ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 51
·111611-111626
·
IF 5.8
Cheng Wenyu,Ma Xiaoying,Chen Haoyu,Chen Rongsheng,Wang Dongtian
The excessive presence of phosphate can cause eutrophication in water bodies. Yttrium has an extremely high affinity for phosphorus and is capable of forming stable complexes at low concentrations. Moreover, limitations in the resourcefulness of drinking water treatment residues were observed. In this study, a highly efficient phosphorus removal adsorbent (RJDWTR@Y) was prepared by calcination-alkali leaching-yttrium-loaded composite modification employing domestic drinking water treatment residue as raw material. And the effects of multiple factors on phosphate adsorption by RJDWTR@Y were examined. The results illustrated that the maximum adsorption capacity of the RJDWTR@Y for phosphate was 319.76 mg/g, with the chemical reaction of the multilayer as the predominant adsorption process. The adsorption mechanism is electrostatic gravitational force and the inner sphere complexation effect. RJDWTR@Y was effective against interference even at high concentrations of the coexisting anion. After five cycles, the desorption efficiency of phosphate was 75.11%. Filling the fixed bed with the material can efficiently remove phosphorus from the flowing liquid. The synthesis of RJDWTR@Y and the results of the study indicated that it has good application prospects. In addition to efficiently removing phosphorus, it can also recycle waste and achieve sustainability. Graphical abstract
研究领域:
环境科学
·
水处理
·
吸附技术
·
废物回收
·
污染控制
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DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2016
·Vol. 31
·期 6
·1201-1205
·
IF 0.4
Khan Karim,Li Jia,Zou Wenwei,Xu Wei,Yang Ye,Song Weijie
Single-phase insulating 12CaO∙7Al 2 O 3 (C12A7) powder was synthesized using an optimized hydrothermal method. Pure phase of C12A7 was got at a comparatively lower temperature (c.a. 300 °C) than that has been previously reported. The crystallite size of the synthesized C12A7 powder was 7±2 nm. The surface area values calculated for all the samples at a synthesis temperature range of 250-800 °C for 5 h were in the range of about 19-24 m 2 /g, with pore sizes of 12-20 nm. This low-temperature-based synthetic strategy along with nano porous structures and a high surface area value can facilitate catalyst application.
研究领域:
材料科学
·
无机化学
·
纳米技术
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 78
·期 3
·606-612
·
IF 1.473
Su Rong,Gao Jinwei,Deng Surong,Zhang Ruhe,Zheng Yuhui
Sensors bearing functional units that could transform the chemical recognition into readable signals due to binding to single or even more targets have received much attention. Here, two F − /Cu 2+ optical sensors based on lanthanide edifices were designed. The f – f forbidden transitions of lanthanide elements differ significantly from organic compounds since they exhibited favorable features such as narrow emissions and high color purity. Europium(III) complex of 2-(3-carboxyphenyl)imidazo[4,5-f]-1,10-phenanthroline (Eu-1) and europium(III) ternary complex of 2-(3-carboxyphenyl)imidazo[4,5-f]-1,10-phenanthroline and dibenzoylmethane (Eu-2) showed on–off changes in responses to the guest species. The excitation wavelength of Eu-2 could be extended to nearly visible light range, and this longer wavelength sensitisation will be useful in the selection of cheap laser sources. Generally organic complexes suffered from the instabilities in practical uses, the encapsulation of indicators into hosts will be necessary. Therefore, the lanthanide containing hybrid films which were composed of cross-linked siloxane and polymeric matrices were also prepared. The inorganic–organic film could be excited at 410 nm and demonstrated improved thermal stability. Moreover, we could detect F − and Cu 2+ in aqueous mixed solution and this feature would be favorable for future uses. Graphical F − /Cu 2+ optical lanthanide sensors were designed. The excitation wavelength of europium(III) complex with 2-(3-carboxyphenyl)imidazo[4,5-f]-1,10-phenanthroline and dibenzoylmethane (Eu-2) could be extended to nearly visible light range. Moreover, the Eu-2 doped film with cross-linked siloxane and polymeric hosts was also prepared.
研究领域:
材料科学
·
分析化学
·
光学传感
·
无机化学
·
聚合物科学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 10
·1-13
·
IF 2.02
Yang Jiangbing,Gao Jianping,Wang Xiaoxue,Mei Shunkang,Zhao Ruiru,Hao Chaoyue,Wu Yongli,Zhai Xiangang,Liu Yu
Porous polyacrylamide hydrogel (PAM) was prepared by polymerization at room temperature. Cadmium sulfide/polyacrylamide hydrogels (CdS/PAM) was synthesized by in situ loading CdS nanoparticles and used for photocatalytic decomposition of water for the first time. The size distribution of the loaded CdS nanoparticles is 3–12 nm. We studied the enhanced photocatalytic activity and photo-corrosion inhibition of CdS/PAM the compared with pure CdS and probed the mechanism of the improvement. In particular, the CdS/PAM prepared in 0.003 M CdCl 2 solution exhibited the highest hydrogen production efficiency of 2.929 mmol g −1 h −1 , about 79 times that of pure CdS. The results demonstrate that the formation of new N–Cd bond and high transmittance of CdS/PAM dramatically enhance photocatalytic activity. The electron cloud of nitrogen atom can attract holes and repel photogenerated electrons, which lowers the carrier recombination probability. The results also reveal that the excellent hydrophilicity of hydrogel plays an important role in the inhibition of photocorrosion. In addition, CdS/PAM is easily recycled and processed. The present work will pave a good way for the application of smart hydrogels in the field of photocatalytic hydrogen production.
ᅟ
研究领域:
材料科学
·
光催化
·
纳米技术
·
氢能
·
高分子化学
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DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 6
·1641-1650
·
IF 3.146
Ling Yang,Wu Jiang,Yang Lingtao,Liu Dongjing
The emission of mercury from anthropogenic activities is a serious concern in both developed and developing countries due to its high toxicity and persistence. Here, carbon nitride nanosheets (CNNS) were attained via a two-step thermal etching method and applied for Hg 0 removal. Proper deposition of ZnS can markedly reinforce the Hg 0 capture ability of CNNS. 10ZnS/CNNS notably outperforms ZnS and CNNS at 100 °C, which is primarily attributed to surface chemisorbed oxygen species and polysulfide active sites. Besides, Hg 0 adsorption and thermal catalytic oxidation pathways are further disclosed using quantum chemistry calculations based on density functional theory (DFT). The calculation results show that the presence of zinc species is beneficial to the decomposition of adsorbed oxygen, which plays a key role in the catalytic oxidation of Hg 0 , thereby contributing to the enhancement of mercury removal performance.
研究领域:
环境科学
·
材料化学
·
理论与计算化学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 6
·1102-1107
·
IF 1.063
Hu Keyan,Xu Zian,Liu Yiting,Huang Fuqiang
Due to the quite sluggish charge-carrier separation in semiconductor photocatalysts, the photocatalytic activity of these materials is still far inferior than anticipated. Herein, a novel approach to reducing the packing factor(PF) of ZnIn 2 S 4 semiconductors to improve the charge-carrier separation is offered. The well-crystallized Zn 1 - x In 2 S 4- x ( x =0, 0.05, 0.1) powders were productively prepared through solid-state reactions. Their structures were verified by the high-resolution transmission electron microscopy, powder X-ray diffraction, and X-ray photoelectron spectroscopy. The PF values of Zn 1 - x In 2 S 4- x ( x =0, 0.05, 0.1) samples were calculated to be 0.683, 0.651, and 0.618, respectively. The reduction of the PF for Zn 1 - x ImS 4- x with increasing x can promote the separation of photoexcited carriers, and this process was endorsed by their photoelectric response and photoluminescence emission spectra. The Zn 0.9 In 2 S 3.9 sample with a lower PF value presents roughly 21 times higher photocurrent density and four times higher photodegrading rate of methyl orange than those of pristine ZnIn 2 S 4 .
研究领域:
材料科学
·
光催化
·
半导体物理
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DOI
高影响因子
Science China-Materials
·
2020
·Vol. 63
·期 12
·2539-2550
·
IF 6.098
Wang Chenyi,Tao Zhengwang,Zhou Yuanpeng,Zhao Xiaoyan,Li Jian,Ren Qiang,Guiver Michael D.
Increasing the local charge density of flexible side-chain cations in the hydrophilic segments of anion exchange membranes (AEMs) is helpful for improving their properties. However, due to limitations of structural design strategies and available synthetic methods, very few AEMs with more than four flexible side-chain cationic groups in hydrophilic segments have been reported. In order to further improve the hydroxide conductivity, alkaline stability and dimensional stability, herein we report a series of AEMs containing eight flexible side-chain cations in hydrophilic segments, based on poly(aryl ether sulfone)s (PAES). The synthesis, ion exchange capacity (IEC), water absorption, dimensional swelling, alkaline stability and hydroxide conductivity of the obtained membranes (PAES-8TMA-x) were examined and the relationships between structures and properties of different types of AEMs were also systematically compared. The resulting AEMs with IEC values of 1.76–2.76 mmol g −1 displayed comprehensively desirable properties, with hydroxide conductivities of 62.7–92.8 mS cm −1 and dimensional swelling in the range of 8.3% to 15.8% at 60°C. The IEC and hydroxide conductivity for a representative sample, PAES-8TMA-0.35, maintained 82.2% and 79.6% of the initial values after being immersed in 2 mol L −1 NaOH at 90°C for 480 h, respectively. This study expands the design and preparation of AEMs containing high local densities of flexible side chain cations, and provides a new strategy for new AEM materials.
研究领域:
材料科学
·
高分子化学
·
能源材料
·
电化学
·
膜技术
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DOI
高影响因子
Science China-Materials
·
2021
·Vol. 64
·期 11
·2667-2674
·
IF 8.273
Yin Hang,Kong Qingkun,Zhang Ruiling,Zheng Daoyuan,Yang Bin,Han Keli
Lead-free double perovskite nanocrystals (NCs), such as Cs 2 AgInCl 6 , have attracted considerable attention as stable and non-toxic alternatives to lead-based perovskites. However, the low photoluminescence (PL) intensity of pristine Cs 2 AgInCl 6 limits its practical applications. In this study, a series of Cs 2 AgIn 1− γ − x Bi x La γ Cl 6 NCs were synthesized to break the parity-forbidden transition and modify the associated optical functionalities. A broadband bright warm-white emission in the visible region was achieved, with an excellent PL quantum yield of 60%. The dynamic mechanism, involving ultrafast transient absorption, suggests that high-efficiency PL is induced by triplet self-trapping exciton emission. The incorporation of La 3+ -Bi 3+ facilitated the singlet-triplet transition by increasing the lifetime and quickening the intersystem crossing process. This finding provides a reliable method for optimizing the optical properties of emerging lead-free halide perovskite NCs.
研究领域:
材料科学
·
光子学
·
纳米技术
·
光电子学
·
半导体物理
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 2
·1-11
·
IF 2.278
Zhang Qiang,Yang Ping,Chen Hsueh Shin,Huang Baibiao,Shen Jianxing
Phosphonic and carboxylic acids were used as capping agents to fabricate CdSe nanocrystals (NCs) through organic synthesis, leading to a controlled growth of the NCs with adjustable morphologies from dots to rods. The binding energies and steric hindrance of ligands dramatically affected the growth kinetics of CdSe NCs, and therefore the resulting geometry of NCs. The detailed investigations of ligand effect on the growth of NCs and an efficient control over the NCs morphology were presented. CdSe nanorods (NRs) with various aspect ratios were created for studying relation between the diameter of NRs and photoluminescence (PL). Consequently, a synergic use of PL spectra and transmission electron microscopy images allowed us to systematically investigate the relationship between morphology and PL properties of as-prepared CdSe rods. The PL properties of CdSe NRs were finally found to be strongly diameter dependent and weakly related to their lengths.
研究领域:
纳米材料
·
半导体纳米晶体
·
光电子学
·
胶体化学
·
光物理
✓ 已验证
DOI
高影响因子
IONICS
·
2016
·Vol. 22
·期 11
·2087-2093
·
IF 2.119
Yang F.,Yu Z.,Meng B.,Zhu Y. J.,Yang Q. Q.,Lin Z. L.,Zhou H. M.,Liang X. L.
The Sr 1 − x
Na
x
SiO 3 − x /2 samples (SNS, x = 0.2, 0.3, 0.4, 0.45) were prepared by spark plasma sintering (SPS) at a lower sintering temperature of 850 °C for a shorter holding time of 5 min. All SNS samples by SPS are composed of single monoclinic SrSiO 3 phase, and the grain sizes are in the range of 1.9 ± 0.5 μm. The measurement results of the electrical properties show that the conductivities of SPS samples are one order of magnitude higher than those of the samples by traditional sintering method. The ion transference numbers of SNS samples by SPS are all higher than 0.99 in the temperature range of 500∼650 °C, which demonstrates that the SNS has met the requirements as solid oxide fuel cell electrolytes and the SPS process is a promising candidate for preparations of SNS electrolytes.
研究领域:
材料科学
·
陶瓷
·
固态离子学
·
能源材料
✓ 已验证
DOI
高影响因子
Science China-Physics Mechanics & Astronomy
·
2024
·Vol. 67
·期 4
·1-8
·
IF 6.4
Qiao Yuxi,Wang Fuyi,Wang Huaiqiang,Tao Zicheng,Jiang Zhicheng,Liu Zhengtai,Cho Soohyun,Zhang Fayuan,Meng Qingkai,Xia Wei,Yang Yichen,Huang Zhe,Liu Jishan,Liu Zhonghao,Zhu Zengwei,Qiao Shan,Guo Yanfeng,Zhang Haijun,Shen Dawei
Unconventional fermions in the immensely studied topological semimetals are the source for rich exotic topological properties. Here, using symmetry analysis and first-principles calculations, we propose the coexistence of multiple topological nodal structure in LaSb 2 , including topological nodal surfaces, nodal lines and in particular eightfold degenerate nodal points, which have been scarcely observed in a single material. Further, utilizing angle-resolved photoemission spectroscopy, we confirm the existence of nodal surfaces and eightfold degenerate nodal points in LaSb 2 . The intriguing multiple topological nodal structure might play a crucial role in giving rise to the large linear magnetoresistance. Our work renews the insights into the exotic topological phenomena in LaSb 2 .
研究领域:
凝聚态物理
·
拓扑材料
·
量子材料
·
电子结构理论
✓ 已验证
DOI
高影响因子
Science China-Physics Mechanics & Astronomy
·
2023
·Vol. 67
·期 1
·1-6
·
IF 6.4
Zhang Yuhang,Liu Cong,Zhu Xiyu,Wen Hai-Hu
Recent claim of discovering above-room-temperature superconductivity ( T c ≈400 K) at ambient pressure in copper doped apatite Pb 10 (PO 4 ) 6 O has stimulated world-wide enthusiasm and impulse of motion. A lot of follow-up works have been carried out with controversial conclusions. To check whether superconductivity is really present or absent in the material, we need samples which should have a rather pure phase of Pb 10− x Cu x (PO 4 ) 6 O. Here we report the characterization results from the Pb 10− x Cu x (PO 4 ) 6 O with a fraction of about 97 wt.% inferred from the fitting to the X-ray diffraction pattern, if assuming Cu 2 S as the only impurity. The resistivity measurements show that it is a semiconductor characterized roughly by a ln(1/ T ) temperature dependence in wide temperature region without trace of superconductivity. Magnetization measurements show that it has a general ferromagnetic signal with a weak superparamagnetic background. Many grains of the sample show clear interactions with a NbFeB magnet. The detected Cu concentration is much lower than the expected nominal one. Our results show the absence of metallicity and superconductivity in Pb 10− x Cu x (PO 4 ) 6 O at ambient pressure, and suggest the presence of strong correlation effect.
研究领域:
凝聚态物理
·
材料科学
·
超导性
·
磁性
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DOI
高影响因子
危险品化学品经营许可证（带存储）