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Journal of Hazardous Materials

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https://www.readbyqxmd.com/read/28806560/tio2-porous-adsorbents-recent-advances-and-novel-applications
#1
REVIEW
Shayan MiarAlipour, Donia Friedmann, Jason Scott, Rose Amal
This article reviews two interrelated areas of research: the first is the use of TiO2-supported adsorbent materials as enhanced heterogeneous photocatalysts and their application to various reactions for organic pollutant removal from air and water; the second is the combination of adsorbent materials with TiO2 photocatalysts which aims to efficiently regenerate adsorbent materials using illumination. By reviewing both areas of research, the following topics are covered; (i) photocatalytic activation of TiO2; (ii) related properties of photocatalytic TiO2; (iii) shortcomings of photocatalytic processes; (iv) preparation methods of composite TiO2/adsorbent materials and their photocatalytic performance; (v) properties of common adsorbents and their applications for pollutant removal from air and water; (vi) adsorbent regeneration methods and their economic and operational issues; (vii) conclusions and future outlooks...
August 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28806559/assessment-of-chemicals-released-in-the-marine-environment-by-dielectric-elastomers-useful-as-active-elements-in-wave-energy-harvesters
#2
Mirela-Fernanda Zaltariov, Adrian Bele, Lavinia Vasiliu, Luiza Gradinaru, Nicoleta Vornicu, Carmen Racles, Maria Cazacu
A series of elastomers, either natural or synthetic (some of them commercial, while others prepared in the laboratory), suitable for use as active elements in devices for wave energy harvesting, were evaluated concerning their behavior and effects on the marine environment. In this aim, the elastomer films, initially evaluated regarding their aspect, structure, surface wettability, and tolerance of microorganisms growth, were immersed in synthetic seawater (SSW) within six months for assessing compounds released...
August 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28802247/effect-of-lead-speciation-on-its-oral-bioaccessibility-in-surface-dust-and-soil-of-electronic-wastes-recycling-sites
#3
Takashi Fujimori, Masaya Taniguchi, Tetsuro Agusa, Kenji Shiota, Masaki Takaoka, Aya Yoshida, Atsushi Terazono, Florencio C Ballesteros, Hidetaka Takigami
We measured bioaccessible lead (Pb) in simulated gastrointestinal fluids containing Pb-contaminated soil or dust from electronic waste (e-waste) recycling sites to assess the risk of Pb ingestion. The physiologically based extraction test (PBET) was used as in vitro bioaccessibility assay. Pb speciation was determined using X-ray absorption spectroscopy. The total Pb concentrations in dusts (n=8) and soils (n=4) were in the range of 1630-131,000 and 239-7800mg/kg, respectively. Metallic Pb, a common component of e-waste, was ubiquitous in the samples...
August 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28802244/detoxification-of-diphenyl-ether-herbicide-lactofen-by-bacillus-sp-za-and-enantioselective-characteristics-of-an-esterase-gene-lace
#4
Jing Zhang, Luyao Lu, Feng Chen, Lingling Chen, Jingang Yin, Xing Huang
A bacterial strain Za capable of degrading diphenyl ether herbicide lactofen was isolated and identified as Bacillus sp. This strain could degrade 94.8% of 50mgL(-1) lactofen after 4days of inoculation in flasks. It was revealed that lactofen was initially hydrolyzed to desethyl lactofen, which was further transformed to acifluorfen, followed by the reduction of the nitro group to yield aminoacifluorfen. The phytotoxicity of the transformed product aminoacifluorfen to maize was decreased significantly compared with the lactofen...
August 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28800567/a-comparative-evaluation-of-anaerobic-dechlorination-of-pcb-118-and-aroclor-1254-in-sediment-microcosms-from-three-pcb-impacted-environments
#5
Devrim Kaya, Ipek Imamoglu, F Dilek Sanin, Kevin R Sowers
Aroclor 1254 (A1254) is the most toxic commercial PCB mixture produced, primarily due to its relatively high concentrations of dioxin-like congeners. This study demonstrates a comparative evaluation of dechlorination of A1254 and PCB-118 by indigenous organohalide respiring bacteria enriched from three PCB impacted sites: Grasse River (GR), NY; Fox River (FR), WI; and Baltimore Harbor (BH), MD. PCB-118 dechlorination rates in GR, BH, and FR was 0.0308, 0.015, and 0.0006 Cl(-)/biphenyl/day, respectively. A1254 dechlorination rates in GR, FR, and BH were 0...
August 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28800565/in-vitro-toxicity-evaluation-of-new-silane-modified-clays-and-the-migration-extract-from-a-derived-polymer-clay-nanocomposite-intended-to-food-packaging-applications
#6
Sara Maisanaba, Remedios Guzmán-Guillén, María Puerto, Daniel Gutiérrez-Praena, Natalia Ortuño, Ángeles Jos
The clay montmorillonite (Mt) is among the nanofillers more frequently used for food packaging applications. The organomodification of clays with different modifiers, such as silanes, is an important step in the preparation of improved polymer/clay materials known as nanocomposites. However, the toxicological data about these nanofillers is still scarce. In the present study, an in vitro toxicological evaluation in Caco-2 cells of two silane-modified clays based on Mt, Clay3 and Clay4 (0-250μg/ml), was performed...
August 2, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28800564/interplay-between-flow-and-bioturbation-enhances-metal-efflux-from-low-permeability-sediments
#7
Minwei Xie, Ning Wang, Jean-François Gaillard, Aaron I Packman
Understanding the interplay effects between processes such as hydrodynamic forcing, sediment resuspension, and bioturbation is key to assessment of contaminated sediments. In the current study, effects of hydrodynamic forcing, sediment resuspension, and bioturbation by the marine polychaete Nereis virens were evaluated both independently and together in a six-month flume experiment. The results show that hydrodynamic forcing without resuspension or worm action slightly enhanced efflux of dissolved Cu to the water column, sediment resuspension released considerable amounts of dissolved Cu, and interactions between hydrodynamics and worm burrowing further enhanced Cu efflux...
August 2, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28800563/a-novel-polymer-inclusion-membrane-based-method-for-continuous-clean-up-of-thiocyanate-from-gold-mine-tailings-water
#8
Youngsoo Cho, Robert W Cattrall, Spas D Kolev
Thiocyanate is present in gold mine tailings waters in concentrations up to 1000mgL(-1) and this has a serious environmental impact by not allowing water reuse in the flotation of gold ore. This significantly increases the consumption of fresh water and the amount of wastewater discharged in tailings dams. At the same time thiocyanate in tailings waters often leads to groundwater contamination. A novel continuous membrane-based method for the complete clean-up of thiocyanate in concentrations as high as 1000mgL(-1) from its aqueous solutions has been developed...
August 2, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28797943/adsorption-study-of-selenium-ions-from-aqueous-solutions-using-mgo-nanosheets-synthesized-by-ultrasonic-method
#9
Wenwen Cui, Ping Li, Zheming Wang, Shili Zheng, Yi Zhang
MgO nanosheets with thickness ranges of 3-10 molecule layers and high specific area (166.44m(2)g(-1)) were successfully fabricated by an ultrasound-assisted exfoliation method and used as adsorbent for the removal of both selenite (Se(IV)) and selenate (Se(VI)) from aqueous solutions. The resulting MgO nanosheets displayed high maximum adsorption capacities of 103.52 and 10.28mgg(-1) for Se(IV) and Se(VI), respectively. ATR-FTIR and XPS spectroscopic results suggested that both Se(IV) and Se(VI) formed inner-sphere surface complexes on MgO nanosheets under the present experimental conditions...
August 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28797941/comprehensive-in-vitro-and-in-vivo-risk-assessments-of-chitosan-microparticles-using-human-epithelial-cells-and-caenorhabditis-elegans
#10
Zhengxin Ma, Alejandro Garrido-Maestu, Choonghee Lee, Jungwhan Chon, Daehee Jeong, Yiren Yue, Kidon Sung, Yeonhwa Park, Kwangcheol Casey Jeong
The safety of using nano- and microparticles is a developing concern. In this study, we conducted risk assessments of chitosan microparticles (CMs) using in vitro human epithelial cell lines and in vivo animal model, Caenorhabditis elegans. After engineering of various CMs, we screened four CMs based on antimicrobial activity, which is a potential usage for disease treatment caused by multidrug resistant bacteria, and evaluated for risk assessments. CMs, with strong antimicrobial activity, and inorganic nanoparticles (SiO2, TiO2, and ZnO) did not cause toxicity in human cells measured by cell membrane integrity, mitochondria activity, and reactive oxygen species concentration...
August 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28800566/highly-selective-adsorption-of-co-over-co2-in-a-cu-i-chelated-porous-organic-polymer
#11
Jung Woon Yoon, Tae-Ung Yoon, Eun-Jung Kim, Ah-Reum Kim, Tae-Sung Jung, Sang-Sup Han, Youn-Sang Bae
Cu(I) species were successfully chelated to nitrogen atoms in a nitrogen-rich porous organic polymer (SNW-1) by mixing with a CuCl solution (Scheme 1). Although pristine SNW-1 adsorbs CO2 better than CO, Cu(I)-incorporated SNW-1 (nCu(I)@SNW-1) shows selective CO adsorption over CO2 because of the π-complexation of CO with Cu(I). To the best of our knowledge, this is the first CO/CO2 selectivity observed for POP-based materials. 1.3Cu(I)@SNW-1 exhibits high CO/CO2 selectivity (23) at 1bar and a large CO working capacity (0...
July 31, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28797942/high-calcium-fly-ash-geopolymer-stabilized-lateritic-soil-and-granulated-blast-furnace-slag-blends-as-a-pavement-base-material
#12
Itthikorn Phummiphan, Suksun Horpibulsuk, Runglawan Rachan, Arul Arulrajah, Shui-Long Shen, Prinya Chindaprasirt
Granulated Blast Furnace Slag (GBFS) was used as a replacement material in marginal lateritic soil (LS) while class C Fly Ash (FA) was used as a precursor for the geopolymerization process to develop a low-carbon pavement base material at ambient temperature. Unconfined Compression Strength (UCS) tests were performed to investigate the strength development of geopolymer stabilized LS/GBFS blends. Scanning Electron Microscopy and X-ray Diffraction analysis were undertaken to examine the role of the various influencing factors on UCS development...
July 31, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28780437/elemental-mercury-removal-from-flue-gas-by-cofe2o4-catalyzed-peroxymonosulfate
#13
Yi Zhao, Xiaoying Ma, Peiyao Xu, Han Wang, Yongchun Liu, Anen He
A magnetic cobalt ferrite (CoFe2O4) catalyst was prepared by sol-gel method, and characterized by a X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Brunauer-Emmett-Teller (BET) and hysteresis loop method. The chemical states on surface of the fresh and spent catalysts were analyzed by a X-ray photoelectron spectroscopy (XPS). The experiments of elemental mercury (Hg(0)) removal from flue gas were conducted in a laboratory scale using activated peroxymonosulfate (PMS) catalyzed by CoFe2O4, and the effects of the dosage of catalyst, the concentration of PMS, initial solution pH and reaction temperature on mercury removal efficiency were investigated...
July 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28780436/particle-emission-rates-during-electrostatic-spray-deposition-of-tio2-nanoparticle-based-photoactive-coating
#14
Antti J Koivisto, Alexander C Ø Jensen, Kirsten I Kling, Jens Kling, Hans Christian Budtz, Ismo K Koponen, Ilse Tuinman, Tareq Hussein, Keld A Jensen, Asger Nørgaard, Marcus Levin
Here, we studied the particle release rate during Electrostatic spray deposition of anatase-(TiO2)-based photoactive coating onto tiles and wallpaper using a commercially available electrostatic spray device. Spraying was performed in a 20.3m(3) test chamber while measuring concentrations of 5.6nm to 31μm-size particles and volatile organic compounds (VOC), as well as particle deposition onto room surfaces and on the spray gun user hand. The particle emission and deposition rates were quantified using aerosol mass balance modelling...
July 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28780435/synthesis-and-characterization-of-carboxylic-cation-exchange-bio-resin-for-heavy-metal-remediation
#15
Vihangraj V Kulkarni, Animes Kumar Golder, Pranab Kumar Ghosh
A new carboxylic bio-resin was synthesized from raw arecanut husk through mercerization and ethylenediaminetetraacetic dianhydride (EDTAD) carboxylation. The synthesized bio-resin was characterized using thermogravimetric analysis, field emission scanning electron microscopy, proximate & ultimate analyses, mass percent gain/loss, potentiometric titrations, and Fourier transform infrared spectroscopy. Mercerization extracted lignin from the vesicles on the husk and EDTAD was ridged in to, through an acylation reaction in dimethylformamide media...
July 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28780434/preparation-of-amino-functionalized-fe3o4-msio2-core-shell-magnetic-nanoparticles-and-their-application-for-aqueous-fe-3-removal
#16
Cheng Meng, Wang Zhikun, Lv Qiang, Li Chunling, Sun Shuangqing, Hu Songqing
Fe3O4 nanoparticle with magnetic properties and nanoscale features has provoked wide research interest and great potential application. Herein, a modified Stober and template-removing method was adopted to prepare magnetic mesoporous silica nanoparticles (MSNs), comprising a Fe3O4 core and a mesoporous silica shell. The shell was functionalized by amino-groups with tunable removal efficiency for aqueous heavy metals ions. Structural and magnetic properties were characterized by XRD, SEM, FT-IR, vibrating sample magnetometer (VSM) and BET (Brunauer-Emmertt-Teller) techniques...
July 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28777963/biochar-accelerates-microbial-reductive-debromination-of-2-2-4-4-tetrabromodiphenyl-ether-bde-47-in-anaerobic-mangrove-sediments
#17
Juan Chen, Chao Wang, Ying Pan, Shazia Shyla Farzana, Nora Fung-Yee Tam
A common congener of polybrominated diphenyl ethers, 2,2',4,4'-tetrabromodiphenyl ether (BDE-47), is a prevalent, persistent and toxic pollutant. It could be removed by reduction debromination by microorganisms but the rate is often slow. The study hypothesized that spent mushroom substrate derived biochar amendment could accelerate the microbial reductive debromination of BDE-47 in anaerobic mangrove sediment slurries and evaluated the mechanisms behind. At the end of 20-week experiment, percentages of residual BDE-47 in slurries amended with biochar were significantly lower but debromination products were higher than those without biochar...
July 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28777962/effect-of-graphene-oxide-on-copper-stress-in-lemna-minor-l-evaluating-growth-biochemical-responses-and-nutrient-uptake
#18
Changwei Hu, Lei Liu, Xiuling Li, Yundi Xu, Zhigang Ge, Yongjun Zhao
The wide application and unique properties of graphene oxide (GO) make it to interact with other pollutants and subsequently alter their behavior and toxicity. We evaluated the influences of GO at different concentrations (1 and 5mg/L) on copper (Cu) stress in duckweed (Lemna minor L.) GO below a concentration of 5mg/L showed no adverse effects on L. minor. The addition of Cu above 10μM represented a stress condition, which was evidenced by various parameters such as frond number, percent inhibition of growth rate (Ir), total chlorophyll content, dry weight, superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD)...
July 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28787657/getters-for-improved-technetium-containment-in-cementitious-waste-forms
#19
R Matthew Asmussen, Carolyn I Pearce, Brian W Miller, Amanda R Lawter, James J Neeway, Wayne W Lukens, Mark E Bowden, Micah A Miller, Edgar C Buck, R Jeffery Serne, Nikolla P Qafoku
A cementitious waste form, Cast Stone, is a possible candidate technology for the immobilization of low activity nuclear waste (LAW) at the Hanford site. This work focuses on the addition of getter materials to Cast Stone that can sequester Tc from the LAW, and in turn, lower Tc release from the Cast Stone. Two getters which produce different products upon sequestering Tc from LAW were tested: Sn(II) apatite (Sn-A) that removes Tc as a Tc(IV)-oxide and potassium metal sulfide (KMS-2) that removes Tc as a Tc(IV)-sulfide species, allowing for a comparison of stability of the form of Tc upon entering the waste form...
July 26, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28806557/a-highly-sensitive-and-selective-aptamer-based-colorimetric-sensor-for-the-rapid-detection-of-pcb-77
#20
Ruojie Cheng, Siyao Liu, Huijie Shi, Guohua Zhao
A highly sensitive, specific and simple colorimetric sensor based on aptamer was established for the detection of polychlorinated biphenyls (PCB 77). The use of unmodified gold nanoparticles as a colorimetric probe for aptamer sensors enabled the highly sensitive and selective detection of polychlorinated biphenyls (PCB 77). A linear range of 0.5nM to 900nM was obtained for the colorimetric assay with a minimum detection limit of 0.05nM. In addition, by the methods of circular dichroism, UV and naked eyes, we found that the 35 base fragments retained after cutting 5 bases from the 5 'end of aptamer plays the most significant role in the PCB 77 specific recognition process...
July 25, 2017: Journal of Hazardous Materials
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