Water science and engineering最新文献_第7页

Survey on performance of vertical slot and nature-like fishways at Angu hydropower station, Southwest China 中国西南安谷水电站竖槽和仿自然鱼道性能调查

IF 4

Water science and engineering Pub Date : 2023-09-28 DOI: 10.1016/j.wse.2023.09.007

Jun-jian Sun , Jia-yue Shi , Qi Zhang , Xiao-tao Shi , Jun-jun Tan

{"title":"Survey on performance of vertical slot and nature-like fishways at Angu hydropower station, Southwest China","authors":"Jun-jian Sun , Jia-yue Shi , Qi Zhang , Xiao-tao Shi , Jun-jun Tan","doi":"10.1016/j.wse.2023.09.007","DOIUrl":"10.1016/j.wse.2023.09.007","url":null,"abstract":"<div><p>To restore dam-blocked natural fish migratory passages, a growing number of artificial fishways have been built in water conservancy and hydropower projects in China. The Angu hydropower station involved diverse important fish habitats in the lower reaches of the Daduhe River in Southwest China. Therefore, a vertical slot fishway (VSF) and a nature-like fishway (NLF) were built near the backwater area of the reservoir to connect the upstream and downstream habitats. Hydrodynamic and aquatic ecological surveys were conducted after the completion of the project to estimate the fish passing effect of the two fishways. The results indicated that both fishways were in effective operation and could maintain the desired hydrodynamic conditions and be used by several local fish species. During the survey, 149 fish from 15 species and 111 fish from 17 species were captured by the traps in the VSF and NLF, respectively, while 1 263 fish from 27 species were found in the downstream area. Some species captured in the VSF were not found in the NLF, and vice versa, which implied the different preferences of fish. Meanwhile, 3 789 signals including 2 099 upward ones and 1 690 downward ones were monitored with an ultrasonic fish detector at the inlet of the VSF. These findings revealed the characteristics of fish species observed in and near the fishways and provided valuable insights into the different fish passing capabilities of VSF and NLF.</p></div>","PeriodicalId":23628,"journal":{"name":"Water science and engineering","volume":"17 1","pages":"Pages 83-91"},"PeriodicalIF":4.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1674237023000911/pdfft?md5=016ce0123faa33dd85f3a49e4a38a440&pid=1-s2.0-S1674237023000911-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134994418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deformation prediction model of concrete face rockfill dams based on an improved random forest model 基于改进随机森林模型的面板堆石坝变形预测模型

IF 4

Water science and engineering Pub Date : 2023-09-17 DOI: 10.1016/j.wse.2023.09.005

Yan-long Li , Qiao-gang Yin , Ye Zhang , Heng Zhou

{"title":"Deformation prediction model of concrete face rockfill dams based on an improved random forest model","authors":"Yan-long Li , Qiao-gang Yin , Ye Zhang , Heng Zhou","doi":"10.1016/j.wse.2023.09.005","DOIUrl":"10.1016/j.wse.2023.09.005","url":null,"abstract":"<div><p>The unique structure and complex deformation characteristics of concrete face rockfill dams (CFRDs) create safety monitoring challenges. This study developed an improved random forest (IRF) model for dam health monitoring modeling by replacing the decision tree in the random forest (RF) model with a novel M5' model tree algorithm. The factors affecting dam deformation were preliminarily selected using the statistical model, and the grey relational degree theory was utilized to reduce the dimensions of model input variables. Finally, a deformation prediction model of CFRDs was established using the IRF model. The ten-fold cross-validation method was used to quantitatively analyze the parameters affecting the IRF algorithm. The performance of the established model was verified using data from three specific measurement points on the Jishixia dam and compared with other dam deformation prediction models. At point ES-10, the performance evaluation indices of the IRF model were superior to those of the M5' model tree and RF models and the classical support vector regression (SVR) and back propagation (BP) neural network models, indicating the satisfactory performance of the IRF model. The IRF model also outperformed the SVR and BP models in settlement prediction at points ES2-8 and ES4-10, demonstrating its strong anti-interference and generalization capabilities. This study has developed a novel method for forecasting and analyzing dam settlements with practical significance. Moreover, the established IRF model can also provide guidance for modeling health monitoring of other structures.</p></div>","PeriodicalId":23628,"journal":{"name":"Water science and engineering","volume":"16 4","pages":"Pages 390-398"},"PeriodicalIF":4.0,"publicationDate":"2023-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1674237023000893/pdfft?md5=a45fcb03b9b568051acd6e9b18b3b8b2&pid=1-s2.0-S1674237023000893-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135348056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Green synthesis of silver nanoparticles using aqueous leaf extract of Saussurea obvallata for efficient catalytic reduction of nitrophenol, antioxidant, and antibacterial activity 利用荞麦叶水提取物绿色合成银纳米粒子，用于高效催化还原硝基苯酚、抗氧化和抗菌活性

IF 4

Water science and engineering Pub Date : 2023-09-15 DOI: 10.1016/j.wse.2023.09.004

P.S.R. Vidya Sagar , Dharmasoth Ramadevi , Keloth Basavaiah , Sathish Mohan Botsa

{"title":"Green synthesis of silver nanoparticles using aqueous leaf extract of Saussurea obvallata for efficient catalytic reduction of nitrophenol, antioxidant, and antibacterial activity","authors":"P.S.R. Vidya Sagar , Dharmasoth Ramadevi , Keloth Basavaiah , Sathish Mohan Botsa","doi":"10.1016/j.wse.2023.09.004","DOIUrl":"10.1016/j.wse.2023.09.004","url":null,"abstract":"<div><p>Of several noble metal nanoparticles, silver nanoparticles (AgNPs) have attracted special attention due to their distinct properties, such as favorable electrical conductivity, chemical stability, and catalytic and antibacterial activities. Green synthesis of AgNPs using plant extracts containing phytochemical agents has attracted considerable interest. This environmentally friendly approach is more biocompatible and cost-efficient and has the capability of supporting large-scale synthesis. This study developed an eco-friendly method for the preparation of AgNPs using the aqueous leaf extract of <em>Saussurea obvallata</em> as reducing and capping agents. Ultraviolet visible spectroscopy (UV–Vis), Fourier transform infrared spectroscopy (FTIR), Raman, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses were conducted to characterize the synthesized AgNPs. The morphology of AgNPs was found to be spherical with an average crystallite size of 12 nm and a maximum absorbance at 410 nm. 10 mg of AgNPs had potential to reduce 4-nitrophenol to 4-aminophenol in 16 min and exhibited strong biological activities against the Gram-negative bacteria <em>Escherichia coli</em> (12 mm) and Gram-positive bacteria <em>Enterococcus faecalis</em> (13 mm). The antioxidant activity of the synthesized AgNPs was investigated against the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and exhibited up to 61.21% ± 0.02% at an AgNPs concentration of 500 μg/mL.</p></div>","PeriodicalId":23628,"journal":{"name":"Water science and engineering","volume":"17 3","pages":"Pages 274-282"},"PeriodicalIF":4.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1674237023000881/pdfft?md5=0fa350e2b7c0dc10dd24b8c3602d54c8&pid=1-s2.0-S1674237023000881-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135347796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrahydrophobic melamine sponge via interfacial modification with reduced graphene oxide/titanium dioxide nanocomposite and polydimethylsiloxane for oily wastewater treatment 通过还原氧化石墨烯/二氧化钛纳米复合材料和聚二甲基硅氧烷的界面改性实现超疏水性三聚氰胺海绵，用于含油废水处理

IF 4

Water science and engineering Pub Date : 2023-09-14 DOI: 10.1016/j.wse.2023.09.003

Hamidatu Alhassan , Ying Woan Soon , Anwar Usman , Voo Nyuk Yoong

{"title":"Ultrahydrophobic melamine sponge via interfacial modification with reduced graphene oxide/titanium dioxide nanocomposite and polydimethylsiloxane for oily wastewater treatment","authors":"Hamidatu Alhassan , Ying Woan Soon , Anwar Usman , Voo Nyuk Yoong","doi":"10.1016/j.wse.2023.09.003","DOIUrl":"10.1016/j.wse.2023.09.003","url":null,"abstract":"<div><p>Three-dimensional (3D) porous absorbents have attracted significant attention in the oily wastewater treatment technology due to their high porosity and elasticity. Given their amphiphilic surface, they have a propensity to simultaneously absorb water and oil, which restricts their range of applications. In this study, a reduced graphene oxide and titanium dioxide nanocomposite (rGO/TiO<sub>2</sub>) was used to fabricate an ultrahydrophobic melamine sponge (MS) through interfacial modification using a solution immersion technique. To further modify it, polydimethylsiloxane (PDMS) was grafted onto its surface to establish stronger covalent bonds with the composite. The water contact angle of the sponge (rGO/TiO<sub>2</sub>/PDMS/MS) was 164.2°, which satisfies the condition for ultrahydrophobicity. The evidence of its water repellency was demonstrated by the Cassie–Baxter theory and the lotus leaf effect. As a result of the increased density of rGO/TiO<sub>2</sub>/PDMS/MS, it recorded an initial capacity that was 2 g/g lower than the raw MS for crude oil absorption. The raw MS retained 53% of its initial absorption capacity after 20 cycles of absorption, while rGO/TiO2/PDMS/MS retained 97%, suggesting good recyclability. Excellent oil and organic solvent recovery (90%–96%) was demonstrated by rGO/TiO<sub>2</sub>/PDMS/MS in oil–water combinations. In a continuous separation system, it achieved a remarkable separation efficiency of 2.4 × 10<sup>6</sup> L/(m<sup>3</sup>·h), and in turbulent emulsion separation, it achieved a demulsification efficiency of 90%–91%. This study provides a practical substitute for massive oil spill cleaning.</p></div>","PeriodicalId":23628,"journal":{"name":"Water science and engineering","volume":"17 2","pages":"Pages 139-149"},"PeriodicalIF":4.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S167423702300087X/pdfft?md5=933683b739b29ebd3a690e5b891689d5&pid=1-s2.0-S167423702300087X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135889106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deformation warning index for reinforced concrete dam based on structural health monitoring data and numerical simulation 基于结构健康监测数据和数值模拟的钢筋混凝土大坝变形预警指标

IF 4

Water science and engineering Pub Date : 2023-09-10 DOI: 10.1016/j.wse.2023.09.002

Ming-qiang Zhan , Bo Chen , Zhong-ru Wu

{"title":"Deformation warning index for reinforced concrete dam based on structural health monitoring data and numerical simulation","authors":"Ming-qiang Zhan , Bo Chen , Zhong-ru Wu","doi":"10.1016/j.wse.2023.09.002","DOIUrl":"10.1016/j.wse.2023.09.002","url":null,"abstract":"<div><p>The material mechanical parameters of the dam body and foundation will change when a dam is reinforced during the aging process. This causes significant changes in the structural state of the project and makes it difficult to ensure its structural safety. In this study, a new deformation warning index for reinforced concrete dams was developed according to the prototype monitoring data, statistical models, three-dimensional finite element model (FEM) numerical simulation, and the critical conditions of the dam structure. A statistical model was established to separate the water pressure component. Then, a three-dimensional FEM of the reinforced concrete dam was constructed to simulate the water pressure component. Furthermore, the deformation components that affected the mechanical parameters of the dam under the same amount of reservoir water level change were separated and quantified accurately. In addition, the method for inversion of comprehensive mechanical parameters after dam reinforcement was used. The influence mechanisms of the deformation behavior of concrete dams under the reservoir water level and temperature changes were investigated. A new deformation warning index was developed by combining the forward-simulated critical water pressure component and temperature component in the period of extreme temperature decrease with the aging component separated by the statistical model. The new deformation warning index considers the structural state of the dam before and after reinforcement and links the structural strength criterion and the deformation evolution mechanisms. It provides a theoretical foundation and decision support for long-term service and operation management of reinforced dams.</p></div>","PeriodicalId":23628,"journal":{"name":"Water science and engineering","volume":"16 4","pages":"Pages 408-418"},"PeriodicalIF":4.0,"publicationDate":"2023-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1674237023000868/pdfft?md5=cf4a5484d5f7e1036a90e0ee577432fa&pid=1-s2.0-S1674237023000868-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135248601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rockfill material uncertainty inversion analysis of concrete-faced rockfill dams using stacking ensemble strategy and Jaya optimizer 基于叠加集成策略和Jaya优化器的面板堆石坝堆石料不确定性反演分析

IF 4

Water science and engineering Pub Date : 2023-09-07 DOI: 10.1016/j.wse.2023.09.001

Qin Ke , Ming-chao Li , Qiu-bing Ren , Wen-chao Zhao

{"title":"Rockfill material uncertainty inversion analysis of concrete-faced rockfill dams using stacking ensemble strategy and Jaya optimizer","authors":"Qin Ke , Ming-chao Li , Qiu-bing Ren , Wen-chao Zhao","doi":"10.1016/j.wse.2023.09.001","DOIUrl":"10.1016/j.wse.2023.09.001","url":null,"abstract":"<div><p>Numerical simulation of concrete-faced rockfill dams (CFRDs) considering the spatial variability of rockfill has become a popular research topic in recent years. In order to determine uncertain rockfill properties efficiently and reliably, this study developed an uncertainty inversion analysis method for rockfill material parameters using the stacking ensemble strategy and Jaya optimizer. The comprehensive implementation process of the proposed model was described with an illustrative CFRD example. First, the surrogate model method using the stacking ensemble algorithm was used to conduct the Monte Carlo stochastic finite element calculations with reduced computational cost and improved accuracy. Afterwards, the Jaya algorithm was used to inversely calculate the combination of the coefficient of variation of rockfill material parameters. This optimizer obtained higher accuracy and more significant uncertainty reduction than traditional optimizers. Overall, the developed model effectively identified the random parameters of rockfill materials. This study provided scientific references for uncertainty analysis of CFRDs. In addition, the proposed method can be applied to other similar engineering structures.</p></div>","PeriodicalId":23628,"journal":{"name":"Water science and engineering","volume":"16 4","pages":"Pages 419-428"},"PeriodicalIF":4.0,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1674237023000856/pdfft?md5=300479ee263dbccd562d92bc410cb890&pid=1-s2.0-S1674237023000856-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41511913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficiency and effectiveness of systems for the treatment of domestic wastewater based on subsurface flow constructed wetlands in Jarabacoa, Dominican Republic 多米尼加共和国Jarabacoa地下流人工湿地处理生活污水系统的效率和效果

IF 4

Water science and engineering Pub Date : 2023-09-04 DOI: 10.1016/j.wse.2023.08.004

Yvelisse Pérez , Enmanuel Vargas , Daniel García-Cortés , William Hernández , Humberto Checo , Ulises Jáuregui-Haza

{"title":"Efficiency and effectiveness of systems for the treatment of domestic wastewater based on subsurface flow constructed wetlands in Jarabacoa, Dominican Republic","authors":"Yvelisse Pérez , Enmanuel Vargas , Daniel García-Cortés , William Hernández , Humberto Checo , Ulises Jáuregui-Haza","doi":"10.1016/j.wse.2023.08.004","DOIUrl":"10.1016/j.wse.2023.08.004","url":null,"abstract":"<div><p>Constructed wetlands (CW) are well known nature-based systems for water treatment. This study evaluated the efficiency and effectiveness of seven domestic wastewater treatment systems based on horizontal flow CWs in Jarabacoa, the Dominican Republic. The results showed that the CWs were efficient in reducing the degree of contamination of wastewater to levels below the Dominican wastewater discharge standards for parameters such as the 5-day biochemical oxygen demand (BOD5) and chemical oxygen demand, but not for the removal of phosphorus and fecal coliforms. In addition, a horizontal flow subsurface wetland in the peri-urban area El Dorado was evaluated in terms of the performance of wastewater treatment in tropical climatic conditions. The concentrations of heavy metals, such as zinc, copper, chromium, and iron, were found to decrease in the effluent of the wetland, and the concentrations for nickel and manganese tended to increase. The levels of heavy metals in the effluent were lower than the limit values of the Dominican wastewater discharge standards. The construction cost of these facilities was around 200 USD per population equivalent, similar to the cost in other countries in the same region. This study suggested some solutions to the improved performance of CWs: selection of a microbial flora that guarantees the reduction of nitrates and nitrites to molecular nitrogen, use of endemic plants that bioaccumulate heavy metals, combination of constructed wetlands with filtration on activated carbon, and inclusion of water purification processes that allow to evaluate the reuse of treated water.</p></div>","PeriodicalId":23628,"journal":{"name":"Water science and engineering","volume":"17 2","pages":"Pages 118-128"},"PeriodicalIF":4.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1674237023000820/pdfft?md5=9829d8165dec934492f98ef0c7395a0b&pid=1-s2.0-S1674237023000820-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41316859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and application of Ag–Ce–O composite metal oxide catalyst in catalytic ozonation for elimination of Reactive Black 5 dye from aqueous media Ag-Ce-O复合金属氧化物催化剂的制备及其在臭氧氧化去除水中活性黑5染料中的应用

IF 4

Water science and engineering Pub Date : 2023-09-01 DOI: 10.1016/j.wse.2023.08.005

Nikita P. Chokshi, Abhi Chauhan, Rahul Chhayani, Sandip Sharma, Jayesh P. Ruparelia

{"title":"Preparation and application of Ag–Ce–O composite metal oxide catalyst in catalytic ozonation for elimination of Reactive Black 5 dye from aqueous media","authors":"Nikita P. Chokshi, Abhi Chauhan, Rahul Chhayani, Sandip Sharma, Jayesh P. Ruparelia","doi":"10.1016/j.wse.2023.08.005","DOIUrl":"10.1016/j.wse.2023.08.005","url":null,"abstract":"<div><p>It is necessary to treat textile effluents before discharging them into natural water bodies as they harm the environment. Compared to conventional treatment methods, catalytic ozonation has gained attention due to its effectiveness in removing refractory organic pollutants. In this study, the coprecipitation method was used to synthesize a composite metal oxide of silver and cerium oxide, and the synthesized catalyst was used to eliminate the Reactive Black 5 (RB5) dye. X-ray diffraction, scanning electron microscopic, and Brunauer–Emmett–Teller surface area analyses were performed to characterize the synthesized catalyst. Afterwards, relevant experimental parameters, such as pH, ozone and catalyst dosages, and initial dye concentration, were investigated. The experiments revealed that the optimal experimental conditions were a pH value of 10, a catalyst dosage of 0.7 g/L, and an ozone dosage of 60 L/h. In these optimized conditions, the RB5 dye was entirely removed, and a chemical oxygen demand removal efficiency of 88% was achieved within a reaction time of 80 min. Furthermore, the recycling potential of the catalyst was tested for three cycles, and no deterioration in its activity was observed. Additionally, studies were conducted using a hydroxyl radical scavenger in order to understand the reaction pathway of the system. As a result, the indirect pathway was more dominant than the direct pathway in the system.</p></div>","PeriodicalId":23628,"journal":{"name":"Water science and engineering","volume":"17 3","pages":"Pages 257-265"},"PeriodicalIF":4.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1674237023000832/pdfft?md5=4e3d981aca9029f136ebff783e53cab1&pid=1-s2.0-S1674237023000832-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48904501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient degradation of dye pollutants in wastewater via photocatalysis using a magnetic zinc oxide/graphene/iron oxide-based catalyst 磁性氧化锌/石墨烯/氧化铁基催化剂光催化高效降解废水中的染料污染物

IF 4

Water science and engineering Pub Date : 2023-09-01 DOI: 10.1016/j.wse.2023.01.004

Piyawan Nuengmatcha , Arnannit Kuyyogsuy , Paweena Porrawatkul , Rungnapa Pimsen , Saksit Chanthai , Prawit Nuengmatcha

{"title":"Efficient degradation of dye pollutants in wastewater via photocatalysis using a magnetic zinc oxide/graphene/iron oxide-based catalyst","authors":"Piyawan Nuengmatcha , Arnannit Kuyyogsuy , Paweena Porrawatkul , Rungnapa Pimsen , Saksit Chanthai , Prawit Nuengmatcha","doi":"10.1016/j.wse.2023.01.004","DOIUrl":"10.1016/j.wse.2023.01.004","url":null,"abstract":"<div><p>In this paper, we present a proof-of-concept study of the enhancement of photocatalytic activity via a combined strategy of fabricating a visible-light responsive ternary heterostructure and improving overall photostability by incorporating magnetic zinc oxide/graphene/iron oxide (ZGF). A solvothermal approach was used to synthesize the catalyst. X-ray diffraction (XRD), scanning electron microscopic, energy dispersive X-ray, transmission electron microscopic, vibrating sample magnetometric, and ultraviolet–visible diffuse reflectance spectroscopic techniques were used to characterize the synthesized samples. The obtained optimal Zn(NO<sub>3</sub>)<sub>2</sub> concentration, temperature, and heating duration were 0.10 mol/L, 600°C, and 1 h, respectively. The XRD pattern revealed the presence of peaks corresponding to zinc oxide, graphene, and iron oxide, indicating that the ZGF catalyst was effectively synthesized. Furthermore, when the developed ZGF was used for methylene blue dye degradation, the optimum irradiation time, dye concentration, catalyst dosage, irradiation intensity, and solution pH were 90 min, 10 mg/L, 0.03 g/L, 100 W, and 8.0, respectively. Therefore, the synthesized ZGF system could be used as a catalyst to degrade dyes in wastewater samples. This hybrid nanocomposite consisting of zinc oxide, graphene, and iron oxide could also be used as an effective photocatalytic degrader for various dye pollutants.</p></div>","PeriodicalId":23628,"journal":{"name":"Water science and engineering","volume":"16 3","pages":"Pages 243-251"},"PeriodicalIF":4.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46177171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Assessment of first-order-moment-based sample reconstruction method for design flood estimation in changing environment 基于一阶矩的样本重建方法在变化环境下的设计洪水估算评估

IF 4

Water science and engineering Pub Date : 2023-09-01 DOI: 10.1016/j.wse.2023.05.001

Yi-ming Hu, Zhong-min Liang, Yi-xin Huang, Jun Wang, Bin-quan Li

{"title":"Assessment of first-order-moment-based sample reconstruction method for design flood estimation in changing environment","authors":"Yi-ming Hu, Zhong-min Liang, Yi-xin Huang, Jun Wang, Bin-quan Li","doi":"10.1016/j.wse.2023.05.001","DOIUrl":"10.1016/j.wse.2023.05.001","url":null,"abstract":"<div><p>Estimating the design flood under nonstationary conditions is challenging. In this study, a sample reconstruction approach was developed to transform a nonstationary series into a stationary one in a future time window (FTW). In this approach, the first-order moment (<em>E</em><sub>FTW</sub>) of an extreme flood series in the FTW was used, and two possible methods of estimating <em>E</em><sub>FTW</sub> values in terms of point values and confidence intervals were developed. Three schemes were proposed to analyze the uncertainty of design flood estimation in terms of sample representativeness, uncertainty from <em>E</em><sub>FTW</sub> estimation, and both factors, respectively. To investigate the performance of the sample reconstruction approach, synthesis experiments were designed based on the annual peak series of the Little Sugar Creek in the United States. The results showed that the sample reconstruction approach performed well when the high-order moment of the series did not change significantly in the specified FTW. Otherwise, its performance deteriorated. In addition, the uncertainty of design flood estimation caused by sample representativeness was greater than that caused by <em>E</em><sub>FTW</sub> estimation.</p></div>","PeriodicalId":23628,"journal":{"name":"Water science and engineering","volume":"16 3","pages":"Pages 226-233"},"PeriodicalIF":4.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42488701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0