JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Song Wang,Zhe Wang,Jingmei Xu,Qian Liu,Zhiyan Sui,Xinming Du,Yinghe Cui,Yongjiang Yuan,Junjian Yu,Yan Wang,Yifang Chang
A bead-on-string electrospinning strategy is proposed to solve the dilemma of unstable conduction channel while improving the OH − conductivity of anion exchange membranes (AEMs). Here, poly (aryl ether ketone)-based AEMs are synthesized via N-spirocyclic quaternary ammonium modification, and then processed by electrospinning and sparingly soluble techniques. N-spirocyclic cations are induced to orient during electrospinning, as evidenced by the long-range ordered aggregation of ion clusters through EDX . Therefore, the electrospun membrane exhibits significantly higher conductivity (74 mS cm −1 at 80 °C) and alkaline stability, the conductivity remains above 97% after being kept in a solution of 2 mol/L KOH at 80 °C for 720 h. The swelling of the beaded membrane is only 12%, and the tensile strength is about 24.9 MPa. This work provides a simple and effective method to densify nanofiber mats.
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Qian Zhang,Si Chen,Zhi Huang,Yanying Liu,Jun-ming Hong
Nitrogen atom doping can effectively improve the electrocatalytic performance of graphene materials, and different nitrogen species play various roles. At present, high calcination temperature is commonly used to promote the production of graphitic N. To realize the oriented low-temperature doping of nitrogen atoms in graphene structure, we used O 3 -annealing method in this study to successfully prepare high-content graphitic N doped graphene oxide at 200 °C. Characterization results revealed that O 3 -annealing method can effectively promote the doping of N and O atoms. In addition, O 3 -annealing creating large amount defects for graphene, which directionally promoted the formation of graphitic N (reach 96.82%), which positively affected the improvement of material electrocatalytic properties. The results of bisphenol A (BPA) electrocatalytic degradation by O 3 -5 min-60 °C NGO showed that the degradation efficiency of BPA can reach 100% in 50 min under optimal conditions. The main active substances, namely O 2 − and 1 O 2 were probably generated from the edge oxygen functional groups (O-C=O and C=O) of the materials. BPA underwent a series of reactions, and was finally mineralized to CO 2 and H 2 O. This study provides a new strategy for the directional preparation of high content graphitic N doped graphene oxide for practical application.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xuantong Chen,Zhen Guo,Juemiao Liu,Fei Wu,Cheng Cheng,Heng Lin,Wei Ren,Hui Zhang
Waste herb residue biochar (WBC) was synthesized to activate peroxydisulfate (PDS) for the removal of different micropollutants. WBC prepared at 700 °C (WBC700) exhibits discrepant adsorption and PDS catalytic performance to three pharmaceuticals and four phenolic compounds. At 60 min reaction time, the adsorptive removal by 0.5 g/L WBC700 varied from 31.3% (clofibric acid) to 97.6% (4-chlorophenol), while the apparent removal ranged from 36.1% (clofibric acid) to 99.5% (4-chlorophenol) when 0.5 g/L WBC700 and 1.0 mM PDS were applied. The oxidation of the micropollutants involves electron transfer mechanism via the surface-confined metastable reactive complexes (WBC-PDS*), which was verified by electrochemical tests, quenching experiments, electron paramagnetic resonance, Fourier transform infrared and in-situ Raman spectroscopy. The observed pseudo first-order kinetic constant ( k obs ) of organic removal did not exhibit a good correlation with its electrochemical redox descriptor (half-wave potential, φ 1/2 , for example) as reported in the previous studies. Instead, the surface oxidation rate constant ( k oxid ), determined from a dynamic model considering liquid-solid mass transfer of micropollutant and the sequent surface oxidation by WBC-PDS* complexes, was highly related to φ 1/2 . In parallel, the liquid-solid mass transfer coefficient ( K L a) of micropollutant was obtained from a similar model excluding the surface oxidation, and k obs showed a more significant association with K L a than with adsorption capacity ( Q e ). This study provides a promising approach to understand the role of adsorption and surface oxidation in an electron transfer-dominated persulfate activation process.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Hao Dong,Yihui Zou,Kewei Zhang,Yuanyuan Sun,Bin Hui,Dongjiang Yang,Liping Cai,Jian Li
The controllable and large-scale synthesis of Fenton-like catalysts advances the development of industrial wastewater treatments, but a great challenge is remained due to its low catalytic activity at a wide pH range and poor cyclic utilization. Herein, the urchin-like Cu 2 O/CuO heterojunction on a multi-channeled wood carbon was rationally designed as a heterogeneous catalyst for enhancing degradation of aromatic organic pollutants. The results showed that the wood carbon-based catalysts could make pollutants to be degraded efficiently in the pH range of 5.0–12.0. The high-performing wood carbon-based materials exhibited the high removal rate of over 90.0% even after 5-cycles. Benefited from the induction effect of wood carbon, the Cu 2 O/CuO heterojunction with bionic structure was anchored accurately and selectively. The as-prepared Cu 2 O/CuO@wood carbon exhibited efficient water transport capacity because of high specific surface area and rich channels. The Cu(II)/Cu(I) redox circulation and defective carbon synergistically boosted the generation of hydroxyl radicals (•OH) and singlet oxygen ( 1 O 2 ), which were primarily involved into the degradation process. The density functional theory calculations further unveiled that the Cu 2 O/CuO heterojunction could possess large adsorption energy for H 2 O 2 and induced increased number of electron transfer for enhancing breakage of O O bonds. This research opens up a new avenue for the biomimetic synthesis of heterogeneous catalysts for industrial wastewater treatments.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Sihan Huang,Yaohan Chen,Xue Wang,Jing Guo,Yonggang Li,Lei Dai,Shenghai Li,Suobo Zhang
The past few decades have witnessed rapid gains in our demands of antifouling membranes such as water purification membranes and hemodialysis membranes. A variety of methodologies have been proposed for improving the antifouling performance and the hemocompatibility of the membranes. In this study, a series of copolymers (PSF-PESSB) containing polysulfone (PSF) and poly(arylene ether sulfone) bearing pendant zwitterionic sulfobetaine groups (PESSB) were prepared via one-pot polycondensation . Subsequently, the ultrafiltration (UF) membranes were prepared from different zwitterion-containing copolymers. The prepared membranes showed high thermal stability and mechanical properties. Besides, it also displayed attractive antifouling performance and blood compatibility. Compared with the original PSF membrane, the amount of protein absorption on the modified membrane was reduced; the flux recovery ratio and the resistance to blood cells were significantly improved. The results of this work suggest that PSF-PESSB membranes are expected to be applied in blood purification. The introduction of zwitterion-containing polymers to membranes paves ways for developing advanced hemodialysis technologies for crucial process.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yanqing Cong,Xiang Chen,Wanxing Wang,Lingjie Ye,Yi Zhang,Shi-Wen Lv
Herein, MOF-derived magnetic CoFe 2 O 4 with oxygen vacancy was successfully synthesized to activate peroxymonosulfate (PMS) for the effective degradation of emerging organic contaminants. The introduction of oxygen vacancy not only increased the specific surface area of CoFe 2 O 4 , but also reduce the charge transfer resistance. The CoFe 2 O 4 with oxygen vacancy showed low charge transfer resistance and oxidation potential. Benefitting from the existence of oxygen vacancy, the PMS could be activated quickly by CoFe 2 O 4 to produce SO 4 •− . As expected, developed CoFe 2 O 4 /PMS oxidation system displayed the excellent degradation ability toward various typical organic pollutants , and the organic pollutant could be mineralized into CO 2 , H 2 O and other inorganic molecules. Interestingly, both redox couples of Fe 3+ /Fe 2+ and Co 3+ /Co 2+ played a critical role in the PMS activation process. The SO 4 •− , OH • , O 2 •− and 1 O 2 were major active species in the CoFe 2 O 4 /PMS system, which were responsible for the degradation of organic pollutants . Furthermore, proposed CoFe 2 O 4 /PMS oxidation system also presented a wide pH range of applicability. The existence of magnetic property was convenient for the recovery of catalyst. All in all, this study provided a promising catalyst for the activation of PMS, and obtained results injected some new insights into the research on advanced oxidation processes (AOPs).
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Weijie Yang,Kailong Sun,Jun Wan,Yang-Ai Ma,Yu Wang,Lin Liu,Bicheng Zhu,Feng Fu
Solar-driven activation of molecular oxygen (O 2 ) offers an appealing strategy to realize aerobic oxidation catalysis at room temperature, while the efficiency of photocatalytic O 2 activation is severely limited by lacking O 2 adsorption sites and poor carrier utilization. Herein, an efficient Ni 2 P/Bi 3 O 4 Br-OVs heterojunction is firstly proposed to overcome the limitation by the dual-site design of oxygen vacancies (OVs) and on Ni 2 P cocatalyst. By the joint observations from spectroscopic measurements and theoretical simulations, the introduction of OVs and Ni 2 P on Bi 3 O 4 Br nanosheets can not only optimize the light absorption, facilitate the separation and transfer of photogenerated charge carrier through the S-scheme mechanism, but also provide active sites for effective adsorption and activation of oxygen molecules, thereby contributing to highly efficient generation of •O 2 − radicals. Benefiting from the more oxidative active species of •O 2 − and h + , the Ni 2 P/Bi 3 O 4 Br-OVs photocatalyst achieves near-unity conversion rate and selectivity in aerobic oxidation of sulfide to sulfoxide, and it also exhibits outstanding photoactivity in the aerobic degradation of phenolic pollutants under visible light. This study showcases a feasible O 2 activation approach by defect and heterojunction engineering, and provides a new perspective for designing high-performance photocatalysts in the field of aerobic oxidation catalysis.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 30
·期 5
·12813-12824
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IF 5.19
Cao Ting-Ting,Cui Han,Zhou Dan-Dan,Ren Xin,Cui Chong-Wei
Bisphenol A (BPA) is regarded as a hazardous pollutant that exists widely in aquatic environments, posing a severe threat to human health. In this study, a vacuum ultraviolet (VUV) lamp emitting a hybrid of 254 nm and 185 nm light was used to degrade BPA. Results indicated that photolysis via 254 nm wavelength accounted for 24.93% for BPA decay, while indirect oxidation was responsible for 52.27% of decay. Results confirmed that the degradation of BPA under VUV illumination mainly occurred via photo-excited degradation and ·OH electrophilic addition reactions based on average local ionization energy (ALIE) calculation and density functional theory (DFT) calculations. Therefore, only light with a wavelength of 254 nm was able to induce the first three excited states of BPA, forming the electron transition type of n → π* from O atom to a single benzene ring and π → π* in the single benzene ring. Indirect oxidation by ·OH occurred as it preferentially attacked the C6 atom in BPA ring A. Moreover, the energy required for photo-excited degradation was about twofold than that of ·OH electrophilic addition reactions.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jinjuan Xue,Jin Li,Jiamin Gao,Mingxin Wang,Shuaishuai Ma
Effective synchronous removal of water-immiscible oils and water-miscible refractory aromatic pollutants from wastewater is of great significance for water remediation. In this work, a low-cost and easy-prepared composite membrane was fabricated by vacuum assisted assembling of CoFe 2 O 4 and tannic acid on polyvinylidene fluoride (PVDF) substrate. The CoFe 2 O 4 functionalized PVDF membrane (CoFe 2 O 4 @PVDF) exhibited in-air superamphiphilic and underwater superoleophobic surface wettability. The resultant membrane displayed relatively favorable permeation flux (811.5 to 1837.5 Lm −2 h −1 ) and high separation efficiency (above 99 %) in the separation of a series of emulsified oils ranged from nanoscale to microscale from water. Meanwhile, the as-fabricated CoFe 2 O 4 @PVDF membrane coupled with peroxymonosulfate (PMS) exhibited an extensive oxidizing capacity and high degradation efficiency towards aromatic contaminants with desired mineralization ability. More importantly, considering that the fabricated CoFe 2 O 4 @PVDF membrane possessed special super-wettability as well as PMS activation-based catalytic ability, it also applied in the treatment of simulated complex wastewater. The process achieved effectively synchronous oil/water separation and PMS activation toward pollutants degradation. Besides, in five cyclic continuous “degradation-separation” tests, the recovered CoFe 2 O 4 @PVDF membrane after PMS-based degradation in each cycle could separate oil/water emulsions as usual. It exhibited almost complete oil rejection and flux recovery property under multicycle filtration, demonstrating its excellent durability and stability. This flexible integration of PMS-based AOP catalytic capability and super-wettability into a composite membrane can provide inspiration for effective complicated wastewater rehabilitation.
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CARBON
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2022
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IF 11.307
Jianqiao Liu,Kai Yan,Jingdong Zhang
As an advanced oxidation technology, photoelectrocatalysis (PEC) has been widely explored to degrade refractory contaminants in the environment. Meanwhile, enzymatic biodegradation provides an effective approach to removal of organic pollutants under mild conditions. Herein, we developed a biophotoelectrocatalytic system to remove bisphenol A (BPA) based on the combination of PEC and enzymatic biodegradation. We utilized carbon fiber cloth (CFC) as substrate to construct a dual-photoelectrode biophotoelectrocatalytic system based on three dimensional (3D) nanostructured TiO 2 photoanode with oxygen vacancy defects (Ov-TiO 2 /CFC) and enzyme-coupled CuO/g-C 3 N 4 /CFC photocathode. The excellent PEC performance of Ov-TiO 2 /CFC photoanode significantly promoted the formation of reactive radicals for the degradation reaction, ascribed to efficient separation and migration of photogenerated carriers. The proposed system displayed good synergistic effect between PEC and enzymatic catalysis for BPA removal, with more than 99% degradation efficiency after 90-min treatment. This work demonstrates CFC as a useful substrate material for constructing highly efficient biophotoelectrocatalytic degradation system for organic pollutant removal.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Yibie Qin,Zuohua Liu,Changyuan Tao,Jiancheng Shu,Xia Xiong
A new porous β-cyclodextrin-based polymer (PCD-Gs) adsorbent was synthesized by the copolymerization of allyl-β-CD and partially allylated gallic acid under different monomer feeding ratios. With a series of single-factor experiments, it was found that the PCD-Gs not only exhibited ultrarapid and efficient absorption capacity for bisphenol A and Cd(II) but also possessed strong bactericidal ability and good resistance to salt and acid. Multivariate analyses showed that there was no competitive adsorption but a positive effect between Cd(II) and bisphenol A on PCD-Gs in the binary system. Besides, the PCD-Gs had outstanding regeneration ability and removal efficiency even at environmentally relevant concentrations. Combined with 1H NMR analysis, a multimechanism was suggested that the polymer of PCD-Gs possesses multiple action sites and presents great potential for simultaneously and effectively removing organic micropollutants, metal ions, and detrimental microorganisms from contaminated water, which contributes to deep purification of water and simplification of the water treatment process.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2022
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IF 11.357
Mei-Mei Wang,Li-Juan Liu,Jia-Tai Wen,Ying Ding,Jia-Rui Xi,Jia-Cheng Li,Fang-Zheng Lu,Wei-Kang Wang,Juan Xu
In situ growth of nanostructures on substrates is a strategy for designing highly efficient catalytic materials. Herein, multimetallic CuCoNi oxide nanowires are synthesized in situ on a three-dimensional nickel foam (NF) substrate (CuCoNi–NF) by a hydrothermal method and applied to peroxydisulfate (PDS) activation as immobilized catalysts. The catalytic performance of CuCoNi–NF is evaluated through the degradation of organic pollutants such as bisphenol A (BPA) and practical wastewater. The results indicate that the NF not only plays an important role as the substrate support but also serves as an internal Ni source for material fabrication. CuCoNi–NF exhibits high activity and stability during PDS activation as it mediates electron transfer from BPA to PDS. CuCoNi–NF first donates electrons to PDS to arrive at an oxidized state and subsequently deprives electrons from BPA to return to the initial state. CuCoNi–NF maintains high catalytic activity in the pH range of 5.2–9.2, adapts to a high ionic strength up to 100 mM, and resists background HCO3– and humic acid. Meanwhile, 76.6% of the total organic carbon can be removed from packaging wastewater by CuCoNi–NF-catalyzed PDS activation. This immobilized catalyst shows promising potential in wastewater treatment, well addressing the separation and recovery of conventional powdered catalysts.
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