JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Kaiming Zhu,Zhanglin Chen,Yuzhen Wang,Hui Liu,Yude Niu,Xin Yi,Yihuan Wang,Xuanyi Yuan,Guanghua Liu
Eu 2+ -doped CaAlSiN 3 ‐type structure nitrides have been extensively studied as a red-emitting phosphors in white light emitting diodes (w-LEDs), but there are few reports of systematic research on the effect of solid solution substitution on their long persistent luminescent properties. In this work, a series of (M,Ca)AlSiN 3 :Eu 2+ (M = Sr, Mg) phosphors have been successfully synthesized by efficient combustion synthesis . We investigated the effect of Sr and Mg solid solution on long persistent luminescent properties. Thermoluminescence (TL) measurements were performed in those persistent phosphors to obtain direct experimental results on the trap depth. The results show that the SrAlSiN 3 :0.2 at% Eu 2+ phosphor exhibits the most intense red persistent luminescence with the persistent time of as long as 200 min at the threshold value of 0.32 mcd/m 2 due to the presence of more trap levels with suitable depths of 0.71 eV. Compared with the solid solution of Sr, the solid solution of Mg ions can increase the depth of trap levels in CaAlSiN 3 . Among them, Mg 0.2 Ca 0.8 AlSiN 3 :0.2 at% Eu 2+ phosphor achieved a maximum trap depth of 0.98 eV, making it a promising candidate for optical information storage applications.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Yuxin Zhang,Yong Wang,Duo Wang,Zhiyu Zhang,Tao Qi,Qingchun Guo
Superwettability modification of membrane surface has attracted extensive attention for efficient oil/water emulsion separation in view of membrane antifouling. The design of micro- and nanoscale structure on membrane surface, which plays an important role in improving wettability is significant but remains challenging. In this study, inspired by polyphenols coating and multifunctional metal-phenolic networks (MPNs), a series of superwettable membranes with double-layer and hierarchical structure derived from PCA coating and various CA-metal ions (nanoparticles) networks were facilely obtained. Specifically, the PCA former layer provided hydrophilic basis, and the CA-metal ions (nanoparticles) networks provided hierarchical micro- and nanoscale structures. The obtained membranes with double layer and hierarchical structures were thus bestowed superhydrophilic, underwater superoleophobic and antifouling features, which made it capable of efficient oil/water emulsion separation with high oil rejection (all higher than 98.8 %). In addition, the obtained membranes possessed satisfactory self-clean ability, stability, and mechanical property. The demonstrated PCA/CA-metal ion (nanoparticles) derived strategy for double-layer and hierarchical structures modification in this work may offer a pave way to endow various materials with superwettability and antifouling property for multiple applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 13
·50099
·
IF 2.52
Dan Zhang,Dehai Meng,Zhongying Ma,Zhihao Zhang,Haozhe Ning,Yuhua Wang
To optimize the poor thermal stability and flammable of polyvinyl alcohol (PVA), a novel environmental-friendly organic–inorganic hybrid flame retardant Ca(H 2 PO 4 ) 2 @HCCP was successfully designed and synthesized via surface treatment technology and used to advance the flame retardancy of PVA. The thermogravimetric analysis implied that Ca(H 2 PO 4 ) 2 @HCCP can enhance significantly the thermal stability and char forming ability of PVA. Combustion results demonstrate that Ca(H 2 PO 4 ) 2 @HCCP could effectively suppress the melt dripping of PVA in the process of combustion. The presence of Ca(H 2 PO 4 ) 2 @HCCP can sharply reduce peak heat release rate and the total heat release up to 75% and 22.9%, respectively, in the microscale combustion calorimeter measurement. The results manifested that Ca(H 2 PO 4 ) 2 @HCCP could endow PVA with superior flame retardancy. Moreover, char residues analysis explained the flame retardant mechanism in condensed and gas phase, which is mainly attributed to the strong catalytic char formation, free radical trapping, and gas barrier effect. Therefore, the green flame retardant has great application s prospect in fire safety.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Dan Zheng,Bo Bai,Yunhua He,Na Hu,Honglun Wang
The multi-responsive controlled-release system could enhance crop yield while improving utilization efficiency of agrochemicals, and minimize environmental pollution caused by agrochemicals overuse. This work reports a novel Ca-alginate/Poly( N -isopropylacrylamide)@polydopamine (Ca-alginate/PNIPAm@PDA) microsphere to control the agrochemicals release. Microsphere with a semi-interpenetrating network, which contained pH-sensitive Ca-alginate, temperature-sensitive poly( N -isopropylacrylamide) (PNIPAm), and sunlight-sensitive polydopamine (PDA), was characterized by thermogravimetric analysis , zeta potential , Fourier transform infrared spectroscopy , and scanning electron microscopy to prove the successful synthesis. Moreover, the comprehensive performances, including photothermal conversion, water absorbency, water retention, and controlled-release agrochemicals behaviors, were systematically investigated. The results indicated that the composite microsphere was a prosperous water and agrochemicals manager to effectively retain water and control the release of agrochemicals by external stimulation. Consequently, the Ca-alginate/PNIPAm@PDA microsphere with outstanding water-retention and controlled-release capacities is economical and eco-friendly and thus is promising for utilization as water and agrochemicals controlled-release carrier material in agriculture applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 9
·1832
·
IF 3.06
Yang Zhou,Miao Yang,Dongshen Tong,Haiyan Yang,Kai Fang
An effective and friendly method was developed for the production of reducing sugars (RS) from the hydrolysis of cellulose over the solid catalyst of Ca-montmorillonite (Mt) grafted by non-acidic ionic liquid (Mt-IL) in water. The effect of mass ratio, water dosage, reaction temperature, and time were investigated in a batch reactor. Raw Mt showed only a 7.9% total reducing sugars (TRS) yield for the catalytic hydrolysis of cellulose in water. As the Mt was grafted by -SO3H and IL, the TRS yield greatly increased under the same reaction conditions. The highest TRS yield of 35.7% was obtained on the catalyst of Mt grafted by non-acidic IL at 200 °C with the mass ratio of catalyst to cellulose of 0.2 for 120 min. The high TRS yield for Mt-IL should be attributed to the synergistic effect of the dissolution of cellulose by IL and the exposed metal ions on the layer with water. Although the yield of TRS on Mt-IL decreased gradually with recycling runs, the decrease after the first run was not very serious compared to the fresh catalyst. This work provides a promising strategy for efficient cellulose hydrolysis into fine chemicals by Mt with non-acidic IL.Keywords:montmorillonite;ionic liquid;cellulose;hydrolysis;reducing sugars
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 43
·14839-14846
·
IF 4.029
Ruru Ma,Dongdong Xu,Yun Yang,Xin Su,Binghua Lei,Zhihua Yang,Shilie Pan
Two new isostructural rare-earth oxyborates ScMO(BO3) (M = Ca and Cd) with a three-dimensional (3D) cationic framework and parallel arranged [BO3] triangles have been synthesized by the flux method. In the 3D cationic framework, an interesting sandwich-like basic building unit (BBU) is constructed by two ∞1[Ca(1)O4]6− chains and two ∞1[Sc(1)O4]5− chains. ScMO(BO3) melt incongruently, which shows that title compounds can be grown by the flux method. The UV cut-off edges for ScCaO(BO3) and ScCdO(BO3) are 230 and 249 nm, respectively. In addition, the first-principles calculations are performed to gain further insights into the relationship between the microscopic electronic structures and associated optical properties.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xuan Hou,Shuhua Ma,Xiaohui Wang,Ruiping Liu,Muhammad Ibrahim
In the study of hydrothermal conversion of fly ash to calcium silicate hydrates (C–S–H), the concentration of Ca and Si in the liquid phase plays a vital role in determining the hydrothermal transformation results. This paper selected a fly ash as a research object, which can leach a high Si concentration into the solution in the hydrothermal process even in a slight alkaline solution, based on a new finding when studying the alkali dissolution kinetics of different fly ashes. To explore the effects of Ca and Si concentrations in the liquid phase on the hydrothermal transformation of fly ash to tobermorite or katoite, Na 2 SiO 3 (Na 2 O·xSiO 2 ·yH 2 O) and CaSO 4 were used to change the concentration of Si and Ca in the liquid in the hydrothermal system. Characterization methods such as XRD, SEM, infrared spectroscopy, and solid-state nuclear magnetic resonance indicated that a little more concentration of Si can promote the transformation from fly ash to tobermorite and persuade the conversion of the Si–O tetrahedron in C–S–H from Q 2 to Q 3 and Q 4 . However, too high a liquid Si concentration made the hydrothermal product change to colloidal calcium silicate. On the other hand, a high Ca concentration in the liquid was found to lead to the conversion of the hydrothermal product from tobermorite to katoite. According to the above results, the deep transformation from fly ash to tobermorite under the conditions of a low temperature of 160 °C and no extra alkali addition was achieved by the induction of a small quantity of Na 2 SiO 3 .
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuan Zeng,Yuanyuan Wang,Linyao Ke,Qiuhao Wu,Xiaojie Tian,Liangliang Fan,Kirk Cobb,Yuhuan Liu,Roger Ruan,Yunpu Wang
The pyrolysis of metal soaps to produce hydrocarbon rich fuel has been studied extensively. However, the combined effects of microwave radiation and metal ion types on hydrocarbon production have not been addressed. In this study, the microwave and conventional pyrolysis experiments were conducted on five metal soaps (Li soap, Na soap, K soap, Ca soap, Mg soap). The results demonstrated that the metal ions at the carboxyl end of the soap enhanced the polarity of the reactants, leading to a rapid increase in temperature under microwave conditions. With the ion radius increasing, the heating rate increased gradually. Compared with conventional pyrolysis, microwave pyrolysis exhibited a more rapid heating rate, a higher degree of carbon chain fracture, and a greater abundance of small olefin compounds, which promoted aromatization reaction and the release of CO, H 2 and CH 4 . In addition, the composition of the pyrolysis products derived from different metal soaps is affected by the characteristics of metal ions. As the radius of metal ions increased, the oxygen content in the liquid products decreased gradually, while the carbon content increased. The strengthening effect of microwave was further analyzed. With the increase in the radius of metal ions, the strengthening effect of microwaves on olefins formation was gradually weakened, while the inhibiting effect on alkanes formation was gradually enhanced. The structure of carboxylate network is affected by the radius of metal ions, which results in the regular change of the strengthening effect of microwave on olefins and other products. This study is highly significant in guiding the pyrolysis of soapstock waste to prepare olefins and alkanes with high efficiency and low energy consumption.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Chenyu Yang,Qian Yao,Liangzhong Li,Xian Xiao,Lun Lu,Chang Liu,Chunyou Zhu,Sihui Zhan,Haoran Yuan
The biochar with single Ca atom (1.7 wt%) loaded nanoscale zero-valent iron composites (Fe@Ca-N-C) were prepared and effectively degraded tris(2-chloroethyl) phosphate (TCEP) via Fenton-like oxidation. Systematic experiments and theoretical calculations indicated that the enhanced removal of TCEP was attributed to the synergistic effect of adsorption (Ca-N x sites) and degradation (Fe sites). Remarkably, the optimal system of 0.1 g L −1 Fe@Ca-N-C, 1 mM peroxydisulfate (PDS) achieved 99.5 % TCEP degradation (2 mg L −1 ) in 30 min and maintained 100 % TCEP removal for 72 h in continuous-flow reaction column. The Ca-N x sites exhibited high adsorption energy for TCEP (especially the Ca-N 1 sites), and the Fe sites (Fe(0) and Fe(Ⅱ)) activated PDS into HO•, which quickly degrades the adsorbed TCEP through C-O bond breaking and C-Cl bond hydroxylation. This study provided insights into single Ca atom utilization and TCEP pollution remediation.
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Wenbing Wang,Tiantian Gong,Hui Li,Yiming Liu,Qianling Dong,Rixia Zan,Yulin Wu
This work developed calcium alginate (CA) embedded zero-valent iron (ZVI@CA) and CA embedded biochar (BC) immobilized microorganism (BC&Cell@CA) gel beads as alternative to conventional Fe 0 permeable reactive barriers for treating groundwater contaminated with 2,4,6-trichlorophenol (2,4,6-TCP). Lab-scale and field-scale biochar-microorganism augmented PRBs (Bio-PRBs) were constructed and tested. The underlying mechanisms were revealed by a multi-source data calibrated multi-process reaction model, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and high-throughput sequencing. Moreover, calibrated advection-dispersion ( a ) coupled with the two-site sorption ( K d ) and chemical-biological multi-process reaction ( λ ) model were used for revealing 2,4,6-TCP transport behavior and optimizing Bio-PRBs. Compared to that in the ZVI@CA (0.004 h –1 ) system, the reaction rate (0.011 h –1 ) of 2,4,6-TCP increased by 175% in the combined chemical-biological batch system. Moreover, chemical-biological augmentation significantly improved the retardation effect of Bio-PRBs for 2,4,6-TCP. It came from that chemical-biological augmentation significantly decreased the dispersivity a (0.53 to 0.20 cm), and increased the distribution coefficient K d (2.20 to 19.00 cm 3 mg –1 ), the reaction rate λ (2.40 to 3.60 day –1 ), and the fraction (30% to 80%) of first-order kinetic sorption of 2,4,6-TCP in the lab-scale one-dimensional Bio-PRBs. Moreover, versatile functional bacteria Desulfitobacterium was crucial in the transformation of Fe (III) iron oxides. The diversity and richness of archaea in the reaction solution were improved by ZVI@CA gel beads addition. Furthermore, the field-scale reaction system was designed to remediate the chlorinated organic compounds and Benzene Toluene Ethylbenzene & Xylene contaminated groundwater in a pesticide factory site. The field test results demonstrated it is a promising technology to construct vertical reaction columns or horizontal Bio-PRBs for the efficient remediation of actually contaminated groundwater.
研究领域:
环境工程
·
化学工程
·
微生物学
·
地下水修复
✓ 已验证
DOI
PubMed
高影响因子
RARE METALS
·
2025
·
IF 11
Ding Kaiwei,Zhao Guanfei,Qiu Tingsheng,Qiu Xianhui,Yan Huashan,Wu Hao,Yang Wenhui,Yan Shunde,Lin Liqiang
Silver is a crucial rare and valuable metal in industrial applications, primarily found in polymetallic sulfide deposits as sulfides. The adsorption compatibility between various types of associated silver ores and collectors has not been extensively studied. This research focuses on acanthite (Ag 2 S), the predominant mineral in such ores. The study systematically investigates the adsorption compatibility differences between dithiophosphate collectors with five distinct substituents and associated silver ores. This investigation combines computational chemistry simulations with experimental validations. The findings reveal that the −N 2 PS 2 − -type collector exhibits superior surface matching with acanthite (100) surface compared to the −O 2 PS 2 − -type collector. Moreover, the presence of −C−O−C− bonds and benzene rings enhances the effectiveness of dithiophosphate-type collectors for acanthite. In contrast, the compatibility of the −C 2 PS 2 − -type 3418A collector, lacking characteristic groups, is relatively poor. In high-alkali processes, the adsorption of Ca(OH) + hinders the reactivity of silver atoms with the collector. The presence of benzene rings and −NH− groups in the substituents intensifies the impact of Ca(OH) + on the collector, thereby diminishing its adsorption strength. The introduction of −C−O−C− does not modify the sensitivity of the −O 2 PS 2 − -type collector to Ca(OH) + . Furthermore, the adsorption of alkane −C 2 PS 2 − -type collectors on mineral surfaces remains unaffected by the attenuating effect of Ca(OH) + . The results of the flotation tests, Zeta potential, and adsorption capacity assessments further validated the conclusions derived from computational chemistry analyses. The results provide valuable insights for the future design and advancement of innovative collectors customized for silver ore applications.
研究领域:
矿物加工
·
表面化学
·
计算化学
·
浮选化学
·
提取冶金学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Ji Qi,Mingzheng Liao,Chao Wang,Zhiqiang Jiang,Ying Chen,Bo Liang,Qingbin Song
Indirect hydrogen production routes presented extensive compatibilities for distributed solid oxide fuel cell systems . Catalyst activity directly determines hydrogen production and profoundly affects the power generation . In this work, Ce 1-x M x NiO 3-λ (M = Al, Ti and Ca) were synthesized for hydrogen production from propane partial oxidation (POx). From the results, it indicated that the choice of catalyst compositions could directly affect the microstructure during the preparation process. Also, different Ce 1-x M x NiO 3-λ catalysts displayed distinctive carbon tolerance performances due to the different active particle sizes and surface properties of the catalysts. In general, the synthesized Ce 1-x M x NiO 3-λ catalysts showed higher hydrogen production than a commercial nickel cerium catalyst. From the observation of a SOFC test system powered by injecting the generated H 2 from catalytic propane POx reaction, the obtained power density of CNO–Al displayed an increase of 22.6% compared to the commercial nickel cerium catalyst. It was quite impressive that the equivalent hydrogen (160 ml/min) produced over CNO–Al and the obtained power density (482.6 mW/cm 2 ) of SOFCs were competitive while CNO–Ca presented an excellent stability with a better carbon tolerance performance for the long-term tests. The achievements of this work might offer a novel point of view for developing low-cost catalyst towards indirect hydrogen production for SOFC.
研究领域:
能源科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）