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Yangying Zhao, Yanling Liu, Xiao-Mao Wang, Xia Huang, Yuefeng F Xie
Metal-organic frameworks (MOFs), a class of hybrid organic-inorganic materials, have recently attracted tremendous interests in the fabrication of thin-film nanocomposite (TFN) membranes with exceptional permselectivity. However, the structure-performance relationship of such membranes, which is a function of both MOF type and membrane fabrication procedure, has not been elucidated in the literature. In this study, three types of hydro-stable MOFs, namely MIL-53(Al), NH2-UiO-66 and ZIF-8, were used to fabricate TFN nanofiltration (NF) membranes via both blending (BL) and preloading (PL) interfacial polymerization (IP) methods...
March 15, 2019: ACS Applied Materials & Interfaces
Constanze Yue, Sebastian Teitz, Tomoyuki Miyabashi, Klaus Boller, Lia Laura Lewis-Ximenez, Sally A Baylis, Johannes Blümel
BACKGROUND: Chikungunya virus (CHIKV) and Mayaro virus (MAYV) are closely related members of the Semliki Forest complex within the genus alphavirus and are transmitted by arthropods, causing acute febrile illness in humans. CHIKV has spread to almost all continents, whereas autochthonous MAYV infections have been reported in South America and in the Caribbean. Nevertheless, there was concern about potential spread of MAYV to other regions similar to CHIKV in the past. The risk for transmission of emerging viruses by blood transfusion and the safety of plasma-derived medicinal products (PDMPs) are constant concerns...
March 7, 2019: Viruses
Shudi Mao, Ling Chen, Yi Zhang, Zhe Li, Zhuobiao Ni, Zhuo Sun, Ran Zhao
In this study, we demonstrated the influence of adding nanofiltration membranes to a CDI cell, when desalinating mono- and divalent salt solutions both theoretically and experimentally, and proposed a new procedure for the separation of mono- and divalent ions. It is revealed that the distinction of the diffusion coefficient between mono- and divalent ions is the key to the effective separation. Combined with the appropriate time of adsorption (1.5 h), the concentration ratio of NaCl to MgSO4 can be increased by a factor of 3, from a mixture with equal amount of NaCl and MgSO4 ...
February 28, 2019: Journal of Colloid and Interface Science
Rikard Tröger, Philipp Klöckner, Lutz Ahrens, Karin Wiberg
A multi-residue screening method for simultaneous measurement of a wide range of micropollutants in drinking water (DW) resources was developed. The method was applied in a field study in central Sweden on water from source to tap, including samples of surface water (upstream and downstream of a wastewater treatment plant, WWTP), intake water before and after a DW treatment plant (DWTP, pilot and full-scale), treated DW leaving the plant and tap water at end users. Low detection limits (low ng L-1 levels) were achieved by using large sample volumes (5 L) combined with ultra performance liquid chromatography high resolution mass spectrometry (UPLC-HRMS)...
June 15, 2018: Science of the Total Environment
Xiaofang Yang, Liao Meng, Fangang Meng
The dissolved organic matter (DOM) characterization in a full-scale landfill leachate treatment plant is of great importance for the design and operation of treatment processes. In this study, the long-term removal behaviors of DOM during landfill leachate treatment were explored using excitation emission matrix fluorescence spectroscopy (EEMs) coupled with parallel factor analysis (PARAFAC) and self-organizing map (SOM). Results indicated that the application of combining PARAFAC and SOM on EEMs analysis effectively characterized long-term removal behaviors of DOM during leachate treatment...
March 1, 2019: Science of the Total Environment
Emily L Marron, William A Mitch, Urs von Gunten, David L Sedlak
In response to water scarcity and an increased recognition of the risks associated with the presence of chemical contaminants, environmental engineers have developed advanced water treatment systems that are capable of converting municipal wastewater effluent into drinking water. This practice, which is referred to as potable water reuse, typically relies upon reverse osmosis (RO) treatment followed by exposure to ultraviolet (UV) light and addition of hydrogen peroxide (H2 O2 ). These two treatment processes individually are capable of controlling many of the chemical and microbial contaminants in wastewater; however, a few chemicals may still be present after treatment at concentrations that affect water quality...
March 1, 2019: Accounts of Chemical Research
Mohammad Peydayesh, Sreenath Bolisetty, Toraj Mohammadi, Raffaele Mezzenga
Amyloid-carbon hybrid membranes have exceptional performance in removing heavy metal ions from water, due to the presence of multiple binding sites on the amyloid fibrils, but the binding process is still not fully understood. In order to understand the mechanisms of amyloid-metal ion binding we perform adsorption isotherms on a model system given by β-lactoglobulin amyloid fibrils and four representative heavy metal ions: chromium (Cr), nickel (Ni), silver (Ag) and platinum (Pt). Furthermore, in order to get a comprehensive thermodynamic picture of the binding process between amino acid residues and heavy metals, we here use Isothermal Thermal Calorimetry (ITC) on native β-lactoglobulin monomers and amyloid fibrils exposed to the two model metal ions i...
February 27, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
Meng Li, Xi Wang, Cassandra J Porter, Wei Cheng, Xuan Zhang, Lianjun Wang, Menachem Elimelech
Forward osmosis (FO), an emerging membrane separation process, can potentially treat textile wastewaters with less fouling than pressure-driven membrane processes such as reverse osmosis and nanofiltration. However, conventional FO membranes with asymmetric architecture experience severe flux decline caused by internal concentration polarization and fouling as dye molecules accumulate on the membrane surface. In this study, we present a new strategy for concentrating dye by using a self-standing, support-free FO membrane with a symmetric structure...
February 25, 2019: Environmental Science & Technology
Muhammad Hanis Tajuddin, Norhaniza Yusof, Ihsan Wan Azelee, Wan Norharyati Wan Salleh, Ahmad Fauzi Ismail, Juhana Jaafar, Farhana Aziz, Kazukiyo Nagai, Nor Faizah Razali
This study aims to fabricate a thin film composite (TFC) membrane, modified with copper-aluminium layered double hydroxide (LDH) nanofillers via interfacial polymerization technique for nanofiltration (NF) processes. It was found that Cu-Al LDH nanofillers possessed layered structured materials with typical hexagonal plate-like shape and positive surface charge. The study revealed that TFN membrane exhibits a relatively smooth surface and a less nodular structure compared to pristine TFC membrane. The contact angle of TFN progressively decreased from 54...
2019: Frontiers in Chemistry
Meng Zhang, Qin Shi, Xiaozhe Song, Hui Wang, Zhaoyong Bian
Halogenated organics are widely used in modern industry, agriculture, and medicine, and their large-scale emissions have led to soil and water pollution. Electrochemical methods are attractive and promising techniques for wastewater treatment and have been developed for degradation of halogenated organic pollutants under mild conditions. Electrochemical techniques are classified according to main reaction pathways: (i) electrochemical reduction, in which cleavage of C-X (X = F, Cl, Br, I) bonds to release halide ions and produce non-halogenated and non-toxic organics and (ii) electrochemical oxidation, in which halogenated organics are degraded by electrogenerated oxidants...
February 23, 2019: Environmental Science and Pollution Research International
Varvara Sygouni, Alexis G Pantziaros, Iakovos C Iakovides, Evangelia Sfetsa, Polychronia I Bogdou, Emilia A Christoforou, Christakis A Paraskeva
The semi-solid wastes (pomace or alperujo) produced in the two-phase olive oil extraction process contains extremely high organic load and phenolic substances. Efficient treatment of such kinds of wastes using membrane filtration, should be sought to reduce the hazardous effects to the environment. On the other hand, phenolic compounds can be isolated and purified up to a level of commercial exploitation using the membrane technology. Firstly, the extraction process with mixtures of water and ethanol was optimized by testing extraction parameters (e...
February 5, 2019: Membranes
Hao Guo, Lu Elfa Peng, Zhikan Yao, Zhe Yang, Xiaohua Ma, Chuyang Y Tang
Polyamide-based thin film composite (TFC) membranes are generally optimized for salt rejection but not for the removal of trace organic contaminants (TrOCs). The insufficient rejection of TrOCs such as endocrine disrupting compounds (EDCs) by polyamide membranes can jeopardize product water safety in wastewater reclamation. In this study, we report a novel non-polyamide membrane chemistry using green tannic acid-iron (TA-Fe) complexes to remove TrOCs. The nanofiltration membrane formed at a TA-Fe molar ratio of 1:3 (TA-Fe3) had a continuous thin rejection layer of 10-30 nm in thickness, together with a water permeability of 5...
February 11, 2019: Environmental Science & Technology
Sang Hee Park, Yeo Jin Kim, Soon Jin Kwon, Min Gyu Shin, Seung Eun Nam, Young Hoon Cho, You In Park, Jeong F Kim, Jung-Hyun Lee
No abstract text is available yet for this article.
February 5, 2019: ACS Applied Materials & Interfaces
Jing Ren, Jianfeng Li, Jianguo Li, Zuliang Chen, Fangqin Cheng
Aromatic compounds are widely contained in coking wastewater (CWW), drawing great attention due to their potential risks to environment and human health. Integrated systems combining biological processes with advanced treatments are the current trend of CWW reclamation. However, the variations of aromatic composition throughout these processes are poorly understood. This study investigated the occurrence, fate and removal of aromatic compounds in a full scale CWW reclamation plant with eight treatment stages by gas chromatography-mass spectrometry and optical spectrum...
January 30, 2019: Chemosphere
Zhenhua Lü, Feng Hu, Haiyan Li, Xiru Zhang, Sanchuan Yu, Meihong Liu, Congjie Gao
The development of high performance membrane is crucial for enhanced separation efficiency of nanofiltration process in treating wastewaters from dye and textile industries. In this work, a novel thin-film composite nanofiltration membrane with an asymmetric separation layer composed of relatively compact skin and loose body was designed and fabricated for improved perm-selectivity and antifouling property. Nascent composite membrane with loose poly(piperazine amide) (PA) separation layer was interfacially synthesized and performed with secondary surface reaction using an aqueous tannic acid (TA) solution...
January 25, 2019: Journal of Hazardous Materials
Mattia Giagnorio, Francesco Ricceri, Alberto Tiraferri
This study evaluates a treatment system centered on forward osmosis (FO) to extract high-quality water from real brackish groundwater and wastewater. The groundwater had salinity of 4 g/L, while the wastewater sample consisted of a secondary effluent. These feed solutions were treated first in a FO step, achieving a recovery of >60%. Subsequently, the diluted draw solutions were subject to a nanofiltration (NF) step to regenerate their original osmotic pressure and to simultaneously collect a final permeate product...
January 22, 2019: Water Research
Hendrik J de Vries, Florian Beyer, Monika Jarzembowska, Joanna Lipińska, Paula van den Brink, Arie Zwijnenburg, Peer H A Timmers, Alfons J M Stams, Caroline M Plugge
Membrane filtration systems are widely applied for the production of clean drinking water. However, the accumulation of particles on synthetic membranes leads to fouling. Biological fouling (i.e., biofouling) of reverse osmosis and nanofiltration membranes is difficult to control by existing cleaning procedures. Improved strategies are therefore needed. The bacterial diversity on fouled membranes has been studied, especially to identify bacteria with specialized functions and to develop targeted approaches against these microbes...
2019: NPJ Biofilms and Microbiomes
Mahboubeh Kargar, Amir Lohrasebi
Understanding the behavior of water molecule transport through artificial nano-channels is essential in designing novel nanofluidic devices that could be used especially in nanofiltration processes. In this study, using nonequilibrium molecular dynamics (MD) simulations, we simulated the water flow through different graphene-based channels to investigate the influences of some key factors such as the channel thickness and applied pressure on the water flow. It was demonstrated that the water flow was enhanced by increasing the applied pressure and channel thickness...
January 28, 2019: Physical Chemistry Chemical Physics: PCCP
Yan Liu, George Q Chen, Xiuli Yang, Huining Deng
In recent decades, the advancements in layer-by-layer (LBL) assembly technology have provoked increasing interest in the preparation of multilayer polyelectrolyte membranes with excellent performance. In the current study, a novel nanofiltration (NF) membrane was prepared by pressure-driven layer-by-layer (LBL) assembly of polyethylenimine (PEI) and polyacrylicacid (PAA) on a porous substrate with chemical crosslinking. The effect of deposition pressure on separation performance of the prepared membranes was studied...
January 24, 2019: Membranes
Genghao Gong, Ping Wang, Zongyao Zhou, Yunxia Hu
A triple-layered TFC nanofiltration (NF) membrane consisting of a polyamide (PA) top layer covered on a polythersulfone microfiltration membrane with a carbon nanotube (CNT) interlayer was fabricated via interfacial polymerization. The structure and properties of PA active layer could be finely tailored by tuning the interfacial properties and pore structure of the CNT interlayer, including its surface pore size and thickness, and thus to improve its NF performance. This TFC NF membrane exhibited a high divalent salt rejection (the rejection of Na2SO4 and MgSO4 solution >98...
January 22, 2019: ACS Applied Materials & Interfaces
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