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  1. Article ; Online: Self-consumed strategy to reuse cathode residue for Zn stabilization in spent batteries: Structural properties and metal stabilization effect.

    Ma, Shengshou / Liao, Chang-Zhong / Leung, Ka-Ming / Zhou, Ying / Shih, Kaimin

    Waste management (New York, N.Y.)

    2023  Volume 168, Page(s) 272–280

    Abstract: Due to ecotoxicity, zinc (Zn) as a heavy metal from electronic waste (e-waste) has been a source of pollution to soil and water for several decades. This study proposes a solution to this serious environmental problem via a self-consumed strategy to ... ...

    Abstract Due to ecotoxicity, zinc (Zn) as a heavy metal from electronic waste (e-waste) has been a source of pollution to soil and water for several decades. This study proposes a solution to this serious environmental problem via a self-consumed strategy to stabilize Zn in anode residues. This unique method uses cathode residues from spent zinc-manganese oxide (Zn-Mn) batteries as a stabilized matrix via thermal treatment. More specifically, the strategy incorporates zinc metal into a chemically durable matrix comprised of a lattice of AB
    MeSH term(s) Zinc/chemistry ; Metals, Heavy/chemistry ; Manganese ; Environmental Pollutants/analysis ; Environmental Pollutants/chemistry ; Acids ; Electrodes
    Chemical Substances Zinc (J41CSQ7QDS) ; Metals, Heavy ; Manganese (42Z2K6ZL8P) ; Environmental Pollutants ; Acids
    Language English
    Publishing date 2023-06-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2001471-5
    ISSN 1879-2456 ; 0956-053X
    ISSN (online) 1879-2456
    ISSN 0956-053X
    DOI 10.1016/j.wasman.2023.06.011
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  2. Article ; Online: Green conversion of waste alkaline battery material to zeolitic imidazolate framework-8 and its iodine capture mechanism.

    Ma, Shengshou / Leung, Ka-Ming / Liao, Changzhong / Chang, Chung-Kai / Zhou, Ying / Chen, Shangsi / Zhao, Xiaolong / Zhao, Qi / Shih, Kaimin

    Journal of hazardous materials

    2024  Volume 469, Page(s) 133612

    Abstract: Zeolitic imidazolate framework-8 (ZIF-8) exhibits excellent performance in capturing iodine. However, the solvent-based procedures and raw materials for ZIF-8 synthesis often lead to secondary pollution. We developed a solvent-minimizing method for ... ...

    Abstract Zeolitic imidazolate framework-8 (ZIF-8) exhibits excellent performance in capturing iodine. However, the solvent-based procedures and raw materials for ZIF-8 synthesis often lead to secondary pollution. We developed a solvent-minimizing method for preparing ZIF-8 via ball milling of raw material obtained from spent alkaline batteries, and studied its iodine-capture performance and structural changes. Exposure of the ZIF-8 to iodine vapor for 60 min demonstrated that it exhibited industrially competitive iodine-capture performance (the adsorbed amount reaches to 1123 mg g
    Language English
    Publishing date 2024-02-15
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2024.133612
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  3. Article ; Online: UiO66-Derived Catalyst for Low Temperature Catalytic Reduction of NO with NH

    Leung, Ka-Ming / Tsui, Chi-Kin J / Ho, Ching-Kit / Liao, Chang-Zhong / Yau, Hei-Tung / Chan, Kwong-Yu / Li, Chi-Ying V

    ACS omega

    2023  Volume 8, Issue 13, Page(s) 12362–12371

    Abstract: Diesel exhaust emissions are major outdoor air pollutants. Reducing the emission of NOx by diesel commercial vehicles and related machineries is at present a great challenge. In this study, we synthesize a catalyst for low-temperature catalytic reduction ...

    Abstract Diesel exhaust emissions are major outdoor air pollutants. Reducing the emission of NOx by diesel commercial vehicles and related machineries is at present a great challenge. In this study, we synthesize a catalyst for low-temperature catalytic reduction of NO using calcinated UiO-66(Zr) as a host for the doping of cerium, manganese, and titanium by the incipient wetness impregnation, followed by the dispersion of 1.0 wt % platinum. A solid solution of Ce
    Language English
    Publishing date 2023-03-24
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.2c07110
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  4. Article ; Online: Flexibility windows in faujasite with explicit water and methanol extra-framework content.

    Wells, Stephen A / Leung, Ka Ming / Edwards, Peter P / Sartbaeva, Asel

    Dalton transactions (Cambridge, England : 2003)

    2015  Volume 44, Issue 13, Page(s) 5978–5984

    Abstract: We present geometric simulations on a zeolite framework (faujasite) with extra-framework methanol and water contents explicitly present. We distinguish the intrinsic flexibility window of the framework from the newly defined extrinsic window limited by ... ...

    Abstract We present geometric simulations on a zeolite framework (faujasite) with extra-framework methanol and water contents explicitly present. We distinguish the intrinsic flexibility window of the framework from the newly defined extrinsic window limited by host-guest steric interactions. The extrinsic flexibility window can be limited not only in compression, but also in expansion, as the beta-cages in a maximally expanded framework lack the flexibility to adapt bulky contents such as a combination of methanol and water molecules. Our simulations suggest a reinterpretation of extra-framework content nominally refined as water sites in compression experiments.
    Language English
    Publishing date 2015-04-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/c4dt03150d
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  5. Article: Defining the flexibility window in ordered aluminosilicate zeolites.

    Wells, Stephen A / Leung, Ka Ming / Edwards, Peter P / Tucker, Matt G / Sartbaeva, Asel

    Royal Society open science

    2017  Volume 4, Issue 9, Page(s) 170757

    Abstract: The flexibility window in zeolites was originally identified using geometric simulation as a hypothetical property of ... ...

    Abstract The flexibility window in zeolites was originally identified using geometric simulation as a hypothetical property of SiO
    Language English
    Publishing date 2017-09-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 2787755-3
    ISSN 2054-5703
    ISSN 2054-5703
    DOI 10.1098/rsos.170757
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  6. Article: Microwave synthesis of LTN framework zeolite with no organic structure directing agents

    Leung, Ka Ming / Edwards, Peter P / Jones, Emyr / Sartbaeva, Asel

    RSC advances. 2015 Apr. 20, v. 5, no. 45

    2015  

    Abstract: We present a new microwave synthesis method of Linde Type N zeolite without organic structure directing agents (OSDAs). Linde Type N zeolite (framework type LTN) is one of the most complex zeolite structures with a very large unit cell. It has been ... ...

    Abstract We present a new microwave synthesis method of Linde Type N zeolite without organic structure directing agents (OSDAs). Linde Type N zeolite (framework type LTN) is one of the most complex zeolite structures with a very large unit cell. It has been synthesised previously using hydrothermal methods. We also report syntheses of zeolite A with LTA framework without OSDAs, by hydrothermal methods at low temperatures (40–60 °C). The as-synthesised zeolites were characterised using X-ray powder diffraction, solid state nuclear magnetic resonance, and scanning electron microscopy. LTA and LTN frameworks are obtained at lower synthesis temperatures, while sodalite (SOD framework) is produced at higher temperatures, confirming the crystallization of denser zeolites at higher temperatures.
    Keywords crystallization ; hot water treatment ; microwave treatment ; nuclear magnetic resonance spectroscopy ; scanning electron microscopy ; superoxide dismutase ; temperature ; X-ray diffraction ; zeolites
    Language English
    Dates of publication 2015-0420
    Size p. 35580-35585.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/c4ra16583g
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Intrinsic flexibility of porous materials; theory, modelling and the flexibility window of the EMT zeolite framework.

    Fletcher, Rachel E / Wells, Stephen A / Leung, Ka Ming / Edwards, Peter P / Sartbaeva, Asel

    Acta crystallographica Section B, Structural science, crystal engineering and materials

    2015  Volume 71, Issue Pt 6, Page(s) 641–647

    Abstract: Framework materials have structures containing strongly bonded polyhedral groups of atoms connected through their vertices. Typically the energy cost for variations of the inter-polyhedral geometry is much less than the cost of distortions of the ... ...

    Abstract Framework materials have structures containing strongly bonded polyhedral groups of atoms connected through their vertices. Typically the energy cost for variations of the inter-polyhedral geometry is much less than the cost of distortions of the polyhedra themselves - as in the case of silicates, where the geometry of the SiO4 tetrahedral group is much more strongly constrained than the Si-O-Si bridging angle. As a result, framework materials frequently display intrinsic flexibility, and their dynamic and static properties are strongly influenced by low-energy collective motions of the polyhedra. Insight into these motions can be obtained in reciprocal space through the `rigid unit mode' (RUM) model, and in real-space through template-based geometric simulations. We briefly review the framework flexibility phenomena in energy-relevant materials, including ionic conductors, perovskites and zeolites. In particular we examine the `flexibility window' phenomenon in zeolites and present novel results on the flexibility window of the EMT framework, which shed light on the role of structure-directing agents. Our key finding is that the crown ether, despite its steric bulk, does not limit the geometric flexibility of the framework.
    Language English
    Publishing date 2015-12-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 2020841-8
    ISSN 2052-5206 ; 1600-5740 ; 2052-5192 ; 0108-7681
    ISSN (online) 2052-5206 ; 1600-5740
    ISSN 2052-5192 ; 0108-7681
    DOI 10.1107/S2052520615018739
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  8. Book ; Online: New Counting Codes for Distributed Video Coding

    Lakus-Becker, Axel / Leung, Ka-Ming

    2007  

    Abstract: This paper introduces a new counting code. Its design was motivated by distributed video coding where, for decoding, error correction methods are applied to improve predictions. Those error corrections sometimes fail which results in decoded values worse ...

    Abstract This paper introduces a new counting code. Its design was motivated by distributed video coding where, for decoding, error correction methods are applied to improve predictions. Those error corrections sometimes fail which results in decoded values worse than the initial prediction. Our code exploits the fact that bit errors are relatively unlikely events: more than a few bit errors in a decoded pixel value are rare. With a carefully designed counting code combined with a prediction those bit errors can be corrected and sometimes the original pixel value recovered. The error correction improves significantly. Our new code not only maximizes the Hamming distance between adjacent (or "near 1") codewords but also between nearby (for example "near 2") codewords. This is why our code is significantly different from the well-known maximal counting sequences which have maximal average Hamming distance. Fortunately, the new counting code can be derived from Gray Codes for every code word length (i.e. bit depth).

    Comment: 10 pages, 4 tables
    Keywords Computer Science - Information Theory ; E.4 ; H.1.1
    Subject code 005
    Publishing date 2007-10-01
    Publishing country us
    Document type Book ; Online
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  9. Article ; Online: Intracranial aneurysms: midterm outcome of pipeline embolization device--a prospective study in 143 patients with 178 aneurysms.

    Yu, Simon Chun-Ho / Kwok, Ching-Kwong / Cheng, Pui-Wai / Chan, Kwong-Yau / Lau, Samuel Shun / Lui, Wai-Man / Leung, Ka-Ming / Lee, Raymand / Cheng, Harold Kin-Ming / Cheung, Yuk-Ling / Chan, Chi-Ming / Wong, George Kwok-Chu / Hui, Joyce Wai-Yi / Wong, Yiu-Chung / Tan, Chong-Boon / Poon, Wai-Lun / Pang, Kai-Yuen / Wong, Alain Kai-Sing / Fung, Kai-Hung

    Radiology

    2012  Volume 265, Issue 3, Page(s) 893–901

    Abstract: Purpose: To evaluate the midterm clinical and angiographic outcomes after pipeline embolization device (PED) placement for treatment of intracranial aneurysms.: Materials and methods: This prospective nonrandomized multicenter study was approved by ... ...

    Abstract Purpose: To evaluate the midterm clinical and angiographic outcomes after pipeline embolization device (PED) placement for treatment of intracranial aneurysms.
    Materials and methods: This prospective nonrandomized multicenter study was approved by the review boards of all involved centers; informed consent was obtained. Patients (143 patients, 178 aneurysms) with unruptured saccular or fusiform aneurysms or recurrent aneurysms after previous treatment were included and observed angiographically for up to 18 months and clinically for up to 3 years. Study endpoints included complete aneurysm occlusion; neurologic complications within 30 days and up to 3 years; clinical outcome of cranial nerve palsy after PED placement; angiographic evidence of occlusion or stenosis of parent artery and that of occlusion of covered side branches at 6, 12, and 18 months; and clinical and computed tomographic evidence of perforator infarction.
    Results: There were five (3.5%) cases of periprocedural death or major stroke (modified Rankin Scale [mRS] > 3) (95% confidence interval [CI]: 1.3%, 8.4%), including two posttreatment delayed ruptures, two intracerebral hemorrhages, and one thromboembolism. Five (3.5%) patients had minor neurologic complications within 30 days (mRS = 1) (95% CI: 1.3%, 8.4%), including transient ischemic attack (n = 2), small cerebral infarction (n = 2), and cranial nerve palsy (n = 1). Beyond 30 days, there was one fatal intracerebral hemorrhage and one transient ischemic attack. Ten of 13 patients (95% CI: 46%, 93.8%) completely recovered from symptoms of cranial nerve palsy within a median of 3.5 months. Angiographic results at 18 months revealed a complete aneurysm occlusion rate of 84% (49 of 58; 95% CI: 72.1%, 92.2%), with no cases of parent artery occlusion, parent artery stenosis (<50%) in three patients, and occlusion of a covered side branch in two cases (posterior communicating arteries). Perforator infarction did not occur.
    Conclusion: PED placement is a reasonably safe and effective treatment for intracranial aneurysms. The treatment is promising for aneurysms of unfavorable morphologic features, such as wide neck, large size, fusiform morphology, incorporation of side branches, and posttreatment recanalization, and should be considered a first choice for treating unruptured aneurysms and recurrent aneurysms after previous treatments.
    Supplemental material: http://radiology.rsna.org/lookup/suppl/doi:10.1148/radiol.12120422/-/DC1.
    MeSH term(s) Adult ; Aged ; Aged, 80 and over ; Angiography, Digital Subtraction ; Cerebral Angiography ; Chi-Square Distribution ; Embolization, Therapeutic/instrumentation ; Female ; Humans ; Intracranial Aneurysm/diagnostic imaging ; Intracranial Aneurysm/therapy ; Logistic Models ; Magnetic Resonance Angiography ; Male ; Middle Aged ; Postoperative Complications/diagnostic imaging ; Postoperative Complications/epidemiology ; Prospective Studies ; Tomography, X-Ray Computed ; Treatment Outcome
    Language English
    Publishing date 2012-12
    Publishing country United States
    Document type Journal Article ; Multicenter Study ; Research Support, Non-U.S. Gov't
    ZDB-ID 80324-8
    ISSN 1527-1315 ; 0033-8419
    ISSN (online) 1527-1315
    ISSN 0033-8419
    DOI 10.1148/radiol.12120422
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