ACS Omega
·
2018
·
IF 0
Shuaishuai Ma,Peng Xu,Zhilan Cai,Hengfei Qin,Xiaofei Fu,Zewu Zhang,Zhaolian Ye,Jinjuan Xue
A novel environmental decalcifying agent was prepared with allylpolyethoxy amino carboxylate (APEAA), hydroxyethyl acrylate (HEA), and maleic anhydride (MA) by means of free-radical polymerization in an aqueous solution. The morphology and structure of the samples were characterized through scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectrometry, and 1H nuclear magnetic resonance (1H NMR) spectra. The molecular-weight distribution of APEAA–HEA–MA was determined by the gel permeation chromatography method. APEAA–HEA–MA was used as a green decalcifying agent to remove calcium from crude petroleum, and the impact of factors such as monomer ratio, copolymerization time, dosages, and desalination temperature was analyzed. It is found that the decalcification rate of APEAA–HEA–MA could reach to its maximum, and the calcium removal efficiency was approximately 97.88% when the monomer molar ratio of APEAA–HEA–MA was 1:2:5, the reaction time of copolymerization was 2 h, the dosage was 100 ppm, and the desalination temperature was 100 °C. This research work can promote the exploration on facile synthesis of a novel terpolymer and its potential application in refinery desalting processes.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
Nanoscale
·
2021
·Vol. 13
·期 35
·14915-14924
·
IF 7.79
Weihai Sun,Jinjun Zou,Xiaobing Wang,Shibo Wang,Yitian Du,Fengxian Cao,Lan Zhang,Jihuai Wu,Peng Gao
Regardless of the impressive progress that perovskite solar cells (PSCs) have achieved, especially considering their power conversion efficiency (PCE) over 25%, traditional PSCs still contend with an inherent instability with exposure to humidity, which remains as a critical issue for the realization of commercial production. Herein, we proposed an effective pathway to relieve the instability of PSCs without sacrificing efficiency by introducing a 2D phase at the surface of the 3D perovskite film, based on a novel organic cyclohexylmethylammonium iodide (CMAI). The self-assembled thin 2D capping layer atop the 3D perovskite layer can not only reduce the ionic defects, but also serve as a protective barrier against moisture. Consequently, the champion device incorporating 2D perovskite capping layers delivered an open-circuit voltage (Voc) of 1.19 V, which contributes to an impressive PCE of 22.06% on account of the improved charge extraction and decreased non-radiative recombination. More importantly, an excellent long-term stability along with mitigated hysteresis was observed for the modified devices as a result of the suppressed ion migration and high humidity resistance of the 2D perovskite film. Our finding provides a comprehensive approach for simultaneously enhancing the efficiency and stability of PSCs through dimension engineering utilizing CMA-based 2D perovskite materials.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Saudi Chemical Society
·
2018
·
IF 2.456
Henghui Huang,Qi Yao,Qi Jiao,Bailing Liu,Hualin Chen
In order to improve the scale inhibition efficiency of existing polyepoxysuccinic acid (PESA) and to study the impact of their molecular structure on scale inhibition efficiency, a series of PESA with linear and hyper-branched structure have been designed and synthesized through co-polymerization reaction with glycidyl and epoxy succinate. The scale inhibition behavior of PESA with linear and hyper-branched structure against CaCO 3 and CaSO 4 scales was evaluated using static scale inhibition method, and their ability to retard deposition of CaCO 3 was also examined. The experimental results showed that, for CaCO 3 and CaSO 4 , the PESA with hyper-branched structure provides a scale inhibiting efficiency as high as 95.9% and 94.3%, respectively, at an inhibitor concentration of 15 mg/L. In addition, the processes of crystal nucleation, growth and crystal morphology have been analyzed. The experimental results show that the PESA with hyper-branched structure not only prolongs the induction period of CaCO 3 crystal nucleation, but also reduces the number of crystal nuclei and changes the size and morphology of the CaCO 3 crystal. Moreover, the FTIR, SEM and XRD analyses showed that the PESA with hyper-branched structure can induce the irregularity of growing CaCO 3 crystal, destroy the formation of crystals and change the polymorphs of calcium scale crystal. This conclusion indicates that the prepared PESA with hyper-branched structure has great potential for applying in the treatment of industrial water.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 108
·期 4
·e20286
·
IF 3.5
Shu Li,Wenjie Wei,Guangyu Wang,Zemeng Weng,Boya Zhang,Zhanmin Cao
The phase equilibria information of the CaO–SbO x system in the range of 700–1580°C in air was obtained for the first time using quenching method and thermal analysis. The equilibrium phase compositions were determined using x-ray diffraction and Scanning Electron Microscopy-Energy Dispersion Spectrum. The invariant reaction temperatures were determined using thermogravimetry-differential scanning calorimetry. A perovskite solid solution between Ca 2 Sb 2 O 7 and CaO, designated as (Ca 6 Sb 2 O 11 ) s.s , was observed. Within this solid solution, three polymorphic forms were identified: orthorhombic, tetragonal, and cubic. The transition temperatures between these polymorphic forms vary with compositional changes. Additionally, the crystal structure of cubic Ca 6 Sb 2 O 11 was analyzed. CaSb 2 O 6 was observed to decompose into Ca 2 Sb 2 O 7 , Sb 4 O 6 , and O 2 above 1336 ± 5°C. The eutectic temperature of α-Sb 2 O 4 and CaSb 2 O 6 was found to be 1220 ± 5°C.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2021
·
IF 1.797
Ming Ma,Bing Zhang,Weipeng Lu,Yihu Wang,Xiaofeng Cao,Yanchuan Guo
Calcium carbonate (CaCO 3 , CC) distributes diversely among the abiotic and biogenic minerals/biominerals. It has six phases (three anhydrous crystalline, two hydrates and one amorphous). Phase selectivity of the synthetic CC is of considerable interest and determines its physicochemical properties and destinated applications. In the present study the reactive crystallization process of CC has been subjected to the treatment of different disturbances, i.e., mechanical stirring (ms), ultrasonication (us), and composed ms + us at lower temperature (0 ± 1℃) and higher supersaturation condition (initial concentration of Ca 2+ is 0.1 M), in comparison with the quiescent condition. In order to gain insight on the role of these disturbances in controlling the crystallization process, nature, crystal habits of precipitated CC and their consecutive phase transformation, samples were collected at different time intervals (30 s, 1 min, 5 min, 10 min, 20 min, 45 min and 60 min) for investigation. Results reveals that these disturbing ways play a significant role on the CC crystallization process and can stabilize the amorphous calcium carbonate (ACC) phase for prolonged periods of time (1–60 min) in aqueous solution, which will be a powerful way for large-scale fabrication of pure ACC nanoparticles (about 100 nm) without addition of any chemicals. Longer disturbing time tends to transform the pure and spherical ACC nanoparticles competitively into spherical vaterite particles and rhombohedral calcite particles through the self-assembly of nanoparticles aggregation or Ostwald ripening mechanism, respectively. The investigation also suggested that the reactive crystallization of CC with the three disturbances undergoes a non-classical crystallization pathway to crystallize CC particles, in comparison with the quiescent reference condition. To the best of our knowledge, the report on reactive crystallization of CC crystallites as a function of different disturbances is first of its kind in the literature.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chen Zeng,ZhiWei Jiang,Yongjian Zeng,Suyu Zhang,Rafael Luque,Kai Yan
H 2 -rich syngas production via microwave-assisted pyrolysis (MAP) of lignocellulosic biomass has recently gained significant attention in biorefineries. Herein, a novel pearl-like calcium oxide (P-CaO) was developed to investigate the dual roles of CaO in H 2 enhancement and CO 2 absorption during MAP of lignocellulosic biomass, dedicated to achieving high production of H 2 -rich syngas. Utilizing a self-constructed MAP system, the different catalytic performance between P-CaO and other metal oxides were examined, revealing that our P-CaO produced the highest H 2 yield (257 NmL/g corn stover , 7.6 times higher than no-catalyst group and 2.2 times higher than commercial CaO group), and lowest CO 2 production (44 NmL/g feedstock ), with syngas purity exceeding 72 vol% at 600°C. This increase in H 2 -rich syngas production demonstrated universal applicability across other biomass feedstocks. Finally, the study delved into the microstructural changes and phase transition mechanisms of P-CaO, shedding insights into gas formation pathways. The P-CaO nanoparticles, with abundant alkaline sites, excellent adsorption capacity and large specific surface area due to aggregate, facilitate the secondary cracking of organic intermediates like phenols, thus promoting the production of H 2 , while CO 2 adsorption derives a favorable shift in the water–gas shift equilibrium. These findings are expected to offer critical insights and serve as a reference for the development of efficient catalysts in the next-generation hydrogen industry.
研究领域:
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Yuyang Zhao,Zhaoyang Sun,Gang Qiao,Xu Fang,Binmeng Chen
Given that CO 2 chamber and high inner pressure are needed in the traditional carbonation curing, we propose an in-situ internal carbonation by mesoporous silica nanoparticles (MSN) to tackle the challenge, leveraging its high specific surface area. In this study, MSN was functionalized with γ-aminopropyl triethoxy silane (MSN-amine), followed by reacting with CO 2 (CO 2 carrier) and mixing with alite paste. Phase transformation and nucleation behavior were investigated by conducting comparative in-situ carbonation of alite paste, utilizing MSN-amine in two configurations: one adsorbing CO 2 (MSN-amine-AC) and the other desorbing CO 2 (MSN-amine-DC). Results indicated that semi-crystalline C-S-H is produced in alite paste containing MSN-amine-DC (Ap-MSN-DC) through pozzolanic reaction while amorphous calcium carbonate (ACC) is generated in alite paste with MSN-amine-AC (Ap-MSN-AC) via in-situ carbonation, both of which promote the early reaction of alite. Additionally, low Ca/Si ratio calcium silicate hydrate (C-S-H) with negative electric potential developed as MSN-amine-DC gradually eroded, collapsed, and chemically transformed into reactive sites. Conversely, the ACC generated in MSN-amine-AC blocks the mesopores, inhibits the pozzolanic reaction and preserves the silica skeleton. Subsequently, calcite is crystallized via the dissolved ACC and embedded itself on the surface of C-S-H with positive electric potential, turning to nucleation sites physically. To conclude, the proposed in-situ internal carbonation models for MSN-amine-modified alite paste offer insights into microstructural evolution.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2019
·
IF 3.413
Shi-Xiang Song,Yang-Fan Cheng,Xiang-Rui Meng,Hong-Hao Ma,Wen-Tao Wang,Wen-Yuan Wang,Shuai-Qi Sun
The explosion characteristics and influential factors of suspended calcium carbide (CaC 2 ) dust were studied using a 20-L spherical vessel. Acetylene (C 2 H 2 ) and calcium hydroxide (Ca(OH) 2 ) are the reaction products of CaC 2 and water. Therefore, C 2 H 2 /Ca(OH) 2 mixture was used as the reference sample in the experiment. Experimental results showed that the water content in the environment (air relative humidity and external water drops) had significant impacts on CaC 2 dust explosion. The explosibility of CaC 2 dust enhanced with the increasing air relative humidity In the experiments, CaC 2 dust and dry water were equally proportioned when the value of stoichiometric ratio R was 1. When the concentration of hybrid CaC 2 /dry water increased, the value of P ex of CaC 2 /dry water explosion rose first and then stabilized at 0.74 MPa, and the value of (d P /dt) ex showed a trend of rising first and then declining after reaching the maximum value of 238.25 MPa s −1 . P ex and (d P /dt) ex of pure C 2 H 2 explosion and C 2 H 2 /Ca(OH) 2 hybrid explosion increased at the early stage and then decreased for the increasing C 2 H 2 content. P ex and (d P /dt) ex of the three samples increased in the following order: hybrid CaC 2 /dry water < hybrid C 2 H 2 /Ca(OH) 2 < pure C 2 H 2 . Dry CaC 2 dust did not explode, but its explosibility was significantly enhanced for the increasing water content in the environment, and the main reason was the existence of C 2 H 2 .
研究领域:
安全工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2017
·
IF 5.099
Lingjun Kong,Meina Han,Kaimin Shih,Minhua Su,Zenghui Diao,Jianyou Long,Diyun Chen,Li'an Hou,Yan Peng
Recovering phosphorus (P) from waste streams takes the unique advantage in simultaneously addressing the crisis of eutrophication and the shortage of P resource. A novel calcium decorated sludge carbon (Ca-SC) was developed from dyeing industry wastewater treatment sludge by decorating calcium (Ca) to effectively adsorb phosphorus from solution. The X-ray diffraction (XRD) and Fourier transform infrared (FTIR) techniques were used to characterize the Ca-SCs, followed by isotherm and kinetic sorption experiments. A preferred design with CaCO 3 to sludge mass ratio of 1:2 was found to have a sorption capacity of 116.82 mg/g for phosphorus. This work reveals the crucial role of well-dispersed nano-rod calcium on the Ca-SC surface for the sorption of phosphorus. Moreover, the decoration of nano-rod calcium was found to further promote the uptake of phosphorus through the formation of hydroxylapatite (Ca 5 (PO 4 ) 3 (OH)). Thus, the development of decorated Ca-SC for sorption of phosphorus is very important in solving the P pollution and resource loss.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2021
·
IF 9.709
Yongqing Xu,Tai Zhang,Bowen Lu,Cong Luo,Fan Wu,Xiaoshan Li,Liqi Zhang
Calcium looping process (CaLP) is one of the most perspective thermochemical energy storage (TCES) strategies to meet the demands of developing the 3rd generation concentrated solar power plants (CSP) in the CO 2 Brayton cycle. However, the CaO-based heat carriers inevitably experienced severe sintering over the cycles, and their energy storage capacities deteriorated drastically. Research on the energy storage capacity of the CaO-based heat carriers in a closed-loop calcium looping process for thermochemical energy storage (CaLP-TCES; i.e., calcining the CaO-based materials under CO 2 -rich stream, which is much practical in the industry) is rare. Hence, this work employed a novel recipe to synthesize a variety of organic acid–modified CaO-based heat carriers to explore their thermochemical energy storage performance in a new closed-loop CaLP-TCES system. The energy storage capacity of the materials was evaluated by a simultaneous thermal analyzer (TGA/DSC), and the mechanism behind their promising energy storage performance was explored by X-ray diffraction, field emission scanning electron microscopy, N 2 physisorption, reaction kinetics method and so on. Results showed that glycine modified eggshell (“Glycine eggshell”) was an effective heat carrier for the CaLP-TCES system. After 60 repeated cycles at “650 °C – 900 °C,” “Glycine eggshell” accumulated an energy storage capacity of 110.124 kJ/g, which was approximately six times higher than that of “Raw eggshell”. Comprehensively considered the effect of carbonation temperature and calcination temperature on the energy storage/releasing performance of the “Glycine eggshell” materials, “750 °C – 900 °C” was the best option for the closed-loop CaLP-TCES system for the concentrated solar power plants. After glycine modification, the rich mesoporous and macroporous structure in the CaO-based material was generated, thereby improved cyclic thermochemical energy storage performance.
研究领域:
材料科学
·
可再生能源
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2021
·Vol. 11
·期 11
·1287
·
IF 2.589
Yue Han,Rong Wen,Feng Zhang,Linlin Shi,Wenyan Wang,Ting Ji,Guohui Li,Yuying Hao,Lin Feng,Yanxia Cui
High-quality, all-inorganic CsPbBr3/Cs4PbBr6composite perovskite nanocrystals (NCs) were obtained with all-solution-processing at room temperature, and a photodetector (PD) with high detectivity was realized based on CsPbBr3/Cs4PbBr6NCs. The detectivity (D*) of the proposed PD is 4.24 × 1012Jones under 532 nm illumination, which is among the highest levels for PDs based on all-inorganic perovskite NCs. In addition, a high linear dynamic range (LDR) of 115 dB under 1 V bias was also realized. Furthermore, the underlying mechanism for the enhanced performance of the proposed PD was discussed. Our work might promote the preparation of high-performance PDs based on dual-phase all-inorganic perovskite nanocrystals.Keywords:all-inorganic lead halide perovskite;CsPbBr3;Cs4PbBr6;perovskite nanocrystals;photodetector
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Shuo Yan,Yun Li,Jilin Cao
The calcium nitrate (Ca(NO 3 ) 2 ) waste generated from the production of nitrophosphate fertilizers brings about serious environment and human health issues. Using Ca(NO 3 ) 2 waste and ammonium bicarbonate (NH 4 HCO 3 ) fertilizer as raw materials, higher-value spherical calcite mesocrystals have been synthesized via precipitation method. The synthesis conditions are optimized from the aspects of dispersant, crystal control agent and reaction temperature, and the mechanism that regulates the size and morphology of calcite is illustrated. The synthesized spherical calcite mesocrystals exhibit the small particle size of ca. 5 µm and high specific surface area of 84.44 m 2 /g. Under the dispersion effect of polyvinylpyrrolidone, the adsorption of crystal control agent citric acid on the calcite particles results in the formation of the spherical mesocrystal morphology. The yield of calcite in this process could reach 94.3%. Ca 2+ ion remaining in the mother liquor are further removed in the form of CaCO 3 by addition of calcium oxide , and a mixture of ammonium nitrate and a small amount of NH 4 HCO 3 is obtained by concentrating the filtrate, which can be used as nitrogen fertilizers. This work provides a new insight into the low-cost synthesis of spherical calcite mesocrystals with the high specific surface area and the comprehensive utilization of Ca(NO 3 ) 2 waste.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）