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Journal of Hazardous Materials

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https://www.readbyqxmd.com/read/28918290/in-situ-arsenic-oxidation-and-sorption-by-a-fe-mn-binary-oxide-waste-in-soil
#1
Clare M McCann, Caroline L Peacock, Karen A Hudson-Edwards, Thomas Shrimpton, Neil D Gray, Karen L Johnson
The ability of a Fe-Mn binary oxide waste to adsorb arsenic (As) in a historically contaminated soil was investigated. Initial laboratory sorption experiments indicated that arsenite [As(III)] was oxidized to arsenate [As(V)] by the Mn oxide component, with concurrent As(V) sorption to the Fe oxide. The binary oxide waste had As(III) and As(V) adsorption capacities of 70mgg(-1) and 32mgg(-1) respectively. X-ray Absorption Near-Edge Structure and Extended X-ray Absorption Fine Structure at the As K-edge confirmed that all binary oxide waste surface complexes were As(V) sorbed by mononuclear bidentate corner-sharing, with 2 Fe at ∼3...
September 14, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28918293/insight-into-the-h2s-selective-catalytic-oxidation-performance-on-well-mixed-ce-containing-rare-earth-catalysts-derived-from-mgalce-layered-double-hydroxides
#2
Fenglian Zhang, Xin Zhang, Zhengping Hao, Guoxia Jiang, Hongling Yang, Siqiu Qu
A series of well-mixed Ce-containing MgAlCe rare earth catalysts derived from layered double hydroxides were synthesized and tested for H2S selective catalytic oxidation. Particularly, no chemisorption O-vacancies but intrinsic defect sites were present on catalyst surface. Significantly, the catalysts exhibited excellent catalytic activity, reasonable durability, and outstanding sulfur selectivity (100%) at relatively low temperatures. Furthermore, the catalyst followed a step-wise mechanism, and the catalyst deactivation was due mainly to the slower oxidation rate of Ce(3+) to Ce(4+) by O2 as compared to the reduction rate of Ce(4+) to Ce(3+) by H2S...
September 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28918292/nanoscaled-gold-and-silver-simultaneous-removal-and-transformation-to-functional-materials
#3
Youyi Xia, Lin Sun, Hongping Xiao
Based on an "acid-assisted cool welding" technology which was realized by virtue of the freezing process in the presence of acid, nanoscaled gold (Au) and silver (Ag) from wastewater could be removed very facilely and efficiently. The technology was independence of the freezing temperature, size as well as shape of those nanoscaled units. Besides, some functional materials like porous nanostructures with highly and stably catalytic activity could be also obtained during the removal. Our research not only provided a new method to remove nanoscaled Ag or Au from wastewater, but also built up a unique route to transform those nano-units into functional materials simultaneously...
September 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28898864/what-happens-with-organic-micropollutants-during-uv-disinfection-in-wwtps-a-global-perspective-from-laboratory-to-full-scale
#4
L Paredes, F Omil, J M Lema, M Carballa
The phototransformation of 18 organic micropollutants (OMPs) commonly detected in wastewater treatment plant (WWTP) effluents was examined attempting to explain their fate during UV disinfection in WWTPs. For this purpose, a lab-scale UV reactor (lamp emitting at 254nm) was used to study the influence of the operational conditions (UV dose, temperature and water matrix) on OMPs abatement and disinfection efficiency. Chemical properties of OMPs and the quality of treated effluent were identified as key factors affecting the phototransformation rate of these compounds...
September 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28898863/efficient-promotion-of-charge-transfer-and-separation-in-hydrogenated-tio2-wo3-with-rich-surface-oxygen-vacancies-for-photodecomposition-of-gaseous-toluene
#5
Juan-Juan Li, Bo Weng, Song-Cai Cai, Jing Chen, Hong-Peng Jia, Yi-Jun Xu
Oxygen-deficient TiO2/WO3 constructed via the controllable temperature of hydrogen annealing is designed in view of combining the broad visible spectrum absorption with the prominent coupled semiconductor properties. Surface lattice disorder of TiO2/WO3 arises at hydrogen annealing temperature of 200 and 300°C, while critical phase transition from TiO2/WO3 to TiO2/WO2.9 occurs at 400°C, both of which can introduce oxygen vacancies. The hydrogenated TiO2/WO3 with rich surface-oxygen-vacancies exhibits much higher photocatalytic activity for decomposition of gaseous toluene than pristine TiO2/WO3 under visible-light illumination (λ>420nm)...
September 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28898860/direct-detection-of-the-triphenylpyrylium-derived-short-lived-intermediates-in-the-photocatalyzed-degradation-of-acetaminophen-acetamiprid-caffeine-and-carbamazepine
#6
R Martinez-Haya, J Gomis, A Arques, A M Amat, M A Miranda, M L Marin
Advanced oxidation processes are useful methodologies to accomplish abatement of contaminants; however, elucidation of the reaction mechanisms is hampered by the difficult detection of the short-lived primary key species involved in the photocatalytic processes. Nevertheless, herein the combined use of an organic photocatalyst such as triphenylpyrylium (TPP(+)) and photophysical techniques based on emission and absorption spectroscopy allowed monitoring the photocatalyst-derived short-lived intermediates. This methodology has been applied to the photocatalyzed degradation of different pollutants, such as acetaminophen, acetamiprid, caffeine and carbamazepine...
September 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28917199/enhanced-phosphorus-and-ciprofloxacin-removal-in-a-modified-baf-system-by-configuring-fe-c-micro-electrolysis-investigation-on-pollutants-removal-and-degradation-mechanisms
#7
Longlong Zhang, Qinyan Yue, Kunlun Yang, Pin Zhao, Baoyu Gao
A modified biological aerated filter (BAF) system configured Fe-C micro electrolysis was applied to enhance phosphorus and ciprofloxacin (CIP) removal. A novel sludge ceramic and sintering ferric-carbon ceramic (SFC) were separately packed into a lab-scale BAF and Fe-C micro electrolysis reactor. The BAF and Fe-C micro electrolysis coupled system was operated about 230days. The enhancement of phosphorus and ciprofloxacin removals by Fe-C micro electrolysis, the degradation mechanisms of CIP and the variations of microbial population were investigated...
September 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28892795/uniform-dispersion-of-cobalt-nanoparticles-over-nonporous-tio2-with-low-activation-energy-for-magnesium-sulfate-recovery-in-a-novel-magnesia-based-desulfurization-process
#8
Lidong Wang, Tieyue Qi, Juan Wang, Shihan Zhang, Huining Xiao, Yongliang Ma
The forced oxidation of magnesium sulfite (MgSO3) aims to not only reclaim the by-product in the magnesia desulfurization, but also lower the risk of secondary pollution. The non-porous titanium dioxide nanoparticle was used as a support to prepare the cobalt catalyst (Co-TiO2) in order to expedite the oxidation rate. This fabricated Co-TiO2 was characterized by inductively coupled plasma optical emission spectroscopy (ICP-OES), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and energy dispersive spectroscopy (EDS) to figure out its catalytic mechanism...
September 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28917200/improved-visible-light-activities-for-degrading-pollutants-on-tio2-g-c3n4-nanocomposites-by-decorating-spr-au-nanoparticles-and-2-4-dichlorophenol-decomposition-path
#9
Amir Zada, Yang Qu, Sharafat Ali, Ning Sun, Hongwei Lu, Rui Yan, Xuliang Zhang, Liqiang Jing
It has been clearly demonstrated that the visible-light photocatalytic activities of g-C3N4 (CN) for degrading 2,4-dichlorophenol (2,4-DCP) and bisphenol A (BPA) could be improved by fabricating nanocomposites with a proper amount of nanocrystalline anatase TiO2. Interestingly, the visible-light activities of the amount-optimized nanocomposite could be further improved after decorating Au nanoparticles, with 5.11- and 3.1-time improvement respectively for 2,4-DCP and BPA compared to that of CN, even much higher than that of P25 TiO2 under UV-vis irradiation...
September 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28919429/electrochemical-synthesis-of-ferrate-vi-using-sponge-iron-anode-and-oxidative-transformations-of-antibiotic-and-pesticide
#10
Xuhui Sun, Kexin Zu, He Liang, Lin Sun, Lingyun Zhang, Chuanyi Wang, Virender K Sharma
Passivation of anode is a main challenge in the electrochemical synthesis of ferrate(VI) (Fe(VI)O4(2-), Fe(VI)). A series of electrochemical approaches were employed including polarization curve, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS) to analyze the physicochemical processes involved in electrochemical synthesis of Fe(VI) using sponge iron and cast iron anodes. The results demonstrate that the sponge iron anode achieved higher yield of Fe(VI) compared to grey cast iron anode. The optimum condition to generate Fe(VI) using sponge iron was 35-50°C and 30mA/cm(2)...
September 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28898861/removal-and-metabolism-of-triclosan-by-three-different-microalgal-species-in-aquatic-environment
#11
Shujuan Wang, Karen Poon, Zongwei Cai
Triclosan, an antimicrobial additive widely used in personal care products, has caused the contamination of various aquatic environment. Biodegradation was proved to play a vital role in the treatment of triclosan in wastewater. However, there is limited information about the metabolic pathway. In this study, three common freshwater microalgae including Chlorella pyrenoidosa (C. pyrenoidosa), Desmodesmus sp., and Scenedesmus obliquus (S. obliquus) were applied to remove and biodegrade triclosan in aqueous culture medium...
September 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28892799/a-small-scale-experimental-study-on-the-initial-burst-and-the-heterogeneous-evolution-process-before-co2-bleve
#12
Mingzhi Li, Zhenyi Liu, Yi Zhou, Yao Zhao, Xuan Li, Deping Zhang
The sudden rupture of a vessel containing liquefied carbon dioxide (CO2) can generate a boiling liquid expanding vapor cloud explosion (BLEVE). The entire evolution process and mechanism of CO2 BLEVE has not been fully characterized, and its influencing factors have not been systematically examined. In this study, the ejection process and microphase change process in the vessel were recorded by a high-speed camera. Within 20ms, the pressure peaks surpassed the initial values and were considered to be the initiation of a sequence that generated a CO2 BLEVE under certain conditions...
September 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28886568/synergistic-degradation-of-pyrene-by-five-culturable-bacteria-in-a-mangrove-sediment-derived-bacterial-consortium
#13
Pagakrong Wanapaisan, Natthariga Laothamteep, Felipe Vejarano, Joydeep Chakraborty, Masaki Shintani, Chanokporn Muangchinda, Tomomi Morita, Chiho Suzuki-Minakuchi, Kengo Inoue, Hideaki Nojiri, Onruthai Pinyakong
A pyrene-degrading microbial consortium was obtained after enrichment with mangrove sediment collected from Thailand. Five cultivable bacteria (Mycobacterium spp. PO1 and PO2, Novosphingobium pentaromativorans PY1, Ochrobactrum sp. PW1, and Bacillus sp. FW1) were successfully isolated from the consortium. Draft genomes of them showed that two different morphotypes of Mycobacterium (PO1 and PO2), possessed a complete gene set for pyrene degradation. PY1 contained genes for phthalate assimilation via protocatechuate, a central intermediate, by meta-cleavage pathway, and PW1 possessed genes for protocatechuate degradation via ortho-cleavage pathway...
September 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28886566/textile-dye-biodecolourization-and-ammonium-removal-over-nitrite-in-aerobic-granular-sludge-sequencing-batch-reactors
#14
M Sarvajith, G Kiran Kumar Reddy, Y V Nancharaiah
Biodecolourization of azo dye and removal of ammonium by aerobic granular sludge (AGS) was investigated under different growth conditions. AGS not previously exposed to azo dye was able to effectively decolourize azo dye under anaerobic and microaerophilic conditions. Azo dye, total organic carbon and ammoniacal nitrogen removal efficiencies of 89-100%, 79-95% and 92-100%, respectively, were achieved in the AGS reactor operated for 80days under microaerophilic conditions. Removal of carbon, nitrogen and phosphorus was not impacted by azo dye loading...
September 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28910653/biobased-polyelectrolyte-multilayer-coated-hollow-mesoporous-silica-as-a-green-flame-retardant-for-epoxy-resin
#15
Shu-Dong Jiang, Gang Tang, Junmin Chen, Zheng-Qi Huang, Yuan Hu
Here, we describe a multifunctional biobased polyelectrolyte multilayer-coated hollow mesoporous silica (HM-SiO2@CS@PCL) as a green flame retardant through layer-by-layer assembly using hollow mesoporous silica (HM-SiO2), chitosan (CS) and phosphorylated cellulose (PCL). The electrostatic interactions deposited the CS/PCL coating on the surface of HM-SiO2. Subsequently, this multifunctional flame retardant was used to enhance thermal properties and flame retardancy of epoxy resin. The addition of HM-SiO2@CS@PCL to the epoxy resin thermally destabilized the epoxy resin composite, but generated a higher char yield...
September 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28903093/chlorination-chloramination-and-ozonation-of-carbamazepine-enhance-cytotoxicity-and-genotoxicity-multi-endpoint-evaluation-and-identification-of-its-genotoxic-transformation-products
#16
Yingnan Han, Mei Ma, Na Li, Rui Hou, Chao Huang, Yoshimitsu Oda, Zijian Wang
Investigations have focused on the removal and transformation of pharmaceuticals during drinking water and wastewater treatment. In the present study, we investigated for the first time the changes of the cytotoxicity and genotoxicity based on different modes of action (MoAs) during chlorination, chloramination and ozonation processes of the anti-epileptic drug carbamazepine (CBZ). The results illustrated that ozonation enhanced the cytotoxicity and the chromosome damage effects on CHO-K1 cells detected by cytokinesis-block micronucleus (CBMN) assay based on high-content screening technique, though ozonation showed the highest removal efficiency for CBZ...
September 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28898859/antibacterial-clay-against-gram-negative-antibiotic-resistant-bacteria
#17
Luis Zarate-Reyes, Cynthia Lopez-Pacheco, Antonio Nieto-Camacho, Eduardo Palacios, Virginia Gómez-Vidales, Stephan Kaufhold, Kristian Ufer, Eduardo García Zepeda, Javiera Cervini-Silva
Antibiotic resistant bacteria persist throughout the world because they have evolved the ability to express various defense mechanisms to cope with antibiotics and the immune system; thus, low-cost strategies for the treatment of these bacteria are needed, such as the usage of environmental minerals. This paper reports the antimicrobial properties of a clay collected from Brunnenberg, Germany, that is composed of ferroan saponite with admixtures of quartz, feldspar and calcite as well as exposed or hidden (layered at inner regions) nano Fe(0)...
September 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28898858/microbial-community-structure-in-aerobic-and-fluffy-granules-formed-in-a-sequencing-batch-reactor-supplied-with-4-chlorophenol-at-different-settling-times
#18
Selene Gómez-Acata, Miguel Vital-Jácome, Mariana Vivian Pérez-Sandoval, Yendi E Navarro-Noya, Frederic Thalasso, Marco Luna-Guido, Eloy Conde-Barajas, Luc Dendooven
Toxic compounds, such as 4-chlorophenol (4-CP), which is a common pollutant in wastewater, are removed efficiently from sequencing batch reactors (SBRs) by microorganisms. The bacterial community in aerobic granules formed during the removal of 4-CP in a SBR was monitored for 63days. The SBR reactor was operated with a constant filling and withdrawal time of 7 and 8min and decreasing settling time (30, 5, 3 and 2min) to induce the formation of aerobic granules. During the acclimation period lasting 15days (30min settling time) had a strong effect on the bacterial community...
September 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28892798/a-novel-method-for-the-sequential-removal-and-separation-of-multiple-heavy-metals-from-wastewater
#19
Li Fang, Liang Li, Zan Qu, Haomiao Xu, Jianfang Xu, Naiqiang Yan
A novel method was developed and applied for the treatment of simulated wastewater containing multiple heavy metals. A sorbent of ZnS nanocrystals (NCs) was synthesized and showed extraordinary performance for the removal of Hg(2+), Cu(2+), Pb(2+) and Cd(2+). The removal efficiencies of Hg(2+), Cu(2+), Pb(2+) and Cd(2+) were 99.9%, 99.9%, 90.8% and 66.3%, respectively. Meanwhile, it was determined that solubility product (Ksp) of heavy metal sulfides was closely related to adsorption selectivity of various heavy metals on the sorbent...
September 1, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28892796/a-solid-composite-microbial-inoculant-for-the-simultaneous-removal-of-volatile-organic-sulfide-compounds-preparation-characterization-and-its-bioaugmentation-of-a-biotrickling-filter
#20
Dong-Zhi Chen, Xiang-Yu Zhao, Xiao-Ping Miao, Jing Chen, Jie-Xu Ye, Zhuo-Wei Cheng, Shi-Han Zhang, Jian-Meng Chen
Volatile organic sulfide compounds (VOSCs) are usually resistant to biodegradation, thereby limiting the performance of traditional biotechnology dealing with waste gas containing such pollutants especially in mixture. In this study, a solid composite microbial inoculant (SCMI) was prepared to remove dimethyl sulfide (DMS) and propanethiol (PT). Given that the DMS degradation activity of Alcaligenes sp. SY1 is inducible and the PT-degradation activity of Pseudomonas putida S-1 is constitutive, different strategies are designed for cell cultivation to obtain high VOSC removal rates of SCMI...
September 1, 2017: Journal of Hazardous Materials
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