of Cr(VI) can be drastically affected by the pH value of the reaction solution, the hole scavenger and atmosphere. Moreover, MIL-53(Fe) has exhibited considerable photocatalytic activity in the mixed systems (Cr(VI)/dyes). After 6 h of visible light illumination, the reduction ratio of Cr(VI) and the degradation ratio of dyes have been exceed 60% and 80%, respectively. More significantly, the synergistic effect can also be found during the process of photocatalytic treatment of Cr(VI) contained wastewater under the same photocatalytic reaction conditions, which makes it a potential candidate for environmental restoration. Finally, a possible reaction mechanism has also been investigated in detail.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2014
·Vol. 144
·期 6
·1001-1008
·
IF 2.291
Lin Chao,Tao Kai,Hua Dayin,Ma Zhen,Zhou Shenghu
Abstract Bimetallic Au 3 M (M = Ni, Co, Fe) nanoparticles (NPs) were synthesized by reducing a mixture of Au 3+ and metal cations (Ni 2+ , Co 2+ , Fe 3+ ) by butyllithium in the presence of oleylamine. Au 3 M NPs were then deposited onto a commercial SiO 2 support. The Au 3 M/SiO 2 samples were not particularly active in the catalytic reduction of p -nitrophenol unless they were converted into Au–MO
x
/SiO 2 after appropriate thermal treatment in air. The Au–MO
x
/SiO 2 catalysts showed good thermal stability and significantly higher p -nitrophenol conversions than Au/SiO 2 . Relevant characterization was conducted employing X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy, and ultraviolet–visible spectroscopy. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2015
·
IF 2.352
Zhen Huang,Huanqi Jiang,Fang He,Dezhen Chen,Guoqiang Wei,Kun Zhao,Anqing Zheng,Yipeng Feng,Zengli Zhao,Haibin Li
Chemical looping dry reforming (CLDR) is an innovative technology for CO 2 utilization using the chemical looping principle. The CLDR process consists of three stages, i.e. CH 4 reduction, CO 2 reforming, and air oxidation . Spinel nickel ferrite (NiFe 2 O 4 ) was prepared and its multi-cycle performance as an oxygen carrier for CLDR was experimentally investigated. X-ray diffraction (XRD) and Laser Raman spectroscopy showed that a pure spinel crystalline phase (NiFe 2 O 4 ) was obtained by a parallel flow co-precipitating method. NiFe 2 O 4 was reduced into Fe–Ni alloy and wustite (Fe x O) during the CH 4 reduction process. Subsequent oxidation of the reduced oxygen carrier was performed with CO 2 as an oxidant to form an intermediate state: a mixture of spinel Ni 1− x Fe 2+ x O 4 , Fe 2+ y O 4 and metallic Ni. And CO was generated in parallel during this stage. Approximate 185 mL of CO was generated for 1 g spinel NiFe 2 O 4 in a single cycle. The intermediate oxygen carrier was fully oxidized in the air oxidation stage to form a mixture of Ni 1+ x Fe 2− x O 4 and Fe 2 O 3 . Although the original state of oxygen carrier (NiFe 2 O 4 ) was not fully regenerated and agglomeration was observed, a good recyclability was shown in 10 successive redox cycles.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 45
·22708-22715
·
IF 7.443
Chunxiao Lv,Xianfeng Yang,Ahmad Umar,Yanzhi Xia,Yi(Alec) Jia,Lu Shang,Tierui Zhang,Dongjiang Yang
The increasing demand for high performance lithium ion batteries (LIBs) has aroused great interest in developing high specific capacity, cycle performance and rate capability anode materials. Transition metal oxides (TMOs) have attracted much attention as promising anode materials for rechargeable LIBs owing to their high theoretical capacity. Here, a general strategy has been developed to fabricate high-performance fibrous TMO anodes such as elemental Ni doped NiO fibre (NiO/Ni/C-F), yolk–shell structured carbon@Fe2O3 fibre (C@Fe2O3-F), and hollow CuO fibre (CuO-HF) with controllable nanostructures by using alginate microfibres as templates. The key to the formation of various TMO micro-/nano-structures is the templating ability of the natural structure of long alginate molecular chains, where the metal cations can be confined in an “egg-box” via coordination with negatively charged α-L-guluronate blocks. When tested as anode materials for LIB half cells, these fibrous electrodes deliver excellent cycling performance with no capacity decrease after 200 cycles (793 mA h g−1, NiO/Ni/C-F, 0.072 A g−1; 1035 mA h g−1, C@Fe2O3-F, 0.1 A g−1; 670 mA h g−1, CuO-HF, 0.067 A g−1), and demonstrate great rate performance at different current densities. This finding highlights a general, green and eco-friendly strategy for the scale-up production of potential high-performance TMO anodes for LIBs.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2014
·
IF 2.354
Liuchun Zheng,Chenggang Wang,Yuehong Shu,Xiaomin Yan,Laisheng Li
A novel diatomite/chitosan–Fe(III) composite (Fe(III)/Cs@Dia) was synthesized successfully to use as an adsorbent for the removal of anionic azo dye. The composite was further characterized by SEM, FTIR, XPS, and C 13 / Si 29 NMR, and then the adsorption batch experiments were carried out as a function of initial dye concentrations, pH values, contact time and temperatures to determine the adsorption capacities of Fe(III)/Cs@Dia. Compared with several typical isotherm models, the adsorption isotherms were all best-fitted by the Langmuir model, with a maximal 2GL dye uptake of 1250 mg g −1 at pH 6 and 298 K. In addition, kinetic studies followed the pseudo-second-order model and thermodynamic studies revealed that the uptake was exothermic in nature. The adsorption mechanisms were proposed with observation that electrostatic interaction and complexation played the key roles in adsorption process. Moreover, the composite also showed favorable adsorption properties for other four anionic azo dyes (direct yellow R, congo red, methyl orange and direct red 23).
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2017
·Vol. 72
·期 1
·235-250
·
IF 1.258
Duan Mei-Juan,Guan Ze-yu,Ma Yong-Wen,Wan Jin-Quan,Wang Yan,Qu Yan-Fei
In this work, effective and novel heterogeneous catalysts of Metal–organic framework MIL-101(Fe) doped with cobalt (Co 2+ ) or copper (Cu 2+ ) have been synthesized by post-synthesis method, namely Co–MIL-101(Fe) and Cu–MIL-101(Fe). The initial and metal-doped samples were tested to activate persulfate (PS) for removal of Acid Orange 7 (AO7) in water. The surface of samples were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, N 2 adsorption, scanning electron microscopy and transmission electron microscopy. The addition of Cu 2+ and Co 2+ could alter structure characteristics of MIL-101(Fe) in crystal structure and morphology. The unusual octahedron morphology of MIL-101(Fe) turned to be irregular, disorder and a rod-like morphology was shaped. What is more, Co doping caused greater changes in structure characteristics in comparison with Cu doping. The alteration was reflected in the catalytic capacity of PS activation. An interesting note was that, whether Co or Cu doping, metal-doped MIL-101(Fe) greatly improved the PS activation as compared to unmodified MIL-101(Fe). The removal rate of AO7 was about 66, 92, 98% in MIL-101(Fe)/PS, 6%wtCu–MIL-101(Fe)/PS and 6%wtCo–MIL-101(Fe)/PS system, respectively. Some results also suggested the performance of Co–MIL-101(Fe) was superior to that of Cu–MIL-101(Fe). Additionally, a series of parameters were designed to achieve maximum capacity of PS activation. Such an enhancement in activity may be attributed to the main reasons: the new active sites created by metal additives; an increase in number of active Fe sites produced by Co and Cu doping which results in alteration of morphology and structure of catalysts.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Kai Zhang,Wenhai Wang,Long Kuai,Baoyou Geng
High-efficient catalysts for oxygen evolution reaction (OER) are crucial to energy storage and conversion between electricity and chemicals. This work proposes a facile co-reduction and subsequent co-oxidation strategy to gram-scale preparation of composition-controllable LDHs nanosheets by a case study of Ni-Fe LDHs. Different from the traditional coprecipitation method, this process does not need heating and pH control. More importantly, our method can make sure that the Ni-Fe proportion in the LDHs products is well consistent with that in the mother solution. Furthermore, the electrocatalytic OER results strongly demonstrate that the as-prepared Ni-Fe LDHs possess a top-scale activity toward OER in alkaline media, typically for the Ni 6 Fe 4 -LDH nanosheets with water oxidation overpotential as low as 0.24 V at a current density of 20 mA/cm 2 . Besides, it presents excellent stability during the endurance test. Therefore, the co-reduction and subsequent co-oxidation strategy is an highly efficient way to LDHs nanosheets for electrochemical applications.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 15
·15218-15226
·
IF 2.76
Yue Xinxin,Guo Weilin,Li Xianghui,Zhou Haihong,Wang Ruiqin
In this study, a novel core-shell Fe 3 O 4 @MIL-101 (MIL stands for Materials of Institute Lavoisier) composite was successfully synthesized by hydrothermal method and was fully characterized by X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectra, and X-ray photoelectron spectroscopy. The composite was introduced as a catalyst to generate powerful radicals from persulfate for the removal of Acid Orange 7 in an aqueous solution. Effects of the central metal ions of MIL-101, amino group content of MIL-101, and pH were evaluated in batch experiments. It was found that both hydroxyl and sulfate radicals were generated; importantly, sulfate radicals were speculated to serve as the dominant active species in the catalytic oxidation of Acid Orange 7. In addition, a possible mechanism was proposed. This study provides new physical insights for the rational design of advanced metal-organic frameworks (MOF)-based catalysts for improved environmental remediation.
✓ 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）