SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Zehao Chen,Ting Zhao,Qing Tan,Jihao Zuo,Shouping Xu,Yunjun Nong,Xiufang Wen,Pihui Pi
The crude oil spillage and large-scale industrial release of oily effluents has led to significant ecological degradation and resource wastage. Traditional superwetting materials encounter intractable challenges for treating surfactant-stabilized oil–water emulsions, including trade-off effect of permeation flux and separation efficiency, and low emulsion processing life. These issues considerably impede advancements in oil–water separation industry. In order to enhance the demulsification durability of materials while ensuring high separation efficiency and flux, this work doped perfluorooctanoic acid (PFOA) onto the modified sponge surface with superhydrophilic charged surface, and a unique in-air superhydrophilic-oleophobic sponge was prepared. This special surface allows rapid water phase permeation yet offers remarkably more stable oleophobicity compared with traditional underwater oleophobic materials when processing a large amount of emulsions. The intrinsic oleophobicity endows the sponge outstanding fouling resistance and greatly increases the one-cycle emulsion treatment amount up to 1695 L·m −2 . Moreover, the sponge's inherent long permeation channels and surface charge maintain a high separation efficiency of over 97 %. The large pores of the sponges and superhydrophilic surface provide a high permeation flux exceeding 40,000 L·m −2 ·h −1 . The sponge with high separation efficiency, flux, and capacity marks a significant advancement, offering a promising strategy for superwetting material applications in oil-in-water emulsion separation fields.
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高影响因子
Journal of Environmental Chemical Engineering
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2026
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IF 7.5
Ying Xue,Xiaonan Hao,Yue Wu,Yang Xu,Jundi Long,Jian Dong,Yuanrui Wang,Shulin Sun
Combined NVP grafting and MMT@ZIF-8@TA modification raised pure water flux to 836.84 L·m⁻²·h⁻¹, ~6.8× of pristine PLA membrane. • The membrane retained over 95% rejection for four cationic/anionic dyes, realizing charge-selective adsorption (98% MeB removal, 99% AO removal). • PZ4 membrane removed 78.59% methylene blue under UV in 150 min; its rate constant (0.00995 min⁻¹) was ~110 times the blank group. • Superoxide (•O₂⁻) and hydroxyl (•OH) radicals were verified as the main active species during photocatalytic degradation. Rapid industrialization and urbanization have exacerbated water scarcity and pollution. Traditional polymer membranes are non‑renewable and non‑biodegradable. Polylactic acid (PLA) is a biodegradable and renewable alternative, but its hydrophobicity and lack of functional groups restrict its direct application in water purification. To address these limitations, we grafted N‑vinylpyrrolidone (NVP) onto PLA chains via free‑radical polymerization to obtain PLA‑g‑PVP with enhanced hydrophilicity. Zeolitic imidazolate framework‑8 (ZIF‑8) was grown in situ on montmorillonite (MMT) and coated with tannic acid (TA) to obtain MMT@ZIF‑8@TA nanoparticles, which synergistically improve membrane porosity, adsorption capacity, and photocatalytic activity. A series of PLA‑g‑PVP/MMT@ZIF‑8@TA (PZ) membranes were fabricated by non‑solvent induced phase separation. The PZ4 membrane exhibited a pure water flux of 836.84 L·m⁻²·h⁻¹ , approximately 6.8 times that of pristine PLA, and achieved over 95% rejection for four representative dyes, including both cationic (auramine O, methylene blue) and anionic (congo red, methyl blue) dyes. After five cycles, the flux recovery rate remained 81.03% with dye rejection > 90%, showing excellent reusability. The PZ membranes also demonstrated adsorption and photocatalytic activity. The PZ4 membrane degraded 78.59% of methylene blue within 150 min under UV irradiation, attributed to efficient separation of photogenerated electron‑hole pairs and synergistic oxidation by hydroxyl (·OH) and superoxide (·O 2 ⁻) radicals, leading to dye mineralization. This eco‑friendly membrane integrates high separation efficiency, which shows great potential for the purification of dye-containing wastewater, and sheds light on the design of multifunctional composite filtration membranes. Download: Download high-res image (266KB) Download: Download full-size image
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Wenyu Lu,Hongzhen Cai,Wenbin Zhang,Zhiqiang Qi,Keyan Yang,Xiangsheng Han
Nanoscale biochar is a promising material for the remediation of polluted water due to its low-cost sustainability, nevertheless, which still hindered by the self-aggregation and vulnerability issues in actual wastewater. In this work, biochar nanosheets (BCN) were successfully molded into membranes and aerogels with the help of aramid nanofibers (ANF) through a co-assembled process. Ascribing to the improved molecular sieving effects and electrostatic interactions of co-assembled membranes, as well as the superior chemical and thermal stabilities, the resultant ANF/BCN x membranes exhibited favorable dye separation performances toward rhodamine 6 G (R6G) even under high-temperature (e.g., ∼96.1 L·m −2 ·h −1 ·bar −1 and ∼97.4% at 80 °C) and strong acidic conditions (e.g., ∼84.1 L·m −2 ·h −1 ·bar −1 and ∼97.9% for 10 wt% H 2 SO 4 solutions). Besides, due to the reduced vaporization enthalpy, the ANF/BCN x aerogels as solar steam generators also demonstrated promising capability for clean water production even in 5 wt% H 2 SO 4 solutions (an evaporation rate of ∼1.0 kg·m −2 ·h −1 and an impressive efficiency of ∼89.9% under one sun illumination). Compared to conventional biochar materials, this work offered simple feasible morphology engineering designs to prepare multifunctional biochar-based composites with unique co-assemble structures, while also demonstrated great potential in wastewater remediation under extreme conditions.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Rongna Liu,Panqing Qi,Hongyi Wang,Luyao Wei,Tao Wu,Yujiang Li
A battery sponge (BS), with the superhydrophilic positive and negative electrode, was modified for demulsifying various oil-in-water emulsions without power device. Two mechanisms of BS, same charge-BS (SC-BS, BS electrode first contact with same charged emulsion) and opposite charge-BS (OC-BS, BS electrode first contact opposite charged emulsion), were explored. The positive electrode PEI@PDA@PU (PPP) and negative electrode OA@PEI@PDA@PU (OPPP) were singularly compared with BS to elucidate the demulsification performance and mechanism. Among them, OC-BS achieved the best effect: it reduced the emulsion zeta potential to below 20 mV (absolute value); separation efficiency exceeded 99.9 %; the demulsified oil droplets coalesced inside the sponge; and residual oil droplet size of filtrate was larger than the original emulsions. Furthermore, OC-BS adapted to various emulsions, can be recycled 30 cycles (separation efficiency ≥ 99.5%), and possessed high stability. The optimally-performing OC-BS was due to the repeated action of synergistic superhydrophilic positive and negative electrodes on the charged oil of emulsion, which were demulsified to the maximum degree inside the superhydrophilic sponge. It was electrostatic action, hydrophobic effect, capillary force, and oil viscosity played the main role in oil–water separation. SC-BS only demulsified the oil droplets twice. PPP was affected by emulsion type. OPPP performance was stable but unremarkable. Meanwhile, positively and negatively charged BS could also attract cationic/anionic dyes in wastewater. The results demonstrated that BS can be effectively utilized as a demulsification material and applied to purify various emulsions.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Kai Mi,Xingpei Ji,Sen Xiong,Yong Wang
Conjugated microporous polymers (CMPs) have great potential in membrane separation for their intrinsic microporosity and outstanding stability. Unfortunately, most CMPs are insoluble and infusible, thus it is very challenging to prepare CMPs membranes through conventional strategies. Herein, we report the molecular layer deposition (MLD) strategy to synthesize CMP thin films and their outstanding molecular sieving performances as nanofiltration membranes. Thanks to the gas-phase self-limiting reactions between volatile monomers during MLD, defect-free and large-area CMP thin films are deposited on porous substrates. The thickness of the CMP films is precisely tuned by the repeating MLD cycle numbers, and 100 MLD cycles result in a CMP thin film with the thickness of ∼ 70 nm. The as-prepared composite membranes with the deposited MLD thin films as the selective layers exhibit superior molecular sieving properties with a permeance up to 134 L m -2 h −1 bar −1 , outperforming other CMP membranes. In addition, the perm-selectivity of CMP membranes can be easily tuned by changing MLD cycle numbers. We further demonstrate that, by optimizing the deposition process including selecting proper precursors, CMP thin films can be successfully MLD-deposited onto temperature-sensitive polymeric substrates with the size as large as 10 cm × 10 cm. This work shows the feasibility and great potential of MLD synthesis of CMP thin films, which opens new avenues not only for the synthesis of CMPs with highly controllable thickness, but also for the preparation of advanced membranes for diverse applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Zhiwei Yang,Jing Zhang,Xixi Sun,Xinyu Wang,Yueqi Pan,Jiagang Wu,Xianchun Chen
Taking use of mechanical-to-chemical energy is a promising way to develop sustainable catalysis, but it is hindered by the low reactive oxygen species (ROS) yield induced directly by intrinsic carriers. In this paper, by coupling piezocatalysis with sulfite (S(IV)) activation via a g-C 3 N 4 /S(IV)/US ternary system, piezoelectric holes react with S(IV), triggers a chain reaction and brings about a considerable ROS generation for enhancing the degradation of organic pollutants. As a result, profiting from the crucial electron-gaining ability of holes, the k obs of metronidazole removal after adding g-C 3 N 4 increases by 2.02 times from 0.0161 min −1 to 0.0325 min −1 . This enhancement occurs because the piezoelectric holes can both promote the transfer of electrons from S(IV) to g-C 3 N 4 and the generation of sulfite radical ( SO 3 − ). By this way, the SO 3 − rapidly reacts with the dissolved oxygen to generate sulfate radical and hydroxyl radical through a chain reaction for water remediation. This study provides a novel strategy to maximize the utilization of piezoelectric holes.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2023
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IF 11.4
Abdul Ghaffar,Muhammad Hassan,Oleksiy V. Penkov,Cafer T. Yavuz,Kemal Celebi
Molecular separations involving solvents and organic impurities represent great challenges for environmental and water-intensive industries. Novel materials with intrinsic nanoscale pores offer a great choice for improvement in terms of energy efficiency and capital costs. Particularly, in applications where gradient and ordered separation of organic contaminants remain elusive, smart materials with switchable pores can offer efficient solutions. Here, we report a hierarchically networked porous organic cage membrane with dynamic control over pores, elucidating stable solvent permeance and tunable dye rejection over different molecular weights. The engineered cage membrane can spontaneously modulate its geometry and pore size from water to methanol and DMF in a reversible manner. The cage membrane exhibits ≥585.59 g mol–1 molecular weight cutoff preferentially in water and is impeded by methanol (799.8 g mol–1) and DMF (≈1017 g mol–1), reflecting 36 and 73% change in rejection due to self-regulation and the flexible network, respectively. Grazing incidence X-ray diffraction illustrates a clear peak downshift, suggesting an intrinsic structural change when the cage membranes were immersed in methanol or DMF. We have observed reversible structural changes that can also be tuned by preparing a methanol/DMF mixture and adjusting their ratio, thereby enabling gradient molecular filtration. We anticipate that such cage membranes with dynamic selectivity could be promising particularly for industrial separations and wastewater treatment.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Junjie Zhang,Yongjia Hong,Xu Tang,Yong Chen,Wenran Gao,Yuncheng Cai,Ningning Dong,Jiazi Xu,Li Zhang,Quli Fan,Bin Sun
The rational design of active sites in nanocarbons are the long-term pursuit for their practical applications. However, N, as the most potential active site, still encounters the problems of low atom utilization efficiency and stability in practical environmental remediation. Herein, we successfully constructed synergistic active sites consisting of graphitic N, pyridinic N, and thiophene S in heavy S, N co-doped hollow graphene spheres (HSNGS). The HSNGS exhibited exceptional efficiency in degrading tetracycline in real water, with a turnover frequency of 6.24 min −1 , which is among the highest reported. Moreover, tetracycline dissolved in practical water could be continuously and rapidly eliminated by passing through a column filled with HSNGS, maintaining its high performance even after 40 consecutive cycles. In the synergistic active sites, graphitic N and pyridinic N species accepted electrons from peroxymonosulfate, generating singlet oxygen for tetracycline degradation. Simultaneously, thiophene S coordinated with metal ions present in the practical water, synergistically enhancing the degradation of tetracycline. Additionally, the coordinated metal ions provided protection for the synergistic active sites during peroxymonosulfate activation, preventing their oxidation and enabling the continuous and rapid degradation of tetracycline. This work opens up possibilities for the industrial application of nanocarbon materials in environmental remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Xu Yang,Ligang Lin,Zitian Liu,Jing Yang,Qi Cheng,Wensong Ma,Meina Xu,Fengling Tang,Qiying Wang,Xinyang Li,Aishan He,Chunhong Wang,Xiaolan Zhang
It is extremely difficult to separate salts and dyes from high-salinity printing and dyeing wastewater. In this study, modified montmorillonite (EPTAC-CD-MMT) was obtained by intercalation of 2,3-epoxypropyltrimethylammonium chloride (EPTAC) modified cyclodextrin (CD). PI/EPTAC-CD-MMT membrane was prepared by blending EPTAC-CD-MMT with polyimide (PI). The addition of EPTAC-CD-MMT could inhibit the motion of PI molecular chains and increase the solvent resistance of the membrane. Additionally, EPTAC-CD-MMT exhibited spontaneous “internal drive” during the phase transition and segregated to the membrane surface. The pore structure of the membrane was adjusted to a well-developed “side pore” structure. Thus, solvent-resistant membranes for dye/salt separation with high flux were finally obtained. The successful modification of MMT was demonstrated by FTIR, XRD, TGA and XPS. EDX and SEM were used to characterize the surface segregation phenomena and well-developed pore structures of the membranes. When EPTAC-CD-MMT was added at 3 wt%, the membranes showed a significant increase in pure water flux (138.0 L·m −2 ·h −1 ·bar −1 ), high dye rejection (>98.5 %), low salt rejection (<10.0 %), and good solvent resistance in six organic solvents. This demonstrated the potential of PI/EPTAC-CD-MMT separation membranes for the treatment of dye wastewater containing sophisticated organic solvents.
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CONSTRUCTION AND BUILDING MATERIALS
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2023
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IF 7.4
Zhaorong Zhu,Yiyan Lu,Man Zhou
A fast, facile and highly efficient approach was developed in this study for the modification of recycled rubber particles (RP) into modified rubber particles (RP-TA-Fe 3+ ). The incorporation of RP-TA-Fe 3+ in cement-based materials effectively counteracted the detrimental effects typically associated with rubber. The TA-Fe 3+ metal phenolic network proficiently impeded the leaching of heavy metal ions from the modified rubber and also effectively adsorbed cationic pollutants (MB and Cu 2+ ) from water. The experimental results revealed that the rubber mortar containing RP-TA-Fe 3+ exhibited reduced porosity and significantly improved flexural and compressive strength compared to the rubber mortar containing RP. Furthermore, the incorporation of RP-TA-Fe 3+ into cement-based materials markedly enhanced their adsorption capabilities for MB and Cu 2+ .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Jing Yang,Zixu Zhang,Ligang Lin,Fengling Tang,Meina Xu,Zitian Liu,Xu Yang,Qiying Wang,Wensong Ma,Qi Cheng,Aishan He
Accurate separation of dyes/salts is a crucial step in the treatment of dye-containing wastewater. Therefore, separation membranes with high permeability and high dye/salt selectivity are urgently required. In this study, an ultrathin gel layer of carboxymethyl cellulose was constructed on a poly(vinylidene fluoride) membrane surface. This gel layer contains a backbone support structure and provides the bionic-inspired capillary effect, which endows the membrane with the capability to realize the efficient separation of dyes and salts. The introduction of silver nanoparticles (Ag NPs) into the gel layer provides a skeleton support structure, which prevents the collapse of the gel layer, reduces the actual separation layer thickness, and decreases the mass transfer resistance. Moreover, the formation of capillaries between the numerous Ag NPs facilitates the rapid penetration of water molecules. Interestingly, this membrane exhibited excellent selectivity for dye/salt separation (dye removal >99.5 %, salt removal <10 %) while maintaining an exceptionally high water permeate flux (244.5 L/m 2 h). Moreover, the membrane exhibited excellent stability. This study demonstrates that the construction of organic/inorganic three-dimensional structures with capillary and skeletal support effects show promise potential for modification of dye/salt separation membranes.
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高影响因子
LANGMUIR
·
2023
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IF 3.9
Wenyu Lu,Hongzhen Cai,Xiangsheng Han,Keyan Yang,Hui Wang,Xun Wu,Li Liu
Two-dimensional (2D) sheet-like biochar as promising alternatives to graphene nanosheets has gained significant attention in materials science while being highly restricted by its complicated synthetic steps. In this study, the dimethyl sulfoxide/potassium hydroxide (DMSO/KOH) superbase system was first used to pretreat sweet sorghum residues (SS) and then carbonized to prepare sheet-like biochar. Ascribing to the strong nucleophilicity of DMSO/KOH, a synergistic effect was achieved by partially removing non-cellulosic components in SS and swelling the amorphous region of cellulose, leaving more layered cellulose behind (∼46.5 wt %), which was favorable for the formation of 2D biochar nanosheets with high graphitization degrees (∼93.1%). This strategy was also suitable for other biomass fibers (e.g., straw, wood powders, and nuclear shells) to obtain sheet-like biochar. The resulting sheet-like biochar could be compounded with cellulose nanofibers to achieve the structural design of composites and solve the molding problem of biochar, which was beneficial for dyeing wastewater treatment. Thus, this work provides insight into a simple strategy for developing 2D ultrathin sheet-like biochar from sustainable biomass wastes.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）