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Photocatalytic degradation of organic pollutants using green oil palm frond-derived carbon quantum dots/titanium dioxide as multifunctional photocatalysts under visible light radiation

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Chinese Journal of Chemical Engineering 2022年第11期51卷 21-34页

作者： Zeng Wei Heng woon chan chong Yean Ling Pang Lan Ching Sim Chai Hoon Koo Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul RahmanSungai Long CampusJalan Sungai LongCheras43000 KajangSelangorMalaysia Centre for Photonics and Advanced Materials Research Universiti Tunku Abdul RahmanSungai Long CampusJalan Sungai LongCheras43000 KajangSelangorMalaysia

The present work suggested the use of waste oil palm frond as an alternative precursor for nitrogendoped carbon quantum dots(NCQDs)and proposed a straightforward in-situ hydrothermal method for the preparation of NCQDs/TiO_(2)*** elemental composition,morphological,structural and optical characteristics of NCQDs/TiO_(2)nanocomposites have been comprehensively *** successful grafting of NCQDs on TiO_(2)matrix was confirmed by the formation of Ti AOAC bond and the electronic coupling between theπ-states of NCQDs and the conduction band of TiO_(2).For the first time,the oil palm frond-derived NCQDs/TiO_(2)was adopted in the photodegradation of methylene blue(MB)under visible-light *** a result,the photocatalytic efficiency of NCQDs/TiO_(2)nanocomposites(86.16%)was 2.85 times higher than its counterpart TiO_(2)(30.18%).The enhanced performance of nanocomposites was attributed to the pivotal roles of NCQDs serving as electron mediator and visiblelight ***,the optimal NCQDs loading was determined at 4 ml while the removal efficiency of NCQDs/TiO_(2)-4 was the highest at a catalyst dosage of 1 g.L^(-1)under alkaline *** research work is important as it proposed a new insight to the preparation of biomass-based NCQDs/TiO_(2)using a facile synthetic method,which offers a green and sustainable water remediation technology.

关键词： Oil palm frond biomass N-doped carbon quantum dots Titanium-dioxide In-situ hydrothermal Visible light photocatalysis Methylene blue

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Nanohybrid membrane in algal-membrane photoreactor: Microalgae cultivation and wastewater polishing

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2799-2806页

作者： woon chan chong Abdul Wahab Mohammad Ebrahim Mahmoudi Ying Tao Chung Kamrul Fakir Kamarudin Mohd Sobri Takriff Chemical Engineering Programme Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Department of Chemical Engineering Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul RahmanJalan Sungai LongBandar Sungai LongCheras43000 KajangSelangorMalaysia Research Center for Sustainable Process Technology(CESPRO) Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Department of Chemical Engineering and Petroleum Engineering Faculty of EngineeringTechnology and Built EnvironmentUCSI UniversityNo.1Jalan Menara GadingUCSI HeightsCheras56000 Kuala LumpurMalaysia

Microalgae cultivation has gained tremendous attention in recent years due to its great potential in green biofuel production and wastewater treatment application. Membrane technology is a great solution in separating the microalgae biomass while producing high quality of permeate for recycling. The main objective of this study was to investigate the filtration performance of Ag/GO-PVDF(silver/graphene oxide-polyvinylidene fluoride) membrane in an algalmembrane photoreactor(A-MPR) by benchmarking with a commercial PVDF(com-PVDF) membrane. In this study, Chlorella vulgaris microalgae was cultivated in synthetic wastewater in an A-MPR for ammoniacal-nitrogen and phosphorus recovery and the wastewater was further filtered using Ag/GO-PVDF and com-PVDF membranes to obtain high quality water. Spectrophotometer was used to analyze the chemical oxidation demand(COD), ammoniacal nitrogen(NH3-N) and phosphate(PO43-). The concentration of proteins and carbohydrates was measured using Bradford method and phenol-sulfuric acid method, respectively. The COD of the synthetic wastewater was reduced from(180.5 ± 5.6) ppm to(82 ± 2.6) ppm due to nutrient uptake by microalgae. Then, the Ag/GO-PVDF membrane was used to further purify the microalgae cultivated wastewater, resulting in a low COD permeate of(31 ± 4.6) ppm. The high removal rate of proteins(100%) and carbohydrates(86.6%) as the major foulant in microalgae filtration, with low membrane fouling propensity of Ag/GO-PVDF membrane is advantageous for the sustainable development of the microalgae production. Hence, the integrated A-MPR system is highly recommended as a promising approach for microalgae cultivation and wastewater polishing treatment.

关键词： Algal-membrane photoreactor Nanohybrid membrane Wastewater polishing Microalgal cultivation Nutrient recovery

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马来西亚中学华文“名句精华”教学发展与现状

马来西亚中学华文“名句精华”教学发展与现状

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作者： chong YOKE woon（钟玉雯）浙江大学

学位级别：硕士

马来西亚的华文教育已有200年的历史,是中国两岸三地以外,最完整的华文教育体系的国家。马来西亚的华文教育,在课程内容上,有着不少传承中华文化、学习中国文学的内容。其中,要数中学华文课中"名句精华"的部分。"名句精华"是马来西亚教... 详细信息

马来西亚的华文教育已有200年的历史,是中国两岸三地以外,最完整的华文教育体系的国家。马来西亚的华文教育,在课程内容上,有着不少传承中华文化、学习中国文学的内容。其中,要数中学华文课中"名句精华"的部分。"名句精华"是马来西亚教育部于1987年颁布的《中学华文课程纲要》中,推向国立中学华文课增添的新教学项目。"名句精华"编排在语文基础之下,是华文科目的其中一个学习内容。"名句精华"从中国古典文学、经典及传统俗语中摘选佳句,以加深学生对固有文化和伦理道德的认识。"名句精华"推行至今,分别于2000年的《中学华文课程大纲》及2015年《中学华文课程标准》中经历重大的改革。2017年起,中一华文课程不再学习"名句精华"的部分,虽然中二华文依然沿用旧的课程,但不久的将来"名句精华"教学将成为历史。在马来西亚中学华文课经过一系列的课程大纲与考试大纲的修订后,本文对"名句精华"推行至今的发展演变进行探讨,为将近30年的"名句精华"教学作出梳理与总结。除了将"名句精华"课程内容的演变及其考核方式的改革进行个别对比外,更通过不同类型的中学华文教师的远程访谈,了解"名句精华"的教学实施现状与发展,最后对"名句精华"的定位、教学近况及其发展这三个部分的探讨作下研究结论。

关键词：马来西亚中学华文教育名句精华教学发展现状

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Graphene/RuO2 nanocrystal composites as sulfur host for lithium-sulfur batteries

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Journal of Energy Chemistry 2019年第8期28卷 204-211,I0007页

作者： Jian-Qiu Huang Jiaqiang Huang woon Gie chong Jiang Cui Shanshan Yao Baoling Huang Jang-Kyo Kim Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology

An optimized graphene/RuO2/S composite is prepared by hydrothermal growth of RuO2 particles on graphene oxide sheets as the positive electrode for rechargeable lithium-sulfur batteries. The electrode with 6.1 wt% RuO2 nanocrystals and a high sulfur content of 79.0 wt% delivers an optimal electrochemical performance with high residual capacities of 508 mAh g-1 after 200 cycles and 389 m Ah g-1 after800 cycles at 1 C with a low capacity decay of 0.054%. The RuO2 nanocrystals promote the redox reaction kinetics and facilitate the transformation of sulfur chemistry, leading to large improvements in reversibility and rate capability of the composite electrode. The density functional theory calculations signify the formation of Li–O and Ru–S bonds through chemical interactions between RuO2 and Li polysulfides while the adsorption energies between graphene and polysulfide species are much higher in the presence of RuO2 than that of the neat graphene acting alone. These discoveries support the efficient entrapment of polysulfides by the composite electrode to the benefit of enhanced cyclic stability of the battery.

关键词： Enhanced redox reaction kinetics Polysulfide adsorption Density functional theory Lithium sulfur batteries High sulfur content

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论二十世纪马来西亚华人作家对“中国”的书写

论二十世纪马来西亚华人作家对“中国”的书写

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作者：庄慧文（chong Fei woon）西北大学

学位级别：硕士

在百余年的离散生活与社会变迁中,马来西亚华人与中国之间的关系成为确定自我认知和自我定义的重要一环。对于“概念中国”“文化母国”的深厚情怀,马来西亚华人以不同的方式追寻并书写着“中国”,并通过这一重要维度来确立自己在马来... 详细信息

在百余年的离散生活与社会变迁中,马来西亚华人与中国之间的关系成为确定自我认知和自我定义的重要一环。对于“概念中国”“文化母国”的深厚情怀,马来西亚华人以不同的方式追寻并书写着“中国”,并通过这一重要维度来确立自己在马来西亚社会文化秩序中的民族角色和身份建构。二十世纪初,旅居马来亚的华人通过报刊、书籍抒发与母国命运与共的思想情感,五十年代到八十年代的隔绝时期,他们以祖籍记忆与中国想象延续着华人文化元素,解禁后,越来越多的华人踏上中国大陆,以游记、报刊、书籍等来记录他们的访华体验,他们笔下“真实的中国”与概念化的、历史化的、文本化的中国空间进行对话,在与“中国”的互映关系中确认自我的主体性与独特性。本论文以马来西亚华人作家在不同时期书写“中国”的内容与方式为研究对象,首先梳理二十世纪初新马华侨文学中的“中国情结”的体现,然后重点以八十年代末以来的马来西亚华人作家的访华游记为文本,结合其他形式的作品如诗歌、散文,报刊报道等文献资料,分析马华作家对地理的、现实中国的书写,以及对诗意的、文化中国的想象。马华作家通过想象与写实等方式书写“中国”的同时,也传递出对马来西亚华族命运以及华人身份认同问题的思考。马来西亚华人身处多元文化体系之中,经历一系列文化冲突与困扰,当代马来西亚华人延续着父辈的“中国情结”,以亲历的方式书写中国的同时,也在进行自我身份整合。一方面他们认同中华文明,另一方面也接受并融合本土的马来文化、西方文化及伊斯兰文化,进而确立自身独特性的存在。马来西亚华人表现出的文化认同定位和身份建构趋向,不仅是海外离散华人的共同体验,也是在世界日益全球化过程中,每一个民族在本土与外来、传统与现代的多元文化格局中如何建构自我文化身份的问题。

关键词：马来西亚华人中国情结旅行写作身份认同

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Comparison of clinical outcomes between culprit vessel only and multivessel percutaneous coronary intervention for ST-segment elevation myocardial infarction patients with multivessel coronary diseases

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Journal of Geriatric Cardiology 2015年第3期12卷 208-217页

作者： Kwang Sun Ryu Hyun Woo Park Soo Ho Park Ho Sun Shon Keun Ho Ryu Dong Gyu Lee Mohamed EA Bashir Ju Hee Lee Sang Min Kim Sang Yeub Lee Jang Whan Bae Kyung Kuk Hwang Dong woon Kim Myeong chan Cho Young Keun Ahn Myung Ho Jeong chong Jin Kim Jong Seon Park Young Jo Kim Yang Soo Jang Hyo Soo Kim Ki Bae Seung Database and Bioinformatics Laboratory School of Electrical and Computer Engineering Chungbuk National University Cheongju Chungbuk South Korea Human Genome Center Institute of Medical Science University of Tokyo Minatoku Tokyo Japan Faculty of Computer Science and Information Technology University of Meddcal Sciences and Technology Khartoum Sudan Regional Curdiovcascular Disease Center Chungbuk National University Ho spital Cheonglu Chungbuk South Korea Division of Cardiology Department of Internal Medicine College of Medicine Chungbuk National University Cheongju Chungbuk South Korea Department of Cardiology Chonnam National University Hospital Donggu Gwangju South Korea Department of Internal Medicine Kyunghee University Gangdong Hospital Seoul South Korea Department of Internal Medicine Yeungnam University Hospital Medical Center Daegu South Korea Division of Cardiology Yonsei University Severance Hospital Seoul South Korea Cardiovascular Center and Department of Internal Medicine Seoul National University Hospital Seoul South Korea Department of Cardiovascular Medicine Catholic University St. Mary's Hospital Seoul South Korea

Background The clinical significance of complete revascularization for ST segment elevation myocardial infarction （STEMI） pa- tients during admission is still debatable. Methods A total of 1406 STEMI patients from the Korean Myocardial Infarction Registry with multivessel diseases without cardiogenic shock who underwent primary percutaneous coronary intervention （PPCI） were analyzed. We used propensity score matching （PSM） to control differences of baseline characteristics between culprit only intervention （CP） and multivessel percutaneous coronary interventions （MP）, and between double vessel disease （DVD） and triple vessel disease （TVD）. The major adverse cardiac event （MACE） was analyzed for one year after discharge. Results TVD patients showed higher incidence of MACE （14.2% vs. 8.6%, P = 0.01）, any cause of revascularization （10.6% vs. 5.9%, P - 0.01）, and repeated PCI （9.5% vs. 5.7%, P = 0.02）, as compared to DVD patients during one year after discharge. MP reduced MACE effectively （7.3% vs. 13.8%, P = 0.03）, as compared to CP for one year, but all cause of death （1.6% vs. 3.2%, P= 0.38）, Ml （0.4% vs. 0.8%, P = 1.00）, and any cause ofrevascularization （5.3% vs. 9.7%, P = 0.09） were comparable in the two treatment groups. Conclusions STEMI patients with TVD showed higher rate of MACE, as compared to DVD MP performed during PPCI or ad hoc during admission for STEMI patients without cardiogenic shock showed lower rate of MACE in this large scaled database. Therefore, MP could be considered as an effective treatment option for STEMI patients without cardiogenic shock.

关键词： Culprit only intervention Multivessel intervention Multivessel coronary disease Myocardial infarction Primary percutaneous coronary intervention

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乙炔在Ge(001)表面吸附的反应路径(英文)

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物理化学学报 2012年第5期28卷 1107-1112页

作者：范晓丽刘燕刘崇刘焕明西北工业大学材料科学与工程学院西安710072 北京计算科学研究中心北京100084 成都绿色能源与绿色科技研发中心成都610207

采用第一性原理方法研究了乙炔分子在Ge(001)表面的吸附反应.通过系统考察0.5和1.0ML覆盖度时形成di-σ和end-bridge构型的反应路径,研究在表面形成di-σ和paired-end-bridge构型的反应几率.除了表面反应以外,本文还涉及了亚表层Ge原子... 详细信息

采用第一性原理方法研究了乙炔分子在Ge(001)表面的吸附反应.通过系统考察0.5和1.0ML覆盖度时形成di-σ和end-bridge构型的反应路径,研究在表面形成di-σ和paired-end-bridge构型的反应几率.除了表面反应以外,本文还涉及了亚表层Ge原子参与的吸附反应,乙炔在亚表层原子上吸附形成的亚稳态结构sub-di-σ,是形成end-bridge结构的第二条途径,此反应机理对于表面吸附结构的形成起重要的作用.与乙炔分子不同的是,表面以下原子参与时乙烯分子的吸附反应为吸热反应.综合热力学和动力学的分析表明,paired-end-bridge构型是乙炔分子吸附的主要构型,此结论解释了乙炔分子在Ge(001)表面吸附构型的实验结果.对于乙烯和乙炔两分子在Ge(001)表面吸附的分析比较揭示了导致两者之间差异的原因.

关键词：密度泛函理论 Ge(001)表面乙炔分子形成反应亚表层热力学动力学

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