Environmental Geochemistry and Health,2018年40(5):2143-2153 ISSN：0269-4042
[Wang, Yangyang] Henan Univ, Key Res Inst Yellow River Civilizat & Sustainable, Kaifeng 475004, Peoples R China.;[Wang, Yangyang] Henan Univ, Collaborat Innovat Ctr Yellow River Civilizat Hen, Kaifeng 475004, Peoples R China.;[Wang, Yangyang; Luo, Lin] Hunan Agr Univ, Sch Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Wang, Yangyang; Li, Fangfang; Song, Jian] Henan Univ, Inst Sustainable Dev Agr & Rural Area, Kaifeng 475004, Henan, Peoples R China.;[Xiao, Ruiyang; Yang, Zhihui; Chai, Liyuan] Cent S Univ, Sch Met & Environm, Dept Environm Engn, Changsha 410083, Hunan, Peoples R China.
[Xiao, Ruiyang] Cent S Univ, Sch Met & Environm, Dept Environm Engn, Changsha 410083, Hunan, Peoples R China.
6th International Conference on Medical Geology (MEDGEO)
JUL 26-AUG 01, 2015
Univ Aveiro, Aveiro, PORTUGAL
[Wang, Yangyang] Henan Univ, Key Res Inst Yellow River Civilizat & Sustainable, Kaifeng 475004, Peoples R China.^[Wang, Yangyang] Henan Univ, Collaborat Innovat Ctr Yellow River Civilizat Hen, Kaifeng 475004, Peoples R China.^[Wang, Yangyang;Luo, Lin] Hunan Agr Univ, Sch Resources & Environm, Changsha 410128, Hunan, Peoples R China.^[Wang, Yangyang;Li, Fangfang;Song, Jian] Henan Univ, Inst Sustainable Dev Agr & Rural Area, Kaifeng 475004, Henan, Peoples R China.^[Xiao, Ruiyang;Yang, Zhihui;Chai, Liyuan] Cent S Univ, Sch Met & Environm, Dept Environm Engn, Changsha 410083, Hunan, Peoples R China.^[Xiao, Ruiyang;Yang, Zhihui;Chai, Liyuan] Chinese Natl Engn Res Ctr Control & Treatment Hea, Changsha 410083, Hunan, Peoples R China.
Heavy metal contamination;Stabilization;Calcareous agricultural soil;Red mud;Wheat
Red mud (RM) was used to remediate heavy metal-contaminated soils. Experiments with two different dosages of RM added to soils were carried out in this study. It was found that soil pH increased 0.3 and 0.5 unit with the dosage of 3 and 5% (wt%), respectively. At the dosage of 5%, the highest stabilization efficiencies for Cd, Pb, Cu and Zn reached 67.95, 64.21, 43.73 and 63.73%, respectively. The addition of RM obviously transferred Cd from the exchangeable fraction to the residual fraction. Meanwhile, in comparison with the control (no RM added), it reduced 24.38, 49.20, 19.42 and 8.89% of Cd, Pb, Cu and Zn in wheat grains at the RM addition dosage of 5%, respectively. At the same time, the yield of wheat grains increased 17.81 and 24.66% at the RM addition dosage of 3 and 5%, respectively. Finally, the addition of RM did not change the soil bacterial community. These results indicate that RM has a great potential in stabilizing heavy metals in calcareous agricultural soils.
In this article, Hafnium oxide (HfO2) overlayer was reported to be loaded on the surface of WO3 nanoparticles by a simple solvothermal method for the first time. HfO2 powders were dissolved in the concentrated sulfuric acid as raw material. The physicochemical properties of WO3 nanoparticles with and without HfO2 passivation layer were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). For the film electrode prepared with doctor-blade method, scanning electron microscopy (SEM) and UV–vis absorbance spectroscopy (UV–vis) were used to determine the morphological and optical properties. Meantime, the photoelectrochemical properties of two samples were evaluated by means of liner sweep voltammogram, electrochemical impedance spectroscopy (EIS), intensity modulated photocurrent spectrum (IMPS) and incident photon to current conversion efficiency (IPCE). The WO3 film with HfO2 passivation layer showed better photoelectrochemical performance which could be ascribed to the inhibition of the recombination of electron-holes.
Sixteen treatments of soil contaminated by Cu, Pb, and Zn by the addition of a different percentage of biochar and compost were incubated for 120days. The abundance of denitrifying genes such as narG, nirK, nirS and nosZ and the ammonia-oxidizing amoA genes of ammonia-oxidizing archaea/bacteria (AOA/AOB), soil nitrite reductase activity (S-NiR) and their shaping factors were also determined. The relationships between functional genes, S-NiR, and physico-chemical parameters were analyzed using the Pearson correlation method. The study found that the changes in physico-chemical parameters, including water-soluble organic carbon (WSC), nitrate (NO3(-)) and ammonium (NH4(+)), were predominant in different treatments. The abundance of nirK and narG genes is most sensitive to the changes in the properties of the soil sample. Bacterial 16S rDNA gene abundance was significantly affected by NO3(-) and S-NiR (P<0.05). Nitrifying genes were mainly correlated to WSC and S-NiR, while denitrifying genes were associated with pH, electrical conductivity, NO3(-) and S-NiR. The systematic study for the relationship between the genes and the environmental parameters will help us to deep understand the biological mechanisms of nitrogen cycle in heavy metal contaminated soils remediated by biochar and compost.
Iron (hydr)oxides;Humic acid;Composites;Cd;Sorption;EXAFS
Adsorption and coprecipitation of organic matter with iron (hydr)oxides can alter iron (hydr)oxide surface properties and their reactivity towards nutrient elements and heavy metals. Organo-mineral composites were synthesized using humic acid (HA) and iron oxide, during coprecipitation with ferrihydrite (Fh) and adsorption to pre-formed Fh with two C loadings. The Fh-HA coprecipitated composites have a higher C content and smaller surface area compared to the equivalent adsorbed composites. NanoSIMS shows there is a high degree of spatial correlation between Fe and C for both composites, but C distribution is more uniform in the coprecipitated composites. The C 1s NEXAFS reveals a similar C composition between the Fh-HA coprecipitated and adsorbed composites. However composites at high carbon loading are more enriched in aromatic C, likely due to preferential binding of carboxyl functional groups on aromatic rings in the HA. The amount of Cd sorbed is independent of the composite type, either coprecipitated or adsorbed, but is a function of the C loading. Composites with low C loading show Cd sorption that is almost identical to pure Fh, while composites with high C loading show Cd sorption that is intermediate between pure Fh and pure HA, with sorption significantly enhanced over pure Fh at pH < 6.5. A bidentate edge-sharing binding was identified for Cd on pure Fh and Cd-carboxyl binding on pure HA. These findings have significant implications not only for the sequestration of Cd in contaminated environments but also the coupled biogeochemical cycling of Cd, Fe and C in the critical zone. Crown Copyright (C) 2018 Published by Elsevier Ltd. All rights reserved.
[Zhou, Yaoyu] College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China. Electronic address:;[Ahmar, Sunny] MOA Key Laboratory of Crop Ecophysiology and Farming System Core in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: sunny.;[Ahmad Anjum, Rao Muhammad] Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, 38040, Pakistan. Electronic address: rao.ahmad.;[Malik, Zaffar; Parveen, Aasma] Department of Soil Science, University College of Agriculture and Environmental Sciences, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan. Electronic address:;[Wang, Bo; Liu, Lijun; Saleem, Muhammad Hamzah] MOA Key Laboratory of Crop Ecophysiology and Farming System Core in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China. Electronic address:
Flax (Linum usitatissimum L.) is one of the oldest predominant industrial crops grown for seed, oil and fiber. The present study was executed to evaluate the morpho-physiological traits, biochemical responses, gas exchange parameters and phytoextraction potential of flax raised in differentially copper (Cu) spiked soil viz (0, 200, 400 and 600 mg Cu kg(-1) soil) under greenhouse pot experiment. The results revealed that flax plants were able to grow up to 400 mg kg(-1) Cu level without showing significant growth inhabitation while, further inference of Cu (600 mg kg(-1)) in the soil prominently inhibited flax growth and biomass accumulation. Compared to the control, contents of proline and malondialdehyde (MDA) were increased by 160.0% and 754.1% accordingly, at 600 mg Cu kg(-1) soil level. The Cu-induced oxidative stress was minimized by the enhanced activities of superoxide dismutase (SOD) by 189.2% and guaiacol peroxidase (POD) by 300.8% in the leaves of flax at 600 mg Cu kg(-1) soil level, compared to the untreated control. The plant Cu concentration was determined at 35, 70, 105 and 140 days after sowing (DAS) and results depicted that 16.9 times higher Cu concentration was accumulated in flax roots while little (14.9 times) was transported to the shoots at early stage of growth, i.e. 35 DAS. While at 140 DAS, Cu was highly (21.7 times) transported to the shoots while, only 12.3 times Cu was accumulated in the roots at 600 mg Cu kg(-1) soil level, compared to control. Meanwhile, Cu uptake by flax was boosted up to 253 mg kg(-1) from the soil and thereby extracted 43%, 39% and 41% of Cu at 200, 400 and 600 mg Cu kg(-1) soil level, compared to initial Cu concentration. Therefore, study concluded that flax has a great potential to accumulate high concentration of Cu in its shoots and can be utilized as phytoremediation material when grown in Cu contaminated soils.
Studies on the removal of As(iii) by Fe-based materials have been carried out for decades, but the time-consuming process and low removal capacity are obstacles for large-scale practical applications. Here, a rapid and efficient technique was proposed for the removal of As(iii) using Cu-doped Fe@Fe2O3 core-shell nanoparticles (CFF) synthesized by a facile two-step reduction method and aging process, which realized a thorough removal of As(iii) from smelting wastewater at neutral pH within 30 min. The copper doped in CFF not only provided two extra oxygen reduction pathways to enhance the molecular oxygen activation, but also improved the electron transfer ability and removal efficiency of As(iii). The existence of copper contributed to the rapid oxidization and adsorption of As(iii), and the removal rate increased nearly 10-times in the aerobic system. Meanwhile, the proposed Cu-doped Fe@Fe2O3 core-shell nanoparticles and shifted oxygen reduction pathway could be easily scaled up for other transition metals, such as Ni. Molecular dynamics (MD) simulations based on the large-scale atomic/molecular massively parallel simulator (LAMMPS) were also employed to investigate the formation process of CFF. Furthermore, the removal efficiency of arsenic in smelting wastewater remained to be 90% after 6 times of cycling. Therefore, the distinctive oxidation activities of CFF hold great promise for applications in arsenic removal. Environmental significance Arsenic is one of the most toxic environmental pollutants and has aroused widespread concern. Fe- Based materials, especially nZVI, exhibit not only environmental friendliness but also excellent superior chemical stabilities and are widely applied in the water remediation field. We discovered that the presence of copper or nickel in Fe@ Fe2O3 can significantly improve the removal efficiency of As.III) by shifting the oxygen reduction pathway which will be conducive to oxidize highly toxic and refractory As(III) to lowly toxicity and easily removed As(V). Meanwhile, it also avoids secondary pollution by copper doping due to the unique core- shell structure. The findings provide a new perspective for the preparation of other transition metal doped Fe@ Fe2O3 materials for the remediation of environmental pollution.
Despite the knowledge about increasing discharge of silver nanoparticles (AgNPs) into wastewater and its potential toxicity to microorganisms, the interaction of AgNPs with heavy metals in the biological removal process remains poorly understood. This study focused on the effect of AgNPs (hydrodynamic diameter about 24.3 +/- 0.37 nm) on the removal of cadmium (Cd(II)) by using a model white rot fungus species, Phanerochaete chrysosporium. Results showed that the biological removal capacity of Cd(II) increased with the concentration of AgNPs increasing from 0.1 mg/L to 1 mg/L. The maximum removal capacity (4.67 mg/g) was located at 1 mg/L AgNPs, and then decreased with further increasing AgNPs concentration, suggesting that an appropriate concentration of AgNPs has a stimulating effect on the removal of Cd(II) by P. chrysosporium instead of an inhibitory effect. Results of Ag+ and total Ag concentrations in the solutions together with those of SEM and XRD demonstrated that added AgNPs had undergone oxidative dissolution and transported from the solution to the surface of fungal mycelia (up to 94%). FTIR spectra confirmed that amino, carboxyl, hydroxyl, and other reducing functional groups were involved in Cd(II) removal, AgNPs transportation, and the reduction of Ag+ to AgNPs. (C) 2014 Elsevier B.V. All rights reserved.
Human activities continue to increase the amount of carbon (C), nitrogen (N) and phosphorus (P) in lakes, which may cause serious environmental and human health problems. Global landscape of total organic C (TOC), N and P in lake water is still poorly known. Using a global data set that covers ∼8300 lakes from 68 countries/regions spanning six continents, we estimate that global mean concentrations and storage in lake water are 5.578 mg L-1 and 984.0 Tg for TOC, 0.526 mg L-1 and 92.8 Tg for TN, and 0.014 mg L-1 and 2.5 Tg for TP. These lake elements are significantly interrelated and in uneven distribution, being associated with morphological characteristics and climate conditions. We proposed that global C, N and P cycles should be considered as a whole in biogeochemical studies and policy-making related to environmental protection.
Nanoporous metals and nanoporous metal oxide-based materials are representative type of porous and nanosized structure materials. They have many excellent performances (e.g., unique pore structure, large clear surface area and high electrical conductivity) to be prodigiously promising potentials, for a variety of significant applications (e.g., energy storage, sensing and catalysis). Therefore, this review summarized the recent advances in the development of nanoporous metals/metal oxide-based materials, with special emphasis on superior electrochemical applications: supercapacitors, lithium ion batteries, sensing, electrocatalysis and photocatalysis. The significant and representative studies in each area are comprehensively reviewed and discussed as a reference for researchers working in related areas. We also outline the key challenges and future opportunities in this exciting field.
Materials with core-shell structures have attracted increasing attention in recent years due to their unique properties and wide applications in energy storage and conversion systems. Through reasonable adjustments of their shells and cores, various types of core-shell structured materials can be fabricated with favorable properties that play significant roles in energy storage and conversion processes. The core-shell material can provide an effective solution to the current energy crisis. Various synthetic strategies used to fabricate core-shell materials, including the atomic layer deposition, chemical vapor deposition and solvothermal method, are briefly mentioned here. A state-of-the -art review of their applications in energy storage and conversion is summarized. The involved energy storage includes supercapacitors, li-ions batteries and hydrogen storage, and the corresponding energy conversion technologies contain quantum dot solar cells, dye-sensitized solar cells, silicon/organic solar cells and fuel cells. In addition, the correlation between the core-shell structures and their performance in energy storage and conversion is introduced, and this finding can provide guidance in designing original core-shell structures with advanced properties.
The adsorbability on the carbonaceous cathode plays an important role in electro-Fenton systems but does not obtain enough attention. In this work, various carbon felts were obtained with different adsorption property by using the method of KOH activation at different temperatures to explore the influence of adsorption on the degradation efficiency of tetracycline (TC). The results of morphology characterization, nitrogen adsorption-desorption tests, XPS and FTIR analysis revealed that the surface area of carbon felt was improved, and the oxygen-containing functional groups on the surface were increased via KOH method with significantly enhanced adsorption capacity. In the batch experiment of TC electro-Fenton degradation, the carbon felt with better adsorption capacity tended to get higher degradation and mineralization efficiency. With the KOH activation process, CF-900 (carbon felt at 900 degrees C for 1h) exhibited the best TC adsorption property for the removal of TC within 30min (initial concentration: 80mg/L). Meanwhile, the constant of reaction rate for TC degradation at the CF-900 is 0.0648min(-1). It is higher than that (0.012min(-1)) obtained at the raw carbon felt ( approximately 5 times of enhancement). There are also synergistic effects between adsorption and degradation performance on some other organic pollutants. In addition, the degradation pathway was also studied by the methods of solid-phase extraction and high performance liquid chromatography-mass spectrometry (HPLC). From the obtained results, it is shown that good adsorbability is favorable for degradation in the homogeneous electro-Fenton system.