NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 21
·9663-9671
·
IF 2.7
Huimin Ren,Qiuchen Wang,Yanzhi Sun,Yongmei Chen,Pingyu Wan,Junqing Pan
Purification treatment is needed to control the concentration of SO42− and Ca2+ in brine to solve the problem of low electrolysis efficiency for the electrolysis of KCl solution in the chlor-alkali industry. However, the traditional barium method to remove SO42− faces the problem of high cost and environmental pollution. Herein, inexpensive and environmentally friendly anhydrous calcium chloride was used as the precipitant to replace barium chloride. The conditions for SO42− removal at room temperature were optimized by studying the precipitant doping ratio, reaction time, and stirring speed. The results indicated that the concentration of SO42− in brine could be reduced to less than 5 g L−1 at a raw material ratio of nCa2+ to nSO42− of 1.1 : 1, a stirring speed of 300 rpm, and a reaction time of 120 min. Ca2+ in the solution could be removed by introducing carbon dioxide, and the removal rate of Ca2+could reach 99.89% by adjusting the pH of the solution to an appropriate value. This work paves a new way for efficient brine refining to boost sustainable development in the chlor-alkali industry.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 15
·7218-7227
·
IF 7.233
Xuemei Dong,Dong Chen,Junshuai Zhou,Yan-Zhen Zheng,Xia Tao
ZnO as a promising electron transport layer (ETL) to TiO2 for perovskite solar cells (PSCs) has achieved a power conversion efficiency (PCE) of 18.9%; however, this is still lower than that obtained for TiO2-based PSCs (higher than 20%). Herein, we report the fabrication of high-efficiency methylammonium (MA) and Cs co-alloyed formamidinium (FA) triple cation perovskite based ZnO PSCs via delicate control of the cation compositions and annealing temperatures. By virtue of structural, morphological, spectral and electrochemical characterizations and analysis, we found that the incorporation of MA and Cs into FA perovskite enables the formation of a highly crystalline black phase perovskite with reduced surface roughness, which inhibits charge recombination and promotes electron transfer at the ZnO/perovskite/spiro-OMeTAD interfaces and hence improves Jsc and FF values of the cell. As a result, the ZnO PSC based on MA0.1FA0.75Cs0.15PbI3 annealed at 110 °C achieved a PCE as high as 20.09%, exceeding the previous highest efficiency recorded for ZnO ETL based PSCs. The optimized MA0.1FA0.75Cs0.15PbI3 material demonstrated excellent reproducibility and long-term cell durability under ambient conditions within 1000 h. Particularly, the incorporation of a small amount of Br into the triple cation perovskite, i.e., MA0.1FA0.75Cs0.15PbI2.9Br0.1 led to a further enhancement in PCE of up to 20.44%, which is comparable with the best-performing MA and Cs-containing FA-based lead halide TiO2 PSCs.
研究领域:
材料科学
·
能源技术
·
光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2022
·
IF 19.069
Ting Xiang,Ting Li,Miaosheng Wang,Wei Zhang,Mahshid Ahmadi,Xiaoyan Wu,Tianfei Xu,Meiqin Xiao,Long Xu,Ping Chen
It is always difficult to control the growth of crystals during the formation of multiple quantum wells (MQWs) in the quasi-2D perovskite light emitting diodes (PeLEDs). In this study, we introduce the 1, 4, 7, 10-tetraoxacyclododecane ether into the quasi-2D perovskite of PEA 2 Cs n-1 Pb n Br 3n+1 to reduce the coordination rate between the phenethylamine bromide and the perovskite framework. As a result, Crown-ether assisted in-situ grown (CAIG) perovskite crystals (PCs) is grown with thick PbBr 4 layers (n > 55) during the spin-coating. For the CAIG PCs, the generation of small n phases (n = 1, 2 and 3) are significantly suppressed, resulting in almost flat energy structure with the phases of n ≥ 4. The generation rate of the excited states of the n ≥ 4 remains ultra-fast within ~0.77 ps even without the MQWs structures; however the decay of excited states becomes much slower. The CAIG PCs film has lower trap density , therefore promoting the carrier mobility , carrier diffusion length and the photoluminescence quantum yield . The PeLEDs based on the CAIG PCs film achieves the maximum luminescence of ~27562 cd m −2 and the maximum external quantum efficiency (EQE) of ~16.1%. The half-lifetime of the luminescence and the EQE measured in the atmosphere (a relative humidity of ~52% at 27 ℃) are exceeding ~17 and 43 h, respectively. Hence, it can be recognized as the most ambient stable device based on the PEA 2 Cs n-1 Pb n Br 3n+1 perovskite.
研究领域:
材料科学
·
光电器件
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Marine Science and Engineering
·
2025
·Vol. 13
·期 5
·883
·
IF 2.8
Xiuqiong Deng,Ziyu Wang,Yuchun Qin,Liang Cao,Peng Cao,Yu Xie,Yingqi Xie
Combining the Microbial-Induced Calcium Carbonate Precipitation (MICP) technique with plants to reinforce calcareous sand slopes on reef islands is expected to achieve both reinforcement and economic benefits. In this study, MICP was combined withFestuca arundinacea(MICP-FA) for calcareous sand reinforcement. Based on water retention and scanning electron microscopy (SEM) tests, the water retention performance and mechanism of MICP-reinforced calcareous sand under different cementation solution concentrations and cementation cycles were analyzed. The growth adaptability ofFestuca arundinaceawas evaluated under different bacteria solution concentrations, cementation solution concentrations and cementation cycles. The engineering applicability of MICP-FA-reinforced calcareous sand was evaluated by wind erosion tests, and the synergistic reinforcement mechanism was analyzed. The results show that with the increase in the cementation solution concentration and cementation cycles, more calcium carbonate filled and adhered to the calcareous sand particles, significantly improving the water retention performance. MICP-FA can enhance the wind erosion resistance of calcareous sand. This synergistic mechanism lies in the surface cementation effect of MICP and the deep anchoring effect of plant roots. This study provides theoretical basis and technical guidance for engineering applications in calcareous sand areas.
研究领域:
土力学
·
环境工程
·
生态修复
✓ 已验证
产品关联
DOI
高影响因子
Pigment & Resin Technology
·
2022
·Vol. 53
·期 2
·133-136
·
IF 1.126
Wenjun Wang,Luting Shen,Yinsong Si,Islam MD Zahidul,Azim Abdullaev,Yubing Dong
PurposeSodium alginate (Na-Alg) is a natural polysaccharide with a rich and renewable production that is widely used in the food, pharmaceutical and daily necessities industries, among other fields. The purpose of this study is to obtain a green and degradable shape memory material, calcium alginate (Ca-Alg) film was prepared and the mechanical properties, the shape memory effect of the film were investigated and confirmed.Design/methodology/approachThe Ca-Alg films were prepared by Na-Alg, calcium chloride (CaCl2) solution, and flow extension method. Dissolve sodium alginate powder, remove bubbles, pour into petri dish, dry at 60°C, add calcium chloride solution cross-linking and finally dry naturally. The effect of CaCl2solution concentration on the mechanical properties of the films were investigated and discussed by universal tensile tester. The shape memory behavior and degradation performance of thin films were verified and studied by the fold-deploy shape memory test and soil embedding method, respectively.FindingsThe Ca-Alg films exhibited good mechanical and shape memory properties, with a 72.2% shape memory fixity ratio and a 92.3% shape memory recovery ratio, respectively. For a period of 120 days, the film treated with a 6 wt% CaCl2solution degraded at a rate of approximately 53%.Research limitations/implicationsShape memory polymers (SMPs) as intelligent materials are an important research direction for the development of modern high-tech materials. On the other hand, plastic pollution is a major problem today; as a result, preparing green degradable SMPs is essential.Originality/valueThis study synthesized transparent and degradable shape memory Ca-Alg films using Na-Alg and CaCl2solution and the flow extension method.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 5
·3613-3627
·
IF 1.674
Sun Zhiguo,Feng Run,Zhang Li,Xie Hongyong
A new method of carbon capture and sequestration (CCS) by sodium humate (HA–Na) and Ca(OH) 2 from carbide slag (CS) solution was proposed. The effects of various operating parameters, such as the additive amount of HA–Na, pH, temperature, gas flow rate, CO 2 inlet concentration, and stirring rate on both the Ca ion concentration and Ca conversion rate were investigated in a lab-scale bubbling reactor. The synergistic mechanism of HA–Na and Ca(OH) 2 from CS on CCS is also put forward and demonstrated. The experimental results indicate that HA–Na may improve significantly the CCS capability of CS since the Ca conversion rate of CS is increased 10% by HA–Na additive. The pH is a key factor for the CO 2 absorption process and HA–Na may lower the rate of pH decrease of Ca(OH) 2 solution. The increasing temperature, stirring rate, and CO 2 inlet concentration are favorable to CO 2 capture, as well as low gas flow rate. Ca(OH) 2 from CS mixed with HA–Na solution shows good performance in CO 2 uptake, and the Ca conversion rate reaches 99% with 100 mL of Ca(OH) 2 (1.5 g/L) solution mixed with 0.1 g HA–Na at 40 °C, a gas flow rate of 0.1 L/min, and an inlet CO 2 concentration of 100% at ambient pressure. Moreover, calcite CaCO 3 is is identified as the main product of CO 2 capture by X-ray diffraction and scanning electron microscopy analysis.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 10
·4897-4910
·
IF 3.3
Daryoush Sanaei,Mohammad Hadi Dehghani,Hamidreza Sharifan,Monika Jain,Bahram Roshan,Javier A. Arcibar-Orozco,Vassilis J. Inglezakis
Mixed perovskites have vast industrial potential, but some challenges (i.e., aggregation and chemical instability) limit their applications. Herein, a novel environment-friendly carbon aerogel (CAg) synthesized from sodium alginate (SA) was used as a precursor to create a double-B-site perovskite/carbon aerogel hybrid adsorbent ((Sr0.7Mn0.3Co0.5Fe0.5O3−δ)/CAg) (DB-perovskite/CAg hybrid). The adsorbent was extensively characterized via different techniques, including X-ray photoelectron spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The removal efficiency for crystal violet (CV) and acid yellow 17 (AY17) was conducted over various pH, adsorbent/adsorbate dosages, and reaction times in an aqueous system. The maximum adsorbed concentration (Qmax) recorded by 206 mg g−1 and 113 mg g−1 for CV and AY17, respectively, and compared to the performance of only DB-perovskite (114 mg g−1 and 59 mg g−1), respectively. The adsorption site energy distribution was studied by applying the density functional theory (DFT). The adsorption on the DB-perovskite/CAg hybrid was significantly regulated by pH change. The cooperative metal active/Lewis acid sites of the DB-perovskite/CAg adsorbent led to a faster and higher adsorption capacity toward CV and AY 17. The doping of Mn indicated a synergistic effect in improving the adsorption of either dye through the introduction of abundant active sites and strengthening of metal-functional groups (–C–O–C, –COOH, and C–OH/O–H)–π aromatic bonding, confirmed by DFT calculations.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 32
·10965-10972
·
IF 6.4
Mingming Liu,Qun Wan,Xinrong Liao,Wenji Zhan,Changwei Yuan,Qinggang Zhang,Mengda He,Cong Zou,Meitian Pan,Long Kong,Liang Li
Perovskite nanocrystals, which are well-known for their outstanding optoelectronic properties, have attracted widespread attention for several photonic and optoelectronic technologies. However, the inherent instability of perovskite nanocrystals limits their practical applications. Therefore, herein, we developed a calcium- and fluorine-ion combined-treatment method to enhance the stability of perovskite nanocrystals, which not only exhibited near unity photoluminescence efficiency and cubic morphology, but also possessed excellent photostability and thermal resistance. Additionally, the light-emitting diodes incorporating these perovskite nanocrystals showed pure green electroluminescence with a maximum external quantum efficiency of 11.85%, luminance as high as 20 940 cd m−2, and stable operation for up to 172 min.
研究领域:
材料科学
·
光电技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Xiaoshan Dong,Jian Wang,Fawei Lin,Jian Li,Tianxiao Yu,Beibei Yan,Guanyi Chen
Photothermal steam reforming (PTR) has emerged as an attractive approach for catalytic tar removal, due to the excitation of the photothermal synergistic effect. However, the role of oxygen species in PTR is still unclear. In this paper, the effect of alkaline earth metals (Ca and Sr) A-site-substitution on perovskite LaNi 0.6 Mn 0.5 O 3 was investigated to reveal the role of oxygen species in PTR. The substitution of alkaline earth metals into perovskite lattice affected the dispersion of nickel and significantly adjusted the active oxygen species content on the catalyst surface. Oxygen species are crucial to the carbon deposition behavior of catalysts in PTR. La 0.7 Ca 0.3 Ni 0.6 Mn 0.5 O 3 was rich in reactive oxygen species, which effectively inhibited the deposition and graphitization of coke, resulting in its good coke resistance and catalytic stability in PTR. Ultraviolet–visible light (UV–vis) supported the formation of oxygen vacancies and the dissociation of H 2 O to hydroxyl radicals through the photochemical reaction, which ultimately increased the surface adsorbed oxygen contents. Meanwhile, UV–vis promoted the migration and reaction of lattice oxygen. The photoactivation of oxygen species by UV–vis effectively enriched active oxygen species and improved the coke resistance, which resulted in enhanced catalytic stability of PTR at low-temperature.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2024
·Vol. 13
·期 12
·1943
·
IF 4.7
Lingyu Han,Yaoyao Li,Bing Hu,Wei Wang,Jianming Guo,Jixin Yang,Nuo Dong,Yingmei Li,Tingting Li
Recently, phosphorylation has been applied to peptides to enhance their physiological activity, taking advantage of its modification benefits and the extensive study of functional peptides. In this study, water-soluble peptides (WSPs) of sea cucumber ovum were phosphorylated in order to improve the latter’s calcium binding capacity and calcium absorption. Enzymatic hydrolysis methods were screened via ultraviolet-visible absorption spectroscopy (UV–Vis), the fluorescence spectrum, and calcium chelating ability. Phosphorylated water-soluble peptides (P-WSPs) were characterized via high-performance liquid chromatography, the circular dichroism spectrum, Fourier transform infrared spectroscopy (FTIR), UV–Vis spectroscopy, surface hydrophobicity, and fluorescence spectroscopy. The phosphorus content, calcium chelation rate and absorption rate were investigated. The results demonstrated that phosphorylation enhanced the calcium chelating capacity of WSPs, with the highest capacity reaching 0.96 mmol/L. Phosphate ions caused esterification events, and the carboxyl, amino, and phosphate groups of WSPs and P-WSPs interacted with calcium ions to form these bonds. Calcium-chelated phosphorylated water-soluble peptides (P-WSPs-Ca) demonstrated outstanding stability (calcium retention rates > 80%) in gastrointestinal processes. Our study indicates that these chelates have significant potential to develop into calcium supplements with superior efficacy, bioactivity, and stability.
研究领域:
生物化学
·
食品科学
·
营养学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2022
·
IF 3.752
Xue-yi GUO,Zhao-wang DONG,Yang XIA,Pei-dong LIU,Han-ning LIU,Qing-hua TIAN
A high-purity Ti–48Al–2Nb–2Cr alloy powder with an oxygen content as low as 0.0572 wt.% and a particle size of <150 μm was produced from a mixture of TiO 2 , Al 2 O 3 , Nb 2 O 5 , and Cr 2 O 3 powders through reduction with magnesium and deoxidation with calcium. The phase and composition of the products were analyzed. The final product mainly included γ -TiAl and minor α 2 -Ti 3 Al phases, and Ti, Al, Cr, and Nb were homogenously distributed in the powder with a mole ratio of 49.73:43.51:2.05:1.98. The reduction and deoxidation mechanisms were investigated by thermodynamic modeling using the HSC Chemistry software and Pandat software based on the Ti alloy database.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
INFLAMMATION RESEARCH
·
2024
·
IF 4.8
Su Pan,Li Zibo,Yan Xiangli,Wang Baoying,Bai Ming,Li Yucheng,Xu Erping
Objective and design Mast cells (MCs), as the fastest immune responders, play a critical role in the progression of neuroinflammation-related diseases, especially in depression. Quercetin (Que) and kaempferol (Kae), as two major diet-derived flavonoids, inhibit MC activation and exhibit significant antidepressant effect due to their anti-inflammatory capacity. The study aimed to explore the mechanisms of inhibitory effect of Que and Kae on MC activation, and whether Que and Kae suppress hippocampal mast cell activation in LPS-induced depressive mice. Subjects and treatment In vitro assays, human mast cells (HMC-1) were pretreated with Que or Kae for 1 h, then stimulated by phorbol 12-myristate 13-acetate (PMA) and 2,5-di-t-butyl-1,4-benzohydroquinone (tBHQ) for 3 h or 12 h. In vivo assays, Que or Kae was administered by oral gavage once daily for 14 days and then lipopolysaccharide (LPS) intraperitoneally injection to induce depressive behaviors. Methods The secretion and expression of TNF-α were determined by ELISA and Western blotting. The nuclear factor of activated T cells (NFAT) transcriptional activity was measured in HMC-1 stably expressing NFAT luciferase reporter gene. Nuclear translocation of NFATc2 was detected by nuclear protein extraction and also was fluorescently detected in HMC-1 stably expressing eGFP-NFATc2. We used Ca 2+ imaging to evaluate changes of store-operated calcium entry (SOCE) in HMC-1 stably expressing fluorescent Ca 2+ indicator jGCamP7s. Molecular docking was used to assess interaction between the Que or Kae and calcium release-activated calcium modulator (ORAI). The hippocampal mast cell accumulation and activation were detected by toluidine blue staining and immunohistochemistry with β-tryptase. Results In vitro assays of HMC-1 activated by PtBHQ (PMA and tBHQ), Que and Kae significantly decreased expression and secretion of TNF-α. Moreover, NFAT transcriptional activity and nuclear translocation of NFATc2 were remarkably inhibited by Que and Kae. In addition, the Ca 2+ influx mediated by SOCE was suppressed by Que, Kae and the YM58483 (ORAI inhibitor), respectively. Importantly, the combination of YM58483 with Que or Kae had no additive effect on the inhibition of SOCE. The molecular docking also showed that Que and Kae both exhibit high binding affinities with ORAI at the same binding site as YM58483. In vivo assays, Que and Kae significantly reversed LPS-induced depression-like behaviors in mice, and inhibited hippocampal mast cell activation in LPS-induced depressive mice. Conclusions Our results indicated that suppression of SOCE/NFATc2 pathway-mediated by ORAI channels may be the mechanism of inhibitory effect of Que and Kae on MC activation, and also suggested Que and Kae may exert the antidepressant effect through suppressing hippocampal mast cell activation.
研究领域:
药理学
·
神经科学
·
免疫学
·
分子生物学
✓ 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）