CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Xuan Zhang,Chao Wei,Ying-Jie Hao,Zhi-Wei Yan,Xi Yan,Yan Chen,Xiao-Jing Guo,Wan-Zhong Lang
The bottlenecks of low separation efficiency and unsatisfactory structural stability restrain the advancement of superhydrophobic membranes in water-in-oil emulsions separation. In this work, a facile template-assisted strategy was proposed to construct the robust membranes by casting the polyvinylidene fluoride (PVDF) solution onto the hot stainless plate with the silicon dioxide (SiO 2 ) suspension sprayed as the template in advance. The underlying merits of SiO 2 incorporated for the construction of hierarchical structure characteristics and meanwhile served as the reaction sites for the follow-up fluorinated modification were demonstrated, in terms of developing highly-permeable membrane with super hydrophobicity. Correspondingly, the best performing membrane of M−300F shows the fluxes of 2351 ± 225 L·m −2 ·h −1 and 2752 ± 210 L·m −2 ·h −1 in the separation of simulated water-in-toluene and water-in-hexane emulsions, and meanwhile exhibits the water rejection of 98.9 ± 0.6 % and 99.1 ± 0.3 % respectively. Results reported in this work might demonstrate a new insight in constructing superhydrophobic membranes for practical water-in-oil emulsions separation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dongdong Ma,Xiangyi Zhang,Chenshan Dong,Huiyu Yang,Kaimin Deng,Mengyao Zhu,Ziwei Deng,Jingjing Huang,Shaojin Gu,Xin Liu,Bin Shang
Engineering the pore structure of evaporator to effectively integrate water and thermal management is critical for efficient solar-driven interfacial vapor generation. Here, inspired by the unique structure of Benincasa hispidas , a bioinspired pore-gradient aerogel was fabricated for the first time. Experiments and numerical simulations reveal that the unique anisotropic porous structure of aerogel, which consists of small-pores at top region and large-pores at bottom region, enabling it to maximize the heat gains from the sunlight and localize the generated heat while provide adequate water supply concurrently. Under solar illumination (1 kW m −2 ), the fabricated aerogel can achieve a high evaporation rate of 2.49 kg m −2 h −1 , and the calculated energy efficiency is approximately 96.3 %, which is comparable to most of state-of-the-art evaporators. Additionally, with this aerogel employed, effective purification toward various undrinkable water can be achieved. This work derives from nature, providing us a design blueprint to integrate water and thermal management in a bulky material, and it is expected to advance one step further toward the design and practical application of high-performance solar evaporators.
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高影响因子
DESALINATION
·
2023
·
IF 9.9
Jinsong He,Tingyan Deng,Linzhi He,Xiaochan An,K.G. Nadeeshani Nanayakkara,Fei Shen,Yanzong Zhang,Jianmei Zou,Li Zhao
From the view of sustainable development, the loose nanofiltration (LNF) membrane with high permeability and excellent separation of dye/salt mixture becomes more attractive for dye-containing wastewater. However, the previous LNF membranes inevitably suffered from the permeability-selectivity trade-off due to the inherent nature of polymer-based selective layer. This study reported a tannic acid (TA)-MoS 2 nanosheets (NSs) interlayered nanocomposite polyester (PE) LNF membrane (iLNF-3) that exhibited a remarkably enhanced water permeance of 55.8 LMH·bar −1 compared to the control LNF membrane of 27.3 LMH·bar −1 , and a higher separation selectivity of dye/salt (rejection rate: 99.6 % for congo red, 98.0 % for methyl blue, 5.6 % for Na 2 SO 4 , respectively). Furthermore, the iLNF-3 showed high ionic interference resistance, long-term stability, and superior antifouling performance. The enhanced permeance and dye/salt separation were mainly attributed to the introduction of a high-permeability TA-MoS 2 NSs interlayer . In particular, the permeability was improved due to the “gutter” effect and nanochannels and the formed thinner PE selective layer caused by TA-MoS 2 NSs interlayer. Notably, the selectivity was enhanced owing to the looser porous structure of PE layer resulting from the slow diffusion rate of aqueous monomer . This study can provide a foundational framework for the development of iLNF membranes for treating dye containing wastewater.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Sihui Tang,Yuhao Chen,Hongbin Zhang,Tengfang Zhang,Peijian Wang,Haixiang Sun
Dye effluent is regarded as one of the most hazardous industrial effluents. Although loose nanofiltration (NF) membranes have been considered as an effective alternative technique for treating dye effluent, their development is still constrained by subpar permeance, separation efficiency and anti-fouling performance. In this work, a novel loose polyamide (PA) NF membrane was designed employing a conventional interfacial polymerization process using piperazine-2-carboxylic acid (PIP-COOH) and trimesoyl chloride as aqueous and organic phase monomers, respectively. The presence of unique electron-absorbing carboxyl groups on the PIP-COOH monomer not only provided abundant negative charge on the membrane surface, but also greatly reduced the reactivity, diffusion rate and solubility in n-hexane of the aqueous monomer, allowing for the formation of a more relaxed and smoother active layer. The balanced combination of pore size screening and Donnan effect achieved precise separations with high permeability. Moreover, the interaction of the carboxyl groups with the backbone structure increased the free volume of the PA layer and improved permeability significantly. The PIP-COOH/TMC membrane prepared under the optimal conditions exhibited high water permeance of 598.1 L·m −2 ·h −1 ·MPa −1 , high reactive red rejection (99.3%) and low NaCl rejection (5.4%). Furthermore, the membrane possessed exceptional anti-fouling performance thanks to the ultra-smooth surface with crucial antifouling index flux recovery ratio as high as about 99%, which showed unexpected application possibilities. In conclusion, this study offers a potential novel membrane material for the development and application of loose NF membranes in the treatment of colored effluent.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xuewu Zhu,Zhongyue Sun,Jingtao Xu,Sisi Xu,Xinsheng Luo,Fengxun Tan,Xiaolong Lu,Daoji Wu,Heng Liang,Xiaoxiang Cheng
Poly(vinyl alcohol) (PVA)-based polyester loose nanofiltration (LNF) membranes present an ideal material for achieving dye/salt separation from dye/salt mixtures. Owing to the intrinsic features of the material, PVA with varying degrees of alcoholysis may exhibit different roles and functions, allowing for performance tailoring in PVA-based LNF membranes. In this work, we have demonstrated a facile approach for regulating the performance of polyester (PE) LNF membranes by tailoring the degree of alcoholysis. Stopped-flow mass spectrometry and various characterization techniques showed that an increase in the degree of alcoholysis accelerates reaction rates, increases reaction heat release, and boosts nanobubble formation during interfacial polymerization. The resulting LNF membrane featuring folds and a dense PE film demonstrated a permeance of 44.9 L m -2 h −1 bar −1 and a CR/Na 2 SO 4 selectivity of 240, as well as satisfactory stability, showing dye/salt separation performance superior to that of other LNF membranes. This work provides novel insights into tailoring high-performance LNF membranes for selective salt/dye separation.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Junlong Zhang,Jie Wei,Minchuan Xiahou,Zehao Sun,Ao Cao,Youxin Yuanfeng,Yanchun He,Shigeng Song
Novel In 2 S 3 @BiYWO 6 heterojunction photocatalysts were designed and synthesized by a simple two-step hydrothermal method, which exhibit extremely excellent photocatalytic activity for degrading the residual antibiotics in wastewater. Especially, In 2 S 3 @BiYWO 6 composite with mass ratio of 10:1 shows the highest photo-degradation efficiency towards Tetracycline Hydrochloride, which is about 2.46 and 7.55 times than that of pristine In 2 S 3 and BiYWO 6 , respectively. A direct Z-scheme charge transfer mechanism was demonstrated in these heterojunctions through the XPS analysis, radical species trapping experiments and fluorescence detection. Within the framework of this mechanism, the critical built-in electric field ( E i ) formed at the contact interface between In 2 S 3 and BiYWO 6 spatially separates reduction or oxidation sites and thus preserves the photogenerated carriers with stronger redox ability on reaction sites, which ultimately enhances the photocatalytic activity of the heterojunction catalysts. It is commendable that such Z-scheme heterostructures between In 2 S 3 and BiYWO 6 exist in a wide span of component ratios (from 5:1 to 30:1), which is beneficial for the environmental remediation applications. It is believed that this work provides new ideas for design and synthesis of novel Z-scheme heterojunction photocatalysts.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Bing-Xin Gu,Zhuang-zhuang Liu,Kai Zhang,Yan-Li Ji,Yong Zhou,Cong-Jie Gao
Organic solvent nanofiltration (OSN) as a high-efficient membrane separation technology has play an important role in chemical industrial separation, clean energy production, and high-value resources recycling, etc. Inspired by the asymmetric biological structure of Desert beetle, herein a novel kind of polymeric OSN membranes with asymmetric structure have been fabricated via fluorinated polymeric networks (FPNs) regulated interfacial polymerization. The FPNs were formed with m-phenylenediamine (MPD), dopamine (DA) and 1H,1H,2H,2H-Perfluorodecane-thiol (PFDT) via the Michael addition and Schiff-base reaction. The FPNs tailored thin-film composite membrane (FPN-TFC) with biomimetic asymmetric structure, e.g., much hydrophilic looser front surface and much hydrophobic denser rear surface, exhibits an optimum ethanol permeance ~15.7 L m −2 h −1 .MPa −1 and high rejection ~99.5% for Rose Bengal (RB) dye molecules (test with 0.05 g L −1 RB ethanol solution at 25 °C under 1.5 MPa), which is almost 6 times higher than that of the conventional TFC membranes. Moreover, there is a good stability for the FPN-TFC membrane tested with different polar solvents in long-term operation process. Therefore, this work provides a guidance for the development of advanced polymeric OSN membranes with both high solvent permeability and solute selectivity, as well as good stability in OSN process, which would have broad application prospects in chemical and other industrial fields.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Nana He,Lili Li,Jiaqi Chen,Junhao Zhang,Ce Liang
Extraordinary superhydrophobic polycaprolactone (PCL) composite membranes with an alternated hierarchical micro–nano structure were designed by addition of SiO2 aerogel. The highest water contact angle (WCA) of 166.8 ± 1.5° was obtained when SiO2 aerogel content was 0.5% (PCL/SiO2-a0.5) in the PCL composite membrane, which was higher than other reported polymer-based membranes. SiO2 aerogel lowered PCL composite membrane’s surface energy. The triple curvature structure composed of microspheres, nanospheres, and nanofibers produced on PCL/SiO2-a0.5 membranes endowed the excellent roughness of the surface. Also, the inner structure of the PCL/SiO2-a0.5 composite membrane composed of micro–nano spheres, nanofibers, and microfibers increased the porosity of the separation membrane, which would provide more adsorption space. The PCL/SiO2-a0.5 composite membrane as a separator for surfactant-stabilized emulsions of water-in-oil showed ultrahigh separation flux and efficiency. Meanwhile, the PCL/SiO2-a0.5 composite membrane had an outstanding chemical resistance, self-cleaning ability, and good reusability. The composite membranes reported in this work as eco-friendly separation materials possessed all these characters in oil/water separation. This research proposed a very simple method to design eco-friendly high-efficiency separators through the construction of the alternated micro–nano hierarchical structure.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 16
·9702-9711
·
IF 4.22
Yang Yongmei,Gao Xinna,Yang Sijun,Shen Yuhua,Xie Anjian
Abstract Fabricate surface-enhanced Raman scattering (SERS) substrate with low cost and high performance through simple method is a challenge and worthy of work. Herein, an excellent Cu 2 O SERS substrate with porous octahedron structure was synthesized by brief calcining Cu-MOFs in Ar, air and H 2 /Ar gas environment at 350 °C successively. The as-obtained octahedral Cu 2 O was utilized as SERS substrate to measure dye molecules and organic pollutants, which exhibited splendid sensitivity for the detection of methylene blue and 4-mercaptopyridine (4-MPY) with the ultralow limit of 5 × 10 –9 M and 5 × 10 –10 M, respectively. The maximum relative standard deviation for detection of 4-MPY is as low as 12.3%, which is less than limiting step in quantitative SERS (15.0%). The above excellent results are due to outstanding synergistic effect of electromagnetic enhancement of oxygen vacancy on the Cu 2 O surface and chemical enhancement of the Cu–S bonds formation. The fabricated Cu 2 O possesses superior sensitivity, selectivity and reproducibility for SERS detection of probe molecules with sulfhydryl groups and may be a prospect candidate in the practical application. Graphical Abstract
An excellent Cu 2 O SERS substrate with porous octahedron structure was synthesized by simple calcining Cu-MOFs in Ar, air and H 2 /Ar gas environment at 350 °C successively. The as-prepared Cu 2 O play significant roles in the enhancement of SERS signals for rich-thiol detection due to outstanding synergistic effect of electromagnetic enhancement of oxygen vacancy on the Cu 2 O surface and chemical enhancement of the Cu-S bonds formation. The detection limit of 4-Mercaptopyridine (4-MPY) can be as low as 5×10 –10 M. The porous octahedral Cu 2 O will have potential applications in SERS detection as the substrate.
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高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Mengdan Guan,Yameng Zhu,Xiaoping Yue,Yan Liang,Huixiang Sheng,Jin Wang,Chengyu Zhang,Qiming Peng,Gang Lu
The plasmon-mediated coupling reaction of nitroaromatic compounds is an effective strategy to synthesize the aromatic azo compounds that are widely applied in material science, pharmacy, and agricultural chemistry. Nonetheless, the reaction rate can be further improved since the lifetime of the plasmon-generated hot carriers is limited to femtoseconds or picoseconds. Herein, using in situ plasmon-enhanced Raman spectroscopy, we reveal that the adsorbed positively charged methyl violet molecules on the silver nanoparticle (Ag NP)–graphene oxide (GO) composite structure act as simple and cost-effective molecular cocatalysts, largely boosting the coupling of p-nitrothiophenol to p,p′-dimercaptoazobenzene. This boosting is attributed to the promoted separation of the plasmon-generated hot carriers at the Ag NP–GO interface. In addition, the reduction of laser power will help to promote the efficiency of the MV-induced acceleration. This work provides a highly simple, efficient, and cost-effective strategy to accelerate the coupling reaction of nitroaromatic compounds, and this strategy can be extended to the acceleration of many other plasmon-mediated chemical reactions.
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Lizhu Liang,Xuelian Li,Hao Hu,Jiayan Zhang,Ye Peng,Changkun Liu,Mengting Yang
The asymmetric wettability of Janus membranes has continuously drawn attention in various fields. In this paper, a Janus-cotton was prepared via a novel method using in-situ dual-phase formation and volatilization-induced fabrication. The n-hexane suspension of PDMS and SiO 2 was used to coat one surface of the water-wetted cotton fabric to form an in-situ dual-phase (n-hexane/water), where Janus-cotton was then prepared by volatilization and heating. One side of the prepared Janus-cotton was superhydrophobic, with a water contact angle of 151.1 ± 1.8°, while the other side was superhydrophilic with a water contact angle of 0°. This Janus-cotton can realize directional transport of water. Single layer Janus-cotton successfully separates lighter oil-water mixtures with the separation efficiency of 98%, while double layers can separate heavier oil-water mixture with the separation efficiency of 95%. Moreover, it has excellent water collection ability in oil.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yi Hao,Yuan Gao,Luyao Gao,Yulian He,Yingying Niu,Sameer Hussain,Ruixia Gao,Lisa D. Pfefferle,M. Shahid,Sicen Wang
A new class of amphiphilic magnetic adsorbents (denoted as Fe 3 O 4 -GPS-A) is fabricated by functionalization of the Fe 3 O 4 surface with six different amphiphilic silanizing agents that are specifically tailor-made to the chemical structure of PAEs. The resulting Fe 3 O 4 -GPS-A exhibit different contact angles due to the significant changes in functional groups, as revealed by 1 H NMR and FTIR spectroscopy. Among six Fe 3 O 4 -GPS-A, Fe 3 O 4 -DOA and Fe 3 O 4 -OAN exhibit a fast adsorption process (within 60 min) and high adsorption capacity for dibutyl phthalate (DBP) and dioctyl phthalate (DOP), two commonly used phthalate esters (173.7 mg g −1 for DOP and 104.4 mg g −1 for DBP), in conjunction with fast magnetic responsiveness and good thermal stability. The adsorption performance of Fe 3 O 4 -DOA and Fe 3 O 4 -OAN were well-maintained even after ten cycles. Besides, the adsorption mechanism was investigated through adsorption fitting models and theoretical calculations, which inferred that the interactions between adsorbent and adsorbate are mainly based on hydrophobic interactions along with secondary non-covalent contacts. Finally, the adsorbents combined with GC–MS analyses were applied to monitor DBP and DOP in the lake water samples. This work not only opens up a strategy for amphiphilic modification of magnetic adsorbents, but also provides a new avenue in their application for phthalate esters detection.
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高影响因子
危险品化学品经营许可证（带存储）