Search results for: Daniel C.W. Tsang

Items from 1 to 20 out of 112 results

article

Revealing Intrinsic Relations Between Cu Scales and Radical/Nonradical Oxidations to Regulate Nucleophilic/Electrophilic Catalysis

Zhonghao Wan, Yang Cao, Zibo Xu, Xiaoguang Duan, more

Advanced Functional Materials > 33 > 12 > n/a - n/a

Copper/carbon catalysts under different electron‐transfer regimes can evolve both radical and nonradical pathways in peroxide activation. However, the underlying trigger to manipulate the transition in between is unclear. Herein, it is revealed that Cu species in a state of sub‐nanometre particles (SNPs, < 1 nm) exhibits an electrophilic nature, which is opposite to its nucleophilic nature at a...

article

Influence of soil properties and feedstocks on biochar potential for carbon mineralization and improvement of infertile soils

Ali El-Naggar, Sang Soo Lee, Yasser Mahmoud Awad, Xiao Yang, more

Geoderma > 2018 > 332 > C > 100-108

The impact of biochar (BC) application on soil varies with BC feedstock and soil type. The objective of this study was to investigate the linkage between the properties and surface functionality of various BCs and their role in the rehabilitation of two infertile soils. Sandy loam (SL) and sandy (S) soils were collected from agricultural areas in Korea and Vietnam, respectively. The BCs of amur silvergrass...

article

Characterization of bioenergy biochar and its utilization for metal/metalloid immobilization in contaminated soil

Xiao Yang, Avanthi D. Igalavithana, Sang-Eun Oh, Hyungseok Nam, more

Science of The Total Environment > 2018 > 640-641 > C > 704-713

This study is a comparison of the effect of biochar produced by bioenergy systems, via the pyrolysis and gasification processes, on the immobilization of metals/metalloids in soil. Because the processes for these two techniques vary, the feedstocks undergo different heating regimens and, as a result, their respective char products exhibit different physico-chemical properties. Therefore, this study...

article

Low-carbon and low-alkalinity stabilization/solidification of high-Pb contaminated soil

Lei Wang, Kequan Yu, Jiang-Shan Li, Daniel C.W. Tsang, more

Chemical Engineering Journal > 2018 > 351 > C > 418-427

Stabilization/solidification (S/S) is a low-cost and time-efficient method for soil remediation, however, delayed hydration reactions and high carbon footprint are major limitations for the treatment of high-Pb contaminated soil. This study develops a novel and low-carbon approach that combines ground granulated blast furnace slag (GGBS) and ordinary Portland cement (PC) with phosphate-/sulphate-rich...

article

Phosphoric acid-activated wood biochar for catalytic conversion of starch-rich food waste into glucose and 5-hydroxymethylfurfural

Leichang Cao, Iris K.M. Yu, Daniel C.W. Tsang, Shicheng Zhang, more

Bioresource Technology > 2018 > 267 > C > 242-248

The catalytic activity of engineered biochar was scrutinized for generation of glucose and hydroxymethylfurfural (HMF) from starch-rich food waste (bread, rice, and spaghetti). The biochar catalysts were synthesized by chemical activation of pinewood sawdust with phosphoric acid at 400–600 °C. Higher activation temperatures enhanced the development of porosity and acidity (characterized by COPO₃ and...

article

Recycling dredged sediment into fill materials, partition blocks, and paving blocks: Technical and economic assessment

Lei Wang, Liang Chen, Daniel C.W. Tsang, Jiang-Shan Li, more

Journal of Cleaner Production > 2018 > 199 > C > 69-76

Management of dredged sediment has been a worldwide challenge. Conventional off-site marine disposal of contaminated sediment incurs substantial cost implications and secondary pollution risks. This study developed value-added and time-effective approaches that transform contaminated sediment into construction materials to be used as fill materials, partition blocks, and paving blocks. The technical...

article

The utilization of zinc recovered from alkaline battery waste as metal precursor in the synthesis of metal-organic framework

Kowsalya Vellingiri, Daniel C.W. Tsang, Ki-Hyun Kim, Akash Deep, more

Journal of Cleaner Production > 2018 > 199 > C > 995-1006

In the treatment of spent wastes, seeking extra economic incentives (e.g., through their regeneration into value-added end products) along with environmental protection is a highly ideal option to consider. In this context, a process was developed to utilize spent alkaline battery waste as a source medium of zinc (Zn²⁺) ions for the synthesis of a high-value material, metal organic frameworks (MOFs)...

article

Life-cycle assessment on food waste valorisation to value-added products

Chor-Man Lam, Iris K.M. Yu, Shu-Chien Hsu, Daniel C.W. Tsang

Journal of Cleaner Production > 2018 > 199 > C > 840-848

Food waste can serve as a potential substitute for fossil-derived feedstocks for producing value-added chemicals, such as hydroxymethylfurfural (HMF), yet their environmental performance has not yet been evaluated, thus impeding informed decision-making. This study aims to develop a life-cycle assessment (LCA) framework to guide decisions on selecting the most environmentally favourable food waste...

article

Fabrication and characterization of hydrophilic corn stalk biochar-supported nanoscale zero-valent iron composites for efficient metal removal

Fan Yang, Shuaishuai Zhang, Yuqing Sun, Kui Cheng, more

Bioresource Technology > 2018 > 265 > C > 490-497

Pyrolyzing low-cost agro-waste into biochar is a promising means for waste biomass utilization. This study engineers corn stalk-derived biochar with abundant hydrophilic functional groups as a support material for iron nanoparticles impregnation (nZVI-HCS). Surface chemistry and morphology of nZVI-HCS composites is characterized by SEM, TEM, TG, XRD, FTIR, XPS, and BET techniques, which helps to elucidate...

article

Synthesis of nanomaterials from various wastes and their new age applications

Pallabi Samaddar, Yong Sik Ok, Ki-Hyun Kim, Eilhann E. Kwon, more

Journal of Cleaner Production > 2018 > 197 > P1 > 1190-1209

In this review, we scrutinized novel synthetic recipes for the fabrication of nanomaterials derived from various biowastes including crop residue, food waste, and industrial waste (e.g., spent battery waste and polythene waste). To this end, various pretreatment methods have been developed and applied for the conversion of wastes into useful forms of nanomaterials (e.g., metallic/carbon nanoparticles,...

article

Sorption of norfloxacin, sulfamerazine and oxytetracycline by KOH-modified biochar under single and ternary systems

Jiwei Luo, Xue Li, Chengjun Ge, Karin Müller, more

Bioresource Technology > 2018 > 263 > C > 385-392

Pollution of water by single antibiotics has been investigated in depth. However, in reality, a wide range of different contaminants is often mixed in the aquatic environment (contaminant cocktail). Here, single and competitive sorption dynamics of ionizable norfloxacin (NOR), sulfamerazine (SMR) and oxytetracycline (OTC) by both pristine and modified biochars were investigated. Sorption kinetics...

article

Photocatalytic reduction of CO2 to hydrocarbons using bio-templated porous TiO2 architectures under UV and visible light

Iman Hashemizadeh, Vladimir B. Golovko, Jungkyu Choi, Daniel C.W. Tsang, more

Chemical Engineering Journal > 2018 > 347 > C > 64-73

Artificial TiO₂ leaves with the morphology replicating that of Camellia tree leaves were synthesized through a multi-step bio-templating approach. Scanning and transmission electron microscopy images of the final products indicated that proposed method successfully replicates the highly porous structure of the leaf photosystem, down to the thylakoids. The hierarchical pore network and morphology of...

article

Biochar influences soil carbon pools and facilitates interactions with soil: A field investigation

Ali El‐Naggar, Yasser M. Awad, Xiang‐Yu Tang, Chen Liu, more

Land Degradation & Development > 29 > 7 > 2162 - 2171

Biochar promotes the storage of organic carbon (OC) in soils. OC is unevenly distributed in soils among different particle‐size fractions showing different structures, functions, and stability. The objective of this study was to investigate the biochar–soil interactions and the redistribution of soil C in different soil fractions based on a 2‐year field experiment. Fractionation was done by particle...

article

Contribution of pyrolytic gas medium to the fabrication of co-impregnated biochar

Dong-Wan Cho, Sohyun Kim, Daniel C.W. Tsang, Nanthi S. Bolan, more

Journal of CO 00002 Utilization > 2018 > 26 > C > 476-486

Co-impregnated biochars were fabricated by pyrolysis of spent coffee grounds (SCG) or glucose as carbon (C) sources under N₂ and CO₂. The formed biochar samples were characterized with FE-SEM, TEM/EDS, XRD, TGA, Raman, XPS, and BET, and further used as catalytic medium for the reduction of p-nitrophenol in the presence of NaBH₄. The physicochemical characteristics of biochar significantly changed...

article

Effects of calcium carbonate on pyrolysis of sewage sludge

Eilhann E. Kwon, Taewoo Lee, Yong Sik Ok, Daniel C.W. Tsang, more

Energy > 2018 > 153 > C > 726-731

This study demonstrates that calcium carbonate (CaCO₃) allows not only enhancement of the production of CO as syngas, but also reduction of the content of polycyclic aromatic hydrocarbons (PAHs) in the pyrolytic products from sewage sludge. CO₂ was formed by the decomposition of CaCO₃ in pyrolysis. The CO₂ derived from CaCO₃ enhanced thermal cracking of volatile organic carbons (VOCs) generated during...

article

In-situ biochar application conserves nutrients while simultaneously mitigating runoff and erosion of an Fe-oxide-enriched tropical soil

Chia-Hsing Lee, Chung-Chi Wang, Huan-Hsuan Lin, Sang Soo Lee, more

Science of The Total Environment > 2018 > 619-620 > C > 665-671

Climate change gives rise to rapid degradation of rural soils in sloping subtropical and tropical areas and might further threaten environmental sustainability. In this study, we conducted an integrated evaluation of the effects of wood biochar (WB) application mixed with a green waste dreg compost (GWC) on runoff quality, soil losses, and agricultural productivity for a highly weathered tropical...

article

Sorption, mobility, and bioavailability of PBDEs in the agricultural soils: Roles of co-existing metals, dissolved organic matter, and fertilizers

Xuan Zhu, Jingzi Beiyuan, Abbe Y.T. Lau, Season S. Chen, more

Science of The Total Environment > 2018 > 619-620 > C > 1153-1162

Polybrominated diphenyl ethers (PBDEs) are common pollutants released from electronic waste (e-waste) dismantling and recycling activities. Our city-wide survey of agricultural soils in Qingyuan (40 sampling sites), where e-waste recycling has been active, observed exceedance of PBDEs above background levels (average of 251.9ngg⁻¹, 87 times the regional baseline concentration) together with elevated...

article

Biochar application for the remediation of heavy metal polluted land: A review of in situ field trials

David O'Connor, Tianyue Peng, Junli Zhang, Daniel C.W. Tsang, more

Science of The Total Environment > 2018 > 619-620 > C > 815-826

Polluted land is a global issue, especially for developing countries. It has been reported that soil amendment with biochar may reduce the bioavailability of a wide range of contaminants, including heavy metal(loids), potentially reclaiming contaminated soils for agricultural use. However, there have been only limited reports on the in situ application of biochar at the field scale. This review was...

article

Date palm biochar-polymer composites: An investigation of electrical, mechanical, thermal and rheological characteristics

Anesh Manjaly Poulose, Ahmed Yagoub Elnour, Arfat Anis, Hamid Shaikh, more

Science of The Total Environment > 2018 > 619-620 > C > 311-318

The application of biochar (BC) as a filler in polymers can be viewed as a sustainable approach that incorporates pyrolysed waste based value-added material and simultaneously mitigate bio-waste in a smart way. The overarching aim of this work was to investigate the electrical, mechanical, thermal and rheological properties of biocomposite developed by utilizing date palm waste-derived BC for the...

article

Enhanced adsorption of arsenic onto alum sludge modified by calcination

Eun-Ki Jeon, Sori Ryu, Sung-Woo Park, Lei Wang, more

Journal of Cleaner Production > 2018 > 176 > C > 54-62

Alum sludge from water treatment facilities is composed mainly of aluminum hydroxide or aluminum oxide, which can adsorb As(V). However, microorganisms and organic/inorganic matter agglomerated together with raw alum sludge inhibit the adsorption of As(V) onto the material. Calcination was used to remove organic matter and activate the material, and the physical properties and adsorption characteristics...

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INFONA - science communication portal

Search results for: Daniel C.W. Tsang

Revealing Intrinsic Relations Between Cu Scales and Radical/Nonradical Oxidations to Regulate Nucleophilic/Electrophilic Catalysis

Influence of soil properties and feedstocks on biochar potential for carbon mineralization and improvement of infertile soils

Characterization of bioenergy biochar and its utilization for metal/metalloid immobilization in contaminated soil

Low-carbon and low-alkalinity stabilization/solidification of high-Pb contaminated soil

Phosphoric acid-activated wood biochar for catalytic conversion of starch-rich food waste into glucose and 5-hydroxymethylfurfural

Recycling dredged sediment into fill materials, partition blocks, and paving blocks: Technical and economic assessment

The utilization of zinc recovered from alkaline battery waste as metal precursor in the synthesis of metal-organic framework

Life-cycle assessment on food waste valorisation to value-added products

Fabrication and characterization of hydrophilic corn stalk biochar-supported nanoscale zero-valent iron composites for efficient metal removal

Synthesis of nanomaterials from various wastes and their new age applications

Sorption of norfloxacin, sulfamerazine and oxytetracycline by KOH-modified biochar under single and ternary systems

Photocatalytic reduction of CO2 to hydrocarbons using bio-templated porous TiO2 architectures under UV and visible light

Biochar influences soil carbon pools and facilitates interactions with soil: A field investigation

Contribution of pyrolytic gas medium to the fabrication of co-impregnated biochar

Effects of calcium carbonate on pyrolysis of sewage sludge

In-situ biochar application conserves nutrients while simultaneously mitigating runoff and erosion of an Fe-oxide-enriched tropical soil

Sorption, mobility, and bioavailability of PBDEs in the agricultural soils: Roles of co-existing metals, dissolved organic matter, and fertilizers

Biochar application for the remediation of heavy metal polluted land: A review of in situ field trials

Date palm biochar-polymer composites: An investigation of electrical, mechanical, thermal and rheological characteristics

Enhanced adsorption of arsenic onto alum sludge modified by calcination

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