JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Peng Zhang,Song Wang,Bingjie Pang,Xuefeng Zhu,Weishen Yang
High temperature dual-phase mixed conductor membranes are promising for CO 2 separation and utilization. Most efforts are focused on materials, thickness, microstructural features and surface modifications of the electronic conducting phase. Here, we unveil the effect of the carbonate-ionic conducting phase on CO 2 permeation process with a dense NiO-based dual-phase membrane. The results demonstrate that the CO 2 flux increases first and then decreases with the increase of Li 2 CO 3 addition amount. The controlling step of CO 2 permeation changes from bulk diffusion to surface reaction as much more Li 2 CO 3 was added into the carbonate-ionic conducting phase. Model analysis indicates that the peroxide formation process on the membrane surface is the rate-limiting step, which is closely related to the oxygen solubility of molten carbonate.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
Wang Lin,Cheng Wen-Chieh,Xue Zhong-Fei,Rahman Md Mizanur,Xie Yi-Xin,Hu Wenle
Inappropriate irrigation could trigger migration of heavy metals into surrounding environments, causing their accumulation and a serious threat to human central nervous system. Traditional site remediation technologies are criticized because they are time-consuming and featured with high risk of secondary pollution. In the past few years, the microbial-induced carbonate precipitation (MICP) is considered as an alternative to traditional technologies due to its easy maneuverability. The enzyme-induced carbonate precipitate (EICP) has attracted attention because bacterial cultivation is not required prior to catalyzing urea hydrolysis. This study compared the performance of lead (Pb) and copper (Cu) remediation using MICP and EICP respectively. The effect of the degree of urea hydrolysis, mass and species of carbonate precipitation, and chemical and thermodynamic properties of carbonates on the remediation efficiency was investigated. Results indicated that ammonium ion (NH4+) concentration reduced with the increase in lead ion (Pb2+) or copper ion (Cu2+) concentration, and for a given Pb2+ or Cu2+ concentration, it was much higher under MICP than EICP. Further, the remediation efficiency against Cu2+ is approximately zero, which is way below that against Pb2+ (approximately 100%). The Cu2+ toxicity denatured and even inactivated the urease, reducing the degree of urea hydrolysis and the remediation efficiency. Moreover, the reduction in the remediation efficiency against Pb2+ and Cu2+ appeared to be due to the precipitations of cotunnite and atacamite respectively. Their chemical and thermodynamic properties were not as good as calcite, cerussite, phosgenite, and malachite. The findings shed light on the underlying mechanism affecting the remediation efficiency against Pb2+ and Cu2+.
研究领域:
环境科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
Acta Geotechnica
·
2025
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IF 5.7
Yang Guokun,Zheng Shaojun,Liu Tianle,Luo Enhao,Tang Chengxiang,Qu Bo,Lei Gang,Jiang Guosheng
Enhancing the efficiency of microbially induced carbonate precipitation (MICP) for soil stabilization is of significant importance for reducing costs and shortening construction timelines, ultimately improving the applicability of MICP technology in engineering. This study developed a novel biocarrier material (Dia@AP-DE) to enhance the efficiency of MICP in cementing sand by immobilizing microorganisms and diversifying calcium carbonate cementation forms. Dia@AP-DE was chemically modified to graft –NH 2 groups onto its surface. These groups protonate to form positively charged –NH 3 + groups, enabling the tight adsorption of negatively charged bacteria through Coulombic interactions. MICP was applied to reinforce sand columns from group B (free bacteria) and group BDAD (Dia@AP-DE immobilized bacteria), and a series of experiments were conducted to analyze the biocarrier’s effects on cementation efficiency, calcium carbonate morphology, and pore structure. Additionally, flow channel evolution within the sand columns was simulated using AVIZO software. The results showed that the BDAD group formed more diverse calcium carbonate cementation forms, particularly the formation of “calcium carbonate bridges.” The bacteria immobilized on Dia@AP-DE produced additional layers of calcium carbonate, which acted as bridges between sand particles, reducing the distance required for effective cementation. Furthermore, flow simulation results indicated that the “calcium carbonate bridges” optimized the uniformity of flow channels within the sand columns during the early stages of injection. Unconfined compressive strength (UCS) tests showed that the strength of the BDAD group was significantly improved at all injection cycles, with UCS values of 1.02 MPa and 5.88 MPa after 3 and 11 injections, respectively, which were 4.6 and 2.0 times higher than those of B group. This study provides a potential new approach for enhancing the efficiency of biocemented soils.
研究领域:
土木工程
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环境微生物学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2019
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IF 1.901
Luyang Lyu,Li Xiao,Juntao Lu,Lin Zhuang
In this work, we explore the possibility of using MnCO 3 as active material for alkaline rechargeable batteries. K 2 CO 3 solution is chosen as electrolyte because the solubility of MnCO 3 in K 2 CO 3 electrolyte keeps lower than that in KOH electrolyte of the same pH values, which may promote the cyclability of MnCO 3 . XRD and XPS measurements reveal a two-electron transfer reaction during cycling, corresponding to the conversion of MnCO 3 /MnO 2 . Further investigations demonstrate the MnCO 3 electrode can be cycled 50 cycles without obvious capacity decay and the coulombic efficiency keeps over 95.0% after the 8th cycle. The present study provides a new perspective in searching new electrode materials and electrolyte systems for alkaline rechargeable batteries.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Processes
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2023
·Vol. 11
·期 4
·1075
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IF 3.5
Zhaochen Huang,Guoqiang Huang
Usually, the ion implantation gases used in semiconductor production are required to be extremely high in purity. Due to the presence of trace CO2in electronic special gas BF3, the quality of the material is significantly affected, which makes it crucial to impose control on CO2content. Unlike a series of blank adsorbents reported in other studies, the zinc-loaded adsorbents prepared in this study are intended for the adsorption of CO2from CO2/BF3. Firstly, the materials were characterized by XRD, BET, SEM-EDS and TG-DSC analysis, etc., and the breakthrough curves of the adsorbents as obtained under different preparation conditions were investigated at 20 °C and 200 kPa. The results show that the adsorption performance reached the optimal level when the activation temperature was 450 °C and a 13X molecular sieve was impregnated by 0.15 mol/L Zn(NO3)2. Moreover, compared with the Zn-13X, the breakthrough time was reduced to 69% and 44% in two adsorption cycles, respectively. Finally, FTIR was used to reveal the adsorption mechanism of the carbonates produced by CO2adsorption. It was found that the adsorption performance was affected by the irreversible reduction in the number of active sites due to the continuous formation of polydentate carbonate during adsorption and regeneration.Keywords:CO2adsorption;13X molecular sieve;carbonate species
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2022
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IF 5.477
Tianhao Han,Weiwei Chen,Yawen Cai,Zhimin Lv,Yifeng Zhang,Xiaoli Tan
Background Due to the randomly distributed nature of uranium contamination, remediation strategies often concentrate on in-situ immobilization. Limestone can limit the migration of uranium through its spontaneous replacement reaction with phosphate, and achieve uranium immobilization. Methods In this study, the immobilization of uranium in the deposition process of hydroxyapatite was investigated. The effect of carbonate concentration on the reaction process was studied by adding Na 2 CO 3 . Significant findings The deposition process is accompanied by the immobilization of uranium by co-precipitation. The immobilization (92.6%) of uranium (0.52 mmol/L) is due to the formation of calcium uranyl phosphate, increasing carbonate concentration has a significant inhibitory effect on uranium immobilization, and the 50 Mm carbonate can reduce the uranium immobilization efficiency by nearly 20%. XRD, FTIR, Raman, XPS, EA and fluorescence spectroscopy proved that co-precipitation, complexation, and encapsulation were the main mechanisms of uranium immobilization. Through determining the ratios of type-A and type-B substitutions, it reveals the immobilization of uranium weakens due to the competition of carbonate and phosphate. Our study provides the deposition of uranium in the geosphere should be taken into account for remediation and radioactive pollution disposal.
研究领域:
环境科学
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放射性污染治理
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Xiaoye Bi,Dong Xue,Yunpeng Wang,Chencheng Lv,Zexiong Li,Tao Zhao
This research aims to develop a durable and formaldehyde-free flame retardant treatment for cotton fabrics. Phosphorous acid (PA) is employed in conjunction with urea and guanidine carbonate to chemically bond the flame retardant to the cellulose fibers of the fabric. The treated fabrics are evaluated for their flame resistance, comfort, breathability, aesthetics, fire performance, carbon residue, limiting oxygen index, thermal stability, combustion behavior, and fabric properties. The results demonstrate successful grafting of PA onto cotton fabrics, leading to enhanced flame resistance while maintaining the desired fabric characteristics. The treated fabrics exhibit improved fire performance with increased carbon residue from 4.03% to 28.19% and higher LOI values from 18.0% to 43.5%. Moreover, the thermal stability of the fabric is enhanced, resulting in altered combustion behavior characterized by reduced the total heat release from 11.1 kJ/g to 0.1 kJ/g. Importantly, the flame-retardant treatment does not significantly impact the wettability or stiffness of the fabric. This study presents a simple and effective approach to produce highly efficient fire-resistant cotton fabrics, holding promise for various applications where fire safety is a concern.
研究领域:
材料科学
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纺织工程
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消防安全
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jianzhang Gao,Jiaqi Chen,Huitao Lv,Xingan Feng,Shitao Liao,Zhidong Wen,Yongde Yan,Yun Xue,Fuqiu Ma
Uranium is valuable metal, and it is of great significance to develop a simultaneous separation process of uranium and cesium from radioactive wastewater. Herein, a process was designed to separate sequentially uranium and cesium from wastewater. By comparing the limiting ability of OH − and CO 3 2− to Co 2+ , Cd 2+ , and Sr 2+ ions, it was found that CO 3 2− could effectively limit the above ions to the solid phase. The result of X-ray photoelectron spectroscopy (XPS) and species analysis revealed that the restriction was achieved through complexation. Through this property, more than 99.9 % of cobalt and cadmium were limited in the solid phase, and U-Cs co-separation was realized. Furthermore, the results of cyclic voltammetry and XPS indicated that U(VI) could be reduced in the liquid phase, but Cs(I) could not, which was the basis for uranium and cesium separation. And more than 99.5 % of uranium was separated from cesium by the electrochemical separation process. Simultaneously, effective separation of uranium and cesium under different pHs has been achieved via selective uranium leaching using carbonate. The co-separation combined with electrochemical separation realized the recovery of pure uranium products, indicating a large potential for realizing uranium resources in wastewater.
研究领域:
环境科学
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核化学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Yi Wei,Xiying Jia,Yifei Chen,Jianbing Ji
Molten carbonate pyrolysis with steam on fir sawdust was conducted to produce activated carbon, in which physical and recycling chemical activation was combined with carbonization as a single step process. The effects of temperature, molten carbonate pyrolysis and steam flow rate on the activated carbon were investigated. The BET results showed an excellent specific surface area of 822.02 m 2 /g and a pore diameter of 2.39 nm. The adsorption capacities of the activated carbon achieved ideal values on methylene blue and iodine and reached a removal capacity of 196.5 mg/g for the elimination of Cr(VI) in wastewater. There were four stages in developing the porous structure of activated carbon by the joint effects of molten carbonates and steam as the temperature rising. The activated carbon had abundant micropores inside the macropore structure at temperatures ranging from 700 °C to 750 °C. Molten carbonates promoted the formation of mesopores and macropores and reduced the reaction temperature as a catalyst and heat transfer medium, while steam promoted micropore generation by water-gas shift reactions. A recycling study indicated that the Cr(VI) adsorption capacity of the activated carbon generated after five recycling cycles of molten carbonates was still reached 195 mg/g.
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
高影响因子
Petroleum Science
·
2024
·
IF 6
Wei-Peng Wu,Min Yang,Dong-Chen Ma,Ji-Rui Hou,Tuo Liang,Ming Qu,Tao Tan,Biao Yang,Guo-Rui Ma
In-depth profile control is a crucial technique employed to enhance oil recovery in fractured-vuggy carbonate reservoirs. However, it is a challenge to achieve in-depth profile control. In this paper, two types of organic gel systems, namely s-MPG and MSRG, tailored for fractured-vuggy reservoirs with 140 °C and 22 × 10 4 mg/L have been developed. FTIR was used to analyze the functional groups of s-MPG and MSRG. Additionally, the quality retention rates of s-MPG and MSRG were assessed using TG-DSC, yielding results of 92.85% and 92.65%, respectively. The dilution rates of s-MPG and MSRG are found to be 18.69% and 26.69%, respectively, demonstrating excellent compatibility and adaptability. The enhancement performance depends on the synergistic effect that the anti-dilution s-MPG effectively separates bottom water, while high-strength MSRG separates the oil layer. Moreover, the EOR performances of s-MPG synergy with MSRG in various types of fractured-vuggy carbonate models were also evaluated. The highest oil recovery of 12% is achieved in fracture network model. Laboratory results indicate that the synergistic combination of s-MPG and MSRG for water plugging in fractured-vuggy carbonate reservoirs results in a more effective enhancement of oil recovery compared to using a single gel system for plugging. Finally, the s-MPG synergy with MSRG has been applied in actual fractured-vuggy carbonate reservoirs. As expected, the water cut of typical well is reduced from 100% to 30% and the increased oil production is 1142 t totally. Therefore, this study presents a novel approach to achieving in-depth profile control by leveraging the synergistic effect of s-MPG with MSRG in fractured-vuggy carbonate reservoirs.
研究领域:
石油工程
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jiawei Nie,Xiaoqian Wu,Jingjiang Wei,Yidi Li,Hao Xie,Weimin Wang,Hao Wang,Hang Ping,Bin Li,Zhengyi Fu
The exoskeleton of arthropods exhibits a Bouligand structure, composed of a chitin matrix and calcium carbonate crystals, which confer exceptional mechanical properties. While many studies focus on the relationship between structure and performance, few investigate the mineral growth process within the Bouligand matrix. Here, chiral chitin films are prepared through evaporation-induced self-assembly of chitin nanowhiskers, and subsequently incubated in SrCO3 mineralizing solution. Initially, precursors deposit on the film surface and transform into mineralized points, which then radially expand outward along the surface and propagate inward until coalescing into a continuous mineral layer. The growth rate of these mineralized points is significantly enhanced by increasing the reaction temperature; at 60 °C, the growth rate is 13 times faster (650.4 μm2/min) compared to that at 25 °C (49.7 μm2/min). Finally, SrCO3/chitin composite bulks are fabricated by stacking and hot-pressing multiple mineralized chitin films, adhered using sodium alginate (SA) solution through spin coating. The resulting SrCO3/chitin@SA composites exhibit a bending strength of 64.2 MPa, representing a 27% increase over pure chitin bulk and a 105% increase over pure SrCO3 bulk. Our work provides a strategy for low-temperature fabrication of high-performance artificial composites.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
·
2022
·
IF 4.52
Rui Zhang,Zhigang Zhao,Mingshuai Li,Liang Luo,Shihui Wang,Kun Guo,Wei Xu
Aquatic water with carbonate alkalinity presents a survival challenge to aquatic animals. As an economically important crab, large quantities of Eriocheir sinensis are cultured in carbonate-type saline-alkali ponds, while the toxic effect on E. sinensis from carbonate alkalinity is still unclear. In this study, untargeted liquid chromatography-mass spectrometry metabolomics was performed to investigate the metabolic change caused by culture alkalinity, and confirmed distinct physiological response under gradient alkalinities. There were 39 differential metabolites obtained in the low-alkalinity group (4.35 mmol/L) versus control group, and “arachidonic acid metabolism” was enriched as a core response pathway. 93 differential metabolites were identified in the high-alkalinity group (17.43 mmol/L) versus control group, and a complex response net was manifested through integrated analysis, building by “steroid hormone biosynthesis”, “phenylalanine, tyrosine and tryptophan biosynthesis”, “phosphonate and phosphinate metabolism”, “phenylalanine metabolism”, “mineral absorption”, “purine metabolism” and “carbon metabolism”. This indicated the mobilization of energy reserves and the suppression of protein and amino acid catabolism were manifested in E. sinensis gills to defense high alkalinity stress. In addition, the persistently regulation of key metabolites under various alkalinity, including diuretic compound “spironolactone” and the antiphlogistic compound “LXB 4 ”, suggested anti-inflammatory action and excretion regulation were initiated to defend the stress.
研究领域:
水产养殖学
·
环境毒理学
·
代谢组学
✓ 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）