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https://www.readbyqxmd.com/read/28330267/treatment-of-landfill-leachate-using-asbr-combined-with-zeolite-adsorption-technology
#1
Chi Kim Lim, Ta Wee Seow, Chin Hong Neoh, Muhamad Hanif Md Nor, Zaharah Ibrahim, Ismail Ware, Siti Hajar Mat Sarip
Sanitary landfilling is the most common way to dispose solid urban waste; however, improper landfill management may pose serious environmental threats through discharge of high strength polluted wastewater also known as leachate. The treatment of landfill leachate to fully reduce the negative impact on the environment, is nowadays a challenge. In this study, an aerobic sequencing batch reactor (ASBR) was proposed for the treatment of locally obtained real landfill leachate with initial ammoniacal nitrogen and chemical oxygen demand (COD) concentration of 1800 and 3200 mg/L, respectively...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28327599/metal-organic-framework-templated-synthesis-of-ultrasmall-catalyst-loaded-zno-znco2o4-hollow-spheres-for-enhanced-gas-sensing-properties
#2
Won-Tae Koo, Seon-Jin Choi, Ji-Soo Jang, Il-Doo Kim
To achieve the rational design of nanostructures for superior gas sensors, the ultrasmall nanoparticles (NPs) loaded on ternary metal oxide (TMO) hollow spheres (HS) were synthesized by using the polystyrene (PS) sphere template and bimetallic metal-organic framework (BM-MOFs) mold. The zinc and cobalt based zeolite imidazole frameworks (BM-ZIFs) encapsulating ultrasmall Pd NPs (2-3 nm) were assembled on PS spheres at room temperature. After calcination at 450 °C, these nanoscale Pd particles were effectively infiltrated on the surface of ZnO/ZnCo2O4 HSs...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28319391/synthesis-isotopic-enrichment-and-solid-state-nmr-characterization-of-zeolites-derived-from-the-assembly-disassembly-organisation-reassembly-process
#3
Giulia P M Bignami, Daniel M Dawson, Valerie R Seymour, Paul S Wheatley, Russell Edward Morris, Sharon E Ashbrook
The great utility and importance of zeolites in fields as diverse as industrial catalysis and medicine has driven considerable interest in the ability to target new framework types with novel properties and applications. The recently-introduced and unconventional Assembly, Disassembly, Organization, Reassembly (ADOR) method represents one exciting new approach to obtain solids with targeted structures by selectively disassembling pre-prepared hydrolytically-unstable frameworks, and then reassembling the resulting products to form materials with new topologies...
March 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28314426/erratum-to-nanocrystals-of-zeolite-act-as-enhanced-sensing-interface-for-biosensing-of-leviteracetum
#4
(no author information available yet)
No abstract text is available yet for this article.
April 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28304412/catalysis-for-fuels-concluding-remarks
#5
P Gibson
The 2017 Faraday Discussion on the topic of "Catalysis for Fuels" was unique in the sense that it was the first Faraday Discussion to be held on the continent of Africa. "Catalysis" and "Fuels" are both topics that could be widely interpreted and the session topics proved to be a relevant spread of old and new i.e. Fischer-Tropsch chemistry, biomass refining, zeolite conversions and photocatalysis. Most of the papers were underpinned by fundamental studies, catalyst design approaches, reports of in operando characterization and detailed speciation and micro kinetic analyses...
March 17, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28301730/a-review-of-biorefinery-separations-for-bioproduct-production-via-thermocatalytic-processing
#6
Hannah Nguyen, Robert F DeJaco, Nitish Mittal, J Ilja Siepmann, Michael Tsapatsis, Mark A Snyder, Wei Fan, Basudeb Saha, Dionisios G Vlachos
With technological advancement of thermocatalytic processes for valorizing renewable biomass carbon, development of effective separation technologies for selective recovery of bioproducts from complex reaction media and their purification becomes essential. The high thermal sensitivity of biomass intermediates and their low volatility and high reactivity, along with the use of dilute solutions, make the bioproducts separations energy intensive and expensive. Novel separation techniques, including solvent extraction in biphasic systems and reactive adsorption using zeolite and carbon sorbents, membranes, and chromatography, have been developed...
March 15, 2017: Annual Review of Chemical and Biomolecular Engineering
https://www.readbyqxmd.com/read/28299934/antibacterial-composite-film-based-triboelectric-nanogenerator-for-harvesting-walking-energy
#7
Guangqin Gu, Changbao Han, Jingjing Tian, Cunxin Lu, Chuan He, Tao Jiang, Zhou Li, Zhong Lin Wang
As a green and eco-friendly technology, triboelectric nanogenerator (TENG) can harvest energy from human motion to generate electricity, so TENGs have been widely applied in wearable electronic devices to replace the traditional batteries. However, the surface of these TENGs is easy to be contaminated and breed bacteria, which is a threat to human health. Here, we report an antibacterial composite film-based triboelectric nanogenerator (ACF-TENG) that uses Ag exchanged zeolite (Ag-zeolite) and polypropylene (PP) composite film as the triboelectric layer...
March 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28298974/zeolite-silver-zinc-nanoparticles-biocompatibility-and-their-effect-on-the-compressive-strength-of-mineral-trioxide-aggregate
#8
Mohammad Samiei, Negin Ghasemi, Naser Asl-Aminabadi, Baharak Divband, Yasamin Golparvar-Dashti, Sajjad Shirazi
BACKGROUND: This study was carried out to evaluate the biocompatibility of zeolite-silver-zinc (Ze-Ag-Zn) nanoparticles and their effect on the compressive strength of Mineral Trioxide Aggregate (MTA). MATERIAL AND METHODS: Biocompatibility was evaluated by an MTT assay on the pulmonary adenocarcinoma cells with 0.05, 0.1, 0.25, 0.5, 1 and 5 mg/mL concentrations of Ze-Ag-Zn. For compressive strength test, four groups containing 15 stainless-steel cylinders with an internal diameter of 4 and a height of 6 mm were prepared and MTA (groups 1 and 2) or MTA + 2% Ze-Ag-Zn (groups 3 and 4) were placed in the cylinders...
March 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28297708/ultra-selective-high-flux-membranes-from-directly-synthesized-zeolite-nanosheets
#9
Mi Young Jeon, Donghun Kim, Prashant Kumar, Pyung Soo Lee, Neel Rangnekar, Peng Bai, Meera Shete, Bahman Elyassi, Han Seung Lee, Katabathini Narasimharao, Sulaiman Nasir Basahel, Shaeel Al-Thabaiti, Wenqian Xu, Hong Je Cho, Evgenii O Fetisov, Raghuram Thyagarajan, Robert F DeJaco, Wei Fan, K Andre Mkhoyan, J Ilja Siepmann, Michael Tsapatsis
A zeolite with structure type MFI is an aluminosilicate or silicate material that has a three-dimensionally connected pore network, which enables molecular recognition in the size range 0.5-0.6 nm. These micropore dimensions are relevant for many valuable chemical intermediates, and therefore MFI-type zeolites are widely used in the chemical industry as selective catalysts or adsorbents. As with all zeolites, strategies to tailor them for specific applications include controlling their crystal size and shape...
March 15, 2017: Nature
https://www.readbyqxmd.com/read/28295998/expansion-of-the-ador-strategy-for-the-synthesis-of-zeolites-the-synthesis-of-ipc-12-from-zeolite-uov
#10
Valeryia Kasneryk, Mariya Shamzhy, Maksym Opanasenko, Paul S Wheatley, Samuel A Morris, Samantha E Russell, Alvaro Mayoral, Michal Trachta, Jiří Čejka, Russell E Morris
The assembly-disassembly-organization-reassembly (ADOR) process has been used to disassemble a parent zeolite with the UOV structure type and then reassemble the resulting layers into a novel structure, IPC-12. The structure of the material has previously been predicted computationally and confirmed in our experiments using X-ray diffraction and atomic resolution STEM-HAADF electron microscopy. This is the first successful application of the ADOR process to a material with porous layers.
March 13, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28295317/applications-of-natural-zeolites-on-agriculture-and-food-production
#11
REVIEW
Nazife Eroglu, Mevlut Emekci, Christos Athanassiou
Zeolites are crystalline hydrated aluminosilicates with remarkable physical and chemical properties including losing and receiving water in a reverse way, adsorbing molecules that act as molecular sieves, and replacing their constituent cations without structural change. Commercial production of natural zeolites has accelerated during last fifty years. The Structure Commission of the International Zeolite Association recorded more than 200 zeolites which currently include more than 40 naturally occurring zeolites...
March 14, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28287605/two-way-valorization-of-blast-furnace-slag-synthesis-of-precipitated-calcium-carbonate-and-zeolitic-heavy-metal-adsorbent
#12
Evangelos Georgakopoulos, Rafael M Santos, Yi Wai Chiang, Vasilije Manovic
The aim of this work is to present a zero-waste process for storing CO2 in a stable and benign mineral form while producing zeolitic minerals with sufficient heavy metal adsorption capacity. To this end, blast furnace slag, a residue from iron-making, is utilized as the starting material. Calcium is selectively extracted from the slag by leaching with acetic acid (2 M CH3COOH) as the extraction agent. The filtered leachate is subsequently physico-chemically purified and then carbonated to form precipitated calcium carbonate (PCC) of high purity (<2 wt% non-calcium impurities, according to ICP-MS analysis)...
February 21, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28282097/screening-metal-organic-frameworks-for-separation-of-pentane-isomers
#13
Rajamani Krishna, Jasper M van Baten
This article compares the performances of several metal-organic frameworks (MOFs) and zeolitic imidazolate frameworks (ZIFs) for the separation of pentane isomers: n-pentane (nC5), 2-methylbutane (2MB), and 2,2-dimethylpropane (= neo-pentane (neo-P)) in fixed bed adsorbers. The required input data on unary and mixture adsorption equilibria are obtained from Configurational-Bias Monte Carlo (CBMC) simulations for twelve different adsorbents. The best separation performance is realized with Fe2(BDP)3, where BDP(2-) = 1,4-benzenedipyrazolate, a MOF with triangular shaped 4...
March 10, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28281743/mesoporous-metal-organic-framework-with-well-defined-cruciate-flower-like-morphology-for-enzyme-immobilization
#14
Jiandong Cui, Yuxiao Feng, Tao Lin, Zhilei Tan, Cheng Zhong, Shiru Jia
Metal-organic frameworks (MOFs) have recently emerged as a promising candidates for the immobilization of enzymes due to their diversified structures and porosity. However, a lack of good size and morphological control over the as-prepared MOFs has limited their practical applications in some cases. Herein, instead of zeolitic imidazolate framework-8 (ZIF-8) with the standard rhombic dodecahedral morphology, we successfully synthesize a novel mesoporous catalase@ZIF composite with cruciate flower-like morphology by embedding catalase molecules into uniformly sized ZIF crystals...
March 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28281635/aluminum-induced-dreierketten-chain-cross-links-increase-the-mechanical-properties-of-nanocrystalline-calcium-aluminosilicate-hydrate
#15
Guoqing Geng, Rupert J Myers, Jiaqi Li, Roya Maboudian, Carlo Carraro, David A Shapiro, Paulo J M Monteiro
The incorporation of Al and increased curing temperature promotes the crystallization and cross-linking of calcium (alumino)silicate hydrate (C-(A-)S-H), which is the primary binding phase in most contemporary concrete materials. However, the influence of Al-induced structural changes on the mechanical properties at atomistic scale is not well understood. Herein, synchrotron radiation-based high-pressure X-ray diffraction is used to quantify the influence of dreierketten chain cross-linking on the anisotropic mechanical behavior of C-(A-)S-H...
March 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28280816/boron-containing-mfi-type-zeolites-with-a-hierarchical-nanosheet-assembly-for-lipase-immobilization
#16
V R Reddy Marthala, Lynn Urmoneit, Zhou Zhou, Albert G F Machoke, Martin Schmiele, Tobias Unruh, Wilhelm Schwieger, Martin Hartmann
Hierarchical nanosheet assemblies of boron-containing MFI-type zeolites were successfully synthesized using bifunctional surfactant molecules under static conditions. With the optimized Si/B = 50 in the synthesis gel, a material with high specific surface area (483 m(2) g(-1)) and a maximum pore size of 6.5 nm suitable for lipase encapsulation was obtained.
March 10, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28279871/filtration-and-removal-performances-of-membrane-adsorbers
#17
Yilmaz Yurekli, Mehmet Yildirim, Levent Aydin, Melih Savran
Membrane adsorbers are promising candidates for the efficient and effective removal of heavy metals in waste water due to their unattainable adsorption and filtration capabilities. In the present study, zeolite nanoparticles incorporated polysulfone (PSf10) membrane was synthesized by means of non-solvent induced phase separation technique for the removal of lead and nickel ions in water. PSf10 showed a remarkable sorption capability and after repeated (adsorption/desorption)5 cycles in batch experiments, it preserved 77% and 92% of its initial sorption capacity for the lead and nickel, respectively...
March 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28277946/separation-of-bsa-through-fau-type-zeolite-ceramic-composite-membrane-formed-on-tubular-ceramic-support-optimization-of-process-parameters-by-hybrid-response-surface-methodology-and-bi-objective-genetic-algorithm
#18
R Vinoth Kumar, I Ganesh Moorthy, G Pugazhenthi
In this study, Faujasite (FAU) zeolite was coated on low cost tubular ceramic support as a separating layer via hydrothermal route. The mixture of silicate and aluminate solutions was used to create a zeolitic separation layer on the support. The prepared zeolite ceramic-composite membrane was characterized by using X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), particle size distribution (PSD), Field emission scanning electron microscopy (FESEM) and zeta potential measurements...
March 9, 2017: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/28277034/electron-paramagnetic-resonance-and-transmission-electron-microscopy-study-of-the-interactions-between-asbestiform-zeolite-fibers-and-model-membranes
#19
Michela Cangiotti, Michela Battistelli, Sara Salucci, Elisabetta Falcieri, Michele Mattioli, Matteo Giordani, Maria Francesca Ottaviani
Different asbestiform zeolite fibers of the erionite (termed GF1 and MD8, demonstrated carcinogenic) and offretite (termed BV12, suspected carcinogenic) families were investigated by analyzing the electron paramagnetic resonance (EPR) spectra of selected surfactant spin probes and transmission electron microscopy (TEM) images in the presence of model membranes-cetyltrimethylammonium (CTAB) micelles, egg-lecithin liposomes, and dimyristoylphosphatidylcholine (DMPC) liposomes. This was undertaken to obtain information on interactions occurring at a molecular level between fibers and membranes which correlate with entrance of fibers into the membrane model or location of the fibers at the external or internal membrane interfaces...
February 22, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28272798/acidic-zeolite-l-as-a-highly-efficient-catalyst-for-dehydration-of-fructose-to-5-hydroxymethylfurfural-in-ionic-liquid
#20
Zhongsen Ma, Hualei Hu, Zhongqiang Sun, Wenting Fang, Jian Zhang, Longfei Yang, Yajie Zhang, Lei Wang
Zeolite L was synthesized by the hydrothermal method and post-treated by NH4-exchange to adjust its acidity. The samples were systematic characterized by various techniques including XRD, XRF, N2 adsorption-desorption, SEM, Py-IR, and NH3-TPD. The results demonstrate that the NH4-exchange post-treatment increase the surface areas, micropore volume, and acidity of zeolite L. The catalytic performances of the samples were tested in the dehydration of fructose to 5-hydroxymethylfurfural (HMF) in ionic liquid (1-butyl-3-methylimidazolium bromide ([bmim]Br))...
March 8, 2017: ChemSusChem
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