Chun Ho Lam

City University of Hong Kong

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Co-Authors

Shuquan Huang

Kunming University of Science and Technology

Yangxin Jin

City University of Hong Kong

Paul T. Anastas

Yale University

Bing Song

Southeast University

James E. Jackson

Michigan State University

Mahlet Garedew

Yale University

Theodora Nah

City University of Hong Kong

Christopher M. Saffron

Michigan State University

Qi Zhu

City University of Hong Kong

Shengqin Liu

City University of Hong Kong

Cooperative Institutions

City University of Hong Kong

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Sun Yat-sen University

Huazhong University of Science and Technology

University of Hong Kong

Nanjing University

Yale University

University of Science and Technology of China

City University of Hong Kong, Shenzhen Research Institute

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Mild electrocatalytic hydrogenation and hydrodeoxygenation of bio-oil derived phenolic compounds using ruthenium supported on activated carbon cloth

Green Chemistry (2012)

Zhenglong Li Mahlet Garedew Chun Ho Lam James E. Jackson Dennis J. Miller

Electrocatalytic hydrogenation (ECH) is an option for stabilizing or upgrading bio-oil that employs mild conditions (≤80 °C and ambient pressure) compared to hydrotreatment. In this study, phenol, guaiacol (2-methoxyphenol), and syringol (2,6-dimethoxyphenol) were chosen as model lignin-like substrates because of their abundance in bio-oil and their high resistance to hydrogenation relative to the carbonyl compounds. Cathodic reduction was catalyzed by ruthenium supported on activated carbon cloth (Ru/ACC), a novel electrocatalyst. Incipient wetness impregnation and cation exchange methods were employed to prepare the electrocatalyst using three different ruthenium precursors. Scanning electron microscopy revealed that ruthenium nanoparticles within the range of 10 to 20 nm were deposited on the support by both catalyst synthesis methods. Catalysts prepared by cation exchange were more active than those prepared using incipient wetness impregnation, presumably because of support surface functionalization by the oxidation pretreatment. When using incipient wetness impregnation, catalysts synthesized with precursor hexaammineruthenium(III) chloride showed the best activity and electrochemical efficiency, followed by catalysts prepared with ruthenium(III) chloride and ruthenium(III) nitrosyl nitrate. The Ru/ACC electrocatalyst reduced guaiacol, phenol and syringol with similar electrochemical efficiencies, but temperature was an important variable; the electrochemical efficiency for guaiacol reduction increased from 8% at 25 °C to 17% at 50 °C, but then dropped back to 10% at 80 °C. Solution pH also affected catalyst activity and product selectivity, with acidic conditions favoring guaiacol conversion, electrochemical efficiency and cyclohexanol selectivity.

Guaiacol

Hydrodeoxygenation

Incipient wetness impregnation

10.1039/c2gc35552c

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Citations (161)

Enhancing the Properties of Photocatalysts via Nonthermal Plasma Modification: Recent Advances, Treatment Variables, Mechanisms, and Perspectives

Industrial & Engineering Chemistry Research (2021)

Qianqian Chen Bing Song Xiaochen Li Renjie Wang Shun Wang

Surface modification is crucial in improving catalyst activity, since all catalytic reactions occur on the surface of the catalyst. This review discusses the application of nonthermal plasmas (NTP) for surface modification and functionalization of heterogeneous photocatalysts. NTP pretreatment provides an environmentally friendly and effective means for functionalization, surface etching, and/or defect regulation on the surface of photocatalysts. The correlations between modification variables and the properties of catalysts are reviewed in depth. Moreover, insights into the modification mechanisms are reviewed to provide state-of-the-art understanding and suggest that more advanced modification can be achieved. Finally, challenges and perspectives for future studies are provided.

Surface Modification

Nonthermal plasma

Environmentally Friendly

10.1021/acs.iecr.1c03062

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Citations (10)

Key techno-economic barriers in the valorization of organic solid wastes for chemical production

One Earth (2024)

Jin‐Hua Mou Zi‐Hao Qin Season S. Chen Shao‐Yuan Leu Daniel C.W. Tsang

10.1016/j.oneear.2024.04.017

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Citations (3)

Electrochemical Hydrogenation of Refractory Organic Pollutants for Wastewater Treatment

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2024)

Shao Yun Shan Chun Ho Lam

Wastewater treatment is an essential process for the sustainable development of a society. The handling and degrading of different refractory and toxic organic pollutants heavily relies on conventional biodegradation. Herein, we developed an electrochemical hydrogenation method to enhance the biodegradability of organic substrates, which subsequently improves their availability to existing biological-driven denitrification, a key step that turned NO 3 - into harmless N 2 . The strategy presents an unprecedented "kill-two-birds-with-one-stone" method to simultaneously deal with excessive organic components, aka. Chemical Oxygen Demand (COD), and nitrate's presence in wastewater. The strategy was discovered by comparing the biodegradability of some organic compounds and their hydrogenation forms. It was found that the hydrogenation product was much more bioavailable. Motivated by this discovery, we synthesized a carbon-supported Ru electrode by electrodepositing Ru on activated carbon cloth (ACC), named Ru/ACC. After that, 4-chlorophenol was used to optimize the experimental conditions, and Ru/ACC electrodes successfully converted 99.9% of 4-chlorophenol with an overall yield reached 90.9%. After that, the Ru/ACC electrodes proved efficient in transferring various wastewater organic pollutants. Besides, the electrochemical hydrogenation effect on biochemical degradation and denitrification was studied. Our electrochemical treatment was significant for the electrochemical hydrogenation method to be applied to wastewater treatment.

Refractory (planetary science)

10.1149/ma2024-01442472mtgabs

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Citations (0)

Recent advances of lignin valorization techniques toward sustainable aromatics and potential benchmarks to fossil refinery products

Bioresource Technology (2021)

Rabia Jalil Khan Chun Yin Jerry Lau Jianyu Guan Chun Ho Lam Jun Zhao

Refinery

10.1016/j.biortech.2021.126419

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Citations (39)

Estimation of the riverine input of organic ultraviolet filters (OUVFs) from the Pearl River Estuary to the South China Sea during the early Covid-19 pandemic

The Science of The Total Environment (2023)

Jiaji Sun Huiju Lin Yichun Lu Yuefei Ruan Chun Ho Lam

Pandemic

10.1016/j.scitotenv.2023.168147

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Citations (5)

Rhombohedral ZnIn₂S₄-catalysed anodic direct electrochemical oxidative cleavage of C–O bond in α-O-4 linkages in ambient conditions

Green Chemistry (2024)

Qi Zhu Bo Gong Shuquan Huang Yangxin Jin Shengqin Liu

The electrochemical selective oxidative transformation of lignin feedstocks into valuable oxygenated aromatics is essential to establish a sustainable biorefinery.

Trigonal crystal system

Cleavage (geology)

Oxidative cleavage

Bond cleavage

Anodic oxidation

10.1039/d4gc00338a

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Citations (6)

Coke Formation during Thermal Treatment of Bio-oil

Energy & Fuels (2020)

Xun Hu Zhanming Zhang Mortaza Gholizadeh Shu Zhang Chun Ho Lam

Bio-oil is a mixture of organics produced from pyrolysis of biomass. The organics in bio-oil serve as the feedstock for the production of hydrogen, chemicals, biofuels, and carbon materials. In many processes for conversion of bio-oil, heating is required. The thermal treatment of bio-oil induces the polymerization/cracking of the organics in bio-oil, producing coke. Coke could lower the carbon conversion efficiency of bio-oil, clog the reactor chamber, and deactivate the catalyst, imposing the main challenge for the utilization of bio-oil involving the heating of bio-oil. This review investigates the coking issues in the processes for bio-oil upgrading including esterification, hydrotreatment, catalytic pyrolysis, pyrolysis, steam reforming, and the process for the conversion of bio-oil to carbon materials. The properties of coke formed from thermal treatment of bio-oil, the mechanism for coking of bio-oil, and the methods developed for tackling the coking of bio-oil are the focus.

Fluid catalytic cracking

Carbon fibers

Pyrolysis oil

10.1021/acs.energyfuels.0c01323

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Citations (145)

Electrocatalytic Reductive Amination and Simultaneous Oxidation of Biomass-Derived 5-Hydroxymethylfurfural

Industrial & Engineering Chemistry Research (2022)

Man Zhang Di Hu Yu‐Wen Chen Yangxin Jin Biying Liu

Simultaneous upgrading of biomass derivatives on highly efficient nonprecious metal-electrocatalysts is still an unprecedented challenge. We propose an electrocatalytic reductive amination and simultaneous oxidation (ERAO) route to convert biomass-derived 5-hydroxymethylfurfural (HMF) into valuable 2-hydroxymethyl-5-(ethanolamine methyl)furan (HEMF) at the cathode side and 2,5-furandicarboxylic acid (FDCA) at the anode. Accordingly, the cathode and anode electrode materials of the ERAO electrolyzer are titanium-based metal–organic framework (Ti-MOF) cubes and NiCoFe-LDHs nanosheets, respectively. The overall ERAO shows very good performance with ∼68% conversion of HMF after 6 h reaction, which is closely related to the exposed N–Ti–O active center from Ti-MOF and porous structure in providing extra access to the internal sites. The good stability of these catalysts after ERAO was further investigated. This work provides a sustainable route for biomass upgrading using the highly efficient nonprecious metal electrocatalysts.

Reductive amination

5-hydroxymethylfurfural

10.1021/acs.iecr.1c04508

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Citations (15)

Intravenous fluid selection rationales in acute clinical management

World Journal of Emergency Medicine (2017)

Wing Yan Shirley Cheung Wai Kwan Cheung Chun Ho Lam Yeuk Wai Chan Hau Ching Chow

BACKGROUND: Intravenous fl uid (IVF) is commonly used in acute clinical management.This study aimed to review the choice and primary considerations in IVF prescriptions and to evaluate the adequacy of guidelines and trainings on it in the New Territories West Cluster (NTWC) of Hong Kong.METHODS: This is a descriptive study based on data collected from an online survey.Data were processed by SPSS for statistical analysis.This study focused on a general description and doctor-nurse between group comparison.Participants were asked the choice of IVF for nine acute clinical scenarios and provide reason.A 1-10 scale was used to assess the suffi ciency of guideline, training and information, and time for revision on IVF prescription.RESULTS: 0.9% sodium chloride was the most familiar IVF (36%), followed by 5% Dextrose solution (26%).In the nine scenarios, the most chosen IVF was 0.9% sodium chloride (37%-61%).There was significant difference in the choice of IVF between doctors and nurses in 7 cases.The second most chosen IVF for doctors was Plasma-Lyte A while that for nurses was Gelofusine.Departmental practice was the most chosen reason to account for the prescription.The adequacy of guideline, information and training, and time for revision was rated 5. Doctors had signifi cantly more time at work than nurses to update knowledge in IVF prescription (5.41 versus 4.57).CONCLUSION: 0.9% sodium chloride was mostly chosen.The choice of IVF was mainly based on departmental practice.Adequacy of guideline, information and training, and time for revision on IVF prescription were average, indicating signifi cant training defi cit.

Guideline

Clinical Practice

10.5847/wjem.j.1920-8642.2018.01.002

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Citations (2)