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Degradation of iopamidol in the permanganate/sulfite process:Evolution of iodine species and effect on the subsequent formation of disinfection by-products

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Journal of Environmental Sciences 2024年第1期135卷 345-352页

作者： Yimin Lin Hongyu Dong Yating Zhu gongming zhou Junlian Qiao Xiaohong Guan State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Department of Environmental Science School of Ecological and Environmental SciencesEast China Normal UniversityShanghai 200241China

Permanganate/sulfite(Mn(VII)/S(IV))process is a promising pre-oxidation technology for sequestering the emerging organic contaminants in drinking water treatment plant.Iopamidol(IPM),a representative of iodinated X-ray contrast media,has been widely detected in water sources and has the risk of forming iodinated disinfection byproducts(I-DBPs)in water treatment system.In this study,we investigated the evolution of iodine species during the IPM degradation by the Mn(VII)/S(IV)process and its effect on the subsequent formation of I-DBPs during chlorination at pH 7.0 and 8.0.IPM could be effectively degraded in the Mn(VII)/S(IV)process at environmentally relevant pH(pH 7.0 and 8.0).The results of quenching and competitive oxidation kinetic experiments revealed that SO^(·-)_(4)was the major reactive oxidizing species contributing to the degradation of IPM whereas the contributions of HO·and reactive manganese species were negligible in the Mn(VII)/S(IV)process.I–and IO–3were generated while no HOI was detected during the degradation of IPM in the Mn(VII)/S(IV)process.The effects of IPM oxidation by Mn(VII)/S(IV)on the subsequent formation of chlorinated disinfection by-products(Cl-DBPs)during chlorination were related to the category of Cl-DBPs.The pre-oxidation of IPM by Mn(VII)/S(IV)resulted in the generation of I-DBPs during the disinfection process although no I-DBPs were detected if no pre-oxidation was applied.The finding of this study suggested that attention should be paid to the toxicity of DBPs when water containing iodinated organic contaminants is treated by Mn(VII)/S(IV)process or other pre-oxidation technologies.

关键词： Permanganate/sulfite Iopamidol Sulfate radical Iodinated disinfection byproducts Pre-oxidation

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Numerical Analysis of Heat Transfer Characteristics to Supercritical CO_(2) in a Vertical Mini-Channel:Transition and Pseudo-Boiling

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Journal of Thermal Science 2024年第1期33卷 101-113页

作者： YUAN Baoqiang WANG Wei XIN gongming DU Wenjing School of Energy and Power Engineering Shandong UniversityJi'nan 250061China

Large eddy simulations have been conducted to study upward transitional flows and heat transfer characteristics of supercritical CO_(2) in a vertical mini-channel.The numerical simulation was carried out on a modified buoyantPimpleFOAM solver in OpenFOAM 7,and was verified using experiment data.Numerical results indicate that increasing the Grashof numbers can reduce the flow stability and make the flow transition earlier.There are four stages of heat transfer in the transition process,i.e.,weakened,improved,recovered and normal heat transfer.These heat transfer phenomena in the transition process were explained from three perspectives:thermal boundary layer theory,turbulent transport and pseudo-boiling theory.Heat transfer enhancement during transition is related to the transport of supercritical molecular clusters,and these molecular clusters are regarded as pseudo-bubbles in pseudo-boiling theory.The flow pattern of the pseudo-phases in the dia-Widom process contains single-phase flow,steady pseudo-film flow,unsteady pseudo-film flow,partial pseudo-bubbles flow and flocculent pseudo-film flow.Pseudo-bubbles have similar behaviors to subcritical bubbles,i.e.,break-up,deformation,condensation and coalescence.Relevant researches in this work are favorable for understanding the heat transfer mechanism of supercritical fluids during flow transition.

关键词： supercritical heat transfer large eddy simulation transition pseudo-boiling

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Constructing high coordination number of Ir-O-Ru bonds in IrRuO_(x)nanomeshes for highly stable acidic oxygen evolution reaction

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Nano Research 2024年第6期17卷 5073-5079页

作者： Ge Yu Ruilong Li Yida Zhang Xingen Lin gongming Wang Xun Hong Center of Advanced Nanocatalysis(CAN) Department of Applied ChemistryUniversity of Science and Technology of ChinaHefei 230026China National Synchrotron Radiation Laboratory(NSRL) University of Science and Technology of ChinaHefei 230029China

IrRu bimetallic oxides are recognized as the promising acidic oxygen evolution reaction(OER)catalysts,but breaking the trade-off between their activity and stability is an unresolved question.Meanwhile,addressing the issues of mass transport obstruction of IrRu bimetallic oxides under high current remains a challenge for the development of proton exchange membrane water electrolysis(PEM-WE).Herein,we prepared an IrRuO_(x)nanomeshes(IrRuO_(x)NMs)with high coordination number(CN)of Ir-O-Ru bonds in a mixed molten salt with high solubility of the Ir/Ru precursor.X-ray absorption spectroscopy analysis revealed that the IrRuO_(x)NMs possess high coordination number of Ir-O-Ru bonds(CNIr-O-Ru=5.6)with a distance of 3.18Å.Moreover,the nanomesh structures of IrRuO_(x)NMs provided hierarchical channels to accelerate the transport of oxygen and water,thus further improving the electrochemical activity.Consequently,the IrRuO_(x)NMs as OER catalysts can simultaneously achieve high activity and stability with low overpotential of 196 mV to reach 10 mA·cm^(−2)and slightly increase by 70 mV over 650 h test.Differential electrochemical mass spectrometry tests suggest that the preferred OER mechanism for IrRuO_(x)NMs is the adsorbent evolution mechanism,which is beneficial for the robust structural stability.

关键词： oxygen evolution reaction IrRuO_(x) Ir-O-Ru bonds two-dimensional(2D)nanomesh proton exchange membrane device mass transport

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Predicting heavy metals' adsorption edges and adsorption isotherms on MnO_2 with the parameters determined from Langmuir kinetics

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Journal of Environmental Sciences 2015年第1期27卷 207-216页

作者： Qinghai Hu Zhongjin Xiao Xinmei Xiong gongming zhou Xiaohong Guan State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University

Although surface complexation models have been widely used to describe the adsorption of heavy metals, few studies have verified the feasibility of modeling the adsorption kinetics,edge, and isotherm data with one p H-independent parameter. A close inspection of the derivation process of Langmuir isotherm revealed that the equilibrium constant derived from the Langmuir kinetic model, KS-kinetic, is theoretically equivalent to the adsorption constant in Langmuir isotherm, KS-Langmuir. The modified Langmuir kinetic model（MLK model） and modified Langmuir isotherm model（MLI model） incorporating p H factor were developed. The MLK model was employed to simulate the adsorption kinetics of Cu（II）, Co（II）, Cd（II）, Zn（II） and Ni（II） on MnO2 at pH 3.2 or 3.3 to get the values of KS-kinetic. The adsorption edges of heavy metals could be modeled with the modified metal partitioning model（MMP model）, and the values of KS-Langmuir were obtained. The values of KS-kinetic and KS-Langmuir are very close to each other, validating that the constants obtained by these two methods are basically the same. The MMP model with KS-kinetic constants could predict the adsorption edges of heavy metals on MnO2 very well at different adsorbent/adsorbate concentrations. Moreover, the adsorption isotherms of heavy metals on MnO2 at various pH levels could be predicted reasonably well by the MLI model with the KS-kinetic constants.

关键词： Heavy metals Adsorption edge Adsorption isotherm Adsorption constants

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Towards Reliable Configuration Management in Clouds: A Lightweight Consistency Validation Mechanism for Virtual Private Clouds

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Chinese Journal of Electronics 2024年

作者： Yuhang QIU gongming ZHAO Hongli XU Long LI He HUANG Liusheng HUANG School of Computer Science and Technology University of Science and Technology of China Suzhou Institute for Advanced Research University of Science and Technology of China School of Computer Science and Technology Soochow University

The virtual private cloud service currently lacks a real-time end-to-end consistency validation mechanism, which prevents tenants from receiving immediate feedback on their requests. Existing solutions consume excessive communication and computational resources in such large-scale cloud environments, and suffer from poor timeliness. To address these issues, we propose a lightweight consistency validation mechanism that includes real-time incremental validation and periodic full-scale validation. The former leverages message layer aggregation to enable tenants to swiftly determine the success of their requests on hosts with minimal communication overhead. The latter utilizes lightweight validation checksums to compare the expected and actual states of hosts locally, while efficiently managing the checksums of various host entries using inverted indexing. This approach enables us to efficiently validate the complete local configurations within the limited memory of hosts. In summary, our proposed mechanism achieves closed-loop implementation for new requests and ensures their long-term effectiveness.

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“历史学”还是“图像学”?——历史图像学的相关概念与跨学科研究方法论(上)

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文艺理论与批评 2024年第1期 175-192页

作者：李公明广州美术学院美术史系

艺术史学界的“图史转向”趋势以及历史学界对于图像研究在整体上还缺乏应有重视,这使“历史学还是图像学”成为一个值得深入讨论的前沿议题。通过梳理、辨析“历史”与“图像”等基本概念系谱,“历史图像学”作为复合型学科概念在推进... 详细信息

艺术史学界的“图史转向”趋势以及历史学界对于图像研究在整体上还缺乏应有重视,这使“历史学还是图像学”成为一个值得深入讨论的前沿议题。通过梳理、辨析“历史”与“图像”等基本概念系谱,“历史图像学”作为复合型学科概念在推进前沿学科建构中的重要作用及意义得以呈现。建构中的历史图像学的主干应该建立在以历史学与图像学为主的跨学科基础之上,同时广泛吸纳艺术史、文化史、跨文化研究、钱币学、古物学、思想史等学科领域的方法论及研究成果。“历史图像学”以历史上的图像史料为基本的研究对象,坚持在历史语境中解读图像,同时充分运用图像学的研究方法解读历史图像,目标是建立带有图像学研究方法的历史研究范式和叙事模式,使之成为历史学研究中的一个重要组成部分。

关键词：历史学图像学艺术史跨学科方法论

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“历史学”还是“图像学”?——历史图像学的相关概念与跨学科研究方法论(下)

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文艺理论与批评 2024年第2期 167-184页

作者：李公明广州美术学院美术史系

五、图像史料与文化史研究的连接与跨越,图像史料的微观研究与历史叙事的有效性固然有紧密联系,其在宏观视野上的作用与意义也是历史图像学和文化史研究的连接处,最后成为回应“历史学还是图像学”的一个重要节点。(一)作为图像史料的... 详细信息

五、图像史料与文化史研究的连接与跨越,图像史料的微观研究与历史叙事的有效性固然有紧密联系,其在宏观视野上的作用与意义也是历史图像学和文化史研究的连接处,最后成为回应“历史学还是图像学”的一个重要节点。(一)作为图像史料的“巴约挂毯”关于“将图像写成有意义的话语”及“历史叙事的有效性”,中世纪的艺术品“巴约挂毯”(Bayeux Tapestry,一译“贝叶挂毯”)是一个著名的研究案例。

关键词：文化史研究图像学 Tapestry 微观研究重要节点宏观视野巴约历史叙事

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硅基LHP蒸发器传热特性研究

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工程热物理学报 2024年第1期45卷 241-245页

作者：周东方陈岩柳洋秦宁辛公明山东大学能源与动力工程学院济南250061 山东大学深圳研究院深圳518063

硅基环路热管作为一种高效两相传热装置可应用于集成电路热管理。本文设计并制备了一种硅基微柱阵列毛细结构以期用作硅基环路热管蒸发器,搭建了毛细蒸发实验系统,探究了热流密度以及工作角度等变化对蒸发器传热性能的影响。研究结果发... 详细信息

硅基环路热管作为一种高效两相传热装置可应用于集成电路热管理。本文设计并制备了一种硅基微柱阵列毛细结构以期用作硅基环路热管蒸发器,搭建了毛细蒸发实验系统,探究了热流密度以及工作角度等变化对蒸发器传热性能的影响。研究结果发现:热流密度越高,蒸发器启动速度越快,稳定运行温度越高;蒸发器在工作角度180?时的性能优于0°,在工作角度90°时的性能优于270°。本文关于硅基蒸发器性能研究可为后续相关环路热管的优化设计提供数据支撑。

关键词：硅基微柱阵列环路热管毛细蒸发毛细芯

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Recycling combustibles from aged municipal solid wastes(MSW)to improve fresh MSW incineration in Shanghai:Investigation of necessity and feasibility

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Frontiers of Environmental Science & Engineering 2010年第2期4卷 235-243页

作者： Dezhen CHEN Zhenzhen GUAN Guangyu LIU gongming zhou Tong ZHU Thermal&Environmental Engineering Institute Tongji UniversityShanghai 200092China National Engineering Research Center for Urban Pollution Control Tongji UniversityShanghai 200092China

Aged municipal solid wastes(MSW)excavated from landfills and dumpsites were characterized to analyze their fraction composition,moisture content,and lower heat value(LHV).The necessity and feasibility of recycling combustibles from aged MSW to improve the incineration of fresh MSW were investigated.The results showed that combustibles in aged MSW were easily separated from other components and than LHV of the separated combustibles are higher than 11000 kJ/kg.The fresh MSW are of high moisture contents with average LHV below 6500 kJ/kg,making their stable combustion difficult to maintain in MSW incinerators.For both fresh MSW and aged MSW,plastics are the main contributor to their LHV.To improve incineration of fresh MSW that are characterized with low LHV,combustibles separated from aged MSW were made into refuse derived fuel(RDF)pellets and were then added to fresh MSW by 2%wt.–5%wt.LHV variation and air supply resistance change of the MSW layer on the incinerator grate caused by the addition of RDF was checked,and no significant changes were found.No obvious difference was observed for the‘burn-out time’between RDF pellets and fresh MSW either.RDF made from aged MSW combustibles is found to be a promising auxiliary fuel to improve the incineration of fresh MSW,and aged MSW from old landfill cells and dumpsites can be finally disposed of jointly with fresh MSW by recycling combustible from the former to be coincinerated with the latter in the incineration plants.

关键词： aged municipal solid wastes(MSW) fresh MSW lower heat value(LHV) combustibles refuse derived fuel(RDF) incineration

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纳米氧化锌和SDS促进二氧化碳水合物生成特性实验研究

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低碳化学与化工 2024年第6期49卷 129-140页

作者：崔茂辛公明李德祥山东大学能源与动力工程学院山东济南250061

水合物法捕集和封存二氧化碳(CO_(2))具有储气量高和成本低等优点,但生成CO_(2)水合物(简称“水合物”)的诱导时间长、生成速率缓慢限制了该方法的应用。为促进水合物的生成,采用恒容法研究了纳米氧化锌(ZnO)和十二烷基硫酸钠(SDS)对水... 详细信息

水合物法捕集和封存二氧化碳(CO_(2))具有储气量高和成本低等优点,但生成CO_(2)水合物(简称“水合物”)的诱导时间长、生成速率缓慢限制了该方法的应用。为促进水合物的生成,采用恒容法研究了纳米氧化锌(ZnO)和十二烷基硫酸钠(SDS)对水合物生成的影响。结果表明,在一定条件下增大初始压力和引入机械搅拌可以促进水合物生成,并且单独添加纳米ZnO或SDS均能显著缩短诱导时间。其中,在ZnO质量分数为0.06%和275.65 K的条件下,确定了初始压力和搅拌速率的最优值分别为4.5 MPa和500 r/min。在3.5 MPa、275.65 K和300 r/min的条件下,加入质量分数为0.10%、粒径为50 nm的纳米ZnO(ZnO-50)体系的诱导时间为41.6 min,较纯水体系的诱导时间(487.4 min)缩短了91.5%。体系中ZnO-50的质量分数为0.06%时,气体消耗总量为0.903 mol,较纯水体系的气体消耗总量(0.444 mol)提高了103.4%。提高SDS的质量分数对气体消耗总量的促进效果逐渐增强,当体系中SDS的质量分数为0.10%时,气体消耗总量达到最大(1.027 mol),比纯水体系的气体消耗总量提高了131.3%。以质量分数为0.10%的SDS与质量分数为0.02%的ZnO-50构建协同体系,其气体消耗总量(1.045 mol)受相平衡压力的影响变化不大,但可以显著加快水合物生成速率,实验半程(反应5 h)的气体消耗量可达0.924 mol,占实验全程(反应10 h)气体消耗总量的88.4%,明显高于单独使用质量分数为0.02%的ZnO-50和质量分数为0.10%的SDS体系的相应数据(分别为63.7%和48.5%)。相关研究结果可为应用水合物技术进行CO_(2)捕集和封存提供一定的理论指导。

关键词：水合物纳米氧化锌十二烷基硫酸钠诱导时间气体消耗量

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