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Journal of Hazardous Materials

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https://www.readbyqxmd.com/read/30029087/selective-metal-cation-concentration-during-the-solidification-of-stainless-steel-eaf-dust-and-slag-mixtures-from-high-temperatures-for-increased-cr-recovery
#1
Gibeom Kim, Il Sohn
The selective concentration of valuable metal cations in Fet O-Cr2 O3 -NiO-MnO-containing stainless steel dust has been studied. The hazardous metal cations Fe, Cr, Ni and Mn could be locally concentrated during the solidification of a molten stainless steel slag and dust mixture from high temperatures by controlling the primary crystalline spinel phase. The nucleation and growth of the primary spinel phase could be controlled by varying the slag to dust mixing ratio and the cooling temperature. Significant redistribution between the primary spinel and amorphous phases could be observed, where the contents of Cr and Mn in the crystalline phase could be increased up to 40% and 10%, respectively, from their initial contents of 5% and 4% in the melt...
July 16, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014932/food-influence-on-lead-relative-bioavailability-in-contaminated-soils-mechanisms-and-health-implications
#2
Hong-Bo Li, Meng-Ya Li, Di Zhao, Ya-Guang Zhu, Jie Li, Albert L Juhasz, Xin-Yi Cui, Jun Luo, Lena Q Ma
To determine the effects of dietary constituents on soil Pb oral bioavailability, Pb relative bioavailability (RBA) in 3 soils contaminated by zinc smelting (ZS), wire-rope production (WR), and metal mining (MM) was measured under fasted and fed states with 9 foods. Under fasted state, Pb-RBA was 84.4 ± 10.3, 82.6 ± 4.70, and 32.3 ± 1.10% for ZS, WR, and MM soils; however, it decreased by 1.3-3.5 fold to 23.9-58.8, 25.6-49.9, and 14.8-24.2% under fed states with foods excluding Pb-RBA with egg in WR soil (97...
July 12, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014910/preparation-of-the-cnts-ag-ito-electrode-with-high-electro-catalytic-activity-for-2-chlorophenol-degradation-and-the-potential-risks-from-intermediates
#3
Haiyang Liu, Zhaocheng Zhang, Miao Ren, Jiunian Guan, Nan Lu, Jiao Qu, Xing Yuan, Ya-Nan Zhang
A novel carbon nanotubes (CNTs)/agarose (AG)/ITO electrode with high electro-catalytic activity was prepared using a simple sol-gel method. Characterization results showed that the prepared CNTs/AG membrane, coated on the ITO conductive glass, was consisted of C and O. The electro-catalytic degradation for 2-chlorophenol (2-CP) and the influence factors were investigated. The results meant that electro-catalytic degradation for 2-CP was highly dependent on pH, bias voltage, and catalyst dosage. At pH 2, 4 V bias voltage, and 5 wt% CNTs dosage, the electro-catalytic efficiency of CNTs/AG/ITO electrode for 2-CP (20 mg/L) achieved 98% within 180 min...
July 10, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014906/an-innovative-wastewater-treatment-technology-based-on-uasb-and-ifas-for-cost-efficient-macro-and-micropollutant-removal
#4
A Arias, T Alvarino, T Allegue, S Suárez, J M Garrido, F Omil
An innovative process based on the combination of a UASB reactor and an IFAS system is proposed in order to combine different redox conditions and biomass conformations to promote a high microbial diversity. The objective of this configuration is to enhance the biological removal of organic micropollutants (OMPs) as well as to achieve the abatement of nitrogen by using the dissolved methane as an inexpensive electron donor. Results showed high removals of COD (93%) and dissolved methane present in the UASB effluent (up to 85%) was biodegraded by a consortium of aerobic methanotrophs and heterotrophic denitrifiers...
July 10, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30016761/enhanced-degradation-of-trichloroethylene-in-oxidative-environment-by-nzvi-pda-functionalized-rgo-catalyst
#5
Mengbin Gu, Qian Sui, Usman Farooq, Xiang Zhang, Zhaofu Qiu, Shuguang Lyu
Nano zero-valent iron (nZVI) particles with higher reactivity have been recognized as more efficient catalysts than Fe(II) for the groundwater remediation. The rapid emergence of novel catalyst supports efficiently prevent the rapid aggregation of nZVI and further improve catalytic reactivity. However, the lack of ability to avoid the potential oxidation of bare nZVI-support structure in air environment hinders its wider application in the actual contaminated sites. In this study, nZVI on reduced graphene oxide (rGO) functionalized by polydopamine (PDA) (nZVI-PDA@rGO) was synthesized successfully and applied into sodium persulfate (SPS), potassium monopersulfate (PMS) and H2 O2 oxidative environments to remove trichloroethylene (TCE)...
July 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014919/low-cost-iron-doped-catalyst-for-phenol-degradation-by-heterogeneous-fenton
#6
Tarcísio W Leal, Luís A Lourenço, Heloísa de L Brandão, Adriano da Silva, Selene M A Guelli U de Souza, Antônio A Ulson de Souza
The aim of this work was to study the feasibility of textile sludge as a precursor to prepare catalysts for catalytic wet peroxide oxidation (CWPO) by chemical and thermal treatments. Textile sludge was characterized by physical-chemical and metal composition analyses. The chemical activation was evaluated using iron sulfate and the thermal treatment was carried out at 720 °C in a vacuum pyrolysis reactor. Two catalysts with iron contents of 1.5% and 5.6% were selected. Process parameters influence on CWPO of phenol were evaluated and a maximum removal of phenol and TOC was observed at pH 3 and 60 °C, using 3 g L-1 of the catalyst containing 5...
July 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014913/taurine-provides-a-time-dependent-amelioration-of-the-brain-damage-induced-by-%C3%AE-irradiation-in-rats
#7
Engy F El-Maraghi, Kamal I Abdel-Fattah, Saeed M Soliman, Wael M El-Sayed
Exposure to ionizing radiation (IR) is inevitable since over 80% of total average exposure comes from natural sources. Brain is vulnerable to the deleterious effects of IR. Therefore, scientists paid attention in identifying novel compounds to protect against radiation-induced brain injury. Adult male albino rats weighing 120-150 g were divided into five groups, 18 rats each. Group 1 served as control, group 2 received an oral daily dose of taurine (500 mg/kg) for 2 weeks. Group 3 was exposed to a whole body single dose of γ-irradiation (6 Gy)...
July 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014912/simulation-and-experimental-study-on-the-mechanism-of-the-chlorination-of-azithromycin
#8
Qiaozhen Guo, Zhenxia Du, Bing Shao
Azithromycin (AZI) has been listed as an emerging contaminant by the US EPA since 2009 because it is frequently detected in wastewater, surface water, and drinking water. In this paper, the chlorination of AZI in drinking water was simulated and studied. The results indicated that new compounds were generated in the chlorination of AZI. The byproducts were identified by liquid chromatography-quadrupole-time-of-flight mass spectrometry (LC-Q-TOF), and four of the byproducts were detected in real water samples...
July 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014909/microparticles-based-on-ionic-and-organosolv-lignins-for-the-controlled-release-of-atrazine
#9
María Eugenia Taverna, Carlos Alberto Busatto, Maia Raquel Lescano, Verónica Viviana Nicolau, Cristina Susana Zalazar, Gregorio Raúl Meira, Diana Alejandra Estenoz
Lignins are natural polymers of the lignocellulosic biomass. Nowadays, there is a growing interest in developing value-added products based on lignins due to their renewability, low cost and abundance. In this work, lignin microspheres from organosolv and ionic isolation processes were prepared for the controlled release of atrazine. Microspheres were prepared by the solvent extraction/evaporation technique. The controlled release of atrazine from organosolv and ionic lignins microparticles was studied in water...
July 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014908/novel-mechanisms-of-selenate-and-selenite-reduction-in-the-obligate-aerobic-bacterium-comamonas-testosteroni-s44
#10
Yuanqing Tan, Yuantao Wang, Yu Wang, Ding Xu, Yeting Huang, Dan Wang, Gejiao Wang, Christopher Rensing, Shixue Zheng
Selenium oxyanion reduction is an effective detoxification or/and assimilation processes in organisms, but little is known the mechanisms in aerobic bacteria. Aerobic Comamonas testosteroni S44 reduces Se(VI)/Se(IV) to less-toxic elemental selenium nanoparticles (SeNPs). For Se(VI) reduction, sulfate and Se(VI) reduction displayed a competitive relationship. When essential sulfate reducing genes were respectively disrupted, Se(VI) was not reduced to red-colored SeNPs. Consequently, Se(VI) reduction was catalyzed by enzymes of the sulfate reducing pathway...
July 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014914/natural-attenuation-of-tio-2-nanoparticles-in-a-fractured-hard-rock
#11
Patrick Ollivier, Hélène Pauwels, Guillaume Wille, Nicolas Devau, Gilles Braibant, Lise Cary, Géraldine Picot-Colbeaux, Jérôme Labille
Successive transport experiments of TiO2 nanoparticles (NP) suspension through fractured hard-rock column were done in laboratory. A low ionic strength (IS) water (0.8-1.3 10-3 M) at pH ∼4.5 was used, corresponding to the chemical composition of groundwater where the rock was collected (Naizin, France). The surface charge of TiO2 NP was positive while that of rock was negative favoring NP deposition. SEM/EDX reveals that NP were retained on a broad distribution of mineral collectors along the preferential flow pathways (i...
July 8, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014907/a-label-free-aptasensor-for-ultrasensitive-pb-2-detection-based-on-electrochemiluminescence-resonance-energy-transfer-between-carbon-nitride-nanofibers-and-ru-phen-3-2
#12
Yujiao Peng, Yang Li, Lingling Li, Jun-Jie Zhu
A label-free aptasensor was developed for ultrasensitive detection of Pb2+ based on electrochemiluminescence resonance energy transfer (ECL-RET) from graphitic carbon nitride nanofibers (CNNFs) to Ru(phen)3 2+ . The CNNFs synthesized via a facile two-step hydrolysis-electrolysis strategy showed intense and stable ECL signal by taking advantages of amplifying and stabilizing effect of carbon nanotubes and Au nanoparticles. After the specific hybridation between capture DNA and Pb2+ specific aptamer, Ru(phen)3 2+ could be captured onto CNNFs modified electrode by effectively intercalating into the grooves of double-strand DNA, thus triggering the ECL-RET and leading to highly enhanced ECL intensity...
July 8, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014905/effects-of-microplastics-on-the-uptake-distribution-and-biotransformation-of-chiral-antidepressant-venlafaxine-in-aquatic-ecosystem
#13
Han Qu, Ruixue Ma, Bin Wang, Yizhe Zhang, Lina Yin, Gang Yu, Shubo Deng, Jun Huang, Yujue Wang
In this study, we investigated the enantioselective environmental behaviors of the chiral antidepressant venlafaxine (VFX) in lab-scale aquatic ecosystems in the presence of microplastics (MPs). To determine the bioaccumulation, distribution, and metabolism as well as the effects of MPs on aquatic ecosystems, water-sediment, water-Lemna.minor (L.minor), water-Misgurnus.anguillicaudatus (M.anguillicaudatus), and water-sediment-L.minor-M.anguillicaudatus ecosystems were set up and exposed to venlafaxine and two levels of microplastics over a 90-day period...
July 8, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30007252/synthesis-and-characterization-of-a-heterojunction-rgo-zro-2-ag-3-po-4-nanocomposite-for-degradation-of-organic-contaminants
#14
Hassan Anwer, Jae-Woo Park
Synergy between surface adsorption and photocatalysis is key for effective contaminant degradation in the liquid phase. Herein, we report a heterojunction photocatalyst of reduced graphene oxide (rGO)/zirconium dioxide (ZrO2 )/silver phosphate (Ag3 PO4 ) that incorporates this synergy for 4-nitrophenol (PNP) removal. Compared with other photocatalyst combinations, ZrO2 and Ag3 PO4 coupling generates reactive species with greater degradation potential. ZrO2 and rGO were synthesized by a green approach using a one-step hydrothermal reaction in ethanol-water...
July 8, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014933/electrokinetically-assisted-oil-water-phase-separation-in-oily-sludge-with-implementing-novel-controller-system
#15
Arash Fellah Jahromi, Maria Elektorowicz
Upstream and downstream petroleum industry generate of significant amounts of oily sludge per day. On the other hand, a disposal of such sludge requires expensive pre-treatments following local regulations. Conventional processes, like centrifugal separation provide sludge volume reduction and water extraction. However, water-in-oil emulsion requires extra stages for phase separation, which overall increases the costs. Therefore, electrokinetically (EK) assisted oil-water phase separation method was considered...
July 7, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014917/a-new-function-of-spent-activated-carbon-in-bac-process-removing-heavy-metals-by-ion-exchange-mechanism
#16
Lihua Dong, Li'an Hou, Zhansheng Wang, Ping Gu, Guanyi Chen, Renfu Jiang
To investigate the potential of the spent activated carbon (AC) on removing heavy metals, the spent ACs used 5 years were collected from a full-scale BAC water treatment plant of southern China. The study found that the spent ACs had very good adsorption capacity for Pb(II) and Cd(II) at low concentrations (about 200 μg/L or less) with the maximum removal rates of more than 95% and 86% respectively (only 10-15% for virgin ACs), which will provide the theoretical basis for the disposal of spent AC (the hazardous waste) in BAC process or the combination reuse of spent AC and the virgin AC...
July 7, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014916/simultaneous-determination-of-paraquat-and-atrazine-in-water-samples-with-a-white-light-reflectance-spectroscopy-biosensor
#17
Eleftheria Stavra, Panagiota S Petrou, Georgios Koukouvinos, Christos Kiritsis, Ioannis Pirmettis, Minas Papadopoulos, Dimitrios Goustouridis, Anastasios Economou, Konstantinos Misiakos, Ioannis Raptis, Sotirios E Kakabakos
An optical immunosensor based on White Light Reflectance Spectroscopy for the simultaneous determination of the herbicides atrazine and paraquat in drinking water samples is demonstrated. The biosensor allows for the label-free real-time monitoring of biomolecular interactions taking place onto a SiO2 /Si chip by transforming the shift in the reflected interference spectrum due to reaction to effective biomolecular layer thickness. Dual-analyte determination is accomplished by functionalizing spatially distinct areas of the chip with protein conjugates of the two herbicides and scanning the surface with an optical reflection probe...
July 7, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014915/indoor-air-quality-in-health-clubs-impact-of-occupancy-and-type-of-performed-activities-on-exposure-levels
#18
Klara Slezakova, Cátia Peixoto, Maria do Carmo Pereira, Simone Morais
Associations between indoor air quality (IAQ) and health in sport practise environments are not well understood due to limited knowledge of magnitude of inhaled pollutants. Thus, this study assessed IAQ in four health clubs (HC1-HC4) and estimated inhaled doses during different types of activities. Gaseous (TVOCs, CO, O3 , CO2 ) and particulate pollutants (PM1 , PM4 ) were continuously collected during 40 days. IAQ was influenced both by human occupancy and the intensity of the performed exercises. Levels of all pollutants were higher when clubs were occupied (p < 0...
July 7, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30014911/facile-synthesis-of-smartaminosilane-modified-sno-2-porous-silica-nanocomposite-for-high-efficiency-removal-of-lead-ions-and-bacterial-inactivation
#19
Iman Kheshtzar, Mohsen Ghorbani, Maliheh Pashai Gatabi, Mohammad Soleimani Lashkenari
The aim of the present study is to synthesize a new and proficient nanoadsorbent for rapid removal of heavy metals and disinfection of microorganisms. The proposed nanoadsorbent was fabricated using SnO2 nanoparticles as the core, coated with mesoporous silica and further modified with 3-Aminopropyl triethoxysilane to render SnO2 /PSi/NH2 nanocomposite. The nanocomposite was characterized using Fourier Transform Infrared (FTIR), X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Nitrogen adsorption-desorption analysis...
July 7, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30007199/carbon-dots-decorated-na-2-w-4-o-13-composite-with-wo-3-for-highly-efficient-photocatalytic-antibacterial-activity
#20
Jingtao Zhang, Xing Liu, Xueying Wang, Lilong Mu, Mingming Yuan, Bingkun Liu, Hengzhen Shi
Photodisinfection by semiconductors has been proven to be an effective method for achieving antibacterial or antifungal activity. However, the toxicity of the nanomaterial to the environment and organisms is a major concern. Herein, a highly efficient and environmentally friendly photodisinfection material of a carbon dots (CDs) decorated Na2 W4 O13 composite with WO3 photocatalyst was fabricated via a facile hydrothermal-calcination approach. The TEM (transmission electron microscopy) images showed that CDs decorated the surface of the Na2 W4 O13 flakes...
July 7, 2018: Journal of Hazardous Materials
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