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Zhang G.,Zhejiang University of Technology | Qin L.,Zhejiang University of Technology | Wang L.,Zhejiang University of Technology | Wang L.,Hangzhou Special Equipments Inspection Institute | Zhang J.,Zhejiang University of Technology
Recent Patents on Engineering | Year: 2012

More and more clean and safe drinking water will be needed due to the explosive population growth and water pollution, as well as people's increasing demands for better life quality. In response to this problem, various kinds of drinking water treatment approaches have been developed over the past decade. As a result, diversified water purifiers with patents appeared on the market. This paper analyzes recent researches and developments of advanced drinking water treatment, and seeks to offer a scientific and technical overview of dramatic trend and useful information to researchers who work in this field. Potential methods and popular apparatuses with patents are discussed first, especially those novel processes using membranes. Compared with ozonation, electrolysis and photocatalysis process, membrane technology shows enormous application potential and bright development prospect in the field of advanced drinking water treatment. The advantages of novel membrane processes include extremely high quality of water, nature friendly, cost effectiveness and easy operation. Therefore, commercial point-of-use water purifiers with membrane module are becoming more popular on the market. With a view to the membrane fouling in water purifiers, progresses on available filtration media prior to membrane separation are also discussed, such as copper/zinc redox alloy (KDF) and activated carbon fiber (ACF). These typical filtration medias have played a dual role in both alleviating membrane fouling and enhancing water quality. © 2012 Bentham Science Publishers. Source


Zhang J.,Zhejiang University of Technology | Wang L.,Zhejiang University of Technology | Wang L.,Hangzhou Special Equipments Inspection Institute | Yao L.,Zhejiang University of Technology | And 2 more authors.
Recent Patents on Chemical Engineering | Year: 2013

Water shortage in the world has stimulated the rapid development of water treatment technology. As one of the most promising technologies, membrane separation has tremendous hopes in producing fresh water and dealing with wastewater. The blend of inorganic component into polymer membrane has become an efficient way to increase the antifouling property and realize the multifunction of polymer membrane. In this paper, we summarize recent results published in patent and literatures for the preparation and applications of organic-inorganic hybrid membranes (OIHM) used in water treatment. Special attentions are paid on the selection of new nanoparticles, improvement of fabrication process, and discussion about the new function and application of OIHM in water treatment. The emphasis is providing some efficient methods of preparing OIHM with high antifouling property and multifunction, and extending their application ranges in future water treatment. © 2013 Bentham Science Publishers. Source


Zhang G.,Zhejiang University of Technology | Pan X.,Zhejiang University of Technology | Wang L.,Zhejiang University of Technology | Wang L.,Hangzhou Special Equipments Inspection Institute | And 3 more authors.
Recent Patents on Engineering | Year: 2013

TiO2 nanotubes have recently been studied extensively due to their high surface areas and finite length scales, allowing highly efficiency electron-hole charge separation and reduced recombination. Owing to these properties they can be used for instance in photocatalysis and lithium-ion batteries. The preparation of TiO2 nanotubes through hydrothermal process has received much attention. However, the practical application of TiO2 nanotubes is significantly hindered by their intrinsic energy band gap > 3 eV, which ensures that these materials cannot be excited by visible light. Visible-lightactivated TiO2 can be prepared by doping through incorporation or decoration with other metal ions, non-metal ions, and semiconductors. This review discusses various types of dopants, doping methods, and applications of doped TiO2 nanotubes. © 2013 Bentham Science Publishers. Source


Wang Z.,Zhejiang University of Technology | Wang L.,Zhejiang University of Technology | Wang L.,Hangzhou Special Equipments Inspection Institute | Yao L.,Zhejiang University of Technology | And 2 more authors.
Advanced Materials Research | Year: 2013

Membrane separation coupled with photocatalysis process, which is also called photocatalytic membrane reactor (PMR), is a new hybrid technology working for water supply and wastewater treatment. Due to some unique advantages, such as nontoxic and continuous running, this kind of novel coupling systems has developed rapidly in the past few years. In this work, the characteristic and structure of configurations, photocatalysts and membranes are analyzed briefly. © (2013) Trans Tech Publications, Switzerland. Source


Zhang G.,Zhejiang University of Technology | Yao L.,Zhejiang University of Technology | Wang L.,Zhejiang University of Technology | Wang L.,Hangzhou Special Equipments Inspection Institute | And 3 more authors.
Recent Patents on Engineering | Year: 2012

Photocatalytic membrane reactor (PMR), in which photocatalysis is coupled with membrane separation process, is a new hybrid technology for water and wastewater treatment. With some unique advantages such as nontoxic and continuous running, PMR has developed rapidly in the past few years. In this work, different kinds of PMRs are compared and related patents and research progresses are briefly summarized. Operation modes, module structures, variants of membranes and morphologies of photocatalysts are analyzed. Particularly, the configurations of PMRs with low pressure-driven membranes are discussed in detail due to its promising future in water purification. Further, some interesting PMR systems coupled with other membrane technology such as membrane distillation and dialysis are also introduced. © 2012 Bentham Science Publishers. Source

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