检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Cao, Xiaochang Song, Rujie Zhang, Liwei Cheng, Fang Wang, Zhi School of Environmental and Municipal Engineering Tianjin Chengjian University Tianjin300384 China Tianjin Key Laboratory of Aquatic Science and Technology Tianjin Chengjian University Tianjin300384 China Chemical Engineering Research Center School of Chemical Engineering and Technology Tianjin University Tianjin300350 China Chemical Engineering Research Center School of Engineering and Technology Tianjin University Yaguan Road 135# Jinnan District Tianjin300350 China

Membrane separation technology has broad application prospects in O2/N2 separation, and improving the permselectivity of membranes remains a key problem to be solved. O2 and N2 have different magnetic properties and can be separated by magnetism. In addition, coupling magnetic separation with the use of a molecular sieve, which supported by metal-organic frameworks (MOFs), could further improve the separation performance. In this work, the magnetic core-shell MOF (Fe3O4@ZIF-8) was prepared as filler, and the impacts of the Fe3O4@ZIF-8 morphology, loading, channel magnetic properties and ordered arrangement on membrane O2/N2 selectivity were evaluated. To establish a magnetic sieving O2 permeation channel, the preparation process was carried out under the action of a magnetic field so that the fillers in the membrane were arranged orderly. Due to the synergistic impact of the structurally ordered MOF channel and the magnetism, the gas transport performance of the resulting magnetic mixed matrix membranes (MMMs) was substantially improved. Therefore, the O2 permeability and O2/N2 selectivity of 15wt%Fe3O4@ZIF-8-8/Pebax MMMs reached 194 Barrer and 11.97, respectively. This study not only presents a novel approach for creating high-performance O2/N2 membranes but also plays a leading role in the development of magnetism-controlled multiscale (magnetic core-shell and filler ordered) membrane structural engineering. © 2024, The Authors. All rights reserved.

关键词： Organometallics

来源：评论

学校读者我要写书评

暂无评论

Biochar Induced Low Body Phase g-C3N4 with High Crystallinity in Situ Grown NiSe2 Nanoparticles for Hybrid Supercapacitor

SSRN

引用

SSRN 2024年

作者： Xu, Yang Zheng, Leizhi Liu, Chengbao Chen, Feng Qian, Junchao Qiu, Yongbin Meng, Xianrong Chen, Zhigang Jiangsu Key Laboratory for Environment Functional Materials Suzhou University of Science and Technology Suzhou215009 China School of Materials Science and Engineering Suzhou University of Science and Technology Suzhou215009 China Jiangsu Collaborative Innovation Center of Technology and Material for Water Treatment Suzhou University of Science and Technology Suzhou215009 China Jiangsu Province Ceramics Research Institute Co. Ltd. Yixing214221 China Suzhou Institute of Environmental Science Suzhou215007 China

Nickel selenide, as hybrid supercapacitor electrode material, has excellent electrochemical performance. However, it also faces challenges, such as slow charge transfer speed, easy agglomeration, and volume expansion. Here, we prepared a high crystalline graphitic carbon nitride (CCN)/biochar (C)/nickel selenide (NiSe2) ternary composite material as the positive electrode to solve the problems mentioned above. After introduction of C, the few layers and low body phase of CN can be obtained by utilizing its self-assembly and micro-reaction space characteristics. Furthermore, CN with many defects and low crystallinity degree can be improved by introducing molten salt system, so as to obtain CCN. The strong interconnections between the π-conjugated layer of CCN and the biochar promote electron and ion transport efficiency, which can increase the charge transfer speed, decrease accumulation agglomeration and poor stability of NiSe2. In addition, the lone pair electrons of nitrogen atoms in CCN enhance electrode wettability and enrich charge transport channel, resulting in an excellent electrochemical performance of the composite. The results show that the specific capacitance of CCN/C-NiSe2-90 nanocomposite electrode is 1309.75 F g-1 (1 A g-1), which is significantly higher than that of NiSe2 (965.75 F g-1) and CCN/C (74 F g-1) in the three-electrode system. The CCN/C-NiSe2-90//AC presents a maximum energy density of 28.66 Wh kg-1 at 849.88W kg-1 and a maximum power density of 17,000 W kg-1 at 12.75 Wh kg-1. The 80% capacitance retaining of its initial performance after 5000 cycles (5 A g-1) demonstrates remarkable cycle stability of the *** results indicate that CCN/C-NiSe2-90, as a high-performance battery-type electrode material, has considerable potential for the future usage in hybrid supercapacitors. © 2024, The Authors. All rights reserved.

关键词： Self assembly

来源：评论

学校读者我要写书评

暂无评论

Synergistic Role of Lactic Acid in Short-Chain Fatty Acids and Hydrogen Production During Anaerobic Fermentation of Food Waste: Positive Effects, Reaction Mechanism, and Implications for Green Economy

SSRN

引用

SSRN 2024年

作者： Wang, Xudong Ming, Xujia Han, Xiao Liu, Yao Chen, Mengyu Zhang, Ting Li, Xianguo Zhang, Dahai Zhang, Lei Ergas, Sarina J. Vinardell, Sergi Wang, Xiaoming Anupoju, Gangagni Rao Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and Technology Dalian University of Technology Linggong Road 2 Dalian116024 China Department of Civil and Environmental Engineering University of South Florida 4202 E Fowler Ave ENG 030 TampaFL33620 United States Department of Chemical Engineering and Analytical Chemistry University of Barcelona Barcelona08028 Spain Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment Under Ministry of Education Chongqing University Chongqing400044 China Tarnaka Hyderabad500007 India Ocean University of China China

The addition of LA to the fermentation process significantly increased hydrogen production. Particularly, the experimental group containing 3 g/L of LA exhibited the highest cumulative hydrogen yield of 57.02 ± 2.10 mL/(g VSS), representing a 487.84% increase compared with the control group. Moreover, 15 g/L of LA completely inhibited hydrogen production. Additionally, high concentrations of LA inhibited the dissolution and hydrolysis processes of macromolecular organic matter. Furthermore, LA promoted the conversion of organic matter to long-chain acids, particularly n-butyric acid. Enzyme analysis revealed increased butyryl-CoA dehydrogenase activity in the LA-containing food waste reactor. Furthermore, microbial community analysis indicated that LA altered the structure of the bacterial community, leading to a significant decrease in its diversity and uniformity. Additionally, LA promoted the growth of chain-elongating bacteria, particularly butyric acid producers. These findings indicate the significance of inhibiting the methanogenic pathway for hydrogen and acid production from acidified food waste. © 2024, The Authors. All rights reserved.

关键词： Lactic acid

来源：评论

学校读者我要写书评

暂无评论

Is Monochloramine a Better Alternative Pre-Oxidant for Enhancing Algal Removal by Conventional Drinking Water Treatment Process?

SSRN

引用

SSRN 2023年

作者： Liu, Han Lv, Huanyu Xu, Hangzhou Rao, Dandan Zhang, Jian Sun, Bo Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science & Engineering Shandong University Shandong Qingdao266237 China Department of Chemical and Environmental Engineering University of California Riverside A235 Bourns Hall 3401 Watkins Drive RiversideCA92521 United States College of Safety and Environmental Engineering Shandong University of Science and Technology Shandong Qingdao266590 China

Algal blooms worldwide pose many challenges to drinking water production and pre-oxidation with NaClO, KMnO4 or ozone is commonly used to enhance algal removal by the conventional drinking water treatment process. However, these currently employed oxidation processes often result in significant algal cell lysis or impede the operation of the subsequent units. Higher algal removal with pre-chlorination process in real water compared to that in synthetic water was accidentally observed. The preliminary results indicated ammonium in real water altered the chlorine species to NH2Cl which was responsible for the improved treatment efficiency, which resulted in this study. 1.5~3.0 mg/L of NH2Cl with oxidation time of 3~7 h significantly enhanced algal removal by coagulation. Selective oxidation of surface-adsorbed organic matters (S-AOM) by NH2Cl and peeling them off from the algal surface increased the zeta potential from −20.2 mV to −3.8 mV while promisingly maintaining cell integrity is the primary mechanism of enhancing algal removal by coagulation. The peeled S-AOM kept a large molecular weight and acted as polymer aids. In addition, most of the added coagulant (Al3+) was utilized to reduce the repulsive electrostatic forces between the algal cells rather than complexed by S-AOM and other dissolved organic matter. Compared to NaClO and KMnO4, NH2Cl showed the best performance in improving algal removal, avoiding cell lysis and decreasing DBPs formation potential. In major Chinese cities, water purification plants commonly rely on suburban lakes or reservoirs as water sources, necessitating the transportation of raw water over long distances, which often takes several hours. Given these inherent challenges, the implementation of monochloramine pre-oxidation as a preferred treatment process for algal water, simultaneously mitigating pipeline corrosion, emerges as a viable and advantageous approach. © 2023, The Authors. All rights reserved.

关键词： Chlorine compounds

来源：评论

学校读者我要写书评

暂无评论

Optimizing Nitrogen Removal in Wastewater Treatment Plants Using Biological Aerated Filters

SSRN

引用

SSRN 2024年

作者： Li, Juan Niu, Ziru Li, Lei Zhou, Shuting Shaanxi Provincial Land Engineering Construction Group Key Laboratory of Degraded and Unused Land Consolidation Engineering Ministry of Natural Resources China Health Wine Co. LTD. Tanchang Street Renhuai City China Shaanxi Engineering Research Center of Land Consolidation Shaanxi Provincial Land Consolidation Engineering Technology Research Center China School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou215009 China

Reducing total nitrogen (TN) presents a significant challenge for numerous wastewater treatment facilities. In order to address this issue, the current study employed a biological aerated filter for the treatment of wastewater containing low nitrogen concentrations. Both lab-scale and pilot-scale biofilters were constructed to investigate the denitrification performance and maximum denitrification load. The findings indicated that the anaerobic denitrification process of established biofilm adhered to pseudo-first-order kinetics. The results of batch testing and continuous-flow experiments confirmed that the minimum hydraulic retention time (HRT) required for mature biofilm was determined to be 0.5 hours. The optimal operating parameters were found to be as follows: influent NO3-N concentration of 25 mg/L, HRT of 0.5 hours, resulting in effluent TN levels below 1 mg/L. Under these conditions, the denitrifying load for the lab-scale I-BAF system was calculated to be 1.26 kg (TN)/(m3·d). Furthermore, it was observed that the maximum denitrifying load could reach 2.2 kg (TN)/(m3·d) when the influent NO3-N concentration was increased to 50 mg/L while maintaining an HRT of 0.5 hours. For the mature biofilter, the appropriate hydraulic retention time (HRT) ranged from 2 hours to 0.5 hours. Microbial diversity analysis revealed that the genus Enterobacter was dominant in all denitrification systems, followed by Comamonas and Rhodococcus. The operational parameters described in the paper could be recommended for a full-scale wastewater treatment facility. © 2024, The Authors. All rights reserved.

关键词： Denitrification

来源：评论

学校读者我要写书评

暂无评论

A Novel Pseudo-Label Generation Method for Semi-Superivised SAR Target Recognition Based on Deep Learning

A Novel Pseudo-Label Generation Method for Semi-Superivised ...

引用

IEEE International Conference on Image Processing

作者： Xinzheng Zhang Yuqing Luo Liping Hu School of Microelectronics and Communication Engineering Chongqing University Chongqing China Chongqing Key Laboratory of Space Information Network and Intelligent Information Fusion Chongqing China Science and Technology on Electromagnetic Scattering Laboratory Beijing Institute of Environmental Features Beijing China

Automatic target recognition (ATR) is a significant application scenario for Synthetic aperture radar (SAR) image interpretation. Deep-learning based SAR ATR approaches relies on large amounts of labeled data. However, labeled SAR images are scarce and expensive. In this paper, a novel semi-supervised learning (SSL) framework is proposed for SAR ATR, which effectively alleviates the need of labeled samples. This method develops an epoch- and uncertainty-aware pseudo-label selection (EUAPS) mechanism, which takes advantage of the underutilized consistency between training epochs, and introduces the uncertainty estimates. EUAPS can select pseudo-labels with high-confidence, allowing the network to perform well even when labels are extremely scarce. Extensive experimental results illustrate that the EUAPS achieves 97.82% accuracy when 10 labeled samples per class and 87.86% when only 5 labels per class respectively, outperforming the state-of-the-art SSL methods and demonstrating the superiority.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Construction of Superhydrophilic/Superhydrophobic Composite Photocatalysts for Efficient Gas-Liquid-Solid Three-Phase Photocatalytic Degradation of Methyl Mercaptan

SSRN

引用

SSRN 2024年

作者： Yang, Zichang Xu, Yuyao He, Li Lu, Xingkai Yao, Xiaolong Li, Changming Gao, Hainan Yao, Zhiliang Wu, Chao School of Light Industry Science and Engineering Beijing Technology and Business University Beijing100048 China State Environmental Protection Key Laboratory of Food Chain Pollution Control Beijing Technology and Business University Beijing100048 China UKCRIC Advanced Infrastructure Materials Laboratory Department of Civil and Environmental Engineering Imperial College London South Kensington LondonSW7 2AZ United Kingdom School of Ecology and Environment

Photocatalytic oxidation technology holds considerable promise for effectively removing volatile organic compounds. However, conventional gas-solid photocatalytic technology faces significant limitations, including a low mineralization rate and incomplete degradation, leading to the accumulation of undesirable intermediate products. This study introduces an innovative gas-liquid-solid photocatalytic oxidation system that utilizes a superhydrophilic/superhydrophobic photocatalyst for the efficient removal of methyl mercaptan. By synthesizing superhydrophobic Cu-doped UiO-66 and combining with TiO2, the resulting OCUN/T photocatalysts was thoroughly chatacterized and tested under various conditions. The dynamic system consistently maintains a high removal rate (exceeding 99%) at flow rate of 50 ml/min and a substantial mineralization rate of methyl mercaptan over 10 hours operation. The removal efficiency of methyl mercaptan shows remarkable improvement under sunlight intensities exceeding 35×1000 lm. Furthermore, a detailed mechanism for its degradation through the gas-liquid-solid photocatalytic oxidation system is proposed, highlighting a novel and cost-effective approach for the VOCs removal. © 2024, The Authors. All rights reserved.

关键词： Titanium dioxide

来源：评论

学校读者我要写书评

暂无评论

Acute Toxicity and Genotoxicity Evaluation of Irradiated Ophiopogonis Radix at 25 Kgy with Electron Beam

SSRN

引用

SSRN 2022年

作者： Jiang, Fayang Chen, Chunyan Tian, Junrong Li, Han Li, Jinrong Wu, Tao Zhao, Yixuan Wang, Dan Long, Xiaoyan School of Life Science and Engineering Southwest University of Science and Technology Mianyang621010 China Defense Key Laboratory of the Nuclear Waste and Environmental Security Mianyang621010 China

As concerned about the potential risks of irradiated Ophiopogonis Radix (IOR) at a high radiation level (25 kGy) by high-energy electron beam irradiation, this study evaluated oral acute toxicity and genotoxicity of IOR. Moisture, total ash, water-soluble extracts, and ruscogenin content in IOR meet the requirement of Ophiopogonis Radix described in the Chinese Pharmacopoeia. When the mice received by oral 21.5 g/kg BW administration of IOR in the acute toxicity test, neither mortality nor any other abnormal general clinical signs were found within 14 days, except that 10% of mice suffered from diarrhea on day 1, which disappeared and returned to normal on day 4. The acute toxicity test indicated the LD 50 of IOR was higher than 21.5 g/kg BW. Ames test showed no dose-dependent increase in TA97a, TA98, TA100, TA102, and TA1535 strains with or without rat liver microsomal enzyme mixture (S9) metabolic activation, at a quantity range of 50-5000 μg IOR. Mouse micronucleus test of bone marrow cells demonstrated no signiﬁcant increase in the frequencies of micronucleated polychromatic erythrocytes (MN PCEs) among each IOR dose. Mouse sperm abnormality test showed that there was no evidence of the potential to induce sperm malformation with oral administration at doses of 2.5, 5.0, and 10.0 g/kg BW. Overall, the acute toxicity or genotoxicity of IOR were not observed, indicating that IOR at 25 kGy with a high-energy electron beam is toxicologically safe. © 2022, The Authors. All rights reserved.

关键词： Electron beams

来源：评论

学校读者我要写书评

暂无评论

Optimization of Operating Parameters of Short-Cut Nitrification and Denitrification Process of Coal Pyrolysis Wastewater

SSRN

引用

SSRN 2023年

作者： Huang, Weiliang Wan, Ning Shi, Jingxin Yujie, Tang Liu, Jingchun Hao, Hu Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China School of Applied Meteorology Nanjing University of Information Science & Technology Nanjing210044 China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin150090 China Harbin Institute of Technology China

Phenolic compounds and nitrogen in coal pyrolysis wastewater has become a limiting factor for industrial development, creating conflicts with the principles of sustainability and environmental protection. While denitrification technologies for municipal wastewater have been well-established, research on short-cut denitrification for coal pyrolysis wastewater remains relatively limited. By controlling operational parameters, the study aimed to investigate the effects of different pH levels, Dissolved Oxygen (DO), and external carbon sources on short-cut denitrification for coal pyrolysis wastewater. Under conditions of adequate alkalinity, changes in pH had no significant impact on Nitrogen Accumulation Ratio (NAR) and Total Nitrogen (TN) removal ratios. When DO concentrations were controlled within the range of 2.0 to 4.0 mg/L for 5 days, NAR gradually decreased, indicating that operating the reactor at lower DO concentrations was more conducive to maintaining higher NAR levels. When the COD ratio of methanol to crude phenol was 1:1 and 1:3, the denitrification ratios were 5.13 mg NO2--N/ (g vss∙h) and 3.94 mg NO2--N/ (g vss∙h), respectively. When only crude phenol was used as an external carbon source with a C/N ratio of approximately 4, TN removal efficiency reached 90.32%. However, the denitrification ratio decreased to 1.66 mg NO2--N/ (g vss∙h). The Gas Chromatography Mass Spectrometry (GC-MS) analysis results indicated that phenol was the primary electron donor in the denitrification process of the system. © 2023, The Authors. All rights reserved.

关键词： Phenols

来源：评论

学校读者我要写书评

暂无评论

Catalytic Activation of Persulfate by Mechanically-Treated Natural Pyrite: Revisit on the Dominant Role of Sulfur Vacancies and Size Effect

SSRN

引用

SSRN 2022年

作者： Sun, Yan Zhou, Tao Xiang, Wei Wu, Xiaohui School of Environmental Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Water and Wastewater Treatment HUST MOHURD Wuhan430074 China

Mechanical treatment has been widely used to modify the surface properties of nature pyrite minerals and improve their catalytic performances;however, the mechanistic relationship still keeps unclear. In this study, we have systematically investigated the effect of milling speed treatment on the surface characteristics of commercial natural pyrite and evaluated the activation ability of persulfate (PDS) for the degradation of sulfamethoxazole (SMX). The results demonstrated that increase in the milling speed of 200-600 rpm could dramatically enhance the degradation and mineralization of SMX, while lower speed (≤ 200 rpm) exhibited marginal effect. The high milling speeds could reduce the content of sulfate and S(-II) in the pyrite and lead to the occurrence of sulfur vacancies (SVs) for promotional activation of PDS. Nevertheless, the SVs content was not in accordance with increased speed and size effect would mainly contribute to the efficient degradation of SMX. The milling pyrite/PDS system could efficiently treat a molasses-processed wastewater with COD removal of 770 mg/L, suggesting slow-release function of pretreated pyrite and it broaden application potential. In addition, based on the novel conclusion of the mechanism, this study provided a green, efficient and economical pyrite mechanical activation method and its application. © 2022, The Authors. All rights reserved.

关键词： Pyrites

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：