CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Boran Wu,Lianghu Su,Xiaohu Dai,Xiaoli Chai
Nanosized CaO 2 was first synthesized using montmorillonite clay layers as templates for combining the positive effects of filtration aid and peroxidation on the dewatering of waste-activated sludge (WAS). Exchangeable Ca 2+ compensating for negative charges of montmorillonite reacted with the added H 2 O 2 , affording nano CaO 2 on the surface or in the interlayer regions of montmorillonite (montmorillonite-supported nano CaO 2 , MMT-nano CaO 2 ). The catalytic capacity of montmorillonite for generating OH from nano CaO 2 was verified by electron paramagnetic resonance (EPR), therefore, the radical oxidation induced by MMT-nano CaO 2 can destruct the floc structure of WAS with the omission of Fe(II), the conventionally used catalyst for Fenton reaction. As a result, the reduction in specific resistance of filtration (SRF) by 62.2% was achieved with the MMT-nano CaO 2 dosage of 100 mg/g dry solid (DS) and the weakly acidic pH of 5. OH led to the reduction of hydrophilic protein in extracellular polymeric substances (EPS), and the swelling behavior of montmorillonite contributed to the formation of a porous structure as draining medium for water withdrawing. The above factors were the dominant mechanisms for enhancing dewatering performance.
研究领域:
环境科学
·
污水处理
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DOI
高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Juan Tang,Hui Jia,Situ Mu,Fei Gao,Qingwen Qin,Jie Wang
The polymer coagulant aid can effectively enhance the coagulation-ultrafiltration (C-UF) process for the purification of drinking water . However, when coagulant aid entered the filtration, it may also cause serious membrane fouling as polymer. In-situ Raman spectroscopy and electrochemical impedance spectroscopy(EIS) were applied to monitor the effects of coagulant aids on the membrane. The causes of fouling were assisted discussed through stage cleaning of the membrane. The equivalent circuit fitting was performed on the EIS data and the Raman spectral data were statistically analyzed after peak fitting. EIS and the cluster analysis of Raman spectroscopy provided an earlier feedback on membrane fouling layers compared to flux. The cause of membrane fouling was explained via variation of characteristic functional groups obtained by Raman spectroscopy. When the molecular weight of the coagulant aid was 160 times,80 times and 16 times larger than the MWCO of the UF membrane, the equivalent circuit obtained by fitting the EIS of the UF system satisfied Rs + c(QpRp), Rs(QcRc)(QpRp) and Rs(Qt(Rc(QpRp))) respectively. Partial correlation analysis showed that the corresponding factors causing irreversible fouling of membrane were humic acid(HA), HA and coagulant aids, coagulant aids. Combined with the mean roughness (Ra) of membrane, the coagulant aid performed differently in the cleaning of contaminated membrane and also affected the cleaning of HA.
研究领域:
环境科学
·
分析化学
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DOI
PubMed
高影响因子
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
·
2020
·Vol. 235
·期 4
·451-466
·
IF 2.03
Yuli Xue,Yan Zhang,Xiaoling Tan,Wenqing Li,Zhongshu Li,Shaonan Xu,Peng Zhang,Jian Wang,Peiping Zhang,Shiding Miao
It is of importance to reclaim single-salt of potash from Li + -type brines of low concentration. In this work the potassium salts KHCO 3 was efficiently separated from the lithium carbonate-type brines with the aid of CO 2 carbonation. The phase field was provided in which the precipitation of KHCO 3 occurs and single-salt of potassium can be obtained. The low concentration of [Li + ] was also successfully concentrated to a high level (8.1 g/L), and this concentration can be used as sources for Li + -salts production using pre-developed strategies, which looks forward wider applications of the lithium resources of natural brine. This state-of-art was traced via isotherm evaporation on the quaternary system of Li + –K + –CO 3 2− –H 2 O at 298.15 K in which the carbonation steps were performed by CO 2 . Metastable phase diagram was found to consist of three invariant points, seven univariant curves, and four crystallization fields corresponding to Li 2 CO 3 , KHCO 3 , potassium carbonate sesquihydrate (K 2 CO 3 ⋅ 3/2H 2 O), and a potassium carbonate and potassium bicarbonate double salt (K 2 CO 3 ⋅ 2 KHCO 3 ⋅ 1.5H 2 O). There was no crystallization field corresponding to LiHCO 3 . The pH-composition diagram and density-composition diagram were also plotted. This work was carried out in aim of extracting/separating single salts of alkali metals from carbonate-type brines of west China.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
ELECTROANALYSIS
·
2018
·Vol. 30
·期 5
·842-851
·
IF 2.851
Meiling Wang,Mingzhu Cui,Weifeng Liu,Xuguang Liu,Bingshe Xu
Here, a facile reduction approach for synthesis of β-cyclodextrin functionalized reduced graphite oxide with the aid of ionic liquid (βCD/IRGO) was reported. This strategy relies on the simple mixing of pre-pared aqueous βCD/GO with ionic liquid (IL) at high temperatures, which can bring about a well dispersed βCD/RGO in the utilized IL (βCD/IRGO) with a synchronous evaporation of water. The as-prepared βCD/IRGO product can be stably re-dispersed in water (up to 1.0 mg/mL) after washed and dried. And the presented βCD/IRGO composites possess high supramolecular recognition capability and good conductivity for realizing enhanced electrochemical response towards simultaneous detection of guanine and adenine compared with other βCD/carbon (RGO or carbon nanotube) based composites. In the presence of one of analysts, the linear response ranges is 0.03–10.0 μM for guanine and 0.02–7.0 μM for adenine, respectively, with detection limit of 0.01 μM for both guanine and adenine (S/N=3). This ease of making the βCD/IRGO composite will open up possibilities of its diversifier applications.
研究领域:
材料科学
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电化学分析
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF BACTERIOLOGY
·
2022
·
IF 3.476
Greater Kayode Oyejobi,Dongyan Xiong,Mengjuan Shi,Xiaoxu Zhang,Hang Yang,Heng Xue,Faith Ogolla,Hongping Wei
With the increasing morbidity and mortality rates associated with multidrug-resistant bacteria, interest in bacteriophage therapy has been revived. However, bacterial resistance to phage infection threatens the usefulness of phage therapy, especially its inclusion in modern medicine. Multidrug-resistant Acinetobacter baumannii is a top-priority pathogen requiring urgent intervention and new therapeutic approaches, such as phage therapy. Here, we experimentally adapted A. baumannii WHG40004 to its lytic phage P21 and thereafter isolated a phage-resistant bacterial mutant, named Ev5-WHG. We then aimed to identify potential agents to aid phage killing of Ev5-WHG by analyzing its genome and that of the wild-type strain. The enriched Gene Ontology (GO) analysis based on genetic alterations in minor alleles and mutations showed that pathways such as zinc ion transport and cell membrane synthesis could play certain roles in phage resistance. Remarkably, the combination of zinc acetate and P21 showed increased bactericidal effect on Ev5-WHG. Significantly also, we showed that P21 completely prevented the growth of wild-type WHG40004 in the presence of antibiotics (meropenem and imipenem). The results from this study indicate that the analysis of phage resistance signatures during adaptation of bacteria to a lytic phage can inform the choice of agents to work cooperatively with phage to limit and/or reverse resistance. This approach could be important for guiding future successful phage therapy.IMPORTANCE Bacteriophages have proven very useful as alternative therapeutic agents in combating multidrug-resistant bacterial infections; however, bacterial resistance to phages threatens their use. In this study, we showed a new strategy of leveraging genetic signatures that accompany phage resistance in bacteria to predict agents that can be used with lytic phages to combat multidrug-resistant Acinetobacter baumannii. Significantly, this approach was helpful in suggesting the use of zinc acetate to reduce resistance in phage-resistant bacteria, as well as the use of phage with antibiotics meropenem and imipenem to prevent resistance in a wild-type strain of multidrug-resistant A. baumannii. The approach of this study will be helpful for improving the outcome of phage therapy and in overcoming antimicrobial resistance.
研究领域:
微生物学
·
基因组学
·
抗菌素耐药性
·
噬菌体疗法
·
细菌遗传学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Hengyang Mao,Hengqi Shi,Zhijie Zhang,Shouyong Zhou,Minghui Qiu,Mingmin Jia,Meisheng Li,Yijiang Zhao,Shanshan Xia,Zhentao Wu
Ceramic membranes have drawn attention in oil-in-water (O/W) treatment due to natural hydrophilicity and excellent chemical stability, however their application was restricted by high cost. In this work, a cost-effective Al 2 O 3 -based ceramic support was prepared at sintering temperature of 1500 °C with low-cost mixed-dimensional attapulgite (MDATP) as aid. The composite support with addition of 10 wt% MDATP and 3 wt% powdered carbon possessed an average pore size of 3 µm, bending strength of 63.7 MPa, pure water permeability of 1.32 × 10 4 L·m −2 ·h −1 ·bar −1 . Mullite was formed due to the reaction between Al 2 O 3 and SiO 2 in MDATP during sintering, which played a key role in preparing support with corrosive resistance performance. Then, a superwetting microfiltration (MF) membrane with pore size of 0.18 µm and permeability of 1470 L·m −2 ·h −1 ·bar −1 was obtained by coating ATP nanofiber on the Al 2 O 3 -MDATP support with sintering temperature of 600 °C. The molecular dynamics results showed that the ATP can repel oil fouling with interaction energy of − 872 Kcal·mol −1 . The excellent O/W emulsion separation efficiency of the MF membrane further demonstrated the feasibility of ATP and its by-products in decreasing membrane cost and improving performance.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 14
·e2213130120
·
IF 11.1
Honghuai Sun,Qingming Song,Zhenming Xu
The value of considerable residual energy in waste Li-ion batteries (WLIBs) is always neglected. At present, “this energy” is always wasted during the discharge process of WLIBs. However, if this energy could be reused, it would not only save a lot of energy but also avoid the discharge step of recycling of WLIBs. Unfortunately, the instability of WLIBs potential is a challenge to efficient utilization of this residual energy. Here, we propose a method that could regulate the cathode potential and current of the battery by simply adjusting the solution pH to utilize 35.08%, 88.4%, and 84.7% of the residual energy for removing heavy metal ions from wastewater, removing Cr (VI) from wastewater, and recovering copper from the solution, respectively. By taking advantage of the high internal resistance R of WLIBs and the sudden change of battery current I caused by iron passivation on the positive electrode of the battery, this method could induce the response of overvoltage η (η = IR) inside the battery at different pH levels to regulate the cathode potential µ of the battery to the three intervals. The potential ranges of the battery cathode corresponding to pH < 3.4, pH ≈ 3.4, and pH > 4 were µ > −0.47V, −0.47V < µ < −0.82V, and µ < −0.82V, respectively. This study provides a promising way and theoretical basis for the development of technologies for reusing residual energy in WLIBs.
研究领域:
环境科学
·
能源工程
·
废物管理
·
电化学
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产品关联
DOI
PubMed
高影响因子
KEY ENGINEERING MATERIALS
·
2014
·
IF 0
Xin Feng Zhu,Jue Feng,Jun Wu Zhu,Bin Li,Qin Xu
Simultaneous determination of Pb2+ and Co2+ without separation has been successfully achieved by a bicolor quantumn dots mixture. This method takes advantage of the different degrees of the fluorescence quenching effects of Pb2+ and Co2+ to the bio-color quantum dots. Chemometrical approaches were applied to assist the discrimination and detection process. The construction of the multivariate calibration models, based on partial least squares (PLS), orthogonal projections to latent structures least squares (O-PLS) and kenel based orthogonal projections to latent structures (K-OPLS), allowed the simultaneous determination of Pb2+ (in the concentration range of 0-120 mM) and Co2+ (0-300 mM). The optimal number of factors in PLS and the optimal number of orthogonal components in O-PLS and K-OPLS were carefully selected. A comparison of prediction performances between these results was performed by relative prediction errors, square of the correlation coefficient and root mean squares error of prediction.
研究领域:
分析化学
·
生物医学工程
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DOI
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 8
·1-13
·
IF 3.097
Cheng Xiao-Han,Wang Ke,Cheng Nian-Qi,Mi Si-Yu,Sun Liang-Shuang,Yeh Jen-Taut
The expansion ratio, resilience rate, moisture-proof, complex dynamic viscosity and crystallization rate for scCO 2 -aid glutaraldehyde modified thermoplastic starch (SC a TSGA 1.6 ) foams were substantially improved by further modification with sodium hexametaphosphate (SHP) and/or nano-silica (nano-SiO 2 ) particles during their scCO 2 -assisted foaming processes. These properties of SHP modified SC a TSGA 1.6 (SC a TSGA 1.6 SHP b and SC 11 TSGA 1.6 SHP 4 SiO 2 c ) foams were further improved with increasing scCO 2 -pressures during their scCO 2 -assisted foaming processes. Extremely high expansion ratio of ~ 65 and high resilience rate of 77% of the most appropriate SC 11 TSGA 1.6 SHP 4 SiO 2 0.5 foam were originally prepared using scCO 2 -assisted foaming processes. The significantly enhanced reliance rate found for SC a TSGA 1.6 SHP b and SC 11 TSGA 1.6 SHP 4 SiO 2 c foams is attributed to the better resilience of the smaller cell structures. Moreover, reaction of phosphate groups of SHP with the moisture-sensitive O–H groups of starch did occur favorably, and substantially improved the moisture-proof and complex dynamic viscosity (or melt strength) during the scCO 2 -assisted modification processing of SC a TSGA 1.6 SHP b and SC 11 TSGA 1.6 SHP 4 SiO 2 c . Thermal analyses revealed that crystallization rates and crystallization onset temperatures for SC 11 TSGA 1.6 SHP 4 SiO 2 c were substantially improved by addition of nano-SiO 2 particles. This substantial increase in melt strength, higher dissolved CO 2 concentrations at larger scCO 2 -pressures and/or higher crystallization rates for SC a TSGA 1.6 SHP b and/or SC 11 TSGA 1.6 SHP 4 SiO 2 c are expected to considerably enhance their nucleation rate and stability of cell structures during their scCO 2 -aid foaming processes. Consequently, higher expansion ratio, cell density and better reliance rate was found after the scCO 2 -aid foaming processes of SC a TSGA 1.6 SHP b and SC 11 TSGA 1.6 SHP 4 SiO 2 c foams.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Journal of Nanomaterials
·
2018
·Vol. 2018
·期 1
·1634814
·
IF 2.207
Lianbing Zhong,Guihong Geng,Yujin Wang,Feng Ye,Limeng Liu
A fully dense TaC ceramic was prepared by hot pressing using 10 mol% ZrC plus 5 mol% Cu as a sintering aid. Formation of (Ta, Zr)C solid solution (ss) by reaction between TaC and ZrC facilitated densification. Addition of Cu refined the microstructure and consequently improved flexural strength of the TaC ceramics. TEM investigation found ubiquitous precipitation of nanocrystallites at multigrain conjunctions. The nanocrystallites were (Ta, Zr)C solid solution with uniform dispersion in an oxygen-rich glassy matrix. Although formation of nanoprecipitates may not much affect the mechanical properties of the TaC ceramic, the structure suggested a new type of nanoceramic worth further research.
研究领域:
材料科学
·
陶瓷学
·
固态化学
·
显微结构分析
·
复合材料
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Langrun Song,Jun Nan,Yunyun Cao,Hui Zhang,Xiaoyue Zhang,Zhencheng Ge,Wenxing Jin,Ying Wang,Meng Chen
Ultra-low-pressure ceramic microfiltration (ULPCM) is fundamentally constrained by the permeability-selectivity trade-off: the accumulation of compact cake layers increases hydraulic resistance, whereas the intrinsic large pore size of microfiltration membranes limits the rejection of trace micropollutants. In this study, a tri-functional quaternary ammonium silane (AC) was introduced during polyaluminum chloride (PACl) pre-coagulation to regulate floc architecture and engineer the structure of the coagulation-derived cake layer. During 360 h (15 d) of continuous operation in both synthetic surface water and actual surface water, the AC-integrated system achieved a stable normalized flux (J/J 0 = 0.38-0.40) and exceptional PFOA sequestration (>93.71%), significantly outperforming conventional systems. Molecular dynamics (MD) simulations and spectroscopic analyses (XPS/FT-IR) elucidated that the C 18 alkyl chains and quaternary ammonium groups dictate PFOA capture through synergistic hydrophobic and electrostatic interactions, while hydrophilic silanol groups enhance dissolved organic carbon (DOC) removal via hydrogen bonding. At the interfacial level, XDLVO theory and dynamic light scattering (DLS) quantification revealed that AC effectively regulates the thermodynamics of floc adhesion, promoting the assembly of a highly branched, low-fractal-dimension (D f ) scaffold. Morphology measurements confirmed that the engineered cake layer maintained a high porosity (up to 62.79%) with a pore size distribution dominated by micro-channels (< 0.5 μm), which enhanced the water permeability of the cake layer and its retention capacity for foulants. Integrated fouling analysis using Hermia, Tansel, and saturation decay models, together with statistical evaluation, demonstrated that floc size, cake layer porosity, pore size distribution, and AC-induced hydrophobic interactions played key roles in mitigating membrane fouling and enhancing contaminant retention. These findings highlight that regulating floc architecture via amphiphilic coagulant aids provides an effective strategy for engineering cake layer microstructure and mitigating membrane fouling in low-pressure microfiltration systems.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Zhao-Mu Zhang,Jia-Hong Li,Yan-Neng Liang,Yuan Gao,Cheng-Xin Li
ScSZ is one of the traditional electrolyte candidates for solid oxide fuel cells (SOFCs) due to its excellent ionic conductivity. Nevertheless, its complex phase structure and high sintering temperature hinder further development. Herein, the effects of Yb 2 O 3 and Al 2 O 3 doping on conductivity and sintering ability as well as the long-term stability in ScSZ electrolyte are studied and discussed in detail. XRD and EIS tests revealed that the ZrO 2 electrolyte stabilized by 1 mol% Yb 2 O 3 and 10 mol% Sc 2 O 3 achieved a stable phase structure and high conductivity. Subsequently, the addition of 0.1 mol% Al 2 O 3 sintering aid reduced the densification temperature by more than 100 °C, achieving a density of over 96 % without significant decrease in ionic conductivity, with values of 0.12 S cm −1 in air at 750 °C. Long term stability test reveals that the ScSZ electrolyte doped with Yb 2 O 3 and Al 2 O 3 maintains a stable phase structure and exhibits no significant degradation in electrical performance after being held at 800 °C for 1080 h. In conclusion, the Yb 2 O 3 doped ZrO 2 electrolyte with 0.1 mol% Al 2 O 3 sintering aids exhibits a potential candidate material used in SOFCs.
研究领域:
材料科学
·
能源技术
·
固态离子学
·
燃料电池
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）