International Journal of Environmental Research and Public Health
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2019
·Vol. 16
·期 19
·3609
·
IF 2.468
Xiaoying Zheng,Yuan Zhang,Wei Chen,Weihong Wang,Hang Xu,Xiaoyao Shao,Mengmeng Yang,Zhi Xu,Linghua Zhu
Due to the increased use of cerium oxide nanoparticles (CeO2NPs), their potential environmental risks have caused concern. However, their effects on the aerobic granular sludge (AGS) process and the later recovery of AGS are still unclear. In this study, we comprehensively determined the changes in pollutant removal and the levels of extracellular polymeric substances (EPS) in AGS that were exposed to CeO2NP treatments (0 (the control, R0), 1 (R1), and 5 (R5) mg/L), following an increase in the influent chemical oxygen demand (COD). An increase in the CeO2NP concentration enhanced their inhibitory effect on the removal of total nitrogen (TN) and total phosphorus (TP), and promoted the production of polysaccharides (PS) and proteins (PN) in loosely bound EPS (LB-EPS) or tightly bound EPS (TB-EPS), as well as the dissolved organic carbon (DOC) components in EPS, but had no long-term effects on the removal of organic matter. When the addition of CeO2NPs was stopped and the concentration of influent COD increased, the TN and TP removal efficiencies in R1 and R5 slowly increased and recovered. In R1, they were only 4.55 ± 0.55% and 2.71 ± 0.58% lower than in R0, respectively, while the corresponding values for R5 were 5.06 ± 0.46% and 6.20 ± 0.63%. Despite the LB-EPS and TB-EPS concentrations in the R1 and R5 treatments recovering and being similar to the levels in the control when no CeO2NPs were added, they were still slightly higher than in the R0, which indicating that the negative effects of CeO2NPs could not be completely eliminated due to the residual CeO2NP levels in AGS.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Chao Wu,Xiaokang Na,Wuchao Ma,Chao Ren,Qixin Zhong,Tao Wang,Ming Du
High internal phase emulsions (HIPEs) are versatile platforms for various applications owing to the low-density, interconnected structure, and large specific area. The mechanical properties of existing HIPEs, especially those stabilized solely by one naturally-occurring substance, hinder their practical applications. In this study, we disclose strong (up to 1.6 MPa), tough (up to 0.7 MJ m −3 ), and fatigue-resistant HIPEs stabilized solely by cod myofibers (CMs). Unlike conventional Pickering-type HIPEs, intrinsic strengthening and toughening of CMs, resultant from cadmium bridging of actin and myosin, endow the superior mechanical properties of our HIPEs. The HIPEs are conformable to 3D printing, yielding architectures with tailorable rheological properties that are vital for texture of foods. Besides, the network structures of our HIPEs serve the template of aerogels that had the oil absorption capacity of up to 58 g g −1 and maintained properties after repeated uses. The ability of aerogels to absorb petroleum or soy oil spilled on down feathers within 40 s shows the potential applications in fabric cleansing and remediation of oil spillage including rescuing seabirds. Furthermore, the porous structures of aerogels are excellent platforms for osteoblast attachment and proliferation and therefore are potential scaffolds in tissue engineering. The mechanically robust, reusable, and biofriendly HIPEs in this study can be developed as facile and reusable materials for numerous multidisciplinary applications.
研究领域:
食品科学
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材料科学
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环境科学
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生物医学工程
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高影响因子
FOOD HYDROCOLLOIDS
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2021
·
IF 9.147
Yisha Xie,Xiliang Yu,Zheming Wang,Chenxu Yu,Sangeeta Prakash,Xiuping Dong
In this paper, the synergistic effect of myofibrillar protein enrichment and homogenization on the quality of cod protein gel (CP-gel) was investigated. CP-gel properties were characterized through measuring the gel strength, rheological properties, water retention and the protein network structure. The results showed that myofibrillar protein was enriched after washing the steamed cod for more than three times. With the synergistic effects of homogenization and myofibrillar protein enrichment, CP-gel with 1:3 of solid: water ratio was produced, which had similar texture properties with the regular CP-gel (with 1:1 of solid: water ratio), and had better gel strength, storage modulus, and water holding capacity than the control (i.e., with no enrichment/homogenization treatments). Clearly, the combined protein enrichment and homogenization treatments pointed to a new CP-gel production method which would significantly increase the production yield and reduce the production costs without negatively impact the product quality. In addition, the CP-gel with thixotropy and shear-thinning behavior was suitable for extrusion-based 3-D printing, which could be utilized to develop custom-made designer specialty food with further enhanced nutritional and flavor/textual properties.
研究领域:
食品科学
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蛋白质工程
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DOI
高影响因子
Journal of Water Process Engineering
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2022
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IF 7.34
Lilong Zhou,Shenghao Wang,Zhengjie Li,Xuepu Cao,Runjing Liu,Jimmy Yun
Organic phosphorous wastewater is very hard to be purified which need to remove both COD and phosphorous. The treatment process of organic phosphorous wastewater is commonly complicated. In this work, CaO has been used as the catalyst and precipitant for the treatment of organophosphorus wastewater by catalytic ozonation . Compared with CeO 2 , MnO 2 and MgO, CaO shows excellent catalytic performance for the removal of COD. Additionally, the generated PO 3 3− can be removed by Ca 2+ . Ca 2+ can catalyze the reaction between O 3 and H 2 O to generate active oxygen species, such as • OH, - • O 2 , 1 O 2 . Besides, various conditions, namely, amount of catalyst, O 3 flow rate, substrate concentration and pH for the degradation of Tetrakis Hydroxymethyl Phosphonium Sulfate (THPS) wastewater by catalytic ozonation over CaO have been optimized to determine the optimal parameter conditions. Finally, the excess Ca 2+ in the solution can be removed by the addition of CO 2 .
研究领域:
环境工程
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化学工程
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废水处理
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Wuchao Ma,Meilian Yang,Di Wu,Yao Li,Li-Shu Wang,Hesham R. El-Seedi,Chao Wu,Ming Du
Loading bioactive molecules, such as proteins and peptides, into hydrogels is a promising strategy to expand the application of hydrogels in tissue engineering. Herein, a novel bioactive gelatin hydrogel loading peptide derived from Atlantic cod (Gadus morhua) was developed for bone tissue engineering, which was constructed on the NaIO 4 -mediated oxidative coupling of dopamine-modified gelatin (Gel-DA). The Gel-DA hydrogel incorporated with cod peptides (0.5 mg/mL) showed an acceptable gelation time (130.22 ± 7.15 s) and maintained a continuous microscopic pore structure . Besides, the compression strength and adhesive strength of Gel-DA hydrogel with 0.5 mg/mL cod peptides reached 136.33 ± 38.95 kPa and 4.93 ± 0.80 kPa, respectively. Meanwhile, all hydrogels exhibited excellent mechanical stability. The incorporation of cod peptides (0.1, 0.5 mg/mL) was beneficial to the adhesion and spreading of mouse osteoblasts precursor cells MC3T3-E1. Moreover, the alkaline phosphatase (ALP) activity of the Gel-DA hydrogel loading 0.5 mg/mL peptides was significantly increased from 0.16 ± 0.02 U.mg/protein to 0.19 ± 0.02 U.mg/protein as compared to Gel-DA hydrogel. These results indicated that the GD-CPs hydrogel is an effective candidate material for bone tissue engineering.
研究领域:
生物材料
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组织工程
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生物医学工程
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高影响因子
WATER ENVIRONMENT RESEARCH
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2024
·Vol. 96
·期 6
·e11058
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IF 2.5
Wenquan Sun,Yueqian Cheng,Zhiqiang Xiao,Jun Zhou,Kinjal J. Shah,Yongjun Sun
Ni-Mn@KL ozone catalyst was prepared for the efficient treatment of reverse osmosis membrane concentrates. The working conditions and reaction mechanism of the ozone-catalyzed oxidation by Ni-Mn@KL were systematically studied. Then, a comprehensive CRITIC weighting–coupling coordination evaluation model was established. Ni-Mn@KL was characterized by scanning electron microscopy, BET, X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive spectrometry, and X-ray fluorescence spectrometry and found to have large specific surface area and homogeneous surface dispersion of striped particles. Under the optimum working conditions with an initial pH of 7.9 (raw water), a reaction height-to-diameter ratio of 10:1, an ozone-aeration intensity of 0.3 L/min, and a catalyst filling rate of 10%, the maximum COD removal rate was 60.5%. Free-radical quenching experiments showed that OH oxidation played a dominant role in the Ni-Mn@KL-catalyzed ozone-oxidation system, and the reaction system conformed to the second-order reaction kinetics law. Ni-Mn@KL catalysts were further confirmed to have good catalytic performance and mechanical performance after repeated utilization. Practitioner Points Ni-Mn@KL catalyst can achieve effective treatment of RO film concentrated liquid. High COD removal rate of RO membrane concentrated liquid was obtained at low cost. Ni-Mn@KL catalyst promotes ozone decomposition to produce ·OH and O 2 − · oxidized organic matter. The Ni-Mn@KL catalyst can maintain good stability after repeated use. A CRITIC weight–coupling coordination model was established to evaluate the catalytic ozonation.
研究领域:
环境工程
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化学工程
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产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2013
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IF 4.75
Feifei Hou,Baoan Li,Minghao Xing,Qin Wang,Liang Hu,Shichang Wang
A novel composite hollow fiber membrane for membrane aerated biofilm rector (MABR) was prepared by coating L-3,4-dihydroxyphenylalanine (DOPA) on the surface of PVDF membrane. MABR process study was conducted to test the performances of the original and modified membranes for 166 days. The results indicate that coated membrane showed 2 times higher gas flux, lower water contact angle (declined from 86.5° to 52°), and significantly improved surface roughness. The modified membrane displayed an excellent MABR performance. Its COD, NH 4 + –N and TN removal efficiencies were kept above 90%, 98.8% and 84.2% during the first 4-month experiment. By tracking experiment at 0.01 MPa, to achieve COD removal efficiency of 85.9%, half an hour is required with the modified membrane, instead of 6 h using the original one. Besides, faster NH 4 + –N and TN removal at 0.01 MPa were also achieved with DOPA composite membrane.
研究领域:
环境工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Nanomaterials
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2016
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IF 1.758
Yongli Zhang,Shujuan Dai,Yanbo Zhou,Kai Lin
Fe-Co-Ce composite catalysts were prepared by coprecipitation method using CO(NH2)2, NaOH, NH4HCO3, and NH3·H2O as precipitant agents. The effects of the precipitant agents on the physicochemical properties of the Fe-Co-Ce based catalysts were investigated by SEM, TEM, BET, TG-DTA, and XRD. It was found that the precipitant agents remarkably influenced the morphology and particle size of the catalysts and affected the COD removal efficiency, decolorization rate, and pH of methyl orange for catalytic wet air oxidation (CWAO). The specific surface area of the Fe-Co-Ce composite catalysts successively decreased in the order of NH3·H2O, NH4HCO3, NaOH, and CO(NH2)2, which correlated to an increasing particle size that increased for each catalyst. For the CWAO of a methyl orange aqueous solutions, the effects of precipitant agents NH3·H2O and NaOH were superior to those of CO(NH2)2 and NH4HCO3. The catalyst prepared using NH3·H2O as the precipitant agent was mostly composed of Fe2O3, CoO, and CeO2. The COD removal efficiency of methyl orange aqueous solution for NH3·H2O reached 92.9% in the catalytic wet air oxidation. Such a catalytic property was maintained for six runs.
研究领域:
化学工程
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环境科学
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Qidi Liu,Jun Hou,Jun Wu,Lingzhan Miao,Guoxiang You,Yanhui Ao
The inefficiency of conventional biological treatment for removing sulfamethoxazole (SMX) is posing potential risks to ecological environments. In this study, an intimately coupled photocatalysis and biodegradation (ICPB) system consisting of Fe 3+ /g-C 3 N 4 and biofilm was fabricated for the treatment of synthetic domestic wastewater containing SMX. The results showed that this ICPB system could simultaneously remove 96.27 ± 5.27% of SMX and 86.57 ± 3.06% of COD, which was superior to sole photocatalysis (SMX 100%, COD 4.2 ± 0.74%) and sole biodegradation (SMX 42.21 ± 0.86%, COD 95.1 ± 0.18%). Contributors to SMX removal in the ICPB system from big to small include LED photocatalysis, biodegradation, LED photolysis, and adsorption effect of the carrier, while COD removal was largely ascribed to biodegradation. Increasing initial SMX concentration inhibits SMX removal rate, while increasing photocatalyst dosage accelerates SMX removal rate, and both had no impact on COD removal. Our analysis of biofilm activity showed that microorganisms in this ICPB system maintained a high survival rate and metabolic activity, and the microbial community structure of the biofilm remained stable, with Nakamurella and Raoultella being the two dominant genera of the biofilm. This work provides a new strategy to effectively treat domestic wastewater polluted by antibiotics.
研究领域:
环境工程
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水处理
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微生物学
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催化
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DOI
PubMed
高影响因子
WATER SCIENCE AND TECHNOLOGY
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2020
·Vol. 82
·期 5
·843-850
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IF 1.638
Fan Peipei,Zhang Lin,Liu Zongjian,Zhang Weidong,Cui Qun,Wang Haiyan
Qualitative and quantitative analysis of trace organics in the condensate and its correlation with chemical oxygen demand (COD) is the key to the research on the reuse technology of condensate (condensate) from natural gas to hydrogen production process. The contents of anions, COD, total organic carbon (TOC) and total nitrogen (TN) were measured by ion chromatography and the TOC analyzer. Trace organics in the condensate and its correlation with COD was investigated in this paper. Results show that the contents of COD and TOC is 74.1 and 17.81 mg/L, respectively, and the anions in the condensate are mainly Cl − , I − , and , etc. The condensate mainly contains small molecule organics including methanol, ethanol and formic acid with the content of 41.4, 2.1 and 3.2 mg/L, respectively. The spiked recovery of methanol, ethanol and formic acid is 96.1%, 100.2% and 103.9% by high performance liquid chromatography (HPLC) and gas chromatography (GC), respectively. Methanol is the main source of COD in the condensate, and the contribution rate reaches up to 83.8%. The removal of trace methanol can significantly reduce the COD of the condensate. This work might provide basic data for reasonable recovery and utilization of condensate in the hydrogen production process. Quantitative analysis of trace organics in the condensate is the key to their deep purification. Correlation between trace organics and COD was investigated. Trace organics in the condensate are methanol, ethanol and formic acid. The contribution rate of methanol for COD reaches up to 83.8%. The removal of organics can significantly reduce the COD of the condensate.
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高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Shiva Pandeya,Rui Ding,Yufei Ma,Xuling Han,Meixing Gui,Purnima Mulmi,Khim Prasad Panthi,Bhanu Bhakta Neupane,Hem Raj Pant,Ziliang Li,Mahesh Kumar Joshi
The self-standing TiO 2 nanofiber-based heterojunction with excellent visible-light-driven photocatalytic activity, antimicrobial activity, and reusability holds great importance in water and airborne pollutant management. Herein, a series of splendid flexible CdS/TiO 2 (CdS/TZ) nanofibrous membranes (NFMs) were fabricated by facile post-electrospinning treatment. The self-standing TiO 2 NFM was first prepared via the electrospinning technique followed by controlled calcination, and then the CdS nanoparticles (NPs) were grown by the successive ionic layer adsorption and reaction (SILAR) method. The careful deposition of CdS NPs preserved the self-standing properties of the TiO 2 membrane. The amount of CdS NPs in the CdS/TiO 2 membrane was tailored by varying the SILAR cycles. The CdS/TiO 2 heterojunction demonstrated superior antimicrobial efficacy against both Gram-positive and Gram-negative bacteria. Additionally, it enhanced the photocatalytic degradation of the methyl orange and effectively removed oxidizable impurities from pharmaceutical effluent while maintaining good recycling capacity. The photocatalytic degradation of methyl orange obeyed the pseudo-first-order reaction dynamics model and showed a strong influence of the CdS amount on the degradation. The maximum degradation rate for methyl orange dye using the CdS/TiO 2 Janus membrane was 0.057 min −1 , which was 3.5 times that of the TiO 2 membrane. The degradation efficiency of CdS/ TiO 2 was found to be up to 96.8% in 60 minutes and showed excellent photocatalytic activity in five consecutive cycles. The chemical oxygen demand (COD) removal efficiency for the TiO 2 membrane was 74.16, which was increased to 91.66% for the CdS/TiO 2 membrane. This study provides insight into developing highly efficient Janus inorganic nanofiber with superior structural integrity for waste water treatment and environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Wei Qian,Hui Huang,Zenghui Diao,Huankai Li,Hui Liu,Maoyou Ye,Yili Deng,Zhimin Xu
The deposal of residual hydrogen peroxide (H 2 O 2 ) in Fenton-like system and the requirement of oxygen in bioreactor are essential parts for the treatment of integrative Fenton-like/bioreactor. A novel low-cost integrative Fenton-like and MnO 2 -filled upward flow biological filter bed (Fenton-like/MBFB) equipped with the modified ceramsite was constructed to evaluate the main properties and catalytic activity of modified ceramsite, and the optimal conditions of integrative system and compare integrative and traditional systems. In this study, the Fenton-like reactor with modified ceramsite had higher catalytic ability whose Acid Orange 7 (AO7) degradation efficiency reached to 79.3% due to large surface area and high porosity, compared with that with raw ceramsite (44.3%). Furthermore, total utilization efficiency of H 2 O 2 in integrative system (from 32.41% to 53.51%) and removal efficiencies of COD and AO7 were remarkably improved, which would effectively decrease the waste of H 2 O 2 and the setting of regulation pool and aeration tank. Thus, the integrative system can save 0.51 CNY/m 3 in construction cost and 0.21 CNY/m 3 in operating cost. The average COD removal efficiency, AO7 degradation efficiency and effluent DO concentration were achieved to 64.8%, 79.5% and 9.3 mg/L respectively in integrative system were achieved in integrative system during sixty successive runs. Also, the potential degradation pathway of contaminants was also proposed according to the OH-enhanced at Fenton-like reactor due to catalyst and adsorption of modified ceramsite and the removal of microorganisms and modified ceramsite for contaminants at MBFB. This study demonstrated the feasibility of integrative Fenton-like/MBFB filled with modified ceramsite for simultaneously decreasing operational cost and complexity and enhancing removal efficiency, thus provided a one-step alternative for refractory dye wastewater.
研究领域:
环境科学
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污水处理
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DOI
高影响因子
危险品化学品经营许可证（带存储）