SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
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IF 9.8
Wangjun Lin,Linfeng Peng,Hui Li,Tangfu Xiao,Jianqiao Wang,Nana Wang,Xiangting Zhang,Hanmo Zhang
Fe(II)-induced phase transformations of secondary iron minerals have attracted considerable attention due to their influence on antimony (Sb) mobility. However, Fe(II)-induced natural multicomponent secondary iron mineral (nmSIM) transformations and the corresponding repartitioning of Sb on nmSIM under acidic conditions upon Fe(II) exposure have not been systematically examined. Herein, we investigated the effect of Fe(II) on nmSIM mineralogy and Sb mobility in Sb(V)-bearing nmSIM at pH 3.8 and 5.6 at various Fe(II) concentrations over 15 d. The Sb(V)-bearing nmSIM phase transformation occurred under both strongly and weakly acidic conditions without Fe(II) exposure, while the presence of Fe(II) significantly intensified the transformation, and substantial amounts of intermediary minerals, including jarosite , ferrihydrite , lepidocrocite and fougerite, formed during the initial reaction stage, especially at pH 5.6. X-ray diffraction (XRD) analyses confirmed that goethite and hematite were the primary final-stage transformation products of Sb(V)-bearing nmSIM, regardless of Fe(II) exposure. Throughout the Sb(V)-bearing nmSIM transformation at pH 3.8, Sb release was inversely related to the Fe(II) concentration in the initial stage, and after maximum release was achieved, Sb was gradually repartitioned onto the nmSIM. No Sb repartitioning occurred in the absence of Fe(II) at pH 5.6, but the introduction of Fe(II) suppressed Sb release and improved Sb repartitioning on nmSIM. This transformation was conducive to Sb reimmobilization on Sb(V)-bearing nmSIM due to the structural incorporation of Sb into the highly crystalline goethite and hematite generated by the Sb(V)-bearing nmSIM transformation, and no reduction of Sb(V) occurred. These results imply that Fe(II) can trigger mineralogical changes in Sb(V)-bearing nmSIM and have important impacts on Sb partitioning under acidic conditions. These new insights are essential for assessing the mobility and availability of Sb in acid mine drainage areas.
研究领域:
环境科学
·
矿物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2018
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IF 4.908
Hongping Quan,Langman Xing
A series of chemical products with characteristic groups in molecular structures were synthesized as novel flow improvers (FIs) for heavy asphaltenic crude oil. The rheological measurement results showed that the FI-5 could behave the better performance in improving fluidity of heavy oil than FI-2 due to the former could form stronger hydrogen bonds with asphaltene in oil, which was confirmed through Fourier transform infrared spectroscopy (FTIR) and energy of simulating studies. Furthermore, X-ray diffraction (XRD) analysis results demonstrated that two products altered asphaltene structure at different degree through hydrogen bonding interaction, and the aggregation-dispersion effect of FIs on asphaltene were respectively obtained through scanning electron microscope (SEM), which beneficially weakened the stable structure of asphaltene in the heavy crude oil system . Hence, the mechanisms were tried to propose that could explain the phenomenon in rheological measurement why FI-2 was not as good as FI-5 in improving fluidity of heavy oil. Results also indicated that the asphaltene content and aggregation structure in oils were vital parameters for its viscosity.
研究领域:
石油化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
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2022
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IF 11.072
Tong An,Yan Qin,Hao Cheng,Jianning Wu,Weihua Su,Guihua Meng,Hongxiao Wei,Chenhui Sun,Zhiyong Liu,Xuhong Guo
Phosphorus (P) is an essential nutrient widely used in crops. Phosphate fertilizers are easily adsorbed on the soil surface, resulting in poor migration to the roots of crops, and a large amount of nutrients cannot be absorbed and utilized, resulting in waste of resources and low bioavailability . To solve the problem of insufficient mobility of phosphate fertilizer, this work uses TiO 2 -WO 3 to catalyze the oxidation and pyrolysis of lignite to synthesize small molecular humic acid , and uses small molecular humic acid to coat commercial phosphate fertilizer (MAP) to obtain a new type of phosphate fertilizer (AMAP) with good fluidity. Water contact angle was determined from initially hydrophobic (132°) to hydrophilic (76°). Humic spectroscopic ratio (E 4 /E 6 ), H/C and molecular weight distributions confirmed the effectiveness of the TiO 2 -WO 3 catalyst and the successful modification of weathered lignite. The migration characteristics of phosphorus in the soil were studied by leaching migration experiments. The results showed that the effective phosphorus content of the new coated phosphate fertilizer (AMAP) in the soil exceeded that of the commercial phosphate fertilizer (MAP) at different vertical migration distances. After 21 d of incubation at the same fertilizer level, new coated phosphate fertilizer (AMAP) of phosphate fertilizer added with different products showed elevated levels of P. Migration data indicated that the migration distance of effective phosphorus approximated the long root distance of early corn, which benefitted crop growth. The pot experiment confirmed improved corn growth and improvement in the utilization rate of phosphorus fertilizer. All in all, activated lignite (AHA) can reduce or inhibit the fixation of phosphorus nutrients in the soil, and has obvious application value for improving the efficiency of phosphate fertilizers.
研究领域:
农业科学
·
土壤学
✓ 已验证
产品关联
DOI
高影响因子
Particuology
·
2024
·
IF 4.1
Ming Zhou
This work investigates the flow and agglomeration behaviors of battery grade Li 2 CO 3 powder and the influence of stearic acid surface modification. The degree of agglomeration is directly related to the uniformity of Li 2 CO 3 and its powder mixtures. According to the Chinese National Nonferrous Metal Industry Standard, battery grade Li 2 CO 3 powder has D 50 equal to 3–8 μm which belongs to a micron-sized superfine powder. Therefore, with the extension of storage time, the serious agglomeration phenomenon occurs due to the large specific surface area and rough and irregular powder particles. The Hausner ratio (HR) of the unmodified sample increases from 1.14 to 1.41, and the corresponding flowability is classified as good to poor. Instead, among samples with doping stearic acid, the optimum amount of it is 0.10 wt% which exhibits an extremely stable HR value from 1.14 to 1.16. Meanwhile, after 156 days, the repose angle (AR) obtained for samples without surface modification and using 0.10 wt% stearic acid are calculated to be 49° and 28°, respectively. Based on the values of HR and AR, the flowability of the unmodified sample is poor while the sample modified with 0.10 wt% of stearic acid still maintain excellent powder flow property. Moreover, The LiMn 2 O 4 cathode material synthesized from modified Li 2 CO 3 powder with a stearic acid content of 0.10 wt% exhibits good crystallinity and comparable electrochemical performance to that prepared by commercial Li 2 CO 3 . These results indicate that stearic acid has the potential to be an ideal modifier for battery grade Li 2 CO 3 powder that needs to be kept for a long time.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2021
·
IF 7.033
Yang Liu,Zhengnan Sun,Guolin Jing,Shuo Liu,Yihai Yang,Jianqi Xu
The alkali-catalyzed alcoholysis of polyethylene vinyl acetate (EVA) was used to obtain the product ethylene-vinyl alcohol copolymer (EVAL), and the grafting product poly(ethylene-vinyl alcohol)-graphene oxide (EVAL-GO) was prepared in the form of chemical grafting by utilization of the groups on the surface of GO and EVAL through the esterification reaction. The products were analyzed by Fourier transform infrared (FTIR), 1 H nuclear magnetic resonance (NMR) and Thermogravimetric (TG). The rheological properties of the oil sample and changes in the morphology of wax crystals were characterized by Advanced Hybrid Rheometer and polarized optical microscopy (POM) respectively. The degree of alcoholysis of EVAL reached 74.51%, and the grafting rate of EVAL-GO (0.5%) was 36.18%. Reduction of pour point and gel point of nanocomposite treated crude oil was 12 °C and 4 °C from undoped crude oil at the optimum additive concentration of 1000 mg/kg. Moreover, it decreased the viscosity and yield value of virgin crude oil by 99.5% and 78.3%, respectively. From the morphological analysis, it was indicated that EVAL-GO could make the wax crystals form sphere-like crystals, and the increased void space promoting more liquid oil to be released thus significantly improving the low-temperature fluidity of Daqing waxy crude oil.
研究领域:
石油工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
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2023
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IF 3.8
Hao Zhang,Haiqiang Yang,Zhengjun Chen,Fang Yuan,Qiang Yang,Bo Liu
The presence of dissolved salts in water inhibits bubble coalescence, facilitating the generation of microbubbles, while also maintaining a tangentially mobile air-water surface. In this study, we investigated the variation of bubble size and gas holdup with gas velocity in NaCl solutions using a rectangular bubble column and interpreted the experimental data using the one-dimensional drift-flux model. For the generated bubbles at the size between 0.4 mm and 1 mm, we found that the Moore model assumes mobile air-water surfaces, rather than the Schiller and Naumann model, should be used to describe the bubble terminal velocity. The latter model, which assumes an immobile air-water surface, has been used successfully to predict two-phase flow in surfactant solutions but would overestimate the gas holdup by almost 100 % for NaCl solutions. This finding emphasizes the crucial role of surface mobility in determining gas holdup. Thus, we propose the use of a one-dimensional drift-flux model, incorporating the Moore model to describe bubble terminal velocity, for microbubble systems with a mobile air-water interface.
研究领域:
化学工程
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
·
IF 3.8
Dongbo Wang,Xuan Zhou,Yanbo Liu,Mingyang Chen,Dandan Han,Junbo Gong
With the rise of research on functional sugar, we found that preparing crystalline powders into spherical crystals will significantly improve quality, stability, appearance, and texture. In this work, d-ribose (D-RIB) spherical crystal aggregates were prepared for the first time. And D-RIB spherical crystal aggregates with superior filterability, flowability, and tap density can be prepared in ethanol, 1-propanol, and isopropanol. Specifically, we used ethanol as an example to reveal the formation mechanism of D-RIB spherical crystal aggregates: solvent-induced crystal defects, which in turn trigger noncrystallographic branching and further spherulite growth. Finally, a comparison of the properties of the D-RIB spherical crystal aggregates with those of commercially available products is given, demonstrating the fabrication of D-RIB spherulites with better tap density and flowability by solvent-induced noncrystallographic branching. This will provide a new insight into the preparation of high-quality D-RIB crystals.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2020
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IF 6.306
Fanghui Fan,Pengyu Xiang,Liqing Zhao
Lactose is a common component found in many foods and dairy products. In this study, the vibrational signatures in the crystalline structure of α -, β -, and α -lactose monohydrate were calculated based on quantum chemistry calculation (QCC), whilst the vibrational spectra in freeze-dried lactose equilibrated at various a w and pre-humidified amorphous lactose (0.33 a w ) stored from 25 to 95 °C were determined by using Raman and FT-IR spectroscopies. The vibrational signatures of crystalline lactose were affected by the presence of water according to QCC results. Water plasticization, involving water insertion, exposure of H-bonding sites, and structure disruption, was accelerated by storage temperature based on Raman and FT-IR spectra analysis. Raman spectra indicated that the crystal formation of lactose was affected by a w and storage temperature. Moreover, the spectral changes assigned in OH group provided useful information for determining the critical a w or temperature when T g -related molecular mobility occurred in lactose-containing products.
研究领域:
食品科学
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物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
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2019
·
IF 2.886
Chenbo Ma,Jinjun Zhang,Kai Feng,Zixin Li,Chaohui Chen,Qian Huang,Yingda Lu
Electrical treatment is emerging as an efficient approach to improve the cold flowability of crude oils. In this work, waxy model oils under static state were electrically treated by an in-house apparatus. The influence of asphaltenes, the most aromatic of the heaviest components of crude oil, on the performance of electrical treatment was systematically examined for the first time. The presence of asphaltenes was found to significantly undermine the effectiveness of electrical treatment on waxy oils, and this negative influence became more pronounced at higher asphaltene contents. The effect of asphaltenes was largely independent on their aggregation state. Interestingly, although asphaltenes generally have a negative effect on electrical treatment of waxy oils, increasing polarity of asphaltenes alleviates this unfavorable effect. The results from microscopic analysis suggest that the less pronounced change in the size distribution of wax crystals might be one of the reasons for the unfavorable effects of asphaltenes on electrical treatment of waxy oils.
研究领域:
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Zhen Sang,Wenqian Zhang,Zhiyuan Zhou,Huakang Fu,Yeqiang Tan,Kunyan Sui,Yanzhi Xia
Alginate is a kind of marine-derived plant polysaccharide with useful properties including inherent flame-retardancy and biocompatibility, yet poor flowability and low processing efficiency induced by high viscosity impede its further industrial applications. In this study, PEG-substituted tertiary amines were adapted to functionalize alginate with different molecular weight via acid-base reaction to improve the flowability. Based on alginate with low molecular weight, alginate fluids exhibited excellent flowability at room temperature in the absence of solvent. For alginate with high molecular weight, gelatinous precipitated phase exhibited significant shear-thinning properties and higher solid content despite lack of solvent-free flowability, which was applied to wet-spinning. The alginate fibers exhibited increased tensile strength by 104% and elongation at break by 132% compared with conventional alginate fibers, and the spinning efficiency was significantly improved. The proposed strategy is expected to extend to highly efficient processing of other polysaccharides to obtain high-performance biomedical materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Bing He,Kailei Lu,Wenxin Du,Xiaolan Zhou,Xu Huang,Yanli Shi,Zhangyi Huang,Haomin Wang,Jianqi Qi,Tiecheng Lu
In this work, the mono-dispersed and high-flowable AlON spherical powders were obtained for the first time. Spherical pure AlON particles with a mean size of approximately 51.9 μm were prepared from the C/Al 2 O 3 mixture via spray drying technology followed by a calcined step at 1750 °C for 0.5 h. Compared with the irregular-shaped AlON powders obtained by the conventional route, the as-prepared spherical AlON powders present higher flowability and filling properties. The Carr index and Hausner ratio of these AlON powders are 73.5 and 1.13, respectively. This work provides a paradigm for obtaining highly flowing spherical ceramic powders, which is desirable for the preparation of complex-shaped AlON ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
FOOD MICROBIOLOGY
·
2025
·
IF 4.6
Ping Lu,Juan Xue,Aiying Shi,Xuemeng Ji
Cronobacter sakazakii is a notorious foodborne pathogen linked to severe infections in neonates, with powdered infant formula serving as a common transmission route due to its ability to survive under desiccated conditions. Understanding the molecular mechanisms underlying its desiccation resistance is crucial for developing effective control strategies. In this study, we employed comparative proteomics and hydropathy profiling to investigate putative core proteins potentially involved in desiccation resilience. Proteomic analysis of wild-type and 22 knockout strains identified 1,354 proteins, of which 156 were defined as putative core proteins due to stable abundance profiles. Among these, two uncharacterized proteins, ESA_03998 and ESA_01764 , exhibited strong hydrophilic properties and were predicted to be surface-associated based on signal peptide analysis. Gene knockout of ESA_03998 or ESA_01764 significantly reduced surface hydrophilicity and survival under prolonged desiccation in both PBS and milk powder matrices. Additionally, Laurdan-based membrane fluidity assays revealed increased membrane rigidification (ΔGP) in mutant strains, indicating that these proteins help preserve membrane hydration and dynamics under low-moisture conditions. These findings establish a novel link between hydrophilic putative core proteins and membrane-associated desiccation resistance in C. sakazakii , offering insights into its persistence in dry food environments and highlighting potential targets for mitigating contamination in powdered infant formula.
研究领域:
微生物学
·
分子生物学
·
食品科学
✓ 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）