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Zhang, Ming,Zhao, Cheng,Li, Jinye,Xu, Liheng,Wei, Fang,Hou, Deyi,Sarkar, Binoy,Ok, Yong Sik Elsevier 2019 Journal of hazardous materials Vol.373 No.-
<P><B>Abstract</B></P> <P>Disposal of soil washing effluent (SWE) resulting from the surfactant-enhanced remediation of soil containing hydrophobic organic contaminants (HOCs)is complicated because of the presence of high levels of surfactants. The synthesized layered double hydroxides (LDHs), modified with sodium dodecyl sulfonate (SDS) in different loading amounts (organo-LDHs),were evaluated in this study as sorbents for the removal of two typical HOCs, phenanthrene (PHE) and pyrene (PYR),from a simulative SWE. The results showed that the organo-LDHs can effectively sorb PHE and PYR from the SWE within an equilibrium time of 2 h. All isotherms were linear and the sorption capabilities of the organo-LDHs increased almost linearly with the increase in the amount of SDS loaded on the LDHs. Besides, the surface areas of the organo-LDHs decreased sharply with the increase in SDS loading owing to the hindrance of the exposed surface of the LDHs by the incorporated SDS. These findings indicated that partitioning dominated the sorption process rather than adsorption, and the strong affinity of HOCs towards the organic phase in LDHs assisted in the effective removal of polycyclic aromatic hydrocarbons (PAHs) from the SWE. Furthermore, the sorption capabilities of organo-LDHs towards PHE and PYR at the higher loading amounts of SDS were much greater than that of commercial activated carbon at the higher concentration ranges of PAHs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dodecyl sulfonate anion modified LDHs are employed for the removal of PHE and PYR in soil washing effluent (SWE). </LI> <LI> Organo-LDHs showed superior performance in PHE removal from SWE than that of commercial activated carbon. </LI> <LI> Partitioning of PHE and PYR in the organic fraction of the organo-LDHs was the main mechanism. </LI> <LI> Using organo-LDHs for the separation of HOCs from surfactants in SWE facilitated reuse of the surfactants. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lei Li,You Feng,Jinye Li,Qing Li,Ting Liu,Qingfeng Chen 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.6
The floating island system exploits the combination of aquatic plants, microorganisms, and extracellular enzymes to purify wastewater. We investigated the purification efficiency of eight aquatic plant species cultured in wastewater. The relationships of plant purification capacity with extracellular enzyme activity and microbial community were analyzed to explore the crucial factors that affect the plant purification capacity and the mechanism of pollutants removal in different plant systems. Three plant species, namely Oenanthe javanica, Thalia dealbata, and lris pseudacorus, were most effective for purification of ammonium-nitrogen (NH₄<SUP>+</SUP>-N), total phosphate (TP), and chemical oxygen demand (COD) with maximum efficiencies of 76.09, 85.87, and 89.10%, respectively. Urease, alkaline phosphatase (AP), and β-glucosidase activities were significantly and positively correlated with root system development (P < 0.05). Activities of urease and AP were positively correlated with NH₄<SUP>+</SUP>-N and TP removal, respectively. The magnitude of urease and AP activity was generally consistent with the plant’s capacity to remove NH₄<SUP>+</SUP>-N and TP. β-Glucosidase activity and COD removal were not significantly correlated. The dominant microbial phylum in each species treatment was Proteobacteria. Alphaproteobacteria and Bacteroidia showed > 1% relative abundance and greater involvement in degradation of pollutants in the experimental system.
Jialiang Li,Fei Chen,Jinye Niu,Ying Yang,Zhihao Wang 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
In this study, α-Si3N4 ceramics were successfully prepared using MgO and AlPO4 as the sintering additives and a low temperature spark plasma sintering (SPS) technique. The resultant α-Si3N4 ceramics sintered from 1300 oC to 1500 oC show a fine microstructure with nearly no grain growth and phase transformation. The dielectric properties of the sintered ceramics are investigated in detail. α-Si3N4 ceramics with a porosity of 5-36% show a dielectric constant of 4.5-7.4 and a dielectric loss of less than 10 × 10−3. The existence of AlPO4 performing as a binder not only contributes to the low temperature sintering of fully-dense α-Si3N4 ceramics, but also reduces the dielectric constant and loss.