JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 161
·期 5
·
IF 3.1
Li Xiaoping,Ma Lijing,Zhou Yu,Lu Xinlong,Jing Li,Jing Dengwei
Regarding the rheological properties of fluids, certain nanoparticles can markedly modify the rheological behavior of low surface tension solutions by interacting with surfactant molecules. In this work, a low surface tension fluid with cetyltrimethylammonium chloride was prepared, and the silica nanoparticles were uniformly dispersed into it by ultrasonic dispersion. By adjusting the size, shape, and concentration of nanoparticles, the fluid behavior can be changed from Newtonian to non-Newtonian with finely tuned viscosity and characterized by a shear-thinning rheological behavior. In addition, this work explored how variations in environmental temperature and solution pH affect the rheological responses of the low surface tension suspension system. The experimental findings revealed that increasing the temperature substantially decreases the system’s viscosity and induces a shear-thickening behavior. It is particularly significant that, under extreme pH conditions (either strongly acidic or alkaline), the viscosity of the nanoparticle suspensions was markedly enhanced at a particle concentration of 10 000 ppm. This interesting result coincided with a notable reduction in the zeta potential and an increase in the average particle size, suggesting an intensified aggregation of particles within the suspension system. A mechanism detailing the interaction between silica nanoparticles and surfactant micelles was proposed. This work indicates that the incorporation of nanoparticles into surfactant solutions offers a powerful approach to modulating fluid rheology across various conditions.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Mengya Liu,Lulu Lu,Zhiwei Chen,Bin Wang,Yanxiang Li,Qiang Zhang,Usman Farooq,Zhichong Qi
To date, there is still very little knowledge about the combined effects of typical biosurfactants and solution pH values on iron oxide colloid-mediated transport of sulfamerazine (SMZ, a typical sulfonamide antibiotic) in saturated porous media . Herein, the influences of rhamnolipid (a common biosurfactant in the environment) on SMZ mobility in the absence or presence of ferrihydrite (a model iron oxide) colloids in saturated quartz sand were explored. Generally, the rhamnolipid suppressed the transport of SMZ without ferrihydrite colloids owing to the bridging effect of this biosurfactant (i.e., rhamnolipid served as a bridging agent between SMZ and sand). Moreover, ferrihydrite colloids also inhibited SMZ mobility due to the deposition of colloid-associated SMZ. Surprisingly, the presence of rhamnolipid significantly influenced ferrihydrite colloid-mediated transport of SMZ, and this effect was highly dependent on the solution pH. Concretely, rhamnolipid enhanced the inhibitory effects of ferrihydrite colloids on SMZ transport at pH 5.0 because of the increased SMZ retention on the deposited colloids via the bridging effect of biosurfactant. At pH 7.0, the transport-inhibition effects of colloids were weakened by adding rhamnolipid, which was due to the colloid-associated SMZ transport and the promoting electrostatic repulsion between the free SMZ and sand/ the deposited colloids. Surprisingly, ferrihydrite colloids facilitated SMZ transport in the addition of rhamnolipid at pH 9.0. This phenomenon stemmed from the enhanced free SMZ mobility, the colloid-assisted mobility of SMZ, and the competitive deposition between SMZ – species and negatively charged colloids . Moreover, the two-site non-equilibrium model was performed to help interpret the controlling mechanisms for the synergistic effects of rhamnolipid and solution pH on colloid-mediated transport of SMZ. The outcomes of this study offer valuable knowledge about the functions of widespread biosurfactants in the environmental consequences of antibiotics in subsurface systems with iron oxide colloids.
研究领域:
环境科学
·
微生物学
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DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 8
·989-999
·
IF 2.4
Hu Tao,Xu Weichuan,Li Dong,Wang Song,Wang Yuxiang,Wu Caijin,Tan Liqiang
Extensive use of Al 2 O 3 nanoparticles in consumer and industrial products has led to concerns about their potential environmental impacts in the recent years. In most studies concerning Al 2 O 3 aggregation and disaggregation, more was to consider the single factor that influences their environmental behaviors. Understanding the combined abiotic factors that influence the fate, transport, and stability of nanoparticles in a complex aquatic system has become extremely important. Here, we reported and analyzed the major abiotic factors such as typical solution pH, electrolyte cations in different valences (Na + and Ca 2+ ), and the presence of humic acid (HA) that influence the stability, aggregation, and disaggregation behaviors of Al 2 O 3 nanoparticles in a complex aquatic system. Dynamic light scattering technique combined with fluorescence spectroscopic analysis was used to explore the aggregation mechanisms. Experimental results indicated that Al 2 O 3 nanoparticle stability was mainly controlled by the steric hindrance, van der Walls, and electrostatic interactions between HA and Al 2 O 3 nanoparticles. Aggregation kinetics and attachment efficiency studies induced by the addition of Na + and Ca 2+ cations confirmed that divalent electrolytes could reduce the large energy barrier between the charged colloidal particles more efficiently, and induce a more aggressive aggregation of the particles. Additionally, the bridging effect of HA with Ca 2+ was also an important mechanism for the aggregation enhancement, which had been confirmed by the fluorescence excitation-emission matrix (EEM) spectra analysis. These findings are useful in understanding the environmental challenges of inorganic colloidal particles in natural environments.
研究领域:
环境科学
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纳米技术
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Xiaoying Jin,Lu Yang,Heng Li,Zhiqiang Chen,Zuliang Chen
Despite the oxidation mechanism of antimonite (Sb(Ⅲ)) by biosynthesized iron nanoparticles (Fe NPs) has been reported, the impact of coexisting components in acid mine drainage (AMD) on the Sb(III) oxidation by Fe NPs is unknown. Herein, how the coexisting components in AMD affect Sb(Ⅲ) oxidation by Fe NPs was investigated. Firstly, Fe NPs achieved complete oxidation of Sb(Ⅲ) (100%), while only 65.0% of Sb(Ⅲ) was oxidized when As(Ⅲ) was added, due to competitive oxidation between As(Ⅲ) and Sb(Ⅲ), which was verified by characterization analysis. Secondly, the decline in solution pH improved Sb(Ⅲ) oxidation from 69.5% (pH 4) to 100% (pH 2), which could be attributed to the rise of Fe 3+ in solution promoting the electron transfer between Sb(Ⅲ) and Fe NPs. Thirdly, the oxidation efficiencies of Sb(Ⅲ) fell by 14.9 and 44.2% following the addition of oxalic and citric acid , respectively, resulting from the fact that these two acids reduced the redox potential of Fe NPs, thereby inhibiting Sb(Ⅲ) oxidation by Fe NPs. Finally, the interference effect of coexisting ions was studied, where PO 4 3− significantly reduced Sb(Ⅲ) oxidation efficiency due to the occupation of the surface-active sites on Fe NPs. Overall, this study has significant implications for the prevention of Sb contamination in AMD.
研究领域:
环境化学
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纳米技术
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水处理
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DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2015
·
IF 2.467
Honghai Wu,Hanrui Xie,Guangping He,Yufeng Guan,Yanlin Zhang
Tetracycline frequently needs to be detected in the environment; therefore, iron-intercalated montmorillonite (Fe-Mt) was evaluated as a model adsorbent to evaluate tetracycline adsorption behavior . The Fe-Mt sample derived from Na + -montmorillonite (Mt) by the introduction of iron-(hydr)oxides was fully characterized using the techniques of XRD , FTIR , TEM, and SEM as well as N 2 -adsorption/desorption methods. The delaminated structure of Fe-Mt could cause remarkable increases in both the surface area and pore volume. Fe-Mt also showed remarkably distinct behavior from Mt for TC adsorption. The TC adsorption by Fe-Mt was found to be highly influenced by the pH as well as the types and concentrations of background electrolytes. The positive effect of anions on the TC adsorption by Fe-Mt at acidic pH values follows the following adsorption maximum order: PO 4 3 − > SO 4 2 − » NO 3 − > Cl − > ClO 4 − . The solution pH affects the TC adsorption, and the adsorption maximum occurs at a pH around 5.0. The Langmuir and Freundlich equations were shown to fit well to the TC adsorption isotherms on Fe-Mt, and the former equation was a better fit. These adsorption-related performances could be ascribed to Fe-Mt having formed characteristic bulk/surface/pore structures. The multiple potential coexisting efficient mechanisms or pathways responsible for the TC adsorption by Fe-Mt were finally proposed and discussed in comparison with Mt and ferrihydrite .
研究领域:
环境科学
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化学
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材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2016
·Vol. 23
·期 19
·19266-19280
·
IF 2.76
Yang Hui,Hu Yuanan,Cheng Hefa
Sorption of 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP), and 2,4,6-trichlorophenol (2,4,6-TCP) on a range of dealuminated zeolites were investigated to understand the mechanism of their sorption on microporous minerals, while the influence of common metal cations, solution pH, and humic acid was also studied. Sorption of chlorophenols was found to increase with the hydrophobicity of the sorbates and that of the microporous minerals, indicating the important role of hydrophobic interactions, while sorption was also stronger in the micropores of narrower sizes because of greater enhancement of the dispersion interactions. The presence of metal cations could enhance chlorophenol sorption due to the additional electrostatic attraction between metal cations exchanged into the mineral micropores and the chlorophenolates, and this effect was apparent on the mineral sorbent with a high density of surface cations (2.62 sites/nm 2 ) in its micropores. Under circum-neutral or acidic conditions, neutral chlorophenol molecules adsorbed into the hydrophobic micropores through displacing the “loosely bound” water molecules, while their sorption was negligible under moderately alkaline conditions due to electrostatic repulsion between the negatively charged zeolite framework and anionic chlorophenolates. The influence of humic acid on sorption of chlorophenols on dealuminated Y zeolites suggests that its molecules did not block the micropores but created a secondary sorption sites by forming a “coating layer” on the external surface of the zeolites. These mechanistic insights could help better understand the interactions of ionizable chlorophenols and metal cations in mineral micropores and guide the selection and design of reusable microporous mineral sorbents for sorptive removal of chlorophenols from aqueous stream.
研究领域:
环境科学
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化学工程
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水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Hanghang Zhao,Fengmin Song,Hongxu Zhou,Puhui Ji
Microplastics (MPs) discharged from wastewater treatment plants (WWTPs) have emerged as serious pollutants in aquatic environments. Herein, a new magnetic filter (MFA) was prepared using an acidification–magnetization method with fly ash (FA) as the base material. The filter specifically targeted the removal of 1-μm polystyrene microspheres (PSMPs) because of the challenges they pose in filtration processes. The findings demonstrated that MFA filter exhibited superior PSMPs removal efficiency, with increases of 219%, 250%, and 288% compared to FA at flow rates of 1, 3, and 5 mL min −1 , respectively. Scanning electron microscopy and other characterizations provided insights into the removal mechanisms of PSMPs using the MFA filter, which combined electrostatic attraction, π–electron conjugation, hydrogen bonding, and complexation. Environmental variables, such as solution pH, ionic strength, and dissolved organic matter, were identified as considerable influences in the removal process of PSMPs. The practical application confirmed that the MFA filter considerably promoted the elimination of MPs from the secondary treatment effluent of WWTPs without having any toxic effects on freshwater fish. Thus, this study provides a new approach to the resource utilization of FA, which would prominently promote its application prospects in MPs immobilization and removal from wastewater effluent.
研究领域:
环境科学
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水处理
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材料科学
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污染控制
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Lihong Wang,Jinkai Ruan,Fan Zhang,Zhiqiang Zhang,Tao Zhang
Dioxolanes, which are structural analogs to dioxane, are emerging persistent mobile organic contaminants. These compounds are frequently detected in water and wastewater, but their removal has been rarely addressed in the literature. This work systematically investigated the ozonation of two representative dioxolanes, i.e., 1,3-dioxolane (1,3-D) and 2-methyl-1,3-dioxolane (2-M-1,3-D). The degradation rates of two dioxolanes exhibited a positive correlation with both ozone dosage and solution pH increment. Specifically, direct ozone oxidation dominates the degradation of dioxolanes at slightly acidic pH, while hydroxyl radical ( • OH) becomes the primary oxidant under weak alkaline condition. The second-order reaction rate constants of ozone with 1,3-D and 2-M-1,3-D were determined to be 5.48 and 8.00 M −1 s −1 , respectively. The reaction rate constants with • OH were 9 orders of magnitude higher, reaching (3.75-8.18) × 10 9 and (2.65-5.78) × 10 9 M −1 s −1 for 1,3-D and 2-M-1,3-D, respectively. A kinetic model involving 112 reactions well simulated the degradation of 1,3-D and 2-M-1,3-D under various conditions accordingly. Eight transformation products were identified totally, and seven of them (i.e., formic acid, acetic acid, oxalic acid, formaldehyde, acetaldehyde, glyoxylic acid, and 1,2-ethanediol monoacetate) were quantified. The observed evolution of these identified degradation products concludes that the degradation of 1,3-D and 2-M-1,3-D during ozonation mainly involves H-abstraction, dimerization, ring opening, disproportionation, and hydrolysis. This work not only provides essential kinetic data of dioxolanes, but also sheds light on their potential transformation mechanisms and aquatic environment risks during ozonation process.
研究领域:
环境科学
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水处理
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化学工程
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毒理学
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Zheng-Wei Yang,Wen-Long Wang,Min-Yong Lee,Qian-Yuan Wu,Yun-Tao Guan
Synergistic effects of ozone (O 3 ) and peroxymonosulfate (PMS, HSO 5 − ) for isothiazolinone biocides degradation was studied. The synergistic ozonation process (O 3 /PMS) increased the efficiency of methyl-isothiazolinone (MIT) and chloro-methyl-isothiazolinone (CMIT) degradation to 91.0% and 81.8%, respectively, within 90 s at pH 7.0. This is 30.6% and 62.5% higher than the corresponding ozonation efficiency, respectively. Total radical formation value ( R ct, R ) for the O 3 /PMS process was 24.6 times that of ozonation alone. Calculated second-order rate constants for the reactions between isothiazolinone biocides and ( k SO4 -,MIT and k SO4 -,CMIT ) were 8.15 × 10 9 and 4.49 × 10 9 M −1 s −1 , respectively. Relative contributions of O 3 , hydroxyl radical ( OH) and oxidation to MIT and CMIT removal were estimated, which were 15%, 45%, and 40% for O 3 , OH and oxidation to MIT, and 1%, 67%, and 32% for O 3 , OH and oxidation to CMIT at pH 7.0, respectively. Factors influencing the O 3 /PMS process, namely the solution pH, chloride ions (Cl − ), and bicarbonate (HCO 3 − ), were evaluated. Increasing the solution pH markedly accelerated O 3 decay and OH and formation, thus weakening the relative contribution of O 3 oxidation while enhancing that of OH and . Cl − had a negligible effect on MIT and CMIT degradation. Under the dual effect of bicarbonate (HCO 3 − ) as inhibitor and promoter, low concentrations (1–2 mM) of bicarbonate weakly promoted MIT and CMIT degradation, while high concentrations (10–20 mM) induced strong inhibition. Lastly, oxidation performance of O 3 and O 3 /PMS processes for MIT and CMIT degradation in different water matrices was compared.
研究领域:
环境科学
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化学工程
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水处理
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 35
·53509-53521
·
IF 5.19
Peng Xiaoying,Zheng Jiahao,Wang Jinsong,Xiang Chao,Wang Rui
In this study, the potassium copper ferrocyanide-functionalized hollow mesoporous silica spheres was successfully prepared. SEM, FTIR, XRD, EDS, and XPS techniques were used to characterize the structure of materials before and after functionalization. The synthesized functionalized hollow mesoprous silica was applied to remove cesium from aqueous solution. The applicability of the adsorbent for the removal of cesium ions was assessed and the effective parameters such as solution pH, contacting time, initial Cs + concentration, and competitive ions effect were evaluated systematically under the batch mode. The experimental results showed that the adsorbent exhibited high Cs + selectivity even in the highly concentrated coexisting ions solution, which makes them to be used as potential adsorbents for the removal of cesium from nuclear wastewater or contaminated groundwater.
研究领域:
材料科学
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环境科学
·
核废料管理
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 48
·23112-23118
·
IF 3.925
Xiaoxun Liu,Jilin Zhang,Yunyun Lei,Zi Dai,Xiaoya Zhao,Guixia Liu
Metal–organic framework (MOF) materials have great potential for solving dye contamination problems due to their excellent organic dye adsorption properties. However, MOF adsorbents present a tremendous drawback of poor separability. Herein, core–shell Fe3O4@ZIF-8-PSS with abundant active sites and sensitive magnetic responses was synthesized in one step via simultaneously introducing imidazole ligands and poly(sodium-4-styrenesulfonate) (PSS) modifiers into the dispersion of Fe3O4 microspheres. These magnetic Fe3O4@ZIF-8-PSS microspheres can be magnetically separated and recovered in only 10 seconds. Moreover, the addition of PSS increases the active sites of Fe3O4@ZIF-8-PSS, which is more favorable for the adsorption of organic dyes. The maximum adsorption capacity for crystal violet (CV) can reach 382 mg g−1. The adsorption process was consistent with the Langmuir isotherm and pseudo-second-order kinetic models. The adsorption mechanism of Fe3O4@ZIF-8-PSS for CV is mainly attributed to electrostatic interactions and π–π interactions. The effects of solution pH and coexisting ions on the adsorption capacity were adequately discussed. These studies suggest that Fe3O4@ZIF-8-PSS not only has efficient adsorption properties but can also be easily separated by external magnetic fields after being used for organic dye wastewater treatment, which may endow it with considerable potential for wastewater treatment.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Zhaoyu Bai,Ruijun Zhang,Songxue Wang,Shanshan Gao,Jiayu Tian
Membrane fouling is a prevalent problem faced by all membrane-based applications, which is affected by membrane features, foulant properties and solution chemistry conditions. Here in this study, we explored the fouling behaviors induced by three typical organic matters (Humic acid (HA), Sodium alginate (SA) and Bovine Serum Albumin (BSA)) during the filtration process of two self-made ceramic hollow fiber MF membranes (denoted as Titania and Alumina, respectively), and compared with that of one commercial PVDF MF membrane. Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory was employed to investigate the interfacial energy between foulants and different membranes. The results indicated that the anti-fouling ability of the three membranes followed the order: Titania > Alumina > PVDF. Further, it was found that regardless of the membrane features, increase of solution pH improved the interfacial free energy and thus mitigating membrane fouling. The addition of Na + decreased the fouling tendency of HA and SA, but enhanced the fouling behavior by BSA, while Ca 2+ can enhance all the fouling tendency of HA/SA/BSA. Co-existence of different organic matters resulted in a more complex fouling variation, which can not be well described with XDLVO theory. Our research is expected to provide a fundamental reference for MF membrane selection in practical application.
研究领域:
环境工程
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膜科学
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水处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）