Author
Hao Peng
Bio: Hao Peng is an academic researcher from Yangtze Normal University. The author has contributed to research in topics: Chromium & Vanadium. The author has an hindex of 11, co-authored 35 publications receiving 361 citations.
Topics: Chromium, Vanadium, Leaching (metallurgy), Adsorption, Nonthermal plasma
Papers
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TL;DR: In this article, the authors review aqueous chromium species, their toxicity and methods to remove Cr such as membrane filtration, chemical precipitation, ion exchange, adsorption electrocoagulation, electrochemical reduction, electrodialysis, electrodeionization, photocatalysis and nanotechnology.
Abstract: Chromium is a potentially toxic and carcinogenic metal originating from natural processes and anthropogenic activities such as the iron steel, electroplating and leather industries. Therefore, chromium should be removed from wastewater to avoid environmental pollution and to recycle chromium in the context of the future circular economy. Here we briefly review aqueous Cr species, their toxicity and methods to remove Cr such as membrane filtration, chemical precipitation, ion exchange, adsorption electrocoagulation, electrochemical reduction, electrodialysis, electrodeionization, photocatalysis and nanotechnology.
241 citations
TL;DR: Results indicated that carbonate precipitation prior to the other two methods for removal of manganese and ammonia nitrogen showed superior efficiency and economic evaluation reveals that the treatment cost was 9.316 $ m-3 when carbonate and phosphate was used to remove manganes and ammonia ammonia nitrogen from EMMRL.
130 citations
TL;DR: Wang et al. as mentioned in this paper have focused on recovering vanadium from vanadium titano-magnetite and stone coal as they were the main vanadium resources in China, and much intensive research work was needed.
Abstract: Vanadium as an important national strategy resource is widely used in many fields due to its excellent physicochemical properties. Much attention had been focused on recovering vanadium from vanadium titano-magnetite and stone coal as they were the main vanadium resources in China. Sodium roasting technology was the earliest technology applied in recovering vanadium, high recovery efficiency of vanadium was obtained along with serious environment problem like corrosive gases and hazardous wastewater. Calcium roasting technology avoided above problems, but high energy-cost and low recovery was remained. Non-salt roasting technology was suitable for limited vanadium resource. Vanadium was leached out after roasting and the leaching medium was divided into three parts according to the roasting technology. Recover process of vanadium depended on the vanadium species and pH in the leaching solution. Hydrolysis was the easily technology with most impurities. Ammonium precipitation was the common process for every technology. And high purity of V2O5 was obtained by calcining precipitation of recovery process. Overall, the industry of vanadium leaching was still underdeveloped, and much intensive research work was needed.
74 citations
TL;DR: In this article, the effects of parameters on the precipitation efficiency of chromium including reaction temperature, reaction time, and initial pH of solution and dosage of lead sulfate were investigated and it was shown that the initial pH and dosage had big influence while reaction time and reaction temperature had little.
Abstract: Lead sulfate was chose to precipitate chromium (VI) based on the difference of the solubility between lead sulfate and lead chromate. The effects of parameters on the precipitation efficiency of chromium including reaction temperature, reaction time, and initial pH of solution and dosage of lead sulfate were investigated. Results showed that the initial pH of solution and dosage of lead sulfate had big influence while reaction time and reaction temperature had little. The concentration of chromium (VI) could reduce from 0.2 mol/L to 0.0015 mmol/L (0.08 mg/L) at pH value of 13.90 and the dosage of lead sulfate as n (PbSO4)/n (K2CrO4) = 4. The XRD result of precipitation was consistent with the result predicted by Visual MINTEQ software and the precipitation was composed of PbCrO4, PbSO4 and other oxides containing lead. Otherwise, XRF and ICP were used to analyze the residual lead (II) in the filtrate and results indicated that the concentration of Pb (II) in the filtrate was acceptable.
37 citations
TL;DR: In this article, Ga2S3 and sulfur co-modified biochar (Ga/S-BC) composites were prepared for enhancing the adsorption of ciprofloxacin from sugarcane bagasse via the high-temperature sulfurization.
37 citations
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TL;DR: In this article, the authors discuss some of the most recent and relevant findings related to the release of heavy metals, the possible risks for the environment and human health, the materials and technologies available for their removal.
Abstract: Water pollution is one of the global challenges that society must address in the 21st century aiming to improve water quality and reduce human and ecosystem health impacts. Industrialization, climate change, and expansion of urban areas produce a variety of water pollutants. In this work, we discuss some of the most recent and relevant findings related to the release of heavy metals, the possible risks for the environment and human health, the materials and technologies available for their removal. Anthropogenic activities are identified as the main source of the increasing amounts of heavy metals found in aquatic environments. Some of the health hazards derived from repeated exposure to traces of heavy metals, including lead, cadmium, mercury, and arsenic, are outlined. We also give some perspectives about several techniques used to detect heavy metals, as well as about the factors that could affect the contaminant removal. The advantages and drawbacks of conventional and non-conventional heavy metal removal methods are critically discussed, given particular attention to those related to adsorption, nanostructured materials and plant-mediated remediation. Some of the commercial products currently used to eliminate heavy metals from water are also listed. Finally, we point out some the requirements and opportunities linked to developing efficient methods for heavy metal removal, such as the ones that exploit nanotechnologies.
294 citations
TL;DR: In this article, the authors review aqueous chromium species, their toxicity and methods to remove Cr such as membrane filtration, chemical precipitation, ion exchange, adsorption electrocoagulation, electrochemical reduction, electrodialysis, electrodeionization, photocatalysis and nanotechnology.
Abstract: Chromium is a potentially toxic and carcinogenic metal originating from natural processes and anthropogenic activities such as the iron steel, electroplating and leather industries. Therefore, chromium should be removed from wastewater to avoid environmental pollution and to recycle chromium in the context of the future circular economy. Here we briefly review aqueous Cr species, their toxicity and methods to remove Cr such as membrane filtration, chemical precipitation, ion exchange, adsorption electrocoagulation, electrochemical reduction, electrodialysis, electrodeionization, photocatalysis and nanotechnology.
241 citations
TL;DR: Chromium pollution is a significant environmental threat, severely impacting our environment and natural resources, especially water and soil, and a sustainable remediation approach must be adopted to balance the environment and nature.
156 citations
TL;DR: In this article , a carnation flower-like Bi2O2CO3 hierarchical structure was synthesized via a hydrothermal route and its photocatalytic activity was investigated by simulated-sunlight driving photoreduction of Cr(VI).
114 citations
TL;DR: A review of the most recent developments in the use of biological based techniques to remove dyes and heavy metals from wastewater is presented in this article, where various microorganisms such as algae, bacteria, fungi and enzymes are depicted in detail.
114 citations