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Polytitanium sulfate(PTS):Coagulation application and Ti species detection

Journal of Environmental Sciences 2017年第2期29卷 250-258页

作者： Yanxia Zhao Sherub Phuntsho Baoyu Gao hokyong shon Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityJinan 250100China Centre for Technology in Water and Wastewater School of Civil and Environmental EngineeringUniversity of TechnologySydneyBroadwayNSW 2007Australia Key Laboratory for Special Functional Aggregated Materials of Education Ministry School of Chemistry and Chemical EngineeringShanclong UniversityJinan 250100China

Interest in the development of inorganic polymerized coagulants is growing; however, there are only limited studies on the synthesis of polytitanium coagulants, which are expected to exhibit improved coagulation efficiency with better floc properties. This study presents the synthesis of polytitanium sulfate（PTS） for potential application in water purification,followed by characterization of PTS flocs and titanium species detection. Stable PTS solutions were successfully synthesized and standard jar tests were conducted to evaluate their coagulation efficiency. Electrospray ionization time-of-flight mass spectrometry（ESI-TOF-MS） speciation analysis revealed that a variety of mononuclear and polynuclear complexes were formed in PTS solution, indicating the polymeric nature of the synthesized coagulant. Floc characteristics were studied through on-line monitoring of floc size using a laser diffraction particle size analyzer. Results showed that PTS had a comparable or in some cases even higher organic matter and particulate removal efficiency than Ti（SO4）*** effluent p H after PTS coagulation significantly improved toward desirable values closer to neutral p H. Properties of flocs formed by PTS were significantly improved in terms of floc size, growth rate and structure. This study showed that PTS could be an efficient and promising coagulant for water purification, with the additional benefit that its coagulated sludge can be used to recover valuable TiO2 nanoparticles for various commercial applications.

关键词： Polytitanium sulfate Coagulation and flocculation Titanium species Floc properties

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The interaction mechanisms of co-existing polybrominated diphenyl ethers and engineered nanoparticles in environmental waters: A critical review

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Journal of Environmental Sciences 2023年第2期124卷 227-252页

作者： Anwar Ul Haq Khan Ravi Naidu Raja Dharmarajan Cheng Fang hokyong shon Zhaomin Dong Yanju Liu Global Centre for Environmental Remediation(GCER) College of Engineering Science and EnvironmentThe University of NewcastleCallaghanNSW 2308Australia Cooperative Research Centre for Contamination Assessment and Remediation of the Environment(CRC CARE) ATC BuildingThe University of NewcastleCallaghanNSW 2308Australia School of Civil and Environmental Engineering University of Technology Sydney(UTS)City CampusBroadwayNSW 2007Australia School of Space and Environment Beihang UniversityBeijging 100191China

This review focuses on the occurrence and interactions of engineered nanoparticles(ENPs)and brominated flame retardants(BFRs)such as polybrominated diphenyl ethers(PBDEs)in water systems and the generation of highly complex compounds in the *** release of ENPs and BFRs(***)to aquatic environments during their usage and disposal are summarised together with their key interaction *** major interaction mechanisms including electrostatic,van derWaals,hydrophobic,molecular bridging and steric,hydrogen andπ-bonding,cation bridging and ligand exchange were *** presence of ENPs could influence the fate and behaviour of PBDEs through the interactions as well as induced reactions under certain conditions which increases the formation of complex *** interaction leads to alteration of behaviour for PBDEs and their toxic effects to ecological *** intermingled compound(ENPs-BFRs)would show different behaviour from the parental ENPs or BFRs,which are currently lack of *** review provided insights on the interactions of ENPs and BFRs in artificial,environmental water systems and wastewater treatment plants(WWTPs),which are important for a comprehensive risk assessment.

关键词： Engineered nanoparticles(ENPs) Polybrominated diphenyl ethers (PBDEs) Wastewater treatment plants (WWTPs) Emerging contaminants(ECs) Interaction mechanisms

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