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Junxian Shi, Wenyan Zhao, Chang Liu, Tao Jiang and Hongrui Ding
Here we reported the investigation of enhanced performance for the removal of hexavalent chromium (Cr (VI)) by a new microbial fuel cell (MFC) with natural pyrrhotite-coated cathode. By comparisons of the graphite-cathode, the MFCs equipped with a pyrrho...
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Margarethe Langer, Mohammad Umair Jamal, Amanda Conklin and Mathias Ernst
Cr(VI) is toxic and carcinogenic, which fuels discussions on reducing existing standards for maximum Cr concentrations in drinking water. Fe(II) reductive precipitation is a common and economical method for achieving very low Cr(tot) concentrations (<5 µ...
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Lorena Alcaraz, Francisco J. Alguacil and Félix A. López
A winemaking waste was used as a precursor of activated carbon used for the removal of hazardous Cr(VI) from solutions. The preparation process consisted of a hydrothermal process and a chemical activation of the resulting product, with KOH. The adsorpti...
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Anna Gröhlich, Margarethe Langer, Manassis Mitrakas, Anastasios Zouboulis, Ioannis Katsoyiannis, Mathias Ernst
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Due to its toxicity, Cr(VI) is undesirable in groundwater. Its chemical reduction to Cr(III) species, followed by precipitation is the most widely practiced treatment technique for the removal of Cr(VI) from polluted waters. The resulting Cr(III) species...
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Mihaela Dinu, Emile S. Massima Mouele, Anca C. Parau, Alina Vladescu, Leslie F. Petrik and Mariana Braic
Chromium nitride and oxynitride coatings were deposited as monolayers ((Cr?N), Cr(N,O)) and bilayers (Cr?N/Cr(N,O), Cr(N,O)/Cr?N) on 304 steel substrates by reactive cathodic arc method. The coatings were characterised by X-ray diffraction (XRD), scannin...
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Xiaolong Pan, Longshi Qiu, Xiaogang Hu and Haixia Jiang
In this study, duplex surface treatments were used to prepare a ZrO2/Cr bilayer coating on zirconium alloy cladding for enhancing the wear and corrosion behaviors. The surface and cross-section morphology of coated Zr-4 alloy was characterized; the resul...
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James E. Krzanowski and Daniel J. Foley
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Upekha Mandakini Lenaduwa Lokuge
Heavy metal contamination in aquatic environments has become one of the major environmental problems all over the world. Phytoremediation is a plant based technology that utilizes special plants known as hyperaccumulators to purify heavy metal contaminat...
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Zhipeng Cheng, Lanfang Bai, Zhen Wang, Fugui Wang, Yukai Wang, Hongwei Liang, Yongqiang Wang, Meiren Rong and Zhigang Wang
The two major concerns of sustainable agriculture are safeguarding food security and reducing greenhouse gas emissions. Studies on the performance of strip-till with controlled-release blended fertilizer on rainfed maize grain yield, greenhouse gas emiss...
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Yan Shu, Chunfang Tang, Xinjiang Hu, Luhua Jiang, Xi Hu and Yunlin Zhao
In this study, Box?Behnken design (BBD) was employed to optimize the process for H3PO4-activated Typha angustifolia activated carbon (TAC) production and Cr removal by TAC; the removal mechanisms were discussed based on TAC characterization, and the rege...
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Marta Ribeiro, Joost Ellerbroek and Jacco Hoekstra
Future high traffic densities with drone operations are expected to exceed the number of aircraft that current air traffic control procedures can control simultaneously. Despite extensive research on geometric CR methods, at higher densities, their perfo...
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Xinliang Xu, Ying Fu and Shuang Li
China has abundant crop residues (CRE) that could be used for bioenergy. The spatiotemporal characteristics of bioenergy production are crucial for high-efficiency use and appropriate management of bioenergy enterprises. In this study...
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Fangfang Wang, Qiushi Li, Lijing Zheng, Fengxiang Zhang and Hu Zhang
For present and future advanced aerospace bearing applications, it is significant and necessary to improve the corrosion resistance of carburized CSS-42L steel. In this study, Cr films of about 1 μm in thickness were fabricated onto carburized CSS-42L...
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Yaneth Vasquez, Jair Franco, Mario Vasquez, Felipe Agudelo, Eleni Petala, Jan Filip, Jose Galvis and Oscar Herrera
The tannery wastewater from the tanning stage (TWT) comprises organic and Cr pollutants, which can adversely affect aquatic life and have carcinogenic effects. In this study, we investigated the performance of a Fenton-like process using commercial Nano-...
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Khizar Hussain Shah, Noor S. Shah, Gul Afshan Khan, Sadaf Sarfraz, Jibran Iqbal, Aneeqa Batool, Ahmad Jwuiyad, Shabnam Shahida, Changseok Han and Monika Wawrzkiewicz
This study focuses on investigating and comparing the influence of the surface functional groups and chemical matrices of macroporous resin on the Cr(III) exchange mechanism. The results discussed herein indicate that sulfonic resin removed Cr(III) ions ...
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Patricia Kara De Maeijer, Bart Craeye, Johan Blom and Lieven Bervoets
This state-of-the-art review was aimed to conduct a comprehensive literature survey to summarize experiences of crumb rubber (CR) application in concrete within the last 30 years. It shows that certain gaps prevent obtaining a coherent overview of both m...
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Haibo Liu, Cunlin Xin, Lei Liu and Chunqiang Zhuang
The structural stability of high-entropy alloys (HEAs) is closely related to their mechanical properties. The precise control of the component content is a key step toward understanding their structural stability and further determining their mechanical ...
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Gennaro A. Stefania, Marco Rotiroti, Letizia Fumagalli, Chiara Zanotti and Tullia Bonomi
This work presents the numerical modeling of remediation scenarios aimed at containing and attenuating the groundwater pollution by Cr(VI) sourced from a steelworks area that affects the Alpine aquifer system in the Aosta Plain (N Italy). Here, groundwat...
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Maria Economou-Eliopoulos, Ifigeneia Megremi, Cathy Atsarou, Christina Theodoratou and Charalambos Vasilatos
The investigation of the contamination in soil, plants and groundwater revealed a spatial evolution, with an increasing trend in the Cr, Fe, Ni, Mn and Co contents in soils from the Assopos to Thiva basin, followed by C. Evia and Ni-laterite deposits, su...
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Tao Wang, Yifan Wang, Qi Cheng, Shouming Yu and Guojun Zhang
CrNx coatings with a low nitrogen content below 31.7 at.% were deposited using closed field unbalanced magnetron sputtering by varying the N2:Ar flow ratio. A dense and column-free CrNx coating was obtained at a nitrogen content of 14.8 at.%, whereas the...
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