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Journal of Environmental Sciences 2024年第5期139卷 556-568页

作者： Xi Wang asif hussain Qingqing Li Mingyu Ma Juan Wu Mingqiang Deng Jie Yang Dengxin Li Department of Environmental Science and Engineering Donghua UniversityShanghai 201620China Department of Environmental Science Federal Urdu University of ArtsScience and Technology75300 KarachiPakistan Shanghai Academy of Environmental Sciences Shanghai 200233China

The coupling of washing with adsorption process can be adopted for the treatment of soils contaminated with heavy metals ***,the complex environment of soil and the competitive behavior of leaching chemicals considerably restrain adsorption capacity of adsorbent material during washing process,which demands a higher resistance of the adsorbents to *** this study,we synthesized strongly magnetic,high specific surface area(573.49 m^(2)/g)UiO66 composites(i.e.,UiO66-Fe_(3)O_(4))using hydrothermal *** UiO66-Fe_(3)O_(4) was applied as an adsorbent during the ethylene diamine tetraacetic acid(EDTA)-assisted washing process of contaminated *** incorporation of UiO66-Fe_(3)O_(4)results in rapid heavy metal removal and recovery from the soil under low concentrations of washing agent(0.001 mol/L)with reduced residual heavy metal mobility of soil after ***,UiO66-Fe_(3)O_(4)can quickly recollect by an external magnet,which offers a simple and inexpensive recovery method for heavy metals from contaminated ***,UiO66-Fe_(3)O_(4)configuration with EDTA-assisted washing process showed opportunities for heavy metals contaminated sites.

关键词： UiO66 composites Metal-EDTA complexes EDTA-assisted washing Heavy metals recovery Soil

Microbial community dynamics and flavor formation mechanisms during fermentation of fermented chilies from different regions based on macro-genome sequencing， SPME-GC-MS， electronic nose， and electronic tongue

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Food Science and Human Wellness 2024年

作者： Hui Liao Yi Luo Xiang Lian hussain asif Xinlei Huang Xiaole Xia The Key Laboratory of Industrial Biotechnology， Ministry of Education， School of Biotechnology， Jiangnan University College of Food Science and Engineering， Tianjin University of Science & Technology

Fermented chili products are popular traditional fermented foods around the world. However， differences in microbial communities in fermented chilies from different regions and how they affect the flavor compounds in chili fermentation have not been reported. In this study， the dynamics of flavor compounds and microbial communities in fermented chilies from Sichuan， Guizhou， and Hunan were systematically investigated by macro-genome sequencing， solid phase microextraction-gas chromatograph-mass spectrometry (SPME-GC-MS)， electronic nose， and electronic tongue techniques. Simultaneously， the microbial metabolic mechanisms and the relationship between flavor compounds and microbiome were unraveled through staged and simulated fermentation analysis. The results showed that 53 chemical odorants， including alcohols， esters， aldehydes， and acids， were identified as chemical markers to differentiate the regional samples. Twelve microbial species， including Staphylococcus xylosus， Unclassified staphylococcus species， Weissella confusus， Lactococcus cremoris， Lactococcus garvieae， Lactiplantibacillus sakei， Pediciococcus propionicigenes， Pediciococcus idahonensis， Pediciococcus aciditolerans， Nocardioides antri， Debaryomyces hansenii， and Colletotrichum scovillei， were identified as microbial markers to differentiate the regional samples. Correlation analysis showed that Lactobacillaceae was associated with fruity， floral， spicy， and fatty aromas. The electronic nose and tongue analysis results showed that 9 flavor and 8 taste indicators significantly differed between regional samples (P < 0.05). Additionally， flavor compounds and microbial diversity were robust under initial selection stress and showed higher diversity under metabolome-microbiome interactions. Importantly， simulated fermentation confirmed that metabolome-microbiome interactions drove the shift in microbial structure， metabolism， and flavor in regionally fermented chilies. These results provide insights into

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Novel Double-Damped Tuned AC Filters in HVDC Systems

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Computers, Materials & Continua 2023年第4期75卷 1467-1482页

作者： Rana Shaheer Mehmood asif hussain Usman Ali Muhammad Tariq Mahmood Department of Electrical Engineering University of Management and TechnologyLahore54782Pakistan Department of Electrical and Computer Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-si16419Gyeonggi-doKorea School of Computer Science and Engineering Korea University of Technology and Education1600ChungjeolnoByeogchunmyunCheonan31253Korea

This paper presents a performance analysis of novel doubledampedtuned alternating current (AC) filters in high voltage direct current(HVDC) systems. The proposed double-damped tuned AC filters offer theadvantages of improved performance of HVDC systems in terms of betterpower quality, high power factor, and lower total harmonic distortion (THD).The system under analysis consists of an 878 km long HVDC transmissionline connecting converter stations at Matiari and Lahore, two major cities inPakistan. The main focus of this research is to design a novel AC filter usingthe equivalent impedance method of two single-tuned and double-dampedtuned AC filters. Additionally, the impact of the damping resistor on the ACchannel is examined. TheTHDof theHVDCsystem with and without currentAC filters was also compared in this research and a double-damped tuned ACfilter was proposed. The results of the simulation represent that the proposeddouble-damped tuned AC filter is far smaller in size, offers better powerquality, and has a much lower THD compared to the AC filters currently inplace in the converter station. The simulation analysis was carried out utilizingpower systems computer-aided design (PSCAD) software.

关键词： Double-damped tuned AC filters harmonics high voltage DC systems long distance transmission power quality total harmonic distortion

Pretreatment of cyanided tailings by catalytic ozonation with Mn^(2+)/O^3

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Journal of Environmental Sciences 2015年第2期27卷 14-21页

作者： Yulong Li Dengxin Li Jiebing Li Jin wang asif hussain Hao Ji Yijie Zhai College of Environmental Science and Engineering State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry Donghua University

The increasing amount of cyanided tailings produced as a by-product has gained significant attention in recent years because of the rapid development of the gold industry and extensive exploitation of gold mineral resources. The effective use of these secondary resources is becoming an important and urgent problem for all environmental protection staff. Manganese-catalyzed ozonation for the pre-oxidation of cyanided tailings was studied and the effects of Mn2＋dosage, initial sulfuric acid concentration, ozone volume flow, temperature and agitation speed on pretreatment were examined. The optimum reaction conditions were observed to be： ore pulp density 2.5%, agitation speed 700 r/min,temperature 60°C, Mn2＋dosage 40 g/L, ozone volume flow 80 L/hr, initial sulfuric acid concentration 1 mol/L, and reaction time 6 hr. Under these conditions, the leaching rate of Fe and weight loss could reach 94.85% and 48.89% respectively. The leaching process of cyanided tailings by Mn2＋/O3 was analyzed, and it was found that the leaching of pyrite depends on synergetic oxidation by high-valent manganese and O3, in which the former played an important part.

关键词： Cyanided tailings Pretreatment Mn2+/O3 Catalytic ozonation

Analysis of CO_3O_4/ Mildly Oxidized Graphite Oxide(mGO)Nanocomposites of Mild Oxidation Degree for the Removal of Acid Orange 7

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Journal of Donghua University(English Edition) 2015年第2期32卷 185-191页

作者：王倩时鹏辉朱少波李洁冰 asif hussain 李登新 College of Environmental Science and Engineering Donghua University College of Environmental and Chemical Engineering Shanghai University of Electronic Power

In this study,a series of Co_3O_4/ mildly oxidized graphite oxide(mGO) nanocatalysts(Co_3O_4/ mGO-l,Co_3O_4/ mGO-2 and Co_3O_4/mGO-3) were synthesized through solvothermal method and used as a mediator for the heterogeneous peroxymonosulfate(PMS)*** performance of CO_3O_4 / mGO/PMS system was investigated using acid orange 7(AO7).Results showed that Co_3O_4/mGO-3 had the best degradation efficiency of AO7 and the removal rate was above 90%in about 6 *** phenomenon indicated the catalytic activity of Co_3O_4/mGO composites was related to the oxidation degree of graphite oxide(GO).In addition,experiments showed the content of Co_3O_4 had an effect on the catalytic *** composites were characterized with X-ray powder diffraction(XRD),FTIR,Raman,X-ray photoelectron spectroscopy(XPS) and transmission electron microscopy(TEM).According to the charactrization and synergistic catalytic mechanism,the generation of Co—OH complexes found to be the initial step to activate PMS in the heterogeneous system of Co_3O_4/mGO hybrid.

关键词： graphite photoelectron orange oxidized Orange synergistic dispersed attributed activate heterogeneous

Tofukasu-derived biochar with interconnected and hierarchical pores for high efficient removal of Cr (Ⅵ)

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Biochar 2023年第1期5卷 1189-1201页

作者： Liang Fang Wei Yang Jianhua Hou kewang Zheng asif hussain Yongcai Zhang Zhenhua Hou Xiaozhi Wang School of Environmental Science and Engineering Yangzhou UniversityYangzhou 225000People’s Republic of China Beijing System Design Institute of Electro-Mechanic Engineering Beijing 100005People’s Republic of China Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization Nanjing 210095People’s Republic of China School of Chemistry and Materials Science Hubei Engineering UniversityXiaoganPeople’s Republic of China Jiangxi Xinda Hangke New Materials Technology Co. LtdNanchang 330096People’s Republic of China

Herein,we report the synthesis of interconnected hierarchical pore biochar(HTB)via an ice-templating strategy using bio-waste(tofukasu).The abundance of N-and O-containing functional groups in tofukasu makes it easy to form hydrogen bonds with water molecules and water clusters,resulting in nano-micro structures like ice clusters and snow crystals during freezing *** importantly,tofukasu will be squeezed by micron-scale snow crystals to form coiled sheet-like structures,and its surface and interior will be affected by needle-like ice nanocrystals from several nanometers to tens of nanometers to form transverse groove needles and *** ice crystals are then removed by sublimation with tofukasu,leaving the interconnected pore structure ***,the ice template synthesis strategy endowed the interconnected hierarchical pore structure of HTB with a large specific surface area(SBET,733 m^(2)⋅g^(−1))and hierarchical porosity(30.30%for mesopores/total pore volume ratio),which is significantly higher than the normal dry treated tofukasu biochar(TB),which had a SBET of 436 m^(2)⋅g^(−1) and contained 1.53%*** addition,the sheet-like structure with interconnected pores of HTB favors high exposure of active sites(N-and O-containing functional groups),and a fast electron transport *** a result,HTB had an excellent adsorption capacity of 159.65 mg⋅g^(−1),which is 4.7 times that of typical block biochar of TB(33.89 mg⋅g^(−1))according to Langmuir *** characterization,FTIR and XPS analysis showed that the mechanism of Cr(Ⅵ)removal by HTB included electrostatic attraction,pore filling,reduction and surface complexation.

关键词： Chromium adsorption Tofukasu Ice template Biochar Hierarchical pore structure Mesopores

Self-developed Pneumatic Spraying Scrubber for Recovering NO_x from Metallurgical Exhaust

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Journal of Donghua University(English Edition) 2019年第6期36卷 521-526页

作者： SUN Hongrui DUAN Guangjie asif hussain XUE Fei WANG Jun LI Dengxin SONG Pengcheng College of Environmental Science and Engineering Donghua UniversityShanghai 201620China Shanghai Society for Environmental Science Shanghai 200001China

NOx is generally composed of NO,NO2,N2O,N2O4,and N2O5,which may form photochemical smoke and may lead to acid rain,greenhouse effect and destruction of the ozone layer in the *** this paper,a new pneumatic spraying scrubber was developed for recovering NOx from metallurgical *** this device,NOx was converted into nitric acid,which was then recycled in the oxidization *** with conventional pneumatic spraying scrubbers,the self-developed pneumatic spraying scrubber had significant advantages,such as the simple structure without liquid circulation pump,easy operation,energy conservation,and the high recovery *** influences of various parameters,such as the spray tube height,the spray nozzle diameter,the concentration and temperature of the absorbent,and the operating pressure,on the recovery of NOx were also *** best NOx removal efficiency was 76.08%.When the spray tube height was 0.74 m,the nozzle diameter was 0.5 mm,the absorbent content was 5%at 30℃,and the operating pressure was 0.15-0.17 *** invented pneumatic spraying scrubber successfully solves the problems of high-concentration NOx absorption and regeneration of nitric *** addition,the device can also absorb other harmful gases and provide a possible new treatment process for air pollution control.

关键词： absorption NO x pneumatic spray scrubber flue gases equipment

Experimental and numerical study of buoyancy driven flow within a bottom heated vertical concentric cylindrical enclosure

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Natural Science 2013年第7期5卷 771-782页

作者： asif hussain Malik Shahab Khushnood Ajmal Shah Department of Mechanical Engineering Pakistan Institute of Engineering and Applied Sciences Islamabad Pakistan Department of Mechanical Engineering University of Engineering and Technology Taxila Pakistan

The study of buoyancy driven flow within bottom-heated vertical concentric cylindrical enclosure was important with respect to the processes in chemical and nuclear industries. In this research paper, experimental and numerical study of the axial temperature gradient and the heat transfer mechanism within the enclosure were performed. The numerical simulations were validated by comparing the numerical results with experimentally measured axial temperature. The numerical results of the streamlines within the enclosure depicted the real picture of the buoyancy effects. Eighteen different experiments were performed by using inner cylinder of different materials and outer cylinder of different diameters within the bottom disc temperature range of 353 - 433 K. The CFD simulations were performed to study the buoyancy effects within the enclosure. At the bottom disc with temperature up to 393 K, the streamlines within the inner cylinder were almost the same for both con- figurations being independent of outer cylinder diameter, while at 433 K streamlines within the inner cylinders varied. With larger diameter outer cylinder configuration, the buoyancy effects in the outer annulus were stronger as compared to smaller one.

关键词： Experimental Numerical Study Buoyancy Driven Flow Cylindrical Enclosure Materials Temperature

石墨烯氢氧化钴复合催化剂的一步合成及其对酸性橙的催化降解(英文)

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物理化学学报 2014年第9期30卷 1720-1726页

作者：李洁冰伊玉时鹏辉王倩李登新 asif hussain 杨明东华大学环境科学与工程学院国家环境保护纺织工业污染防治工程技术中心上海201620 上海电力学院环境与化学工程学院上海200090 东华大学分析测试中心上海201620

用一步合成自组装法制备出了氢氧化钴与还原氧化石墨烯(Co(OH)2/rGO)的复合催化剂,并将其用于水中染料的催化降解实验.通过X射线衍射(XRD),激光拉曼(Raman)光谱,透射电镜(TEM),X射线能量色散谱(EDS)以及X射线光电子能谱(XPS)等一系列分... 详细信息

用一步合成自组装法制备出了氢氧化钴与还原氧化石墨烯(Co(OH)2/rGO)的复合催化剂,并将其用于水中染料的催化降解实验.通过X射线衍射(XRD),激光拉曼(Raman)光谱,透射电镜(TEM),X射线能量色散谱(EDS)以及X射线光电子能谱(XPS)等一系列分析手段对催化剂的结构形貌进行了详细的表征,表征结果证实氢氧化钴很好地附着在还原石墨烯的表面.最后初步考察了催化剂催化单过硫酸钾(PMS)降解酸性橙(AO7)的性能.结果表明,催化剂显示出了高效的催化性能,酸性橙的色度可在12 min内完全去除,总有机碳(TOC)实验也表明染料降解的同时也可获得较高的矿化度.循环稳定性实验表明在进行到第三次实验时,催化剂仍能保持高的催化活性,将酸性橙在16 min内降解完毕.

关键词：高级氧化单过硫酸氢钾氢氧化钴石墨烯酸性橙

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载钴催化剂的制备及对染料降解

环境工程学报 2015年第9期9卷 4309-4313页

作者：李洁冰李玉龙 asif hussain 王瑾李登新东华大学环境科学与工程学院国家环境保护纺织污染防治工程技术中心上海201620

以氧化石墨和六水合硝酸钴为前驱体用水热法制备出了不同的催化剂。通过透射电镜、红外光谱、热重以及X射线衍射等测试方法对制得的催化剂进行了表征与分析,并通过对酸性橙Ⅱ的催化降解实验确定催化剂的催化性能。通过实验发现,催化剂... 详细信息

以氧化石墨和六水合硝酸钴为前驱体用水热法制备出了不同的催化剂。通过透射电镜、红外光谱、热重以及X射线衍射等测试方法对制得的催化剂进行了表征与分析,并通过对酸性橙Ⅱ的催化降解实验确定催化剂的催化性能。通过实验发现,催化剂制备条件为:六水合硝酸钴与氧化石墨质量比为1∶1,肼的质量为氧化石墨的7/10,加热时间为4 h时,降解染料所用的时间最短。在此条件下制出的催化剂可催化单过硫酸氢钾在10 min内将染料色度基本去除。

关键词：酸性橙Ⅱ 石墨烯降解速率单过硫酸氢钾