DALTON TRANSACTIONS
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2016
·Vol. 45
·期 16
·7124-7130
·
IF 4.177
Li-Jun Zhang,Yan-Yan Li,Peng-Fei Liu,Ling Chen
New borophosphates Li3Cs2M2B3P6O24 (M = Pb, Sr) have been synthesized by high-temperature solid-state reactions. The single-crystal X-ray diffraction data reveal their non-centrosymmetric cubic space group P213 and lattice parameters of a = 12.7246(3) Å and 12.687(2) Å and V = 2060.31(8) Å3 and 2042.3(4) Å3 for Li3Cs2Pb2B3P6O24 and Li3Cs2Sr2B3P6O24, respectively. They are three-dimensional (3D) [BP2O8]3−∞ anionic frameworks formed by a new double six-membered ring building unit consisting of BO4 and PO4 units joined alternately. Interestingly, such a double six-membered ring is regarded as the structural variation of the 12-membered ring in the known KSrBP2O8, fusing at the BO4 tetrahedron induced by the coexistence of the Li+ and Cs+ cations with their large size difference. The title compounds show weak SHG intensity and exhibit photoluminescence emissions at 410 nm for Li3Cs2Pb2B3P6O24 and 440 nm for Li3Cs2Sr2B3P6O24.
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RSC Advances
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2016
·Vol. 6
·期 90
·86829-86835
·
IF 3.289
Ling Chang,Shuquan Chang,Wei Han,Wei Chen,Zheng Li,Zheng Zhang,Yaodong Dai,Da Chen
Novel porous permutite/carbon nanobeads/amidated alginic acid nanocomposites were successfully fabricated via a gamma radiation method. The carbon nanobeads are 40–60 nm in diameter. The cross-linked amidated alginic acid is well dispersed on the surface of carbon nanobeads and permutite. The preparation parameters such as reactant ratio, carbonization conditions and radiation dose were optimized. The influences of contact time, pH and initial concentration of the Cs+ solution were investigated. Contact time = 4 h and pH = 9 are ideal conditions for Cs+ removal. The Cs+ removal efficiency and adsorption capacity can reach 98% and 60.1 mg g−1 respectively. They have good stability and adsorption–desorption properties. The adsorption capacity can maintain more than 85% after 4 adsorption–desorption cycles. The preparation strategy and adsorption mechanism were also discussed. Gamma radiation technology exhibits distinguished advantages to improve the dispersion and stability of organic/inorganic hybrid materials. This method can be easily applied to prepare other similar porous hybrid adsorbents.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2014
·
IF 2.423
Pan Liang,Qiu-Yue Kang,Lu Du,Zhi-Hong Liu
Two pure microporous materials, Rb[ZnBP 2 O 8 ] and Cs[ZnBP 2 O 8 ], have been synthesized and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of Rb[ZnBP 2 O 8 ] and Cs[ZnBP 2 O 8 ] (s) in 3 mol · dm −3 HCl (aq), of Zn(PO 3 ) 2 (s) in (HCl + H 3 BO 3 ) (aq), and of RbCl (s)/CsCl (s) in [Zn(PO 3 ) 2 + HCl + H 3 BO 3 ] (aq) were measured by microcalorimeter at T = 298.15 K, respectively. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 3 mol · dm −3 HCl (aq), together with the use of the standard molar enthalpies of formation for Zn(PO 3 ) 2 (s), RbCl (s)/CsCl (s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of −(3198.5 ± 1.2) kJ · mol −1 for Rb[ZnBP 2 O 8 ] and −(3212.7 ± 1.2) kJ · mol −1 for Cs[ZnBP 2 O 8 ] at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycle. In addition, the molar enthalpy of formation of −(2944.4 ± 1.2) kJ · mol −1 for [ZnBP 2 O 8 ] − has also been estimated by a group contribution method, which can be used to predict the Δ f H m θ of the other similar borophosphates. Moreover, these data have been further used to compare the thermodynamic stability of this series of borophosphates.
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CATALYSIS TODAY
·
2015
·
IF 3.893
Chunyu Chen,Xiong Wang,Jian Zhang,Chaoqun Bian,Shuxiang Pan,Fang Chen,Xiangju Meng,Xiaoming Zheng,Xionghou Gao,Feng-Shou Xiao
Catalytic combustion over zeolite supported platinum catalysts is regarded as one of the efficient methods for removal of volatile organic compounds (VOCs). In this work, we show a preparation of Pt loaded mesoporous ZSM-5 zeolite (Pt/Meso-ZSM-5) with various cations. The sample N 2 sorption isotherms and TEM image show abundant mesoporosity existing in the zeolite crystals. The catalytic toluene combustion tests show that the Pt/Meso-ZSM-5 catalysts have higher activities than conventional ZSM-5 supported Pt catalysts (Pt/ZSM-5), which is related to their difference in the concentration of active sites Pt 0 and the rate of mass transfer. Particularly, after reduction with hydrogen at 300 °C, the Pt nanoparticles supported on Meso-ZSM-5 with K + and Cs + cations (Pt-R/Meso-KZSM-5 and Pt-R/Meso-CsZSM-5) exhibit much higher activities than those on Meso-ZSM-5 with Na + and H + cations, which is well consistent with their order of the Pt 0 concentration. For example, Pt-R/Meso-KZSM-5 gives the temperature for conversion of 98% toluene ( T 98 ) at only 175 °C, while Pt-R/Meso-HZSM-5 shows the T 98 at 190 °C. More importantly, Pt-R/Meso-KZSM-5 has a long life, and its activity cannot be influenced by the water and CO 2 . These features are critically important for practical applications of these catalysts in the future.
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CATALYSIS LETTERS
·
2014
·Vol. 144
·期 11
·1851-1859
·
IF 2.291
Chen Chunyu,Wang Xiong,Zhang Jian,Pan Shuxiang,Bian Chaoqun,Wang Liang,Chen Fang,Meng Xiangju,Zheng Xiaoming,Gao Xionghou,Xiao Feng-Shou
Abstract A series of ZSM-5 zeolite with various cations (H + , Na + , K + , and Cs + ) and Si/Al ratios (60, 100, 300, and ∞) supported 0.5 % Pt have been prepared and tested in the combustion of toluene. It is found that Pt/KZSM-5-100 catalyst exhibits excellently high catalytic activity, negligible inhibition effect of H 2 O, and long catalyst life. Graphical Abstract 0.5 %Pt/KZSM-5-100 catalyst exhibits superior performance in combustion of VOCs, which would be potentially important for environmental protection.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Hang Long,Pingxiao Wu,Lin Yang,Zhujian Huang,Nengwu Zhu,Zhixian Hu
Ethylamine modified vermiculite (Ethyl-VER) with high specific surface area and excellent pore structure was prepared to remove cesium from aqueous solution. The physic-chemical properties of the pristine and modified vermiculite were analyzed by X-ray diffraction (XRD), Fourier-transform infrared (FTIR), specific surface area (BET) and scanning electron microscopy/energy disperse spectroscopy (SEM/EDS). The corroding effect of ethylamine increased the specific surface area of vermiculite from 4.35 to 15.59 m 2 g −1 , and the average pore diameter decreased from 6.8 to 5.34 nm. Batch adsorption experiments were conducted as a function of pH, initial Cs + concentration, contact time, coexisting cations (K + , Na + , Ca 2+ ) and low-molecular-weight organic acids (acetic acid, oxalic acid, citric acid) to illustrate the adsorption behavior. The study found that the adsorption capacity of cesium in aqueous solution was improved from 56.92 to 78.17 mg g −1 after modification. The formation of micropores and mesopores and the increased surface area played a critical role in the enhancement of cesium adsorption. Kinetic experiments indicated that the adsorption process can be simulated well with a pseudo-second-order model. The presence of cations or low-molecular-weight organic acids inhibited cesium adsorption in different degrees. On the basis of our results, Ethyl-VER with good surface characteristics and high adsorption capacity is a suitable adsorbent for cesium removal from aqueous solution.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Ning Li,Yan-Ling Xing,Zhi-Hong Liu
Two pure mixed alkali metal borates with Non-Linear Optical (NLO) properties, Li 6 Rb 5 B 11 O 22 and Li 4 Cs 3 B 7 O 14 , have been synthesized by a high-temperature solid state reaction, and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of Li 6 Rb 5 B 11 O 22 and Li 4 Cs 3 B 7 O 14 in 1 mol · dm −3 HCl (aq), and of LiCl·H 2 O(s) in (1 mol · dm −3 HCl + H 3 BO 3 + RbCl/CsCl) (aq) have been determined by microcalorimeter at T = 298.15 K, respectively. From these data and with the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol · dm −3 HCl (aq), together with the use of the standard molar enthalpies of formation for LiCl·H 2 O(s), RbCl(s)/CsCl(s), H 3 BO 3 (s), HCl(aq) and H 2 O(l), the standard molar enthalpies of formation of −(11173.1 ± 9.5) kJ · mol −1 for Li 6 Rb 5 B 11 O 22 and −(7145.1 ± 5.9) kJ · mol −1 for Li 4 Cs 3 B 7 O 14 were obtained on the basis of the appropriate thermochemical cycles.
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PROGRESS IN ORGANIC COATINGS
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2015
·
IF 2.358
Xuying Nan,Yi Huang,Qinguo Fan,Jianzhong Shao
Dye-linked initiators consisting of erythrosine B as a chromophore and ethyl 4-dimethylaminobenzoate as an electron donor linked by a different number of methylene units were prepared to achieve efficient photoinitiators of free radical polymerization in a visible-light region. The relative photoinitiating efficiencies of novel photoinitiators in photopolymerization of acrylates were evaluated. The results showed that the photoinitiating system composed of the dye-linked dyad with short methylene unit chain and diphenyliodonium salt exhibited a remarkable increase in the photoinitiation ability compared to unlinked three-component system. The enhancement mechanism aroused by the onium salt was investigated. These results showed that the excellent initiating efficiency of this system could be attributed to the favorable intramolecular photoinduced electron transfer and the close distance between reaction components caused by electrostatic interactions. This result demonstrated the importance and potential of the linked photoinitiator in the design of new efficient photoinitiators.
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RSC Advances
·
2015
·Vol. 5
·期 17
·12517-12529
·
IF 3.84
Xiangguo Meng,Yan Liu,Minjia Meng,Zheyu Gu,Liang Ni,Guoxing Zhong,Fangfang Liu,Zhaoyong Hu,Rui Chen,Yongsheng Yan
In this work, two novel Cs(I) ion-imprinted polymers (Cs(I)-IIP1 and Cs(I)-IIP2) have been prepared by surface imprinting technique based on support matrix of SBA-15. The strategy was carried out by introducing two different reversible addition–fragmentation chain transfer (RAFT) polymerization including using the free RAFT agent in solution and surface-anchored RAFT agent with appropriate initiation method, which is expected to generate a well-defined surface ion-imprinted polymer with excellent adsorption capacity. The materials were verified by FT-IR, SEM, TEM, nitrogen adsorption–desorption and TGA. Owing to the intrinsic advantages of surface-anchored RAFT polymerization, the resultant surface ion-imprinted polymer (Cs(I)-IIP2) exhibited more homogeneous and thinner polymer layer (15 nm) with excellent macrostructure in comparison to Cs(I)-IIP1 (75 nm) prepared by using the free RAFT agent in solution. Furthermore, the adsorption capacity of both polymers are compared, indicating that Cs(I)-IIP2 displays higher adsorption property and excellent selectivity for Cs(I).
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 314
·期 1
·289-295
·
IF 1.282
Chang Ling,Chang Shuquan,Han Wei,Li Zheng,Zhang Zheng,Dai Yaodong,Zhang Haiqian
Prussian blue (PB) nanoparticles were successfully synthesized via a γ radiation route in aqueous solutions using sugar as stabilizer at room temperature and ambient pressure. The particle size and shape can be affected by stabilizer and radiation conditions. When the stabilizer was sucrose and the radiation dose was 30 kGy, well-dispersed and uniform PB nanoparticles were obtained, which are 100–200 nm in diameter. They exhibit good ions exchange properties and have maximal Cs + adsorption capacity of 125.8 mg g −1 , which may be applied in radioactive wastewater treatments, ion battery etc.
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JOURNAL OF PHYSICAL CHEMISTRY B
·
2017
·
IF 3.177
Minglun Li,Bilin Zhuang,Yuyuan Lu,Zhen-Gang Wang,Lijia An
We present a novel method for obtaining salt polarizabilities in aqueous solutions based on our recent theory for the refractive index of salt solutions, which predicts a linear relationship between the refractive index and the salt concentration at low concentrations, with a slope determined by the intrinsic values of the salt polarizability and the density of the solution. Here we apply this theory to determine the polarizabilities of 32 strong electrolyte salts in aqueous solutions from refractive index and density measurements. Setting Li+ as the standard ion, we then determine the polarizabilities of seven cations (Na+, K+, Rb+, Cs+, Ca2+, Ba2+, and Sr2+) and seven anions (F–, Cl–, Br–, I–, ClO4–, NO3–, and SO42–), which can be used as important reference data. We investigate the effect of temperature on salt polarizabilities, which decreases slightly with increasing temperature. The ion polarizability is found to be proportional to the cube of bare ionic radius (rbare3) for univalent ions, but the relationship does not hold for multivalent ions. Contrary to findings of Krishnamurti, we find no significant linear relationship between ion polarizability and the square of the atomic number (N2) for smaller ions.
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INORGANICA CHIMICA ACTA
·
2017
·
IF 2.002
Muhammad Ali Khan,Yan-Yan Li,Shang-Xiong Huang-Fu,Hong Chen,Li-Jun Zhang,Peng-Fei Liu,Ju-Song Yu,Rui-Huan Duan,Ling Chen
A new anhydrous mixed alkali metals borophosphate, Li 3 Cs 2 BP 4 O 14 , has been synthesized by the solid-state reaction. Single crystal X-ray diffraction analysis reveals that the title compound crystallized in a tetragonal geometry with space group of P 4 2 / mbc (No. 135) and cell parameters of a = 10.3413(5) Å, b = 10.3413(5) Å, c = 12.042(2) Å. Its one-dimensional (1D) chain structure is constructed by fundamental building unit (FBU) of [B(P 2 O 7 ) 2 ] 5− which contains P–O–P connections with B:P = 1:4. Thermal analysis, UV–Vis-near-IR diffuse reflectance spectroscopy, IR spectroscopy and theoretical calculations have been well performed on this new borophosphate compound.
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