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An atmospheric water harvester with fast and energy-saving water removal and recovery

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Biosurface and Biotribology 2023年第1期9卷 9-16页

作者： Jiayu Song Zhang Liu Jhoanne Pedres Boñgol Zhaoxin Zhang king lun yeung Department of Chemical and Biological Engineering the Hong Kong University of Science and TechnologyKowloonHong Kong Division of Environment and Sustainability the Hong Kong University of Science and TechnologyKowloonHong Kong Division of Emerging Interdisciplinary Areas The Hong Kong University of Science and TechnologyKowloonHong Kong HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute ShenzhenGuangdongChina

Moisture removal and water recovery from the air are vital for regulating indoor humidity and mitigating water *** atmospheric water harvesters(AWH)focus primarily on increasing the moisture capture rate,but for it to be economical and sustainable,it is essential to consider the energy required to recover and harvest the captured ***,a mechanically flexible,biphilic sorption-based AWH made of green,environmentally friendly material is *** consists of a hygroscopic chitosan polymer embedded within a flexible,hydrophobic silica xerogel that can harvest 86.3 g water/g chitosan at 97%relative humidity and 25℃reaching saturation after 30 days(i.e.2.88 g water/g chitosan/day).Roughly 88%of the sorbed moisture was recovered by mechanical squeezing(ca.0.020 MPa)within 150 *** water harvesting experiments and uniaxial compression tests demonstrate that chitosan-silica xerogel is durable for longterm operations,providing a fast,reliable,and sustainable moisture removal and water harvesting tool.

关键词： atmospheric water harvesting flexible xerogel heterogeneous wettability mechanical water recovery

澄清溶液体系二次生长法NaA型沸石膜的生长机制及膜厚的控制合成

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高等学校化学学报 2005年第5期26卷 806-810,F005页

作者：张雄福刘海鸥 king-lun yeung 王金渠大连理工大学化工学院化学工艺系吸附与无机膜研究所大连116012 香港科技大学化学工程系

用晶种涂层二次生长成膜法研究了在含水量不同的澄清溶液合成体系中NaA型沸石膜的生长及沸石膜厚度的控制合成.用SEM,TEM和XRD表征手段分析了沸石膜的形成过程和微结构.在载体表面不涂晶种而直接合成则不易形成连续沸石膜;用晶种涂层二... 详细信息

用晶种涂层二次生长成膜法研究了在含水量不同的澄清溶液合成体系中NaA型沸石膜的生长及沸石膜厚度的控制合成.用SEM,TEM和XRD表征手段分析了沸石膜的形成过程和微结构.在载体表面不涂晶种而直接合成则不易形成连续沸石膜;用晶种涂层二次法可以很容易形成均匀的连续膜.合成液中水量的高低强烈影响沸石膜的生长速率、形成结构和膜的厚度.在高水量(水硅摩尔比为2000)的合成体系中沸石生长速率慢,膜主要通过晶种层中的晶粒长大,交织成膜,且膜只有一层结构;而在低水量(水硅摩尔比为750)的合成体系中沸石生长速率快,膜则通过晶种层表面晶粒向外生长、交织成膜,而膜具有两层结构.通过调变合成液的水量可有效地控制沸石膜层的厚度,并能制得非常均匀、连续的膜.

关键词： NaA 沸石分子筛膜无机膜

用亚微米级晶种涂层法合成NaA沸石膜及其结构表征

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催化学报 2004年第7期25卷 586-590页

作者：张雄福刘海鸥王金渠 king lun yeung 大连理工大学化工学院化学工艺系吸附与无机膜研究所辽宁大连116012 香港科技大学化学工程系

在大孔α Al2 O3 陶瓷管载体上 ,采用亚微米级晶种涂层法在澄清溶液体系中二次生长成膜 ,制备了NaA沸石膜 .采用TEM ,SEM和XRD等手段对晶种、陶瓷载体及沸石膜的结构、晶体形貌和成膜情况进行了表征 .结果表明 ,合成晶种的晶粒呈立方体 ... 详细信息

在大孔α Al2 O3 陶瓷管载体上 ,采用亚微米级晶种涂层法在澄清溶液体系中二次生长成膜 ,制备了NaA沸石膜 .采用TEM ,SEM和XRD等手段对晶种、陶瓷载体及沸石膜的结构、晶体形貌和成膜情况进行了表征 .结果表明 ,合成晶种的晶粒呈立方体 ,颗粒小 (约 1 5 0nm)而均匀 ,无杂晶 ,可作为晶种在载体上进行预涂 .载体的孔径大而不均匀 ,表面粗糙不平整 ,直接成膜则表面仅有较少的沸石晶粒沉积 ,不能连续成膜 .经亚微米级晶种涂层后 ,载体表面形成了一层均匀、光滑的晶种层(厚度为 2～ 3μm) ;水热晶化成膜后 ,膜表面晶粒相互交织生长完好 ,无晶间隙 ,所得膜致密 ,连续 ,规整 ,清晰 ,无裂缺 .

关键词： NaA沸石沸石膜二次合成晶种涂层

Non-UV germicidal activity of fresh TiO_2 and Ag/TiO_2

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Journal of Environmental Sciences 2009年第5期21卷 700-706页

作者： LIU Lifen John Barford yeung king lun Key Laboratory of Industrial Ecology and Environmental Engineering Ministry of Education of China School of Environmental and Biological Science & Technology Dalian University of Technology Dalian 116024 China Department of Chemical Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong 999077 China

Fresh TiO2 was found to possess a strong germicidal activity even without UV irradiation. Live Yeast （Saccharomyces cerevisiae） cells in contact with fresh TiO2 were found deformed and dead after 15min contact. The cause of germicidal activity was discussed from the observed cell deformation, lysis and increased absorption at 1680 cm^-1 in FT-IR spectra of the affected cells, which proved the oxidizing effect of fresh TiO2 to cells. The deformation caused by the stretching of cell wail and pressure built-up inside the cell, led to cell burst and release of intracellular materials. The degree of cell deformation was found positively related with the wetting property of TiO2. Cells are negatively charged, for Gram-negative cell （thinner ceil wail）, a higher germicidal effect was observed than Gram-positive cells. The germicidal effect of TiO2 gradually decreased after exposure to air at room temperature, as the wetting property decreased. This kind of germicidal activity was more effective compared to other germicidal process such as UVA/TiO2 or Ag＋. This shed light on designing new germicidal material either maintained by visible light irradiation, or by oxidation effect generated by reactive oxygen species.

关键词： germicidal activity titanium dioxide non-UV

Non-UV based germicidal activity of metal-doped TiO_2 coating on solid surfaces

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Journal of Environmental Sciences 2007年第6期19卷 745-750页

作者： LIU Li-fen John Barford yeung king lun SI Grace School of Environmental and Biological Science and Technology Dalian University of Technology Dalian 116023 China Department of Chemical Engineering Hong Kong University of Science and Technology Clear Water Bay Road Kowloon HK SAR

A stain-based screening method was developed to screen different catalyst coatings for their germicidal activity. A Baclight dead/live bacteria viability kit （invitrogen, molecular probes） was used for staining the cell. The screening was carried out following a standard procedure. This included loading cell suspension to solid surface and maintaining contact for 30 min, then staining with a mixture containing dyes. The stained cells were observed using an epifluorescent microscope and photographed with a CCD camera under UV. Metal-doped TiO2 coatings on AI plates were prepared and tested for non-UV germicidal activity without using UV. It was tested using model microorganisms such as Bakers Yeast （Saccharomyces cerevisiae）, Bacillus subtilis, Pseudomonas putida, and Escherichia coli. On the basis of the germicidal activity of catalyst and the degree of damage caused to the cells, the stained cells may appear green （viable）, green with red or yellow nuclei and yellow （compromised） or red （nonviable）. According to their stained color, cells were counted to calculate the percentage of dead, live, and compromised cells. Compromised cells are cells that grow very slowly after reculturing indicating a degree of reversible cell damage. Screening the germicidal activity using this staining method is accurate and efficient, and requires less time than the culture-based method. A modification to the procedure for measuring germicidal activity of rough surfaces or fibrous coatings was developed. Both TiO2 and metal-doped TiO2 （Ag, Pt, Au, Cu） possess non-UV based germicidal activity. The germicidal activity of TiO2 was found to be related with its wetting property and can be improved by UV irradiation before testing. It is not greatly affected by contact time, indicating a fast acting germicidal activity.

关键词： staining germicidal activity TiO2 coating

Population Dynamics in an Advective Environment

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Communications on Applied Mathematics and Computation 2024年第1期6卷 399-430页

作者： king-yeung Lam Ray Lee Yuan Lou Department of Mathematics The Ohio State UniversityColumbusOH43210USA School of Mathematical Sciences CMA-Shanghai and MOE-LSCShanghai Jiao Tong UniversityShanghai200240China

We consider a one-dimensional reaction-diffusion equation describing single-and two-species population dynamics in an advective environment,based on the modeling frameworks proposed by Lutscher et *** *** analyze the effect of rate of loss of individuals at both the upstream and downstream *** the single-species case,we prove the existence of the critical domain size and provide explicit formulas in terms of model *** further derive qualitative properties of the critical domain size and show that,in some cases,the critical domain size is either strictly decreasing over all diffusion rates,or monotonically increasing after first decreasing to a *** also consider competition between species differing only in their diffusion *** two species having large diffusion rates,we give a sufficient condition to determine whether the faster or slower diffuser wins the *** also briefly discuss applications of these results to competition in species whose spatial niche is affected by shifting isotherms caused by climate change.

关键词： Reaction-diffusion-advection Critical domain size Competition Climate change

一种简单组装纳米沸石粒子层的方法及其二次法成膜研究

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高等学校化学学报 2006年第9期27卷 1593-1598页

作者：杨国辉张雄福刘海鸥王金渠 yeung king-lun 大连理工大学化工学院化学工艺系精细化工国家重点实验室大连116012 香港科技大学化学工程系

使用一种简单、新颖的纳米沸石晶体自组装方法,以γ-氨丙基三甲氧基硅烷(AP-TMS)为偶联剂,成功地实现了纳米A型沸石粒子在多孔不锈钢、陶瓷以及单晶硅表面的沉积组装,获得了覆盖度高的连续、均匀的沸石粒子层.组装过程在合成釜内分为载... 详细信息

使用一种简单、新颖的纳米沸石晶体自组装方法,以γ-氨丙基三甲氧基硅烷(AP-TMS)为偶联剂,成功地实现了纳米A型沸石粒子在多孔不锈钢、陶瓷以及单晶硅表面的沉积组装,获得了覆盖度高的连续、均匀的沸石粒子层.组装过程在合成釜内分为载体功能化和晶种化两步.以该沸石粒子层为晶种二次法成膜,形成了交织生长的连续、均匀的沸石膜,并用含少量水的苯甲醛混合液评价了微型膜的渗透蒸发性能,水-苯甲醛分离系数超过10000以上.考察了使用γ-氨丙基三甲氧基硅烷(AP-TMS)、γ-氯丙基三甲氧基硅烷(CP-TMS)和γ-巯丙基三甲氧基硅烷(SP-TMS)三种不同偶联剂时,纳米A型沸石晶体在多孔不锈钢、陶瓷以及单晶硅表面的自组装效果.研究发现,使用CP-TMS作为偶联剂时,只在不锈钢载体上形成较为连续的粒子层,而使用SP-TMS作为偶联剂时,在三种载体上纳米A型沸石粒子均不能沉积形成粒子层.对偶联剂的作用和粒子组装机制进行了讨论和预测.

关键词：自组装沸石膜无机膜微反应器

Assessment of Sericin Biosorbent for Selective Dye Removal

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Chinese Journal of Chemical Engineering 2012年第3期20卷 426-432页

作者： CHEN Xinqing LAM Koon Fung MAK Shuk Fong CHING Wai Kwong NG Tsz Nok yeung king lun Department of Chemical and Biomolecular Engineering Division of Environment the Hong Kong University of Science and TechnologyHong KongChina

The silk sericin is the main residue in silk production and it is found to be a low cost and efficient bio-sorbent. In this study, sericin was characterized with various techniques including SEM （scanning electron micro- scope）, XRD, N2 physisorption, FTIR （Fourier transformed infrared spectroscopy） and XPS （X-ray photoelectron spectroscopy）. The nitrogen content of sericin was ca. 8.5 mmol.g-1 according to elemental analysis. Dye adsorption by sericin biosorbent was investigated with the acid yellow （AY）, methylene blue （MB） and copper （II） phthalocyanine-3,4＇4＂4＇＂-tetrasulfonic acid （CuPc） dyes from water. Sericin displayed large capacity for AY andCuPc adsorption with adsorption capacities of respectively 3.1 and 0.35 mmol.g-1, but it did not adsorbed methyl- ene blue dye. This selectivity is due to the basicity of amide groups in seriein biosorbents.

关键词： dye adsorption silk protein biosorbent

Family socioeconomic position and abnormal birth weight:evidence from a Chinese birth cohort

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World Journal of Pediatrics 2019年第5期15卷 483-491页

作者： Si Tu Ao-Lin Wang Mei-Zhen Tan Jin-Hua Lu Jian-Rong He Song-Ying Shen Dong-Mei Wei Min-Shan Lu Shiu lun Au yeung Hui-Min Xia Xiu Qiu Division of Birth Cohort Study Guangzhou Women and Children's Medical CenterGuangzhou Medical UniversityNo.9 Jinsui RoadZhujiang NewtownTianhe DistrictGuangzhou 510623China Department of Women and Child Health Care Guangzhou Women and Children's Medical CenterGuangzhou Medical UniversityGuangzhouChina Department of Neonatal Surgery Guangzhou Women and Children's Medical CenterGuangzhou Medical UniversityGuangzhouChina Program on Reproductive Health and the Environment and Bakar Computational Health Sciences Institute University of CaliforniaSan FranciscoCAUSA Department of Child Health Care Guangzhou Women and Children's Medical CenterGuangzhou Medical UniversityGuangzhouChina Nuffield Department of Women's and Reproductive Health University of OxfordOxfordUK School of Public Health Li Ka Shing Faculty of MedicineThe University of Hong KongHong KongSARChina Department of Obstetrics and Gynecology Guangzhou Women and Children's Medical CenterGuangzhou Medical UniversityGuangzhouChina

Background Birth weight is a strong determinant of infant short-and long-term health *** socioeconomic position(SEP)is usually positively associated with birth *** this association extends to abnormal birth weight or there exists potential mediator is *** We analyzed data from 14,984 mother-infant dyads from the Born in Guangzhou Cohort *** used multi-variable logistic regression to assess the associations of a composite family SEP score quartile with macrosomia and low birth weight(LBW),and examined the potential mediation effect of maternal pre-pregnancy body mass index(BMI)using causal mediation *** The prevalence of macrosomia and LBW was 2.62%(n=392)and 4.26%(n=638).Higher family SEP was associated with a higher risk of macrosomia(OR 1.30,95%CI 0.93-1.82;OR 1.53,95%CI 1.11-2.11;and OR 1.59,95%CI 1.15-2.20 for the 2nd,3rd,and 4th SEP quartile respectively)and a lower risk of LBW(OR 0.69,95%CI 0.55-0.86;OR 0.76,95%CI 0.61-0.94;and OR 0.61,95%CI 0.48-0.77 for the 2nd,3rd,and 4th SEP quartile respectively),compared to the 1st SEP *** found that pre-pregnancy BMI did not mediate the associations of SEP with macrosomia and *** Socioeconomic disparities in fetal macrosomia and LBW exist in Southern *** the results can be applied to other populations should be further investigated.

关键词： Birth cohort Low birth weight Macrosomia Socioeconomic position