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Efects of solution chemistry on arsenic(V) removal by low-cost adsorbents

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Journal of Environmental Sciences 2013年第11期25卷 2291-2298页

作者： Yuru wang daniel c.w.tsang Department of civil and Environmental Engineering Hong Kong Polytechnic University Department of civil and Natural Resources Engineering University of Canterbury

Natural and anthropogenic arsenic （As） contamination of water sources pose serious health concerns, especially for small communities in rural areas. This study assessed the applicability of three industrial byproducts （coal fly ash, lignite, and green waste compost） as the low-cost adsorbents for As（V） removal under various field-relevant conditions （dissolved oxygen, As（V）/Fe ratio, solution pH, and presence of competing species）. The physico-chemical properties of the adsorbents were characterized by XRD, XRF, FT-IR, and NMR analysis. Batch experiments demonstrated that coal fly ash could provide effective As（V） removal （82.1%-95%） because it contained high content of amorphous iron/aluminium hydroxides for As（V） adsorption and dissolvable calcium minerals for calcium arsenate precipitation. However, the addition of lignite and green waste compost was found unfavourable since they hindered the As（V） removal by 10%-42% possibly due to dissolution of organic matter and ternary arsenate-iron-organic matter complexes. On the other hand, higher concentrations of dissolved iron （comparing As（V）/Fe ratios of 1：1 and 1：10） and dissolved oxygen （comparing 0.2 and 6 mg/L） only marginally enhanced the As（V） removal at pH 6 and 8. Thus, addition of dissolved iron, water aeration, or pH adjustment became unnecessary because coal fly ash was able to provide effective As（V） removal under the natural range of geochemical conditions. Moreover, the presence of low levels of background competing （0.8 or 8 mg/L of humic acid, phosphate, and silicate） imposed little influence on As（V） removal, possibly because the high adsorption capacity of coal fly ash was far from exhaustion. These results suggested that coal fly ash was a potentially promising adsorbent that warranted further investigation.

关键词： adsorption arsenic coal fly ash green waste compost lignite

Engineering and microstructure properties of contaminated marine sediments solidified by high content of incinerated sewage sludge ash

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 643-652页

作者： Jiang-Shan Li Yifan Zhou Xin chen Qiming wang Qiang Xue daniel c.w.tsang chi Sun Poon State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China IRSM-cAS/HK PolyU Joint Laboratory on Solid waste Science Hung HomKowloonHong KongChina Hubei Province Key Laboratory of contaminated Sludge and Soil Science and Engineering Wuhan430071China Department of civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Management of incinerated sewage sludge ash(ISSA)and dredged contaminated marine sediments(cMSs)is a great challenge for Hong Kong and other coastal cities due to limited landfilling *** present study investigates the use of high content(20%of sediment by mass)of ISSA in combination with cement/lime for solidification/stabilization(S/S)treatment of cMSs to provide a way to reuse the wastes as construction *** results showed that ISSA being a porous material was able to absorb a large amount of water rendering a more efficient solidification process of the marine sediment which normally had a very high water content(w80%).The S/S treatment improved the engineering properties of the sediment,but reduced the workability,especially for the lime-treated *** can be used to replace ordinary Portland cement(OPc)for better heavy metal immobilization and carbon emission *** hardened sediment samples prepared with 10%of lime and 20%of ISSA could attain a strength of 1.6 MPa after 28 d of *** addition,leaching tests confirmed that there was no environmental risk induced by these stabilized *** formation of hydrated cementitious compounds including calcium silicate hydrate(ceSeH)/calcium aluminate silicate hydrate(c-A-S-H)/hydrocalumite/calcite was mainly responsible for the strength development in the ISSA/lime-treated sediments.

关键词： contaminated marine sediment(cMS) Incinerated sewage sludge ash(ISSA) Solidification/stabilization(S/S) Heavy metals construction material

wood waste biochar promoted anaerobic digestion of food waste:focusing on the characteristics of biochar and microbial community analysis

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Biochar 2022年第1期4卷 152-163页

作者： chao Zhang Rui Yang Meichen Sun Shicheng Zhang Mingjing He daniel c.w.tsang Gang Luo Department of Environmental Science&Engneering Shanghai Key Lab Atmospher Particle Pollution&PreventionFudan UniversityShanghai 200438People’s Republic of China Shanghai Technical Service Platform for Pollution control and Resource Utilization of Organic waste Shanghai 200438People’s Republic of China Shanghai Institute of Pollution control and Ecological Security Shanghai 200092People’s Republic of China Department of civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Research Institute for Future Food The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Anaerobic digestion(AD)has been considered as a promising technique for food waste(Fw)***,the accumulation of volatile fatty acids(VFAs)restricts the stability of anaerobic *** present study investigated the use of biochar produced at different conditions(750℃-30 min,750℃-60 min,750℃-120 min,550℃-60 min,650℃-60 min,850℃-60 min,950℃-60 min)for enhancing the AD of *** experiments showed that all the biochar increased the methane production rates and biochar obtained at 750℃-60 min resulted in the highest enhance-ment by 21.5%.It was further showed surface oxygen-containing functional groups and graphitization degree of biochar were the critical factors for improving methane *** analysis showed that biochar addi-tion formed different microbial communities,and Methanosaeta,Romboutsia,and norank_f_Anaerolineaceae were enriched,which might be correlated with direct interspecies electron transfer(DIET).This research showed biochar could enhance the AD of Fw and also revealed the main characteristics of biochar relating with the enhancement of AD.

关键词： Anaerobic digestion Food waste wood waste biochar Methane production Sustainable waste management

catalytically active interfaces in titania nanorod-supported copper catalysts for cO oxidation

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Nano Research 2020年第2期13卷 533-542页

作者： wasim U.Khan Season S.chen daniel c.w.tsang wey Yang Teoh Xijun Hu Frank L.Y.Lam Alex c.K.Yip Department of chemical and Process Engineering The University of canterbury Christchurch 8041New Zealand Department of civil and Environmental Engineering.The Hong Kong Polytechnic University Hong Kong.China School of chemical Engineering The University of New South WalesSydneyNSW 2052Australia Department of chemical and Biological Engineering The Hong Kong University of Science and TechnologyHong KongChina

One-dimensional titanium dioxide nanorod(TNR)-supported cu catalysts(2.5 wt.%-12.5 wt.%)were synthesized using deposition-precipitation.X-ray photoelectron spectroscopy,temperature programmed reduction and cO chemisorption measurements showed that cu doping over TNR offered metal-support interactions and interfacial active sites that had a profound impact on the catalytic *** role of the cu-TNR interface was investigated by comparing the catalytic activity of cu-TNR catalysts with that of pure cuO nanoparticles in cO *** presence of highly dispersed copper species,a high number of interfacial active sites,cO adsorption capacity and surface/lattice oxygen were found to be responsible for the excellent activity of 7.5cU-TNR(ie,cu loading of 7.5 wt.%on TNR).Moreover,the cu-TNR catalysts followed the Langmuir-Hinshelwood reaction mechanism with 7.5cU-TNR,exhibiting an apparent activation energy of 44.7 kJ/*** TNR-supported cu catalyst gave the highest interfacial catalytic activity in medium-temperature cO oxidation(120-240℃)compared to other commonly used supports,including titanium dioxide nanoparticles(TiO2-P25),silica(SiO2)and alumina(Al20g)in which copper species were nonhomogeneously *** study confirms that medium-temperature cO oxidation is highly sensitive to the morphology and structure of the supporting material.

关键词： supported catalysts nanorod oxygen species interfacial active sites cO oxidation

carbon-negative cement-bonded biochar particleboards

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Biochar 2022年第1期4卷 219-227页

作者： Liang chen Yuying Zhang claudia Labianca Lei wang Shaoqin Ruan chi Sun Poon Yong Sik Ok daniel c.w.tsang Department of civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina State Key Laboratory of clean Energy Utilization Zhejiang UniversityHangzhou 310027China college of civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China Research centre for Resources Engineering Towards carbon Neutrality The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Korea Biochar Research center APRU Sustainable Waste Management Program&Division of Environmental Science and Ecological EngineeringKorea UniversitySeoul 02841Korea

Biochar from bio-waste pyrolysis presents excellent cO_(2) sequestration *** study innovated the design of cement-bonded particleboards utilizing a substantial amount of 50-70 wt.%pre-soaked biochar to render the products *** investigated the roles of biochar in magnesium oxysulfate cement(MOSc)system and demonstrated good mechanical and functional properties of biochar cement *** the presence of biochar,the amounts of hydration products were enriched in the cement systems as illustrated by the thermogravi-metric analyses(TGA)and X-ray diffraction(XRD).we further incorporated supplementary cementitious materials(ScMs)and generated 5 Mg(OH)_(2)⋅MgSO_(4)·7H_(2)O(5-1-7)phase in the MOSc *** a result,our designs of biochar particleboards satisfied the standard requirements for flexural strength(>5.5 MPa)and thickness swelling(char particleboards presented a low thermal conductivity as the biochar pores disrupted thermal bridging within *** illustrated that the high dosage ratio of biochar could significantly offset the cO_(2) emissions of the particleboards(i.e.,carbon-negative)via life cycle *** economic profits could also be accomplished for the biochar *** instance,the 50Bc-MOSc bonded particleboard(with 50 wt.%pre-soaked biochar as aggregate,50 wt.%MOSc as binder)with promising mechanical properties could store 137 kg cO_(2) tonne^(−1) and yield an overall economic profit of 92 to 116 USD m^(−3) depending on the carbon prices in different *** summary,our new designs of carbon-negative biochar particleboards could curtail carbon emissions in the construction materials and promote the realization of carbon neutrality and circular economy.

关键词： Biochar-cement composite carbon neutrality wood waste biochar Magnesium oxysulfate cement climate-positive construction materials

Biochar as construction materials for achieving carbon neutrality

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Biochar 2022年第1期4卷 194-218页

作者： Yuying Zhang Mingjing He Lei wang Jianhua Yan Bin Ma Xiaohong Zhu Yong Sik Ok Viktor Mechtcherine daniel c.w.tsang Department of civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina State Key Laboratory of clean Energy Utilization Zhejiang UniversityHangzhou 310027China Laboratory for waste Management Nuclear Energy and SafetyPaul Scherrer Institute5232 VilligenSwitzerland School of civil Engineering University of LeedsWest YorkshireLeedsUK Korea Biochar Research center APRU Sustainable Waste Management Program&Division of Environmental Science and Ecological EngineeringKorea UniversitySeoulKorea Institute of construction Materials Technische Universität Dresden01062 DresdenGermany Research centre for Resources Engineering towards carbon Neutrality The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Biochar is a waste-derived material that can sequester carbon at a large *** development of low-carbon and sustainable biochar-enhanced construction materials has attracted extensive ***,having a porous nature and highly functionalised surface,can provide nucleation sites for chemical reactions and exhibit compatibility with cement,asphalt,and polymer *** study critically reviewed the state-of-the-art biochar-enhanced construction materials,including biochar-cement composites,biochar-asphalt composites,biochar-plastic composites,*** efficacies and mechanisms of biochar as construction materials were articulated to improve their functional *** critical review highlighted the roles of biochar in cement hydration,surface functional groups of engineered biochar for promoting chemical reactions,and value-added merits of biochar-enhanced construction materials(such as humidity regulation,thermal insulation,noise reduction,air/water purification,electromagnetic shielding,and self-sensing).The major properties of biochar are correlated to the features and functionalities of biochar-enhanced construction *** advances in our understanding of biochar’s roles in various composites can foster the next-generation design of carbon-neutral construction materials.

关键词： Engineered biochar Biomass waste management carbon-negative materials carbon neutrality Supplementary cementitious materials Sustainable construction

Metal Extraction From contaminated Soils by Edds washing Under Edds Excess conditions

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Metal Extraction From Contaminated Soils by Edds Washing Und...

Thermal properties and high-temperature ablation of high-entropy (Ti_(0.25)V_(0.25)Zr_(0.25)Hf_(0.25))B_(2) coating on graphite substrate

第四届粤港澳可持续发展研讨会

作者： Irene M.c.LO Theo c.M.YIP daniel c.w.tsang Hong Kong University of Science and Technology

Biodegradable EDDS(S,S-ethylenediaminedisuccinic acid)is an emerging chelant for enhancing heavy metal extraction from contaminated *** excess is often en- countered at soil *** this study,an empirical model,which utilized the initial metal distribution in soils and a set of parameter values independently determined from sequential ex- traction,was developed for estimating the time-dependent heavy metal extraction by EDDS from multi-metal contaminated *** model simulation provided a satisfactory description of the experimental results of the 7-d extraction kinetics of cu,Zn and Pb in both artificially contaminated and field-contaminated soils under excess EDDS concentration in batch kinetic ***,independent and prior assessment of extraction efficiency would be availa- ble to facilitate the engineering applications of ***,a simple empirical equa- tion using the initial metal distribution was also proposed to estimate the extraction efficiency at equilibrium.

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Journal of Advanced ceramics 2024年第8期13卷 1268-1281页

作者： Ana c.Feltrin daniel Hedman Farid Akhtar Division of Materials Science Lulea University of TechnologyLulea 97187Sweden center for Multidimensional carbon Materials(cMcM) Institute for Basic Science(IBS)Ulsan 44919Republic of Korea

An entropy-stabilized multicomponent ultrahigh-temperature ceramic(UHTc)coating,(Ti_(0.25)V_(0.25)Zr_(0.25)Hf_(0.25))B_(2),on a graphite substrate was in-situ sintered by spark plasma sintering(SPs)from constituent transition metal diboride ***(Ti_(0.25)V_(0.25)Zr_(0.25)Hf_(0.25))B_(2) coating had a hardness of 31.2±2.1 GPa and resisted 36.9 GPa of stress before delamination,as observed at the *** temperature-dependent thermal properties of the multicomponent diboride(Ti_(0.25)V_(0.25)Zr_(0.25)Hf_(0.25))B_(2) were obtained by molecular dynamics(MD)simulations driven by a machine learning force field(MLFF)trained on density functional theory(DFT)*** thermal conductivity,density,heat capacity,and coefficient of thermal expansion obtained by the MD simulations were used in time-dependent thermal stress finite element model(FEM)*** low thermal conductivity(w·m^(-1)·K^(-1))of the multicomponent diboride coupled with its similar coefficient of thermal expansion to that of graphite indicated that stresses of less than 10 GPa were generated at the interface at high temperatures,and therefore,the coating was mechanically resistant to the thermal stress induced during *** experiments at 220℃ showed that the multicomponent diboride coating was resistant to thermal stresses with no visible cracking or *** ablation mechanisms were mechanical denudation and evaporation of B_(2)O_(5) and light V-Ti oxides,which caused a decrease in the mass and thickness of the coating and resulted in mass and linear ablation rates of-0.51 mg·s^(-1) and -1.38μm·s^(-1),respectively,after 60 *** findings demonstrated the thermal and mechanical stability of multicomponent entropy-stabilized diborides as coatings for carbon materials in engineering components under extreme environments.

关键词： entropy-stabilized diborides ultrahigh temperature ceramics molecular dynamics(MD)simulations density functional theory(DFT) ablation properties

Twisted fiber microfluidics:a cutting-edge approach to 3D spiral devices

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Microsystems & Nanoengineering 2024年第1期10卷 193-202页

作者： Shunsuke Kato daniel w.carlson Amy Q.Shen Yuanyuan Guo Department of Electrical Information and Physics EngineeringSchool of EngineeringTohoku UniversityAoba-kuSendai 980-8579 MiyagiJapan Micro/Bio/Nanofluidics Unit Okinawa Institute of Science and TechnologyOnnaKunigami-gun 904-0495 OkinawaJapan Frontier Research Institute for Interdisciplinary Sciences(FRIS) Tohoku UniversityAoba-kuSendai 980-0845 MiyagiJapan Graduate School of Biomedical Engineering Tohoku UniversityAoba-kuSendai 980-8579 MiyagiJapan Department of Physiology Graduate School of MedicineTohoku UniversityAoba-kuSendai 980-8575 MiyagiJapan

The development of 3D spiral microfluidics has opened new avenues for leveraging inertial focusing to analyze small fluid volumes,thereby advancing research across chemical,physical,and biological *** traditional straight microchannels rely solely on inertial lift forces,the novel spiral geometry generates Dean drag forces,eliminating the necessity for external fields in fluid ***,fabricating 3D spiral microfluidics remains a labor-intensive and costly endeavor,hindering its widespread ***,conventional lithographic methods primarily yield 2D planar devices,thereby limiting the selection of materials and geometrical *** address these challenges,this work introduces a streamlined fabrication method for 3D spiral microfluidic devices,employing rotational force within a miniaturized thermal drawing process,termed as *** innovation allows for rapid prototyping of twisted fiber-based microfluidics featuring versatility in material selection and heightened geometric *** validate the performance of these devices,we combined computational modeling with microtomographic particle image velocimetry(uTPiM)to comprehensively characterize the 3D flow *** results corroborate the presence of a steady secondary flow,underscoring the effectiveness of our *** 3D spiral microfluidics platform paves the way for exploring intricate microflow dynamics,with promising applications in areas such as drug delivery,diagnostics,and lab-on-a-chip systems.

关键词： thereby straight twisted