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Demulsification Behavior, Characteristics, and Performance of Surfactant Stabilized Oil-in-Water Emulsion under Bidirectional Pulsed Electric Field

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China Petroleum Processing & Petrochemical Technology 2023年第1期25卷 10-22页

作者： Ren Boping Kang Yong Zhang Xianming gong haifeng Chen Ling Liu Yunqi Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Technology and Business UniversityChongqing 400067China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580China

As a novel electric demulsification method,bidirectional pulsed electric field(BPEF)was employed to demulsify the surfactant stabilized oil-in-water(SSO/W)emulsion for oil/water separation in this *** demulsification behavior,characteristics,and stages under BPEF were *** was discovered that BPEF drove SSO/W emulsion to move and form vortexes,during which the oil droplets aggregated and accumulated to generate an oil droplet layer(ODL).ODL subsequently transformed into a continuous oil layer(COL)leading to the demulsification and separation of SSO/W *** conversion rate of ODL to COL was defined and used to evaluate the demulsification process and reflect the coalescence ability and transformation efficiency of dispersed oil droplets into ***,the effects of BPEF voltage,frequency,duty cycle,ratio of pulse output time,and surfactant type and content on the demulsification performance were *** optimal values of BPEF parameters for demulsification operation were 400 V,25 Hz,50%,and 4:1.O/W emulsion containing anionic surfactant was apt to be demulsified by BPEF,nonionic surfactant took the second place and cationic surfactant was the most difficult.A high surfactant content was not conducive to the BPEF *** work is anticipated to provide useful guidance for oil/water separation and oil recovery from actual emulsified oily wastewater by BPEF.

关键词： oil-in-water emulsion surfactant demulsification bidirectional pulsed electric field

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High-efficiency crystalline carbon nitride photocatalysts:Status and perspectives

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Nano Research 2024年第9期17卷 7840-7863页

作者： Wenji Pu Yunqiao Zhou Lingfeng Yang haifeng gong Yuhan Li Qingyu Yang Dieqing Zhang Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Key Laboratory of Catalysis and New Environmental MaterialsChongqing Technology and Business UniversityChongqing 400067China The Education Ministry Key Lab of Resource Chemistry Joint International Research Laboratory of Resource Chemistry of Ministry of EducationShanghai Key Laboratory of Rare Earth Functional Materialsand Shanghai Frontiers Science Center of Biomimetic CatalysisShanghai Normal UniversityShanghai 200234China State Key Laboratory of Tibetan Plateau Earth System Resources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Crystallinity and crystal structure greatly influence the photocatalytic behavior of *** g-C3N4 produced by traditional thermal-induced polycondensation reaction bears low crystallinity and thus poor photoactivity,which originates from the incomplete polymerization of the precursor containing amine groups,abundant hydrogen bonds,and unreacted amino,as well as cyanide functional groups in the *** photocatalytic process,these residual functional groups often work as electron trap sites,which may hinder the transfer of electrons on the plane,resulting in low ***,crystalline carbon nitride(CCN)was reported as a promising photocatalyst because its increased crystallinity not only reduces the number of carriers recombination centers,but also increases charge conductivity and improves light utilization due to extendedπ-conjugated systems and delocalizedπ-*** such,we summarize the recent studies on CCN-based photocatalysts for the photoactivity ***,the unique structure and properties of CCN materials are ***,the preparation methods and modification strategies are well *** also sum up the applications of CCN-based materials in the environmental purification and energy ***,this review concerning CNN materials ends with prospects and challenges in the obtainment of high crystallinity by effective techniques,and the deep understanding of photocatalytic mechanism.

关键词： crystalline carbon nitride preparation method modification strategy photocatalytic application

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Severe rectal burn induced by hot normal saline enema:a case report

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Gastroenterology Report 2022年第1期10卷 638-640页

作者： Xiaoming Zhu Siyuan Jiang Chen Wang haifeng gong Wei Zhang Department of Colorectal Surgery Changhai HospitalShanghaiP.R.China

Case report A 44-year-old woman was admitted to our emergency room with a diagnose of rectal burn due to an accidental hot normal saline enema before oophorocystectomy in a local hospital 8 days *** reported hypogastralgia and burning pain on the buttocks immediately when the enema was *** enema was stopped instantly and she was treated with fasting,antibiotics,glucocorticoids,and parenteral nutrition for a ***,the above symptoms did not resolve.

关键词： admitted rectal stopped

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Embolization of blood-supply artery followed by surgery for treatment of mesorectal Castleman’s disease:case report and literature review

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Gastroenterology Report 2019年第2期7卷 141-145,I0002页

作者： Guanyu Yu Fuao Cao haifeng gong Peng Liu Ge Sun Wei Zhang Department of Colorectal Surgery Changhai HospitalShanghaiChina

A 23-year-old male patient was diagnosed as having a hypervascular pelvic mass by ultrasonography and magnetic resonance examination.A pathology puncture showed vitreous vascular Castleman’s *** of concerns about tumor blood supply,embolization under digital subtraction angiography(DSA)was performed on the artery of the pelvic tumor before resection of the mass and surrounding ***’s disease of pelvic lymph node(mixed type,mainly hyaline vascular type)was confirmed pathologically from postoperative *** of the blood-supply artery of a hypervascular mass should be considered before surgery is performed.

关键词： Castleman’s disease mesorectal tumor embolization

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Enhanced mixing state of black carbon with nitrate in single particles during haze periods in Zhengzhou, China

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Journal of Environmental Sciences 2022年第1期34卷 185-196页

作者： Qianni Zhou Chunlei Cheng Suxia Yang Minghao Yuan Jingjing Meng haifeng gong Qien Zhong Yao Zhang Yutong Xie Zhen Zhou Mei Li Institute of Mass Spectrometry and Atmospheric Environment Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air PollutionJinan UniversityGuangzhou 510632China Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou 510632China School of Environment and Planning Liaocheng UniversityLiaocheng 252000China Institute for Environment and Climate Research Jinan UniversityGuangzhou 510632China Zhengzhou Environmental Protection Monitoring Center Station Zhengzhou 450007China

Black carbon(BC)plays an important role in air quality and climate change,which is closely associated with its mixing state and chemical *** this work the mixing state of BC-containing single particles was investigated to explore the evolution process of ambient BC particles using a single particle aerosol mass spectrometer(SPAMS)in March 2018 in Zhengzhou,*** BC-containing particles accounted for 61.4%of total detected ambient single particles and were classified into five types including BC-nitrate(BC-N,52.3%)as the most abundant species,followed by BC-nitrate-sulfate(BC-NS,22.4%),BCOC(16.8%),BC-fresh(BC-F,4.5%)and BC-sulfate particles(BC-S,4.0%).With enhancement of the ambient nitrate concentration,the relative peak area(RPA)of nitrate in BC-N and BC–NS particles both increased,yet only the number fraction(N_(f))of BC–N particles increased while the N_(f) of BC-NS particles decreased,suggesting that the enhanced mixing state of BC with nitrate was mainly due to the increase in the ambient nitrate mass *** addition,the Nfof BC-N decreased from 65.3%to 28.4%as the absorbing Angstrom exponents(AAE)of e BC increased from 0.75 to 1.45,which indicated the reduction of light absorption ability of aged BC particles with the enhanced formation of BC-N *** results of this work indicated a change in the mixing state of BC particles due to the dominance of nitrate in PM_(2.5),which also influenced the optical properties of aged BC particles.

关键词： Single particle Black carbon Mixing state Nitrate Aging process

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油液黏度对脉冲电场最佳破乳频率的影响

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石油学报（石油加工） 2013年第1期29卷 168-173页

作者：龚海峰彭烨重庆理工大学重庆汽车学院重庆400054 重庆钢铁集团重庆400080

通过建立油中乳胶粒子在脉冲电场作用下的非线性振动动力学模型,研究了粒子非线性参激共振及其条件,得出脉冲电场最佳破乳频率关系式。结果表明,油中乳胶粒子最佳破乳频率及其共振振幅随油液黏度的增大而减小。利用模型得出的乳胶粒子... 详细信息

通过建立油中乳胶粒子在脉冲电场作用下的非线性振动动力学模型,研究了粒子非线性参激共振及其条件,得出脉冲电场最佳破乳频率关系式。结果表明,油中乳胶粒子最佳破乳频率及其共振振幅随油液黏度的增大而减小。利用模型得出的乳胶粒子振动幅频特性关系在理论上解释了油液黏度对最佳破乳频率产生的影响,以及最佳破乳频率偏离粒子振动固有频率的成因。

关键词：黏度最佳破乳频率参激共振乳胶粒子脉冲电场

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Defective Nickel-Iron Layered Double Hydroxide for Enhanced Photocatalytic NO Oxidation with Significant Alleviation of NO2 Production

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Engineering 2024年第5期36卷 276-284页

作者： Xiaoyu Li Xiaoshu Lv Jian Pan Peng Chen Huihui Peng Yan Jiang haifeng gong Guangming Jiang Li’an Hou Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Technology and Business UniversityChongqing 400067China State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Environmental Technology Innovation Center of Jiande Hangzhou Bertzer Catalyst Co.Ltd.Hangzhou 310058China Chongqing Key Laboratory of Green Synthesis and Application College of ChemistryChongqing Normal UniversityChongqing 401331China

Photocatalysis offers a sustainable means for the oxidative removal of low concentrations of NOx(NO,NO2,N2O,N2O5,etc.)from the *** double hydroxides(LDHs)are promising candidate photocatalysts owing to their unique layered and tunable chemical structures and abundant surface hydroxide(OH)moieties,which are hydroxyl radical(OH)***,the practical applications of LDHs are limited by their poor charge-separation ability and insufficient active ***,we developed a facile N_(2)H_(4)-driven etching approach to introduce dual Ni^(2+)and OHvacancies(Niv and OHv,respectively)into NiFe-LDH nanosheets(hereafter referred to as NiFe-LDH-et)to facilitate improved charge-carrier separation and active Lewis acidic site(Fe^(3+)and Ni^(2+)exposed at OHv)*** contrast to inert pristine LDH,NiFe-LDH-et actively removed NO under visible-light ***,Ni_(76)Fe_(24)-LDH-et etched with 1.50 mmol·L^(-1)N_(2)H_(4)solution removed 32.8%of the NO in continuously flowing air(NO feed concentration:500 parts per billion(ppb))under visible-light illumination,thereby outperforming most reported *** and theoretical data revealed that the dual vacancies promoted the production of reactive oxygen species(O_(2)·^(-)andOH)and the adsorption of NO on the *** situ spectroscopy demonstrated that NO was preferentially adsorbed at Lewis acidic sites,particularly exposed Fe^(3+)sites,converted into NO+,and subsequently oxidized to NO3without the notable formation of the more toxic intermediate NO2,thereby alleviating risks associated with its production and emission.

关键词： Vacancie Layered double hydroxide NO+ Photocatalysis NO removal

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蒙元时期的“奄出”及其相关问题

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西北民族研究 2009年第1期 42-62,176页

作者：宫海峰南京大学历史系东南大学日语系

“奄出”在大蒙古国社会制度中占据十分重要的地位。正确认知“奄出”，对于深入理解蒙元时期的社会结构及草原社会的组织形式和财产观念应该是具有重要意义的课题。本文试图通过解读《元朝秘史》、《元典章》、《大元马政记》等蒙元时... 详细信息

“奄出”在大蒙古国社会制度中占据十分重要的地位。正确认知“奄出”，对于深入理解蒙元时期的社会结构及草原社会的组织形式和财产观念应该是具有重要意义的课题。本文试图通过解读《元朝秘史》、《元典章》、《大元马政记》等蒙元时期的史料，讨论“奄出”、“忽必”以及由此引申出来的“奄出忽必”、“奄出亦儿坚”和“引者”等问题。

关键词：奄出忽必奄出忽必(梯己分子) 引者

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乳化油液中椭球形水滴间电场力的理论计算

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化工学报 2009年第7期60卷 1719-1724页

作者：龚海峰宋世远彭烨解放军后勤工程学院油料应用与管理工程系重庆400016 重庆钢铁集团重庆400080

电场破乳过程中,乳化油液中椭球形水滴间的电场力目前尚未有好的理论求解方法。通过建立水滴的"二分子"椭球模型,利用坐标变换把椭球问题转换成圆球问题,并运用双球面坐标和Maxwell应力张量理论,推导出两椭球水滴间的径向和切向电场力... 详细信息

电场破乳过程中,乳化油液中椭球形水滴间的电场力目前尚未有好的理论求解方法。通过建立水滴的"二分子"椭球模型,利用坐标变换把椭球问题转换成圆球问题,并运用双球面坐标和Maxwell应力张量理论,推导出两椭球水滴间的径向和切向电场力的表达式。算例结果表明,"二分子"椭球模型计算的大间隔椭球水滴间电场力与偶极子圆球模型的计算结果基本一致,吸引-排斥临界角经修正后与Eow的实验结果基本吻合;模型可计算小间隔水滴间的电场力及作用临界角,计算数值均大于大间隔水滴情况下的计算结果,体现了水滴间隔对水滴表面极化电荷分布产生的影响。

关键词： “二分子” 模型电场力椭球形水滴双球坐标系 Maxwell应力张量

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双表面润湿特性组合筛网分离油-水乳化液

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石油学报（石油加工） 2022年第6期38卷 1483-1492页

作者：吴云龚海峰重庆工商大学废油资源化技术与装备工程研究中心重庆400067

通过CuCl_(2)-HCl溶液浸渍及硬脂酸(STA)表面修饰相结合的方法分别制备了具有超疏水/超亲油和超亲水/超亲油润湿特性的不锈钢筛网膜,并利用环氧树脂AB胶将2种不同润湿特性的筛网黏结后,得到具有双表面润湿特性的组合筛网,采用组合筛网... 详细信息

通过CuCl_(2)-HCl溶液浸渍及硬脂酸(STA)表面修饰相结合的方法分别制备了具有超疏水/超亲油和超亲水/超亲油润湿特性的不锈钢筛网膜,并利用环氧树脂AB胶将2种不同润湿特性的筛网黏结后,得到具有双表面润湿特性的组合筛网,采用组合筛网作为分离部件的实验装置对水包油(O/W)型乳液进行分离,考察组合筛网层间距和孔径对分离效果的影响。结果表明,该组合筛网能够分离无表面活性剂和表面活性剂稳定的O/W型乳液,具有很高的分离效率(提取液质量分数均不小于98%)。当两层筛网层间距为0.3 mm,第一层、第二层筛网孔径分别为0.100、0.180 mm时,其分离效果最佳。

关键词：油-水分离不锈钢网润湿性双表面环氧树脂AB胶

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