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Co_(3)O_(4)-C@Al_(2)O_(3)活化过一硫酸盐耦合化学沉淀去除EDTA-Ni及其机理研究

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环境科学学报 2023年第7期43卷 148-159页

作者：黄振华孙水裕关智杰廖小健陈少金莫志华周星帆侯树梁戴文灿广东工业大学环境科学与工程学院广州510006 广东环境保护工程职业学院佛山528216 广东生态工程职业学院广州510520

乙二胺四乙酸-镍(EDTA-Ni)广泛存在于多种工业废水中,浓度低,处理难度大,对水体环境及人体健康具有毒害作用,因此急需寻求一种深度处理方法.本研究采用浸渍煅烧法,以氧化铝(Alumina,Al_(2)O_(3))为基体,负载碳层及四氧化三钴(cobalt oxi... 详细信息

乙二胺四乙酸-镍(EDTA-Ni)广泛存在于多种工业废水中,浓度低,处理难度大,对水体环境及人体健康具有毒害作用,因此急需寻求一种深度处理方法.本研究采用浸渍煅烧法,以氧化铝(Alumina,Al_(2)O_(3))为基体,负载碳层及四氧化三钴(cobalt oxide,Co3O4),合成一种高效的催化剂Co_(3)O_(4)-C@Al_(2)O_(3),用于活化过一硫酸盐(Peroxymonosulfate,PMS)进行氧化破络(Co_(3)O_(4)-C@Al_(2)O_(3)/PMS),耦合化学沉淀去除水中的EDTA-Ni.本文优化Co_(3)O_(4)-C@Al_(2)O_(3)的制备条件,考察Co_(3)O_(4)-C@Al_(2)O_(3)/PMS-OH体系去除EDTA-Ni的效果.结果表明,在初始pH=3.8,PMS=0.6 g·L^(-1),催化剂投加量=0.8 g·L^(-1)和EDTA-Ni初始浓度为5 mg·L^(-1)的条件下,反应30 min后,99.31%的EDTA-Ni被去除,出水总Ni浓度稳定低于0.1 mg·L^(-1),达到广东省《电镀水污染物排放标准》(DB44/1597-2015)表3规定的排放标准.经过淬灭实验、电子顺磁共振(EPR)和化学探针法分析,发现OH·、SO_(4)^(-)·、1 O2均存在于Co_(3)O_(4)-C@Al_(2)O_(3)/PMS体系中,高价态钴也是重要的反应中间体.通过自由基、高价钴和非自由基途径,EDTA-Ni被氧化破络,而后Ni被碱沉淀去除.综上所述,Co_(3)O_(4)-C@Al_(2)O_(3)具有良好的稳定性和可重复性,具有降解实际废水中络合态重金属污染物的巨大潜力.

关键词： EDTA-Ni 过一硫酸盐(PMS) Co_(3)O_(4)-C@Al_(2)O_(3) 非自由基途径高价态钴

响应曲面法优化KOH改性污泥生物炭的制备及其强化去除Pb(Ⅱ)的研究

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环境科学学报 2022年第8期42卷 194-207页

作者：周佳丽林伟雄关智杰廖小健高建明黄振华孙水裕黄明珠徐廷国区雪连广东工业大学环境科学与工程学院广州510006 肇庆学院环境与化学工程学院肇庆526061 广东环境保护工程职业学院佛山528216 佛山市水业集团有限公司佛山528000

采用响应曲面法优化了KOH改性污泥生物炭(SB-KOH)的制备条件,研究了各因素之间对生物炭吸附性能的交互影响,并且探讨了KOH强化生物炭吸附能力的机制.同时,研究了吸附时间、吸附温度及pH对SB-KOH吸附Pb(Ⅱ)的影响,探讨其吸附机理.结果表... 详细信息

采用响应曲面法优化了KOH改性污泥生物炭(SB-KOH)的制备条件,研究了各因素之间对生物炭吸附性能的交互影响,并且探讨了KOH强化生物炭吸附能力的机制.同时,研究了吸附时间、吸附温度及pH对SB-KOH吸附Pb(Ⅱ)的影响,探讨其吸附机理.结果表明:KOH浸渍浓度是最显著因素,较高浸渍浓度有利于提高SB-KOH的吸附性能;增加KOH浸渍浓度和升高热解温度可以协同提高SB-KOH的吸附性能;最佳制备条件为2.5 mol·L^(-1)的KOH浸渍浓度、7 h的浸渍时间、631℃的热解温度和44 min的热解时间.KOH改性后的污泥生物炭表面粗糙,比表面积增大,微孔数量增加,SB-KOH的比表面积为141.22 m2·g^(-1),是原污泥生物炭(SB,5.93 m2·g^(-1))的24倍,改性后的生物炭碱性提高、K元素含量增加.SB-KOH吸附Pb(Ⅱ)是以化学吸附为主的多分子层混合吸附,膜扩散是主要的速率控制步骤,增加溶液pH、提高温度可促进吸附.吸附机制涉及矿物沉淀(Qmp)、离子交换(Qie)、含氧官能团的络合(Qoc)和金属π键结合(Qmπ),不同吸附机理的贡献顺序为:Qmp(143.5 mg·g^(-1))>Qie(39.67 mg·g^(-1))>Qoc(8.56 mg·g^(-1))>Qmπ(1.65 mg·g^(-1)),KOH改性强化了生物炭对Pb(Ⅱ)的矿物沉淀和离子交换吸附量.本研究丰富了KOH改性污泥生物炭的制备理论,阐明了SB-KOH吸附Pb(Ⅱ)吸附机理及其影响的主要机制.

关键词：曲面优化污泥生物炭 KOH改性 Pb(Ⅱ) 吸附机制

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一锅三步由硝基芳烃合成邻氨基酚衍生物

Effect of Post-Added Water Amount on Pre-Concentrated Bark Foaming Materials by Mechanical Stirring

大学化学 2022年第5期37卷 173-180页

作者：孙承博张珠宝陈艺中匡禹豪廖小建冯鹏举暨南大学化学与材料学院广州510632

硝基的选择性还原,羟胺的选择性保护,以及[3,3]-σ重排都是有机化学的基础内容.本实验将此三个基本反应融入于3.5 h的紧凑一锅法化学反应中,反应现象丰富且便于观察,利用薄层色谱能方便监测反应的进程.反应可以从简单的硝基芳烃一锅获... 详细信息

硝基的选择性还原,羟胺的选择性保护,以及[3,3]-σ重排都是有机化学的基础内容.本实验将此三个基本反应融入于3.5 h的紧凑一锅法化学反应中,反应现象丰富且便于观察,利用薄层色谱能方便监测反应的进程.反应可以从简单的硝基芳烃一锅获取高官能化邻氨基酚衍生物,同时三步反应可以分解为三个单独的反应,且均能高收率得到相应化合物.产物可由硅胶柱层析纯化,化合物结构通过质谱、核磁共振波谱的解析进一步确定.该反应立足有机化学硝基官能团基础知识,适用于本科生学习官能团转化知识,观测多种实验现象,同时反应操作多样,用时紧凑,产率高,在邻氨基酚类衍生物制备中具有广泛的应用潜力.

关键词：一锅法选择性还原羟胺选择性保护 [3 3]-σ重排邻氨基酚

来源：博看期刊评论

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Journal of Renewable Materials 2020年第12期8卷 1607-1616页

作者： Jinxing Li Jingjing liao Jun Zhang xiaojian Zhou Hisham Essawy Guanben Du Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products Southwest Forestry UniversityKunming650224China Key Laboratory for Forest Resources Conservation and Utilisation in the Southwest Mountains of China(Southwest Forestry University) Ministry of EducationKunming650224China Department of Polymers and Pigments National Research CentreCairo12622Egypt

In this study,pre-concentrated bark,furfuryl alcohol and other biomass raw materials were used to prepare foaming materials by high-speed mechanical stirring without using a foaming *** investigated the effect of the postadded water amount on the properties of foaming *** particular,we determined basic physical properties of these materials,including the limiting oxygen index(LOI),porosity,thermal conductivity,thermogravimetric analysis,pore size distribution,and *** results of scanning electron microscopy(SEM)indicated that the pore size distribution was uniform and the pore size increased with increasing water *** analysis(TG/DTG)showed that when the temperature reached 410°C,the foam was easily decomposed,the final residual mass was only 2.8%,and water addition had little effect on ***,the amount of post-added water is 5–30 g,the density and compression strength of the foamed materials gradually decreased,while the degree of pulverization *** ranged from 26.1%to 30.79%,and porosity ranged from 81%to 83%.The change in water volume greatly affected the foam’s performance,the performance of foamed material deteriorated as the amount of added water increased,but the effect on thermal conductivity was not very *** highest thermal conductivity was only 0.0179 W/(m·K),still providing excellent thermal insulation.

关键词： Pre-concentrated bark mechanical whipping foamed material performance characterization

Ammonium removal pathways and microbial community in GAC-sand dual media filter in drinking water treatment

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Journal of Environmental Sciences 2012年第9期24卷 1587-1593页

作者： Shuo Feng Shuguang Xie xiaojian Zhang Zhiyu Yang Wei Ding Xiaobin liao Yuanyuan Liu Chao Chen School of Environment Tsinghua University Beijing 100084 China. College of Environmental Sciences and Engineering Peking University Beijing 100871 China Dongguan Dongjiang Water Company Limited Dongguan 523000 China

A GAC-sand dual media filter （GSF） was devised as an alternative solution for drinking water treatment plant to tackle the raw water polluted by ammonium in place of expensive ozone-GAC processes or bio-pretreatments. The ammonium removal pathways and microbial community in the GSFs were investigated. The concentrations of ammonium, nitrite and nitrate nitrogen were monitored along the filter. Total inorganic nitrogen （TIN） loss occurred during the filtration. For 1 mg ammonium removal, the TIN loss was as high as 0.35 mg, DO consumption was 3.06 mg, and alkalinity consumption was 5.55 rag. It was assumed that both nitrification and denitrification processes occur in the filters to fit the TIN loss and low DO consumption. During the filtration, nitritation, nitrification and nitritation-anaerobic ammonium oxidation processes probably occur, while traditional nitrification and denitrification and simultaneous nitrification and denitrification processes may occur. In the GSFs, Nitrosomonas and Nitrospira are likely to be involved in nitrification processes, while Novosphingobium, Comamonadaceae and Oxalobacteraceae may be involved in denitrification processes.

关键词： nitritation nitrification nitritation-anaerobic ammonium oxidation nitrification and denitrification

Development of Antioxidant Packaging Film Based on Chinese Bayberry Tannin Extract and Polyvinyl Alcohol

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Journal of Renewable Materials 2022年第1期10卷 19-31页

作者： Jingjing liao Jinxing Li Hongyan Wang Yan Zhu Hisham Essawy Guanben Du xiaojian Zhou Beijing Forestry University Beijing100083China Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products Southwest Forestry UniversityKunming650224China Zhejiang Academy of Forestry Hangzhou310023China Department of Polymers and Pigments National Research CentreCairo12622Egypt

The current work explores the potential use of commercial Chinese bayberry tannin(BT)to develop antioxidant PVA-based films using solvent casting process for packaging *** effect of BT concentration on opa-city,water resistance and antioxidant capacity of resulting films was *** like tensile strength,thermal behavior,and morphological aspects were also *** experimental results showed that PVA/BT films formed with uniformly brown color and generally good transparency,offering good antioxidant *** PVA film containing BT presented slightly higher water resistance according to the results of moisture content and water vapor permeability,especially at low BT content(<10 wt%).The PVA can be compounded with up to 10 wt%BT without any obvious deterioration in the tensile *** PVA/BT films exhibited better thermal degradation behavior compared with PVA alone because of the chemical bonds of PVA-BT and the for-mation of char at high *** on the results,PVA incorporated with Chinese bayberry tannin may provide broader formulation options for packaging materials with antioxidant action.

关键词： Polyvinyl alcohol film Chinese bayberry tannin antioxidant packaging material

Circulating endothelial microvesicles and their carried miR-125a 5p:potential biomarkers for ischaemic stroke

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Stroke & Vascular Neurology 2023年第2期8卷 89-102页

作者： Xiaotang Ma Xiaorong liao Jiehong Liu Yan Wang Xiang Wang Yanfang Chen xiaojian Yin Qunwen Pan Department of Neurology Affiliated Hospital of Guangdong Medical UniversityZhanjiangChina Pharmacology and Toxicology Wright State University Boonshoft School of MedicineDaytonOhioUSA

Background Endothelial microvesicles(EMVs)are closely associated with the status of endothelial cells(ECs).Our earlier study has shown that EMVs could exert protective roles in ECs by transferring their carried miR-125a ***,whether circulating EMVs and their carried miR-125a 5p can be used as biomarkers in ischaemic stroke(IS)are remain *** We recruited 72 subjects with IS,60 subjects with high stroke risk and 56 age-matched *** circulating EMVs and their carried miR-125a 5p(EMV-miR 125a 5p)levels were *** used microRNA(miR)array to study expression changes of miRs in plasma EMVs samples of three IS patients and three matched healthy *** middle cerebral artery occlusion(tMCAO)was used to establish IS mouse *** EMVs level was obviously elevated in IS patients,with the highest level in acute stage,and was positively related to carotid plaque,carotid intima-media thickness(IMT),National Institutes of Health Stroke Scale(NIHSS),infarct *** the contrary,we observed that EMV-miR 125a 5p level was obviously reduced in IS,with the lowest level in acute stage,and was negatively correlated with carotid plaque,IMT,NIHSS scores,infarct *** and EMV-miR 125a 5p levels were closely related with large artery atherosclerosis ***,EMVs and EMV-miR 125a 5p levels could serve as independent risk factors,and receiver operating characteristic curve achieved an area under curve(AUC)of 0.720 and 0.832 for IS,respectively,and elevated to 0.881 after their *** IS mouse model,control EMVs or n-EMVs administration could decrease the infarct volume and neurological deficit score,while increase the cerebral blood flow of IS mice compared with vehicle group,while IS EMVs or oxygen and glucose deprivation(OGD)-EMVs administration aggravated the tMCAO induced ischaemic *** addition,we observed that OGD EMVmiR-125a 5p could partially ameliorate the OGD EMVs induced brain injury after ***

关键词： miR elevated protective

面向结构化道路的智能驾驶轨迹规划一致性研究

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汽车工程 2024年第3期46卷 383-395,430页

作者：吴晓建廖平伟雷耀江会华王爱春胡家琦南昌大学先进制造学院南昌330031 江铃汽车股份有限公司南昌330001 南昌航空大学测试与光电工程学院南昌330038 比亚迪股份有限公司深圳518119

智能车在动态环境中的轨迹规划须具备良好的舒适性及安全性,离散采样轨迹规划算法具有实时性高、多目标最优等优点而被广泛研究和应用,但在仿真及实车测试中发现,典型的基于多项式优化求解的离散采样局部轨迹规划结果在换道等瞬态过程... 详细信息

智能车在动态环境中的轨迹规划须具备良好的舒适性及安全性,离散采样轨迹规划算法具有实时性高、多目标最优等优点而被广泛研究和应用,但在仿真及实车测试中发现,典型的基于多项式优化求解的离散采样局部轨迹规划结果在换道等瞬态过程存在一致性较差的问题。本文针对性提出一种考虑一致性评价的“拼接+强规划”轨迹规划算法。具体而言,根据自车状态截取历史轨迹为当前周期拼接轨迹,结合拼接轨迹和轨迹末状态采样点生成基于多项式的候选轨迹簇作为轨迹强规划阶段,再基于轨迹横向偏差设计轨迹一致性评价函数以从轨迹簇中选取较高一致性的最优行驶轨迹。经仿真和真实道路场景实车验证,表明所提出的轨迹规划方法在满足轨迹安全性、平顺性、舒适性要求的基础上提高了智能驾驶车辆行驶轨迹的整体一致性。

关键词：智能驾驶局部轨迹规划轨迹一致性避障

Assisted Compatibility, and Balanced Regulation of the Mechanical, Thermal, and Antioxidant Activity of Polyvinyl Alcohol-Chinese Bayberry Tannin Extract Films Using Different Di-Aldehydes as Cross-Linkers

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Journal of Renewable Materials 2022年第2期10卷 359-372页

作者： Jingjing liao Jinxing Li Fuxian Yang Yan Zhu Hongyan Wang Guanben Du Hisham Essawy xiaojian Zhou Beijing Forestry University Beijing100083China Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products Southwest Forestry UniversityKunming650224China Zhejiang Academy of Forestry Hangzhou310023China Department of Polymers and Pigments National Research CentreCairo12622Egypt

Polyvinyl alcohol(PVA)-based films containing Chinese bayberry tannin(BT)were prepared by cross-linking using glyoxal,glutaraldehyde and dialdehyde starch,*** presence of cross-linkers was evident to promote the transparency and decrease the moisture content of PVA/BT films,while the water solubility stayed almost unchanged in the cross-linked PVA/*** cross-linkers provided promotion of the water vapor per-meability,mechanical property and thermal stability of PVA/BT *** best water vapor barrier capacity was found in case of glutaraldehyde cross-linked PVA/BT film,while the highest tensile strength was encountered in case of glyoxal cross-linked PVA/BT films,compared with the uncross-linked *** scavenging action of the films towards DPPH radical activity was influenced by the nature of each ***,the PVA/AT film cross-linked by glutaraldehyde acquired the lowest radical scavenging activity in a certain time,suggesting that glutaraldehyde decreased the release rate of BT from *** on the experimental data,glutaraldehyde and dialdehyde starch could be more suitable for PVA/BT film preparation since they can promote the intermo-lecular interaction of PVA and BT to a reasonable extent.

关键词： Polyvinyl alcohol Chinese bayberry tannin cross-linker mechanical performance antioxidant activity