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The impact of uv treatment on microbial control and DBPs formation in full-scale drinking water systems in northern China

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Journal of Environmental Sciences 2020年第1期32卷 398-410页

作者： Xiuwei Ao Zhongyun Chen Simiao Li Chen Li Zedong Lu Wenjun Sun School of Environment Tsinghua University

To manage potential microbial risks and meet increasingly strict drinking water health standards,uv treatment has attracted increasing attention for use in drinking water systems in ***,the effects of uv treatment on microbial control and disinfection byproducts(DBPs)formation in real municipal drinking water systems are poorly ***,we collected water samples from three real drinking water systems in Beijing and Tianjin to investigate the impacts of uv treatment on microbial control and DBP *** employed heterotrophic plate count(HPC),flow cytometry(FCM),quantitative PCR analysis,and high-throughput sequencing to measure microorganisms in the *** trends were observed between HPC and total cell count(measured by FCM),indicating that a single indicator could not reflect the real degree of biological re-growth in drinking water distribution systems(DWDSs).A significant increase in the 16S rRNA gene concentration was observed when the uv system was ***,the bacterial community composition was similar at the phylum level but differed markedly at the genera level among the three *** chlorine-resistant bacteria,including potential pathogens(e.g.,Acinetobacter)showed a high relative abundance when the uv system was turned *** can be concluded that uv treatment can mitigate microbial re-growth to some ***,uv treatment had a limited influence on the formation of DBPs,including trihalomethanes,haloacetic acids,and nitrogenated *** findings of this study may help to understand the performance of uv treatment in real drinking water systems.

关键词： uv treatment Bacterial community Disinfection by-products(DBPs) Multi-barrier disinfection Municipal drinking water systems

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Surface characterization of polyimide and polyethylene terephthalate membranes toward plasma and uv treatments

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Progress in Natural Science:Materials International 2022年第3期32卷 314-327页

作者： Thi Sinh Vo Tran Thi Bich Chau Vo School of Mechanical Engineering Sungkyunkwan University Department of Industrial Management Can Tho University

This study is to bring an overview on various methods regarding the surface treatment performed on different polymeric membranes in relation to a deference between the treatment mechanism and their chemical ***, plasma and uv surface treatments(PST and UST) were utilized to treat the surfaces of two commercial membranes, i.e., aromatic polyimide and polyethylene terephthalate for various durations using a discharge electrode and an uv LED curing system, respectively. Based on the effects of PST and UST processes on the surface of these membranes, their surface properties have been characterized to surface morphology and hydrophilicity(or wettability), at same time the changes have probably occurred on their surface during the PST and UST processes. As a result, their hydrophilic behavior was significantly enhanced after conducting these treatment processes based on the investigation of water contact angle. Moreover, Fourier-transform infrared and Raman spectroscopy manifested the changes in the chemical bonds, interactions and orientations of molecules, which confirmed the apparition and insertion of polar functional groups after the surface treatments, and accordingly,their wettability was enhanced significantly. Also, optical microscopy images showed direct impactions on their surface and the evidence of slight surface aging/damage during the treatment processes based on the presentation of the strange streaks on the treated surfaces. In particular, the peel forces exhibited an increase comparing to the initial membranes, which is characteristically for enhancing their adhesion behavior. Hence, these results are needful for improving the surface properties of a material, and obtaining better adhesion behavior on the membrane-like materials and recycling polymer materials.

关键词： Plasma treatment uv treatment Polymeric membrane Aromatic polyimide Polyethylene terephthalate

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Promoting Bone Mesenchymal Stem Cells and Inhibiting Bacterial Adhesion of Acid-Etched Nanostructured Titanium by Ultraviolet Functionalization

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Journal of Materials Science & Technology 2015年第2期31卷 182-190页

作者： Guobo Lan Mei Li Ying Tan Lihua Li Xiaoming Yang Limin Ma Qingshui Yin Hong Xia Yu Zhang Guoxin Tan Chengyun Ning Southern Medical University Hospital of Orthopedics General Hospital of Guangzhou Military Command Faculty of Light and Chemical Guangdong University of Technology College of Materials Science and Technology South China University of Technology

Titanium(Ti) and its alloys are used extensively in orthopedic implants because of their excellent biocompatibility,mechanical properties and corrosion resistance. However,titanium-based implant materials face many severe complications,such as implant loosening due to poor osseointegration and bacterial infections,which may lead to implant failure. Hence,preparing a biomaterial surface,which enhances the interactions with host cells and inhibits bacterial adhesion,may be an optimal strategy to reduce the incidence of implant failure. This study aims to improve osseointegration and confer antibacterial properties on Ti through a combination of two surface modifications including nanostructuring generated by acid etching and ultraviolet(uv) light *** results showed that without uv treatment,the acid etching treatment of Ti surface was effective at both improving the adhesion of bone mesenchymal stem cells(BMSCs) and increasing bacterial adhesion. A further uv treatment of the acid-etched surface however,not only significantly improved the cell adhesion but also inhibited bacterial adhesion. The acid-etched nanostructured titanium with uv treatment also showed a significant enhancement on cell proliferation,alkaline phosphatase(ALP) activity and mineralization. These results suggest that such nanostructured materials with uv treatment can be expected to have a good potential in orthopedic applications.

关键词： uv treatment Nanostructures Bone mesenchymal stem

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Structural and Electrical Properties of the Low-k SiOC（-H） Film Prepared with Plasma-Enhanced Atomic Layer Deposition

Structural and Electrical Properties of the Low-k SiOC（-H）...

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第三届微电子及等离子体技术国际会议

作者： Chang Young Kim R.Navamathavan Chi Kyu Choi Nano Thin Film Materials Laboratory Department of PhysicsCheju National University Semiconductor Materials Process Laboratory School of Advanced Materials EngineeringChonbuk National University

SiOC（-H） thin films with low-dielectric-constant have been prepared by using plasma-enhanced atomic layer deposition.I-V and C-V characteristics of the SiOC（-H） films were measured for the meatal-insulator-semiconductor structure,Al/SiOC（-H）/p-Si（100）,in order to study the *** bonding characteristics and the chemical groups present in the SiOC（-H） films were investigated by using Fourier-transform infrared（FTIR） spectroscopy in the absorbance mode and X-ray photoelectron spectroscopy（XPS）.The film was shown to contain clearly distinguishable bonds of Si-O-Si and *** presence of Si-O and SiCH3 bonding in the SiOC（-H） film affects the Si-O-Si to Si-O-C（-H） can be suitably modified by closing the proper the uv treatment *** results demonstrated that the too high uv irradiation treatment（180 s） resulted in a oxygen rich SiOC（-H） ***,we believe that by adjusting the uv dose,we can minimize the defects and reduce the dielectric constant *** fixed charge density of as-deposited sample is 9.8×1011 cm-2,but the fixed charge density of the annealing samples increased from 1.5×1010 cm?2 to 1.5×1012 cm?2 for the Al/SiOC（-H）/p-Si（100）/Al structures with increasing annealing time and according to uv treatment time *** current density and breakdown field strength were slightly decreased with increasing uv irradiation treatment *** SiOC（-H） film deposited after post treated for 180 s uv irradiation showed the lowest dielectric constant of 2.65.

关键词： Low-k materials SiOC(-H) films PEALD uv treatment FTIR

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