Author
Yanhui Guo
Other affiliations: Georgia Institute of Technology
Bio: Yanhui Guo is an academic researcher from Henan Normal University. The author has contributed to research in topics: Zerovalent iron & Aqueous solution. The author has an hindex of 2, co-authored 3 publications receiving 502 citations. Previous affiliations of Yanhui Guo include Georgia Institute of Technology.
Papers
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TL;DR: Batch experiments suggest that the decolorization efficiency was enhanced with the increase of NZVI dosage and reaction temperature, but decreased with increasing initial dye concentration and initial solution pH, and studies indicated that existence of inorganic salt could inhibit thedecolorization of MO.
509 citations
TL;DR: In this article, the removal of nitrite by ultrasound-dispersed nanoscale zerovalent iron (NZVI) particles was investigated, and the derived activation energy of NZVI-based nitrite reduction was 31.44 kJ·mol−1.
Abstract: This research focuses on the removal of nitrite by ultrasound-dispersed nanoscale zerovalent iron (NZVI) particles. The factors affecting the removal of nitrite, namely, the length of ultrasonication time, the dosage of NZVI, the initial nitrite concentration, the temperature, and the solution pH, were investigated. Kinetics studies revealed that the denitrification process is a pseudo-first-order reaction with respect to the concentration of nitrite under the given experimental conditions. The derived activation energy of NZVI-based nitrite reduction is 31.44 kJ·mol−1.
52 citations
Patent•
23 Jul 2008
TL;DR: In this paper, a molecular imprint solid-phase extracting agent which can effectively extract diphenyl guanidine from an enriched environmental sample is presented. But the method is not suitable for the extraction of biomolecular imprints.
Abstract: A preparation method of a diphenyl guanidine molecular imprint solid-phase extracting agent relates to a preparation method of solid-phase extracting agent; the invention aims at providing a preparation method of molecular imprint solid-phase extracting agent which can effectively extract diphenyl guanidine from an enriched environmental sample. The technical proposal of the invention has the key points that: (1) diphenyl guanidine, methacrylic acid and ethylene glycol dimethacrylate are blended with the mol ratio of 1:4:20; the diphenyl guanidine is firstly added into a chloroform for dissolving, then the methacrylic acid is added to act with the diphenyl guanidine completely, after that, the ethylene glycol dimethacrylate and an azoisobutyronitrile are added in sequence, and the solution is communicated with nitrogen by ultrasonic and heated up to 55-60 DEG C for polymerization reaction; (2) the block polymer is prepared into a granular polymer which is soxhlet extracted by 10% of glacial acetic acid/ methanol solution; (3) the soxhlet extract product is washed by methanol until the washing agent shows neutral, and the diphenyl guanidine molecular imprint solid-phase extracting agent of the invention is obtained after vacuum drying. The invention is used for extracting diphenyl guanidine from an enriched environmental sample.
1 citations
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TL;DR: The fundamental importance of being able to accurately predict the long-term physical, chemical and biological fate of contaminated sites following nZ VI treatment is emphasised and, as part of this, a universal empirical testing framework for nZVI is suggested.
1,010 citations
TL;DR: Research shows that NZVI-based materials have satisfactory removal capacities for heavy metal ions and play an important role in the environmental pollution cleanup.
Abstract: The presence of heavy metals in the industrial effluents has recently been a challenging issue for human health. Efficient removal of heavy metal ions from environment is one of the most important issues from biological and environmental point of view, and many studies have been devoted to investigate the environmental behavior of nanoscale zerovalent iron (NZVI) for the removal of toxic heavy metal ions, present both in the surface and underground wastewater. The aim of this review is to show the excellent removal capacity and environmental remediation of NZVI-based materials for various heavy metal ions. A new look on NZVI-based materials (e.g., modified or matrix-supported NZVI materials) and possible interaction mechanism (e.g., adsorption, reduction and oxidation) and the latest environmental application. The effects of various environmental conditions (e.g., pH, temperature, coexisting oxy-anions and cations) and potential problems for the removal of heavy metal ions on NZVI-based materials with the...
898 citations
TL;DR: In this paper, the performances of traditional technologies and nanotechnology for water treatment and environmental remediation were compared with the goal of providing an up-to-date reference on the state of treatment techniques for researchers, industry, and policy makers.
582 citations
TL;DR: In this paper, the BaTiO3 nanowires and nanoparticles were synthesized and their piezocatalytic activity was investigated and it was shown that the intrinsic charge carriers in piezoelectric crystallites play the role of charge transfer in the catalysis process through regulating the concentration of charge carriers.
381 citations
15 Nov 2011
TL;DR: Kinetics studies showed that the degradation of MO fitted well to the pseudo first-order model, including the following: oxidation of iron, adsorption of MO to B-nZVI, formation of Fe(II)-dye complex, and cleavage of azo bond.
Abstract: Zero-valent iron (ZVI) nanoparticles tend to agglomerate, resulting in a significant loss in reactivity. To address this issue, synthesized bentonite-supported nanoscale zero-valent iron (B-nZVI) was used to remove azo dye methyl orange (MO) in aqueous solution. Batch experiments show that various parameters, such as pH, initial concentration of MO, dosage, and temperature, were affected by the removal of MO. Scanning electron microscopy (SEM) confirmed that B-nZVI increased their reactivity and a decrease occurred in the aggregation of iron nanoparticles for the presence of bentonite (B). Using B-nZVI, 79.46% of MO was removed, whereas only 40.03% when using nZVI after reacting for 10 min with an initial MO concentration of 100 mg/L (pH = 6.5). Furthermore, after B-nZVI reacted to MO, XRD indicated that iron oxides were formed. FTIR showed that no new bands appeared, and UV–vis demonstrated that the absorption peak of MO was degraded. Kinetics studies showed that the degradation of MO fitted well to the pseudo first-order model. A degradation mechanism is proposed, including the following: oxidation of iron, adsorption of MO to B-nZVI, formation of Fe(II)–dye complex, and cleavage of azo bond. Finally, the removal rate of MO from actual wastewater was 99.75% when utilizing B-nZVI.
340 citations