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Wang X.,University of Jinan | Wang X.,Shandong Prov Engin Technology Res Centerfor Ecological Carbon Sink And Capture Utilization | Lu X.,University of Jinan | Xu W.,University of Jinan | And 4 more authors.
Key Engineering Materials | Year: 2014

The 2-thiol benzothiazole was blended in Polyvinylidene fluoride (PVDF) membrane to prepare a kind of PVDF modified ultrafiltration membrane that could be used to remove mercury ion in water treatment. The water flux and retention rate of BSA of obtained PVDF modified ultrafiltration membrane was 222 L/m2·h and 92.33% respectively. The membrane performance were characterized by infrared spectroscopy (FT-IR) and water contact angle measurement. The results showed that, the PVDF modified membrane presented better adsorption ability for mercury ion than the traditional PVDF membrane. After 4 phases of adsorption/desorption, the modified membrane maintained a mercury ion adsorption amount of 0.264 mg/cm2 and the desorption rate could reached 94%. ©2014 Trans Tech Publications Ltd, Switzerland. Source


Wang L.,University of Jinan | Zhang X.,University of Jinan | Guo S.,University of Jinan | Wang A.,Shandong Zhaojin Motian Co. | And 2 more authors.
Key Engineering Materials | Year: 2011

Hydrophilic Polyvinylidene fluoride (PVDF) flat ultrafiltration membranes were prepared by wet-spinning method. The influence of blending ratio ( the mass ratio of PVDF and PAA), polymer concentration on preparation of blending modified hydrophilic PVDF ultrafiltration membranes were investigated, the technical parameters of preparation of hydrophilic PVDF membranes were determined, and hydrophilic PVDF membranes were prepared. Then, hydrophilic PVDF membranes were characterized in terms of IR spectra, contact angle, scanning electron microscopy images, pure water flux and rejection. The results showed that hydrophilic ultrafiltration membrane could be prepared with PAA and PVDF blends, the hydrophilicity improved greatly, and it was better than traditional PVDF membrane. © (2011) Trans Tech Publications, Switzerland. Source


Wang L.,University of Jinan | Wang X.,University of Jinan | Wang A.,Shandong Zhaojin Motian Co. | Liu W.,University of Jinan | And 2 more authors.
Key Engineering Materials | Year: 2011

Hydrophilic Polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membranes were prepared by wet-spinning method. The effects of technical parameters of acrylic acid grafted onto PVDF on the performance of hydrophilic PVDF membranes were investigated via orthogonal test, the technical parameters of preparation of hydrophilic PVDF membranes were determined, and hydrophilic PVDF membranes were prepared. Then hydrophilic PVDF membranes were characterized in terms of breaking strength, breaking elongation, rupture pressure, pure water flux and rejection. The fouling properties and the conditions of acrylic acid grafted onto PVDF were also examined. The results showed that acrylic acid had been grafted onto PVDF, the breaking strength and rupture pressure improved greatly, and the fouling properties were better than PS hollow fiber UF membrane. © (2011) Trans Tech Publications, Switzerland. Source


Wang J.,Ocean University of China | Gao X.,Ocean University of China | Xu Y.,Ocean University of China | Wang Q.,Ocean University of China | And 3 more authors.
Desalination | Year: 2016

This work studied the feasibility of ultrasonic-assisted (US-assisted) chemical cleaning of nanofiltration (NF) membranes that fouled with inorganic scales. We carried out US-assisted acid cleaning experiments by filter arsenic-rich brackish water to investigate the influencing conditions of US-assisted cleaning technology. We first optimized the proper ultrasonic power intensity (1W/cm2) in avoiding of membrane damage. US-assisted water flushing can recover the membrane water flux by around 75%, which suggested that the removal of inorganic scales was inadequate. However, US-assisted acid cleaning is efficient for removing the inorganic scales on membrane surface, and cleaning time was significantly shortened by 1/3 to 2/3 when compared with acid cleaning. It is worth to note that US-assisted acid cleaning can be carried out at a lower pH value of 3.0, while traditional acid cleaning usually conducted at pH of 2.0.This would reduce disposal amount of chemical contaminants by up to 90%. Additionally, our investigation suggests the optimal temperature for US-assisted acid cleaning was around 30°C. This study revealed that the US-assisted acid cleaning method is an effective and environmental-friendly method for NF membrane cleaning. © 2015 Elsevier B.V. Source


Zheng Y.,Key Laboratory of Marine Chemistry Theory and Technology | Zheng Y.,Ocean University of China | Li Z.,State Oceanic Administration | Wang X.,Shandong Zhaojin Motian Co. | And 4 more authors.
Electrochimica Acta | Year: 2015

In this paper, a novel approach of five-compartment electrodialysis was proposed for the treatment of cyanide from gold mine effluent. Two different processing modes were introduced. In mode 1, the cyanide was removed with homogeneous ion exchange membranes and heterogeneous ion exchange membranes respectively. In mode 2, the recovery of cyanide was achieved with homogeneous monovalent anion exchange membranes (1-AEMs) and cation exchange membranes (CEMs). The applied voltage was optimized to improve the removal and recovery efficiency. In addition, pH variation (the recovery of alkaline solution) was investigated. The results showed that the CN- extraction percent of 87.14% was achieved at 30 V applied voltage with the energy consumption of 8.33 kWhm-3 in mode 2. Meanwhile, the removal rate reached up to 97.90% with homogeneous ion exchange membranes at 38 V applied voltage in mode 1, which was much higher than the case of heterogeneous ion exchange membranes (74.02%). Finally, the recovery of alkaline solution was achieved as above and the recovered alkaline solution could be reused for pH adjustment in ED process. This research provides a new insight into the resource recycling of cyanide from gold mine effluent in industrial application. © 2015 Published by Elsevier Ltd. Source

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