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Flocculating characteristic of activated sludge flocs:Interaction between Al^(3+) and extracellular polymeric substances

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Journal of Environmental Sciences 2013年第5期25卷 916-924页

作者： Xiaodong Ruan Lin Li Junxin Liu Research Center for Eco-Environmental Science Chinese Academy of Sciences

aluminum flocculant can enhance the flocculating performance of activated ***,the binding mechanism of aluminum ion（Al 3＋） and extracellular polymeric substances（EPS） in activated sludge is unclear due to the complexity of *** this work,threedimensional excitation emission matrix fluorescence spectroscopy（3DEEM）,fluorescence quenching titration and Fourier transform infrared spectroscopy（FT-IR） were used to explore the binding behavior and mechanism between Al 3＋ and *** results showed that two fluorescence peaks of tyrosineand tryptophan-like substances were identified in the loosely bound-extracellular polymeric substances（LB-EPS）,and three peaks of tyrosine-,tryptophanand humic-like substances were identified in the tightly boundextracellular polymeric substances（TB-EPS）.It was found that these fluorescence peaks could be quenched with Al 3＋ at the dosage of 3.0 mg/L,which demonstrated that strong interactions took place between the EPS and Al 3＋.The conditional stability constants for Al 3＋ and EPS were determined by the Stern-Volmer *** to the binding mechanism,the-OH,N-H,C=O,C-N groups and the sulfurand phosphorus-containing groups showed complexation action,although the groups in the LB-EPS and TB-EPS showed different *** TB-EPS have stronger binding ability to Al 3＋ than the LB-EPS,and TB-EPS play an important role in the interaction with Al 3＋.

关键词： extracellular polymeric substances activated sludge aluminum ion three-dimensional excitation emission matrix fluorescence quenching Fourier transform infrared spectroscopy

Effects of Al^3+on pollutant removal and extracellular polymeric substances(EPS)under anaerobic,anoxic and oxic conditions

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Frontiers of Environmental Science & Engineering 2019年第6期13卷 69-79页

作者： Lanhe Zhang Jing Zheng Jingbo Guo Xiaohui Guan Suiyi Zhu Yanping Jia Jian Zhang Xiaoyu Zhang Haifeng Zhang School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Key Laboratory of Songliao Aquatic Environment Ministry of EducationJilin Jianzhu UniversityChangchun 130118China School of Civil and Architecture Engineering Northeast Electric Power UniversityJilin 132012China School of Environment Northeast Normal UniversityChangchun 130117China

aluminum ions produced by aluminum mining,electrolytic industry and aluminum-based coagulants can enter wastewater treatment plants and interact with activated *** can subsequently contribute to the removal of suspended solids and affect activated sludge flocculation,as well as nitrogen and phosphorus *** this study,the effects of Al^3+on pollutant removal,sludge flocculation and the composition and structure of extracellular polymeric substances(EPS)were investigated under anaerobic,anoxic and oxic *** demonstrated that the highest chemical oxygen demand(COD)and total nitrogen(TN)removal efficiencies were detected for an Al^3+concentration of 10 mg/*** addition,the maximal dehydrogenase activity and sludge flocculation were also observed at this level of Al^3+.The highest removal efficiency of total phosphorus(TP)was achieved at an Ar+concentration of30 mg/*** flocculability of sludge in the anoxic zone was consistently higher than that in the anaerobic and oxic *** addition of Al^3+promoted the secretion of ***-like fluorescence peaks were detected in each EPS layer in the absence of Al^3+.At the Al^3+concentration of 10 mg/L,fulvic acid and tryptophan fluorescence peaks began to appear while the majority of protein species and the highest microbial activity were also *** Al^3+concentrations(10 mg/L)weakened microbial *** Al^3+concentrations(>30 mg/L)also inhibited the release of phosphorus in the anaerobic zone by reacting with PO4^3-.

关键词： Extracellular polymeric substances Activated sludge aluminum ion A^2O Wastewater

Effects of red-yellow soil acidification on seed germination of Chinese pine

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Journal of Environmental Sciences 2002年第1期14卷 115-119页

作者： TangHS WangRS ResearchCenterforEco－Environmentalsciences ChineseAcademyofSciencesBeijing100085China.E－mail：tanghs@*** ResearchCenterforEco－Environmentalsciences ChineseAcademyofSciencesBeijing100085

Acid treatments significantly change the physical and chemical properties of red yellow soil by lowering its pH value and leaching out aluminum(Al) ions that are harmful to the growth of plants. The structure of soil will be damaged, resulting in higher viscosity, higher water retention rate and lower air permeability of the soil. The germination rate of Chinese pine( Pinus tabulacformic Carr. ) seeds sowed in soil treated with sulphuric acid(H 2SO 4) decreased compared to that for untreated soil. The direct cause was the large amount of Al ions leached out because of low pH values(≥3.5). The added acid decreased the soil aggregation and increased the number of micro aggregates(under 250 μm in diameter). Such changes increased the soil's viscosity, which tied the pine needles to the soil after the seeds had germinated and prevented the seedlings from fully developing.

关键词： aluminum ion germination of Chinese pine red yellow soil soil aggregates soil viscosity

A Highly Selective and Sensitive Fluorescent Chemosensor for Detection of Al^(3+) in Totally Aqueous Media

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Chinese Journal of Chemistry 2014年第5期32卷 429-433页

作者： Xiaobo Li Jiayi Chen Enju Wang School of Chemistry and Chemical Engineering Hainan Normal UniversityHaikouHainan 571158China

A fluorescent chemosensor(1)based on 2-hydroxy-1-naphthaldehyde Schiff-base was developed for the detec-tion of Al^(3+)in 100%aqueous *** addition of Al^(3+),a significant fluorescence enhancement was ob-served,which was not affected by other metal ions including Na^(+),K^(+),Ca^(2+),Mg^(2+),Mn^(2+),Co^(2+),Ni^(2+),Cu^(2+),Cr^(3+),Ag+,Pb^(2+),Zn^(2+),Cd^(2+),Hg^(2+),Fe^(2+)and Fe^(3+)under weak acid ***,the specific response to Al^(3+)was visible under natural *** binding mode between 1 and Al^(3+)was clarified by ESI-MS and 1H NMR.

关键词： fluorescence sensor aluminum ion 2-hydroxynapthaldehyde aqueous sensor

Potassium ion pre‑intercalated MnO_(2)for aqueous multivalent ion batteries

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Frontiers of Optoelectronics 2023年第4期16卷 81-89页

作者： Zikang Xu Ruiqi Ren Hang Ren Jingyuan Zhang Jinyao Yang Jiawen Qiu Yizhou Zhang Guoyin Zhu Liang Huang Shengyang Dong School of Environmental Science and Engineering School of Chemistry and Materials ScienceNanjing University of Information Science and TechnologyNanjing 210044China Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China

Manganese dioxide(MnO_(2)),as a cathode material for multivalent ion(such as Mg^(2+)and Al^(3+))storage,is investigated due to its high initial ***,during multivalent ion insertion/extraction,the crystal structure of MnO_(2)partially collapses,leading to fast capacity decay in few charge/discharge ***,through pre-intercalating potassium-ion(K+)intoδ-MnO_(2),we synthesize a potassium ion pre-intercalated MnO_(2),K_(0.21)MnO_(2)·0.31H_(2)O(KMO),as a reliable cathode material for multivalent ion *** as-prepared KMO exhibits a high reversible capacity of 185 mAh/g at 1 A/g,with considerable rate performance and improved cycling stability in 1 mol/L MgSO_(4)*** addition,we observe that aluminum-ion(Al^(3+))can also insert into a KMO *** work provides a valid method for modifcation of manganesebased oxides for aqueous multivalent ion batteries.

关键词： Aqueous batteries Multivalent ion batteries Magnesium ion aluminum ion MnO_(2)

Turn-on circularly polarized luminescence by amphiphilic Schiff bases

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Turn-on circularly polarized luminescence by amphiphilic Sch...

Novel Tetraphenylethylene-Based Hydrogen-Bonded Organic Frameworks(HOFs) for the selective recognition of Al3+

河南省化学会2018年学术年会

作者： Qingxian Jin Shuyu Chen Hejin Jiang Li Zhang Minghua Liu Henan Provincial Key Laboratory of Surface &Interface Science Zhengzhou University of Light Industry Beijing National Laboratory for Molecular Science CAS Key Laboratory of Colloid Interface and Chemical ThermodynamicsInstitute of ChemistryChinese Academy of Science

Amphiphilic naphthalene-substituted Schiff bases containing a glutamide moiety were designed and utilized to selectively sense aluminum *** various metal ions were added into the ethanol solution of the amphiphilic Schiff bases,most ions did not change the luminescence property,Mg,Znand Alshowed enhancement of the emission of Schiff *** for Al,amphiphilic Schiff base exhibited a significant fluorescence enhancement at465nm due to the inhibition of the photo induced electron transfer(PET)and excited-state intramolecular proton transfer(ESIPT).The 1:1 binding stoichiometry between amphiphilic Schiff bases and Alwas corroborated by the Job’s plot and the ESI-MS *** the Schiff bases contained a chiral center,the metal complexes of Mg,Znand Alexhibited induced supramolecular chirality,which was characterized by the obvious negative Cotton effect in Circular Dichroism(CD)***,only the Alion coordinated Schiff base showed Circularly Polarized Luminescence(CPL),implying Alselectively turn-on CPL of amphiphilic Schiff *** work presents a simple way to fabricate chiral system emitting CPL based on aluminum ion coordination.

关键词： Schiff bases Self-assembly Circularly polarized luminescence Chiral aluminum ion

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Novel Tetraphenylethylene-Based Hydrogen-Bonded Organic Fram...