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Journal of Hazardous Materials

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https://www.readbyqxmd.com/read/28076770/gamma-irradiation-induced-complete-degradation-and-mineralization-of-phenol-in-aqueous-solution-effects-of-reagent
#1
Turki S Alkhuraiji, Sahidou O B Boukari, Fadhl S Alfadhl
This study aims to gain new insight into phenol degradation and mineralization in aqueous solution using ionizing radiation to control its radiolytic elimination under various experimental conditions and to present the different radical reactions involved in water radiolysis. The most obvious finding of this study is that the combination of a reagent, i.e., O3, H2O2, N2O, O2, or S2O8(2-), with γ-rays effectively enhances the radiolytic system for phenol degradation or mineralization. Radiolytic yield is higher with H2O2 than with S2O8(2-)...
January 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28076769/synthesis-of-cu-cu2o-hydrides-for-enhanced-removal-of-iodide-from-water
#2
Ping Mao, Liye Qi, Xiaodong Liu, Ying Liu, Yan Jiao, Shouwen Chen, Yi Yang
In order to improve the removal capacity of Cu2O for I(-) anions from water, Cu/Cu2O hybrids have been synthesized through a facile hydrothermal route, characterized by using SEM, XRD, XPS, and applied to remove I(-) anions under different experimental environments. The results demonstrate that the Cu content and morphology of samples can be tuned by the adding amount of ammonia. Meanwhile, the possible crystalline mechanism, Cu2O formed firstly and then metallic Cu generated, was presented. With the increasing of Cu doped amount, the removal capacity of Cu/Cu2O hybrids increased significantly from 0...
January 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28073059/role-of-microgel-formation-in-scavenging-of-chromophoric-dissolved-organic-matter-and-heavy-metals-in-a-river-sea-system
#3
Ruei-Feng Shiu, Chon-Lin Lee
We use riverine and marine dissolved organic carbon (DOC) polymers to examine their aggregation behavior, and to evaluate the roles of microgel formation in scavenging of chromophoric dissolved organic matter (CDOM) and heavy metals in a river-sea system. Our results indicate that riverine and marine microgels did not exhibit very much difference in size and self-assembly curve; however, the assembly effectiveness ([microgel]/DOC) of marine samples was much higher than riverine. Instead of concentration of DOC, other factors such as types and sources of DOC polymers may control the microgel abundance in aquatic environments...
January 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28073058/surface-engineering-of-pamam-sdb-chelating-resin-with-diglycolamic-acid-dga-functional-group-for-efficient-sorption-of-u-vi-and-th-iv-from-aqueous-medium
#4
P Ilaiyaraja, A K Singha Deb, D Ponraju, Sk Musharaf Ali, B Venkatraman
A novel chelating resin obtained via growth of PAMAM dendron on surface of styrene divinyl benzene resin beads, followed by diglycolamic acid functionalization of the dendrimer terminal. Batch experiments were conducted to study the effects of pH, nitric acid concentration, amount of adsorbent, shaking time, initial metal ion concentration and temperature on U(VI) and Th(IV) adsorption efficiency. Diglycolamic acid terminated PAMAM dendrimer functionalized styrene divinylbenzene chelating resin (DGA-PAMAM-SDB) is found to be an efficient candidate for the removal of U(VI) and Th(IV) ions from aqueous (pH >4) and nitric acid media (>3M)...
January 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28068644/mitigating-17%C3%AE-ethynylestradiol-water-contamination-through-binding-and-photosensitization-by-dissolved-humic-substances
#5
Dong Ren, Bin Huang, Benqin Yang, Xuejun Pan, Dionysios D Dionysiou
Photodegradation is an important abiotic pathway transforming organic pollutants in natural waters. Humic substances (HS), including humic and fulvic acids, are capable of accelerating the photodegradation of steroid estrogens. However, how the photodegradtion of the emerging pollutants influenced by HS is not clear. Thus, we studied the roles and mechanisms of HS in inducing the photodegradation of 17α-ethynylestradiol (EE2). HS generally induces EE2 photodegradation through binding and reactive species generation...
January 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28068645/characteristics-of-pah-tar-oil-contaminated-soils-black-particles-resins-and-implications-for-treatment-strategies
#6
Clément Trellu, Anja Miltner, Rosita Gallo, David Huguenot, Eric D van Hullebusch, Giovanni Esposito, Mehmet A Oturan, Matthias Kästner
Tar oil contamination is a major environmental concern due to health impacts of polycyclic aromatic hydrocarbons (PAH) and the difficulty of reaching acceptable remediation end-points. Six tar oil-contaminated soils with different industrial histories were compared to investigate contamination characteristics by black particles. Here we provide a simple method tested on 6 soils to visualize and identify large amounts of black particles (BP) as either solid aggregates of resinified and weathered tar oil or various wood/coke/coal-like materials derived from the contamination history...
December 31, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28076771/screening-and-prioritization-of-micropollutants-in-wastewaters-from-on-site-sewage-treatment-facilities
#7
Meritxell Gros, Kristin M Blum, Henrik Jernstedt, Gunno Renman, Sara Rodríguez-Mozaz, Peter Haglund, Patrik L Andersson, Karin Wiberg, Lutz Ahrens
A comprehensive screening of micropollutants was performed in wastewaters from on-site sewage treatment facilities (OSSFs) and urban wastewater treatment plants (WWTPs) in Sweden. A suspect screening approach, using high resolution mass spectrometry, was developed and used in combination with target analysis. With this strategy, a total number of 79 micropollutants were successfully identified, which belong to the groups of per- and polyfluoroalkyl substances (PFASs), pesticides, phosphorus-containing flame retardants (PFRs) and pharmaceuticals and personal care products (PPCPs)...
December 30, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28064143/production-of-trihalomethanes-haloacetaldehydes-and-haloacetonitriles-during-chlorination-of-microcystin-lr-and-impacts-of-pre-oxidation-on-their-formation
#8
Wenhai Chu, Dechang Yao, Yang Deng, Minghao Sui, Naiyun Gao
Microcystins (MCs) in drinking water have gained much attention due to their adverse health effects. However, little is known about the impact of pre-oxidation in the formation of disinfection by-products (DBPs) during the downstream chlorination of MCs. The present study examined the formation of both carbonaceous and nitrogenous DBPs from chlorination of MC-LR (the most abundant MC species) and evaluated the impact of permanganate (PM), hydrogen peroxide (H2O2) and chlorine dioxide (ClO2) pre-oxidation on the DBP formation in chlorination...
December 29, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28064142/hydroxyl-multi-walled-carbon-nanotube-modified-nanocrystalline-pbo2-anode-for-removal-of-pyridine-from-wastewater
#9
Zesheng Xu, Han Liu, Junfeng Niu, Yijing Zhou, Chong Wang, Yue Wang
We prepared a hydroxyl multi-wall carbon nanotube-modified nanocrystalline PbO2 anode (MWCNTs-OH-PbO2) featuring high oxygen evolution potential, large effective area, and excellent electrocatalytic performance. The oxygen evolution potential and effective area of the MWCNTs-OH-PbO2 electrode were 1.5 and 3.7-fold higher than the traditional PbO2 electrode. Electrochemical degradation of pyridine in aqueous solution was investigated by using the MWCNTs-OH-PbO2 anode. Based on pyridine decay rate (93.8%), total organic carbon reduction (84...
December 29, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28064147/experimental-and-theoretical-studies-on-stability-of-new-stabilizers-for-n-methyl-p-nitroaniline-derivative-in-cmdb-propellants
#10
Qiufan Tang, Xuezhong Fan, Jizhen Li, Fuqiang Bi, Xiaolong Fu, Lianjie Zhai
Although N-methyl-P-nitroaniline (MNA) was a quite effective stabilizer in composite modified double base (CMDB) propellants, it undergoes crystallization easily from nitroglycerin (NG) during storage. In order to improve its solubility in nitroglycerin (NG) and the stability in propellants, several new stabilizers including N-ethyl-p-nitroaniline (ENA), N-n-propyl-p-nitroaniline (n-PNA), N-i-propyl-p-nitroaniline (i-PNA), N-n-butyl-p-nitroaniline (n-BNA) and N-t-butyl-p-nitroaniline (t-BNA) were designed and synthesized to replace MNA by increasing the carbon chain length...
December 28, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28081458/multistage-bioassociation-of-uranium-onto-an-extremely-halophilic-archaeon-revealed-by-a-unique-combination-of-spectroscopic-and-microscopic-techniques
#11
Miriam Bader, Katharina Müller, Harald Foerstendorf, Björn Drobot, Matthias Schmidt, Niculina Musat, Juliet S Swanson, Donald T Reed, Thorsten Stumpf, Andrea Cherkouk
The interactions of two extremely halophilic archaea with uranium were investigated at high ionic strength as a function of time, pH and uranium concentration. Halobacterium noricense DSM-15987 and Halobacterium sp. putatively noricense, isolated from the Waste Isolation Pilot Plant repository, were used for these investigations. The kinetics of U(VI) bioassociation with both strains showed an atypical multistage behavior, meaning that after an initial phase of U(VI) sorption, an unexpected interim period of U(VI) release was observed, followed by a slow reassociation of uranium with the cells...
December 27, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28049066/enhanced-catalytic-degradation-of-ciprofloxacin-with-fes2-sio2-microspheres-as-heterogeneous-fenton-catalyst-kinetics-reaction-pathways-and-mechanism
#12
Zeng-Hui Diao, Xiang-Rong Xu, Dan Jiang, Gang Li, Jin-Jun Liu, Ling-Jun Kong, Lin-Zi Zuo
In this study, the application of FeS2/SiO2 microspheres as a catalyst to activate H2O2 for the degradation of ciprofloxacin (CIP) was systematically investigated. Results demonstrated that the presence of SiO2 microspheres on the surface of FeS2 could effectively make the reaction of aqueous Fe(2+) and H2O2 smoothly continuous by controlling the release of aqueous Fe(2+) from FeS2. Nearly 100% of CIP was degraded after 60min under the optimum conditions. A superior performance on the CIP degradation and high reusability of the catalyst was obtained in FeS2/SiO2 microspheres activated H2O2 system...
December 27, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28043044/ascorbic-acid-induced-atrazine-degradation
#13
Xiaojing Hou, Xiaopeng Huang, Zhihui Ai, Jincai Zhao, Lizhi Zhang
In this study, we systematically investigated the degradation efficiency and the degradation mechanism of atrazine in the presence of ascorbic acid at different pH values. Although atrazine could be degraded by ascorbic acid in a wide pH range from 4 to 12, its degradation under either acidic (pH≤4) or alkaline (pH≥12) condition was more efficient than under neutral condition (pH=7). This pH dependent atrazine degradation was related to the reactive characteristic of atrazine and the reductive activity of ascorbic acid...
December 27, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28073095/enhanced-wwtp-effluent-organic-matter-removal-in-hybrid-ozonation-coagulation-hoc-process-catalyzed-by-al-based-coagulant
#14
Xin Jin, Pengkang Jin, Rui Hou, Lei Yang, Xiaochang C Wang
A novel hybrid ozonation-coagulation (HOC) process was developed for application in wastewater reclamation. In this process, ozonation and coagulation occurred simultaneously within a single unit. Compared with the conventional pre-ozonation-coagulation process, the HOC process exhibited much better performance in removing dissolved organic matters. In particular, the maximal organic matters removal efficiency was obtained at the ozone dosage of 1mgO3/mg DOC at each pH value (pH 5, 7 and 9). In order to interpret the mechanism of the HOC process, ozone decomposition was monitored...
December 26, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28064144/chlorite-alteration-in-aqueous-solutions-and-uranium-removal-by-altered-chlorite
#15
Eungyeong Kim, Hyangsig Ahn, Ho Young Jo, Ji-Hun Ryu, Yong-Kwon Koh
Chlorite alteration and the U removal capacity of altered chlorite were investigated. Batch kinetic dissolution tests using clinochlore CCa-2 were conducted for 60days in aqueous solutions of various pHs and ionic strengths. Batch sorption tests using these altered chlorite samples were conducted for 48h with natural groundwater containing 3.06×10(-6)M U. Chlorite dissolution was influenced more by pHo than by the ionic strength of the solution. TEM analysis revealed Fe(oxy)hydroxide aggregates in the solid residue from the batch dissolution test with 0...
December 26, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28056399/experimental-study-on-a-comparison-of-typical-premixed-combustible-gas-air-flame-propagation-in-a-horizontal-rectangular-closed-duct
#16
Kaiqiang Jin, Qiangling Duan, K M Liew, Zhongjing Peng, Liang Gong, Jinhua Sun
Research surrounding premixed flame propagation in ducts has a history of more than one hundred years. Most previous studies focus on the tulip flame formation and flame acceleration in pure gas fuel-air flame. However, the premixed natural gas-air flame may show different behaviors and pressure dynamics due to its unique composition. Natural gas, methane and acetylene are chosen here to conduct a comparison study on different flame behaviors and pressure dynamics, and to explore the influence of different compositions on premixed flame dynamics...
December 26, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28043047/novel-affinity-membranes-with-macrocyclic-spacer-arms-synthesized-via-click-chemistry-for-lysozyme-binding
#17
Ligang Lin, Hui Sun, Kaiyu Zhang, Yonghui Zhong, Qi Cheng, Xihui Bian, Qingping Xin, Bowen Cheng, Xianshe Feng, Yuzhong Zhang
Affinity membrane has great potential for applications in bioseparation and purification. Disclosed herein is the design of a novel affinity membrane with macrocyclic spacer arms for lysozyme binding. The clickable azide-cyclodextrin (CD) arms and clickable alkyne ethylene-vinyl alcohol (EVAL) chains are designed and prepared. By the azide-alkyne click reaction, the EVAL-CD-ligands affinity membranes with CD spacer arms in three-dimensional micro channels have been successfully fabricated. The FT-IR, XPS, NMR, SEM and SEM-EDS results give detailed information of structure evolution...
December 26, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28043045/continuous-removal-and-recovery-of-tellurium-in-an-upflow-anaerobic-granular-sludge-bed-reactor
#18
Joyabrata Mal, Yarlagadda V Nancharaiah, Neeraj Maheshwari, Eric D van Hullebusch, Piet N L Lens
Continuous removal of tellurite (TeO3(2-)) from synthetic wastewater and subsequent recovery in the form of elemental tellurium was studied in an upflow anaerobic granular sludge bed (UASB) reactor operated at 30°C. The UASB reactor was inoculated with anaerobic granular sludge and fed with lactate as carbon source and electron donor at an organic loading rate of 0.6g CODL(-1)d(-1). After establishing efficient and stable COD removal, the reactor was fed with 10mg TeO3(2-)L(-1) for 42 d before increasing the influent concentration to 20mg TeO3(2-)L(-1)...
December 26, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28040633/elevated-co2-levels-increase-the-toxicity-of-zno-nanoparticles-to-goldfish-carassius-auratus-in-a-water-sediment-ecosystem
#19
Ying Yin, Zhengxue Hu, Wenchao Du, Fuxun Ai, Rong Ji, Jorge L Gardea-Torresdey, Hongyan Guo
Concerns about the environmental safety of metal-based nanoparticles (MNPs) in aquatic ecosystems are increasing. Simultaneously, elevated atmospheric CO2 levels are a serious problem worldwide, making it possible for the combined exposure of MNPs and elevated CO2 to the ecosystem. Here we studied the toxicity of nZnO to goldfish in a water-sediment ecosystem using open-top chambers flushed with ambient (400±10μL/L) or elevated (600±10μL/L) CO2 for 30days. We measured the content of Zn in suspension and fish, and analyzed physiological and biochemical changes in fish tissues...
December 26, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28064146/chronic-exposure-of-zinc-oxide-nanoparticles-causes-deviant-phenotype-in-drosophila-melanogaster
#20
Avnika Singh Anand, Dipti N Prasad, Shashi Bala Singh, Ekta Kohli
Zinc oxide nanoparticles (ZnO NPs) are commonly used nanomaterials (NMs) with versatile applications from high-end technologies to household products. This pervasive utilisation has brought human in the close interface with nanoparticles (NPs), hence questioning their safety prior to usage is a must. In this study, we have assessed the effects of chronic exposure to ZnO NPs (<50nm) on the model organism Drosophila melanogaster. Potential toxic effects were studied by evaluating longevity, climbing ability, oxidative stress and DNA fragmentation...
December 23, 2016: Journal of Hazardous Materials
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