JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2018
·
IF 2.891
Bo Gao,Weiping Chen,Jiadong Liu,Jiajun An,Lei Wang,Ying Zhu,Mika Sillanpää
Based on the concept of dynamic membrane and photocatalytic membrane reactor (PMR), the dynamic photocatalytic membrane reactor is developed via deposition of ZnIn 2 S 4 suspension on polyvinylidene fluoride (PVDF) membrane. Operating with effluent circulating to the photocatalytic membrane reactor, the highest total organic carbon (TOC) removal efficiency of 57% is obtained after 3 h reaction with 1.88 mg cm −2 photocatalyst under the flux of 84.06 L m −2 h −1 and light intensity of 50 mW cm −2 . Operating with continuous influent and effluent mode under the flux of 26.09 L m −2 h −1 and light intensity of 50 mW cm −2 , an average of 50% removal efficiency can be maintained during the 24 h photocatalytic reaction with photocatalyst loading of 1.88 mg cm −2 when the initial concentration of tetracycline is 10 mg L −1 . Under the same operating conditions, more than 92% removal efficiency can be maintained during 36 h photocatalytic reaction when lower initial concentration of 100 μg L −1 is applied. After this reaction, the characterizations show that the surface and structure of PVDF basement membrane are not affected.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Han Jiang,Tao Wang,Shuo Li,Zhi-Ping Zhao
Catalytically active membranes are the core components of the membrane reactors . Polysulfone (PSF) grafted with ionic liquids (ILs), PSF-DG-ILs, was prepared via introducing chloromethyl group into benzene ring of PSF, then grafting ILs, imidazolyl acid ILs ([(CH 2 ) 3 SO 3 HVIm]HSO 4 ), by chemical bonding. Then PSF-DG-ILs membranes were prepared by non-solvent induced phase separation technique for hydrolysis of inulin. The effects of coagulation bath, grafting degree, and various dope blending on structure, physico-chemical characters, and catalytic performance of membranes were evaluated. And results revealed that catalytic performance could be efficiently enhanced by choosing ethanol as coagulation compared with ethyl acetate, which was mainly attributed to surface segregation. Membrane mechanical strength decreased with the enhancing ILs grafting degree, while the catalytic performance increased. However, PSF-DG-ILs with high degree of ILs grafting lost its membrane-forming property. The mechanical and catalytic properties of the membrane were synergistically enhanced by blending PSF-DG-ILs polymers with high and low ILs grafting degree, then the resulting membranes broke the trade-off effect between mechanical strength and catalytic ability. Specifically, membrane fabricated by mixing the polymers with ILs grafting degree of 0.31 and 0.59 integrates optimized mechanical property and catalysis performance. The strength and strain of this blending membrane are 3.17 MPa and 14.10%. The average pore size and porosity are 215.5 nm and 46.2%. The yield of inulin hydrolysis can reach 88.22% with 20 wt% concentration of inulin at 75 °C using a flux of 23.4 L/(m 2 ·h). Therefore, the PSF-DG-ILs membrane displayed promising potential for the application in biomass conversion .
研究领域:
生物工程
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Yukun Wang,Hao Zhang,Rong Fan,Yinhua Wan,Mei Huang,Shiyong Huang,Lixia Pan,Jianquan Luo
Enzyme membrane reactor (EMR) provides an effective strategy for controlling molecular weight (Mw) of oligodextrans. However, the synergistic effect between dextran hydrolysis and product separation as well as continuous operation stability remains still unclear. We observed that covalently immobilized dextranase exhibited more obvious exo -hydrolysis behavior compared to free enzymes probably due to enzyme conformational alterations. Using non-covalently immobilized enzyme, suitable ultrafiltration membrane, optimal substrate/enzyme ratio and matched permeate flux, the yield of the target product reached 62.8%. However, the non-covalently immobilized dextranase exhibited reduced hydrolytic activity and more obvious membrane fouling (caused by high-Mw dextran). When free dextranase with high activity was used together with suitable permeate flux and high shear rate, the yield increased to 72.0%. The obtained EMR maintained stable for 8 h with slight fouling formation because enzymatic hydrolysis and membrane separation were well matched. The polydispersity index of the target product reached 1.3 (analytical grade) following diafiltration purification.
研究领域:
生物工程
·
食品科学
·
酶技术
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Xiaoping Chen,Yuansong Wei,Bohong Chen,Jiaqi Fu
In this study, a Ti foam-based photocatalytic membrane reactor (PMR) was constructed for rhodamine B (RhB) wastewater decolorization. Ti foam was chosen as a membrane and visible-light-driven C3N4 was chosen as a photocatalyst. The results showed that the decolorization efficiency could be up to 100% with a flow rate of 6.93 mL/min when the PMR was applied in the treatment of a 30 mg/L RhB solution and the concentration of C3N4 was 1 g/L. pH played an important role in the decolorization performance of the PMR. Alkalinity was not conducive to the decolorization of RhB in the PMR, which was mainly due to the property that RhB was difficult to dissolve in an alkaline solution. Membrane fouling was mainly caused by a C3N4 photocatalyst, while the effect of RhB on membrane fouling was negligible. Membrane fouling could be retarded when the PMR was applied for RhB treatment under visible-light irradiation, which was because of photoinduced hydrophilicity of C3N4. The membrane flux could be restored to its initial values after simple ultrasonic cleaning and backwashing. This was due to the large difference between the pore size of Ti foam and the particle size of C3N4 and the super hydrophilicity of Ti foam and C3N4.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Chengliang Wu,Yun Jin,Yiyi Fan,Ngie Hing Wong,Jaka Sunarso,Xiuxia Meng,Naitao Yang
Hydrogen (H2) production by ammonia (NH3) decomposition offers a solution to the energy problem. In this work, an MXene (titanium carbide, Ti3C2TX) membrane was successfully synthesized by depositing it onto the anodic aluminum oxide (AAO) substrate using vacuum-assisted filtration. Then, a membrane reactor supported by MXene was developed for H2 production by NH3 decomposition. The MXene membrane reactor could achieve an H2 permeance of 2.85 × 10–7 mol m–2 s–1 Pa–1 and an H2/N2 selectivity of 20 at 773.15 K. Next, a Ni-La/γ-Al2O3 catalyst prepared by impregnation and sintering was added to catalyze the NH3 decomposition process. The experimental results showed that the reactor could achieve a 99% NH3 conversion at 773.15 K, i.e., 9% higher than that of the packed catalytic reactor (without membrane). A mathematical model of the membrane reactor was developed to explain the experimental results. The calculated activation energies (Ead) of the MXene membrane for H2 and N2 permeances were 64.95 and 69.53 kJ mol–1, respectively. The activation energy (Ear) of NH3 decomposition was 147.8 kJ mol–1. Both the experimental and modeling results showed that the membrane reactor could enhance NH3 conversion and promote the production of high-purity H2.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CLAY MINERALS
·
2024
·
IF 1.1
Qihui Wang,Xiaoli Liu,Chao Jiang,Xingpeng Wang,Linlin Wu,Huiyu Li,Weiliang Tian,Yongjun Feng
Palygorskite (Pal) shows great potential for physical, chemical and biological uses due to its colloidal, catalytic and adsorption properties. Pal mines, however, are facing the challenge of low-grade materials (5–15%), making it difficult to use Pal in emerging fields such as new materials, environmental protection and health. Therefore, there is an urgent need to develop an efficient method for separating and purifying Pal to obtain high purity levels. Hence, we have developed a dispersant-assisted rotating liquid film reactor separation strategy based on sodium hexametaphosphate as the dispersant. This strategy utilizes the double electron layer of Pal and the density difference between impurities to achieve effective disaggregation and purification of Pal bundles through the promotion of repulsive driving effects. Under optimal conditions, the purity of Pal can be increased from less than 10% to over 80%. This research presents a novel approach to the efficient refining of low-grade Pal. The crudely purified Pal’s adsorption capacity for methylene blue increased from 84.2 to 256.4 mg g–1.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Haibo Yin,Junyang Zhang,Yunlong Wang,Xiaoguang Zhao,Yakun Qu,Yue Peng,Hexing Li,Yuning Huo,Junhua Li
Photocatalytic membrane reactor (PMR), coupling photocatalysis and membrane separation , has shown a considerable potential in foulant removal. However, the serious membrane fouling and fragile membrane stability still limit the application of current PMR systems. Here, we report a strategy that PdCu alloy deposited on TiO 2 , which is incorporated with polyvinylidene fluoride membrane, achieves high humic acid (HA) rejection efficiency (100%) with enhanced membrane permeation and anti-fouling performance. Detailed characterizations demonstrate that alloying effect of PdCu-TiO 2 plays multiple roles in improving PMR performance: (1) providing the paired Pd-Cu sites for enhancing HA adsorption and transferring electrons from Pd-Cu sites to HA to improve photocatalytic HA removal; (2) inducing the photothermal effect due to the carrier damping, which directly enhances membrane permeation. The remarkable properties of PdCu-TiO 2 membrane in PMR confirm the significance of alloying effect for treating aqueous organic pollutants .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2021
·Vol. 18
·期 7
·3633
·
IF 3.39
Qianqian Lu,Nannan Zhang,Chen Chen,Miao Zhang,Dehua Zhao,Shuqing An
Lab-scale simulated biofilm reactors, including aerated reactors disturbed by short-term aeration interruption (AE-D) and non-aerated reactors disturbed by short-term aeration (AN-D), were established to study the stable-state (SS) formation and recovery after disturbance for nitrogen transformation in terms of dissolved oxygen (DO), removal efficiency (RE) of NH4+-N and NO3−-N and activity of key nitrogen-cycle functional genesamoA andnirS (RNA level abundance, per ball). SS formation and recovery of DO were completed in 0.56–7.75 h after transition between aeration (Ae) and aeration stop (As). In terms of pollutant REs, new temporary SS formation required 30.7–52.3 h after Ae and As interruptions, and seven-day Ae/As interruptions required 5.0% to 115.5% longer recovery times compared to one-day interruptions in AE-D and AN-D systems. According toamoA activity, 60.8 h were required in AE-D systems to establish new temporary SS after As interruptions, and RNAamoA copies (copy number/microliter) decreased 88.5%, while 287.2 h were required in AN-D systems, and RNAamoA copies (copy number/microliter) increased 36.4 times. FornirS activity, 75.2–85.8 h were required to establish new SSs after Ae and As interruptions. The results suggested that new temporary SS formation and recovery in terms of DO, pollutant REs andamoA andnirS gene activities could be modelled by logistic functions. It is concluded that temporary SS formation and recovery after Ae and As interruptions occurred at asynchronous rates in terms of DO, pollutant REs andamoA andnirS gene activities. Because of DO fluctuations, the quantitative relationship between gene activity and pollutant RE remains a challenge.Keywords:simulated biofilm reactor;stable state;nitrogen cycle;dissolved oxygen;gene activity
研究领域:
环境工程
·
微生物学
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Processes
·
2023
·Vol. 12
·期 1
·2
·
IF 3.5
Qingqing Wang,Yinzi Chang,Qinjie Yuan,Fenghua Wu,Hao Hu,Jiaojiao Zhang,Zhiping He
This study establishes an enzymatic membrane-coupled production process for antioxidant peptides fromCarya cathayensiscake by comparing the effects of not feeding, water feeding, substrate feeding, and gradient dilution feeding supplementary material modes, to assess their impact on production efficiency. The optimal operational conditions were determined as follows: pH 10.5, temperature 50 °C, and enzyme-to-substrate ratio of 10% (w/w). The continuous production using the gradient dilution supplementary material mode resulted in Chinese pecan antioxidant peptides with 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging rate of 0.044 mg/mL, 2, 2-azinobis-(3-ethylbenzthiazoline-6-sulfonate) (ABTS) radical scavenging rate of 0.518 mg/mL, and ferrous ion chelating ability (IC50) of 0.252 mg/mL. Compared with traditional enzymatic hydrolysis processes, the gradient dilution supplementary material enzymatic membrane-coupled production process increased peptide yield, peptide production, and unit enzyme-peptide production by 14.36%, 11.35%, and 235.63%, respectively. This continuous production method facilitates scalability, enabling the production of high-yield and high-activityCarya cathayensiscake peptides, making better use of byproducts after oil extraction, and laying a solid foundation for the comprehensive development and deep processing of Chinese pecan, thus enhancing its economic value.Keywords:enzyme membrane reactor;Carya cathayensiscake;enzyme membrane coupling process;antioxidant peptides
研究领域:
生物技术
·
食品科学
·
酶学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xiaowei Wu,Yuqin Li,Zhengquan Yang,Mingyu Peng,Tian Gui,Xiangshu Chen,Hidetoshi Kita
A beta zeolite membrane reactor was first applied to improve conversion on the esterification of oleic acid and n-butanol at low temperature by rapidly removing the by-product water. In the pervaporation (PV)-esterification at low temperature of 353 K, the final conversion of oleic acid was significantly improved to 99.2 % in a short reaction time of 4 h. Even at an incredibly low esterification temperature of 333 K, the conversion of oleic acid reached 95.7 % in 4 h. Besides, the beta zeolite membrane reactor exhibited good hydrothermal and acid stabilities with a high oleic acid conversion (maintained above 99 %) after 5 reaction cycles. Through XRD and SEM characterization, it was found that the membrane kept complete crystal structure. Process intensification through a beta zeolite membrane reactor aided by PV was successfully used to enhance the esterification at low temperature in a short time, which was a promising coupling technology.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 12
·1747
·
IF 3
Wenfeng Zai,Yangman Chen,Qingdong Qin,Xiangkun Li,Dezhao Liu
HighlightsPlasma-grafting acrylic acid composite membrane for MABR was prepared.Higher O2transfer rate and better hydrophilicity for modified membranes than pristine.Modified PVDF membrane demonstrated superior nitrogen removal during startup.Activity of denitrifying bacteria was enhanced in the modified PVDF MABR.AbstractMicroporous membranes such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) often exhibit suboptimal hydrophilicity and microbial adhesion, which impede effective nitrogen removal in membrane-aerated biofilm reactors (MABRs), particularly during initial operational phases. To address this issue, the present study introduced acrylic acid (AA) following plasma treatment (P) to enhance membrane performance, thereby engineering a novel composite material optimized for MABR applications. Four MABRs—Reactor with pristine PVDF membrane (R-PVDF), Reactor with composite PVDF membrane (R-PVDF-P-AA), Reactor with pristine PTFE membrane (R-PTFE), and Reactor with composite PTFE membrane (R-PTFE-P-AA)—were evaluated. The modified membranes displayed enhanced roughness and hydrophilicity, which improved biocompatibility and variably increased the oxygen transfer efficiency. Notably, the R-PVDF-P-AA configuration showed a significant enhancement in the removal rates of NH4+-N and total nitrogen (TN), achieving 78.5% and 61.3%, respectively, which was markedly higher than those observed with the original membranes. In contrast, the modified R-PTFE-P-AA exhibited lower removal efficiencies, with NH4+-N and TN reductions of approximately 60.0% and 49.5%. Detailed microbial community analysis revealed that the R-PVDF-P-AA membrane supported robust commensalism between ammonia-oxidizing and denitrifying bacteria, underpinning the improved performance. These findings highlight the critical role of surface chemistry and microbial ecology in optimizing the function of MABRs.
研究领域:
环境工程
·
微生物学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Abubakar Shitu,Yadong Zhang,Umar Abdulbaki Danhassan,Haijun Li,Musa Abubakar Tadda,Zhangying Ye,Songming Zhu
The moving bed bioreactor (MBBR) process has drawn more attention as a promising biological wastewater treatment process . Nevertheless, achieving quick start-up and microbial biofilm formation remains a significant challenge. Consequently, the present study investigated a novel chitosan-based natural sludge (CS@NGS) seeding strategy for the accelerated start-up of MBBR. Three identical bioreactors were employed; the first bioreactor was without sludge seed as the control (BR1), the second was inoculated only with sludge (BR2), and the third was inoculated with CS@NGS according to the proposed seeding method (BR3). All bioreactors were utilised to treat simulated recirculating aquaculture systems (RAS) effluent. Resultantly, the CS@NGS shortened the start-up period from over twenty to seven days due to the enhanced initial microbial adhesion and biofilm formation. Under optimal conditions, the ammonium removal in BR3 approached 100%, which was relatively higher than BR2 (96.35 ± 1.12%) and BR1 (92.56 ± 2.17%). Moreover, a low nitrite accumulation was exhibited in the effluents, approximately ≤0.03 mg L −1 . The process performance correlated positively with core bacteria from the genera Nakamurella , Hyphomicrobium , Nitrospira , Paenarthrobacter , Rhodococcus , and Stenotrophobacter . The quantitative polymerase chain reaction (qPCR) results demonstrated that the CS@NGS enhanced the expressions of amo A, nxr B, nir K, nir S, nar G, and nap A nitrogen metabolism-related functional genes to varying degrees. The present study findings can assist the rapid start-up of aquaculture biofilters utilised to solve high nitrite and ammonia accumulation in recirculated water from industrial RAS.
研究领域:
环境工程
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）