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Journal of Hazardous Materials

Hai-Long Liu, Jun Zhou, Min Li, Yuan-Mei Hu, Xiaoli Liu, Jing Zhou
The objective of this study was to investigate the bioavailability of heavy metals from atmospheric deposition on the soil-pakchoi (Brassica chinensis L.) system near a smelter. Soil reciprocal translocation experiment was conducted with seven groups of pot culture (filled with soils of gradient levels of heavy metals) in three sites of gradient atmospheric heavy metal depositions. Results showed that the newly deposited heavy metals (Cu and Cd) were preferential retention in topsoil (0-4 cm) and presented as higher bioavailable fractions compared to those in original soils...
September 12, 2018: Journal of Hazardous Materials
Xiang Hu, Lanjun Jia, Jie Cheng, Zhirong Sun
In this paper, the effect of cyanoguanidine (CNGE) for tailoring pore size during the soft-templating preparation of mesoporous carbon materials was studied. In consideration of cyclic utilization, the surface of the mesoporous carbon materials were doped with magnetic Fe3 O4 particles. The characterization results (including TEM, XRD, BET, TGA and FT-IR) showed that adding CNGE did not destroy the ordered porous structure; instead, it changed the pore size from 2.98 nm to 9.42 nm. Besides, the mesoporous carbon materials exhibited a strong magnetic response owing to the dopant of Fe3 O4 particles...
September 11, 2018: Journal of Hazardous Materials
Antony Anet, Shilpa Olakkaran, Anupama Kizhakke Purayil, Gurushankara Hunasanahally Puttaswamygowda
This study investigates Bisphenol A (BPA) induced oxidative stress that mediates the genotoxicity in in vivo model Drosophila melanogaster. The calculated LC50 for BPA was 12.35 μg/mL. The strains of D. melanogaster were reared in 0.1, 1.0, 2.5 and 5.0 μg/mL BPA treated food media from the embryonic stage (egg); oxidative stress and genotoxicity parameters were analyzed. Food intake analysis confirmed that BPA is not an anti feedant for Drosophila larvae and it consumed BPA containing food. Increased reactive oxygen species (ROS) and lipid peroxidation (LPO) and depletion of superoxide dismutase (SOD), catalase (CAT), glutathione (GSH) and glutathione-s-transferase (GST) antioxidant activities were observed in BPA treated groups compared to control...
September 10, 2018: Journal of Hazardous Materials
Dongdong Chen, Junguang Liu, Zhenzhen Jia, Jianzhang Fang, Fan Yang, Yiming Tang, Kun Wu, Zhang Liu, ZhanQiang Fang
Developing highly efficient and inexpensive photocatalysts without noble metals, yet remarkably enhancing hydrogen production and Cr(VI) reduction activity, is highly needed. Here, the effective photocatalytic H2 evolution under visible light from an Eosin Y (EY)-sensitized (P, Mo)-g-C3 Nx system by avoiding any noble metal co-catalyst is reported by the first time. Meanwhile, the optimized sample also displays the excellent performance in photocatalytic hexavalent chromium (Cr(VI)) reduction. In addition, this composite exhibits delectable stability for photocatalytic activities, no significant decay of activity is being observed after 16h reaction for photocatalytic H2 evolution (8h for Cr(VI) reduction)...
September 5, 2018: Journal of Hazardous Materials
Yuyi Yang, Guihua Liu, Chen Ye, Wenzhi Liu
Antibiotic resistance genes (ARGs) have been identified as emerging pollutants in the environment. However, little information is available for ARGs in natural wetlands at high altitude. In this study, we investigated 32 wetlands across the Qinghai-Tibetan Plateau, with the variation of wetland types, altitude, and environmental factors, to assess the determinant factor of ARGs in this area. ARGs were detected in all the wetlands, ranged from 1.80 × 105 to 1.35 × 107 copies per gram of soils. The ARGs in wetland soils were diverse and abundant, and varied from each site, but the spatial geographical distance did not influence the ARG profile...
September 3, 2018: Journal of Hazardous Materials
Thomas Robshaw, Sudhir Tukra, Deborah B Hammond, Graham J Leggett, Mark D Ogden
Spent potlining (SPL) hazardous waste is a potentially valuable source of fluoride, which may be recovered through chemical leaching and adsorption with a selective sorbent. For this purpose, the commercially available chelating resin Purolite® S950+ was loaded with lanthanum ions, to create a novel ligand-exchange sorbent. The equilibrium fluoride uptake behaviour of the resin was thoroughly investigated, using NaF solution and a simulant leachate of SPL waste. The resin exhibited a large maximum defluoridation capacity of 187 ± 15 mg g-1 from NaF solution and 126 ± 10 mg g-1 from the leachate, with solution pH being strongly influential to uptake performance...
September 3, 2018: Journal of Hazardous Materials
Ehsan Aghayani, Gholamreza Moussavi, Kazem Naddafi
Two strategies were attempted to improve the biodegradation and mineralization of toluene vapors in the activated sludge diffusion (ASD) process using biosurfactant-generating Pseudomonas spp. and Bacillus spp. mixture. Different operational parameters including toluene concentration, superficial air velocity, biomass concentration, moving-media insertion and H2 O2 were evaluated on toluene removal in the ASD process within 550 days of operation. It was found that complete biodegradation and 79.8% mineralization of toluene vapors at inlet loading rate of 144 g/m3 ...
September 1, 2018: Journal of Hazardous Materials
Chao Liang, Cheng-Gang Niu, Lei Zhang, Xiao-Ju Wen, Shi-Feng Yang, Hai Guo, Guang-Ming Zeng
The efficient electron-hole charge pair separation, ultra-fast electron migration and excellent light harvest capacity are essential for semiconductor photocatalyst with superior photocatalytic performance. In this study, we constructed layered 2D/2D heterojunction composite of Bi@Bi5 O7 I/rGO (BiBGOI) through a facile surface charge mediated self-assembly strategy. The unique 2D/2D heterostructure with face to face contact can increase the contact area and generate a large amount of charge transfer nanochannels in the interfacial heterojunction, resulting in the enhancement of photocatalytic activity...
September 1, 2018: Journal of Hazardous Materials
Wen Yu, Yangyang Sun, Mengjie Lei, Shumei Chen, Tingsheng Qiu, Qiongyao Tang
Flotation waste of copper slag (FWCS) was used as a raw material for the preparation of a micro-electrolysis material (MEM) through a carbothermal reduction process. The performance of MEM was evaluated for the degradation of organic contaminants in water. The effects of preparation conditions on the performance of MEM were investigated. Results showed that the MEM prepared under the conditions of calcination temperature of 1100 °C, calcination time of 60 min, and coal dosage of 25% presented the best performance for degrading methyl orange (MO)...
September 1, 2018: Journal of Hazardous Materials
Hassan Najafian, Faranak Manteghi, Farshad Beshkar, Masoud Salavati-Niasari
In the present study, CuBi2 O4 /Bi3 ClO4 nanocomposites have been fabricated via an improved Pechini sol-gel process using the mixtures of various gelling agents and polybasic acids. This work shows that by controlling the reaction conditions such as kind of polybasic acids, gelling agents, pH and mole ratio of polybasic acid to total metals, the CuBi2 O4 /Bi3 ClO4 nanocomposites with ultrafine sphere-like, irregular polyhedral-like, plate-like and cubic-like morphologies were prepared. The phase, elemental composition, morphology and optical characteristics of as-synthesized CuBi2 O4 /Bi3 ClO4 nanostructures were analyzed utilizing UV-Vis, FESEM, TEM, HRTEM, FT-IR, XRD, TOC and EDS techniques...
September 1, 2018: Journal of Hazardous Materials
Lu Jia, Jianzhong Ma, Dangge Gao, William R T Tait, Luyi Sun
A water-based silsesquioxane (POSS)-containing polymer, POSS-PAA, was synthesized by using octavinyl-POSS (V-POSS) and acrylic acid (AA) via interfacial polymerization. The TEM of POSS-PAA showed that the polymer formed a core-shell structure in aqueous solution and was well-dispersed. The star-shaped POSS-PAA and linear PAA were both tanned with 3.5% chromium tanning agent, and leather hide was tanned with 3.5% chromium tanning agent as a control. The results showed that the shrinkage temperature of wet-blue leather treated by POSS-PAA was increased by 3...
August 31, 2018: Journal of Hazardous Materials
Eva Díaz, Lucía Pintado, Laura Faba, Salvador Ordóñez, José Manuel González-LaFuente
The different technologies applied to the sewage sludge management have in common a first step devoted to the storage. In the case of dried sludges, this storage leads to important safety concerns because of the explosive character of the resulting dusts. In order to ensure safety in the storage step, it is necessary to evaluate the spontaneous combustion trends on terms of measurable chemical and physical properties of the dried sludges. In order to accomplish this scope, twelve samples from different wastewater treatment plants were characterized, correlating the susceptibility to spontaneous combustion with both the sludge composition and the heating value...
August 30, 2018: Journal of Hazardous Materials
Siming You, Siew Wah Ho, Tingting Li, Thawatchai Maneerung, Chi-Hwa Wang
In this work, we firstly examined the technical feasibility of geopolymer synthesis from the coal fly ash with high iron oxide (48.84 wt.%) and calcium oxide (22.15 wt.%) contents. The heat resistance of geopolymer was represented by the dry weight loss which ranged from 2.5 to 4.9% and was better than that (11.7%) of OPC. However, the high iron oxide content made the acid resistance (13-14%) of geopolymer inferior to OPC. The economics of geopolymer production changes significantly upon the variation in the arrangement of material use and geopolymer price...
August 29, 2018: Journal of Hazardous Materials
Jih-Hsing Chang, Cheng-Di Dong, Shan-Yi Shen
Some agricultural lands have been contaminated by heavy metals in Taiwan for several decades, because the irrigation system was polluted by wastewater. In this study, a circulation-enhanced electrokinetics (CEEK) and phytoremediation were applied alternately to the real lead-contaminated site. In the beginning, the CEEK was used; then, the corn plants were raised. After this phytoremediation, the CEEK was employed again. Experimental results show that the lead concentration can be reduced from 5672 mg/kg to 2083 mg/kg (around 63%) after the three-stage treatment (CEEK + corn + CEEK)...
August 28, 2018: Journal of Hazardous Materials
Xuejiao Liu, Dengguo Lai, Yin Wang
Activated carbon supported nanoscale zero-valent iron composite (NZVI/AC) at ultralow iron content was synthesized and used to remove Pb(II) from aqueous solution. The technical characterization revealed that the loaded amorphous NZVI nanoparticles had a chain-like shape in or close to pores and were found as individual nanospheres with size of approximately 10 nm on the outer surface. The NZVI/AC with the iron content of only 1.57% showed a highly efficient Pb(II) removal performance with 95% of Pb(II) eliminated within 5 min...
August 27, 2018: Journal of Hazardous Materials
Yuefei Ji, Yuanyuan Shi, Yan Yang, Peizeng Yang, Lu Wang, Junhe Lu, Jianhua Li, Lei Zhou, Corinne Ferronato, Jean-Marc Chovelon
Sulfate radical (SO4 - )-based oxidation of nitrophenols (NPs) have been widely studied; however, formation of potentially more toxic polynitroaromatic intermediates has been overlooked. In this contribution, we systematically investigated the degradation of four NPs by a SO4 - -based oxidation process. Degradation efficiency of NPs followed the order: 2-nitrophenol (2-NP) > 4-nitrophenol (4-NP) > 2,4-dinitrophenol (2,4-DNP) > 2,6-dinitrophenol (2,6-DNP). HPLC and LC-MS/MS analysis confirmed the formation of 2,4-DNP, 2,6-DNP and 2,4,6-trinitrophenol (2,4,6-TNP) during NPs transformation by SO4 - , suggesting that both denitration and renitration processes occurred...
August 25, 2018: Journal of Hazardous Materials
Yingwu Yao, Bingli Ren, Yang Yang, Chunjiao Huang, Mengyao Li
Novel Ce-PbO2 /ZrO2 composite electrodes were successfully fabricated in lead nitrate solution containing cerium ions and ZrO2 particles by composite electrodeposition method. SEM images and XRD results indicated that Ce-PbO2 /ZrO2 composite electrodes have compact structure and fine grain size. Ce-PbO2 /ZrO2 composite electrode has higher oxygen evolution overpotential and stability than Ce-PbO2 electrode. The service life of Ce-PbO2 /ZrO2 composite electrode reaches 318 h, which is 4.2 times as that of Ce-PbO2 electrodes (74 h)...
August 25, 2018: Journal of Hazardous Materials
Lise Charuaud, Emilie Jarde, Anne Jaffrezic, Marie-Florence Thomas, Barbara Le Bot
Veterinary pharmaceuticals (VPs) increasingly used in animal husbandry have led to their presence in aquatic environments -surface water (SW) or groundwater (GW) - and even in tap water. This review focuses on studies from 2007 to 2017. Sixty-eight different veterinary pharmaceutical residues (VPRs) have been quantified worldwide in natural waters at concentrations ranging from nanograms per liter (ng L-1 ) to several micrograms per liter (μg L-1 ). An extensive up-to-date on sales and tonnages of VPs worldwide has been performed...
August 24, 2018: Journal of Hazardous Materials
Lei He, Yanan Dong, Yane Zheng, Qingming Jia, Shaoyun Shan, Yaqin Zhang
A novel magnetic MIL-101(Fe)/TiO2 composite was synthesized for photo degradation of tetracycline (TC) under solar light. The composite was characterized by XRD, TGA, SEM, TEM, EDS, BET, FTIR, XPS, VSM, ESR, and PL. The resultant composite was environment friendly material, which exhibited high TC degradation efficiency and excellent reusability. In the meantime, it could be separated easily from TC solution by using magnet, which would save significant time and cost of preparation and degradation, having broad prospect in application...
August 24, 2018: Journal of Hazardous Materials
A Karthik, K Sudalaimani, C T Vijayakumar, S S Saravanakumar
Heat curing catalyzed the geopolymerization reaction in geopolymers whereas the practical challenges in applying heat curing process limited the applications of geopolymers to precast elements alone. Bio-additives inclusion could facilitate ambient temperature curing that lead to environment friendly self cured geopolymers. Natural sugars (molasses/palm jaggery/honey) and terminalia chebula were used as bio-additives in fly ash (FA) and ground granulated blast furnace slag (GGBS) based geopolymer mortars. X-ray diffraction (XRD), Fourier transform infrared spectral (FTIR), thermogravimetric (TG/DTG) and scanning electron microscopic (SEM) studies were used for the characterization for all geopolymer mortar samples...
August 24, 2018: Journal of Hazardous Materials
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