Bioconversion of Crude Glycerol into 1,3-Propanediol(1,3-PDO) with Bioelectrochemical System and Zero-Valent Iron Using Klebsiella pneumoniae L17

Crude glycerol is a major byproduct in the production of biodiesel and contains a large number of impurities. The transformation of crude glycerol into valuable compounds such as 1,3-propanediol (1,3-PDO) using clean and renewable processes, like bioconversion, is an important task for the future of the chemical industry. In this study, 1,3-PDO bioproductions from crude and pure glycerol were estimated as 15.4 ± 0.8 and 11.4 ± 0.1 mmol/L, respectively. Because 1,3-PDO is a reductive metabolite that requires additional reducing energy, external supplements of electron for further improvement of 1,3-PDO biosynthesis were attempted using a bioelectrochemical system (BES) or zero-valent iron (ZVI). The conversions of crude and pure glycerol under electrode and iron-based cultivation were investigated for 1,3-PDO production accompanied by metabolic shift and cell growth. The BES-based conversion produced 32.6 ± 0.6 mmol/L of 1,3-PDO with ZVI implementation.

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Nano zero-valent iron harms methanogenic archaea by interfering with energy conservation and methanogenesis

Environmental Science Nano ◽

10.1039/d1en00621e ◽

2021 ◽

Author(s):

Yuanxu Song ◽

Liangfeng Duan ◽

Kaifeng Du ◽

Chao Song ◽

Shan Zhao ◽

...

Keyword(s):

Oxidative Damage ◽

Energy Conservation ◽

Methanogenic Archaea ◽

Zero Valent Iron ◽

Pollutant Remediation ◽

Nano Zero Valent Iron ◽

Iron Based

Iron-based nanoparticles (Fe-NPs), often applied for pollutant remediation, inevitably interact with various organisms either directly or indirectly. The well-acknowledged toxicological mechanisms for Fe-NPs on organisms are causing oxidative damage and...

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Recyclable nanoscale zero-valent iron-based magnetic polydopamine coated nanomaterials for the adsorption and removal of phenanthrene and anthracene

Science and Technology of Advanced Materials ◽

10.1080/14686996.2016.1246941 ◽

2017 ◽

Vol 18 (1) ◽

pp. 3-16 ◽

Cited By ~ 24

Author(s):

Jing Li ◽

Qingxiang Zhou ◽

Yongli Liu ◽

Man Lei

Keyword(s):

Zero Valent Iron ◽

Nanoscale Zero Valent Iron ◽

Iron Based

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New Perspectives on Iron-Based Nanostructures

Processes ◽

10.3390/pr8091128 ◽

2020 ◽

Vol 8 (9) ◽

pp. 1128

Author(s):

Seyedeh-Masoumeh Taghizadeh ◽

Aydin Berenjian ◽

Marziyeh Zare ◽

Alireza Ebrahiminezhad

Keyword(s):

Pure Iron ◽

Human Life ◽

Zero Valent Iron ◽

Iron Hydroxides ◽

Human Beings ◽

Iron Iron ◽

Iron Based ◽

Forms Of Iron ◽

Structure Properties

Among all minerals, iron is one of the elements identified early by human beings to take advantage of and be used. The role of iron in human life is so great that it made an era in the ages of humanity. Pure iron has a shiny grayish-silver color, but after combining with oxygen and water it can make a colorful set of materials with divergent properties. This diversity sometimes appears ambiguous but provides variety of applications. In fact, iron can come in different forms: zero-valent iron (pure iron), iron oxides, iron hydroxides, and iron oxide hydroxides. By taking these divergent materials into the nano realm, new properties are exhibited, providing us with even more applications. This review deals with iron as a magic element in the nano realm and provides comprehensive data about its structure, properties, synthesis techniques, and applications of various forms of iron-based nanostructures in the science, medicine, and technology sectors.

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Selective Oxidation of Crude Glycerol to Dihydroxyacetone in a Biphasic Photoreactor

Catalysts ◽

10.3390/catal10040360 ◽

2020 ◽

Vol 10 (4) ◽

pp. 360

Author(s):

Alexander Luis Imbault ◽

Ramin Farnood

Keyword(s):

Ethyl Acetate ◽

Selective Oxidation ◽

Crude Glycerol ◽

Water Mixture ◽

Pure Glycerol ◽

Water Ratio

In this paper, the first biphasic photoreactor was introduced and utilized for the conversion of glycerol to glyceraldehyde (GAD) and dihydroxyacetone (DHA) using water and ethyl acetate as dispersed (active) and continuous (inactive) phases, respectively. Increasing the ethyl acetate content in the reactor improved the DHA yield; however, the optimal DHA selectivity was obtained at an ethyl acetate to water ratio of 90:10 (vol/vol). Compared to a monophasic photoreactor containing only water and identical amounts of glycerol and photocatalyst, the biphasic reactor containing 90 vol % ethyl acetate increased the DHA yield by a factor of 2.9 (from 4.5% to 13%) and the concentration of DHA by approximately 14 times (from 0.08 mM to 1.1 mM) after 240 min. Additionally, photocatalytic conversion of crude glycerol extracted using a 90:10 (vol/vol) ethyl acetate-water mixture showed a similar DHA conversion and yield to that of pure glycerol.

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Ultrasonic Enhanced Zero-Valent Iron-Based Fenton Reaction for Ciprofloxacin Removal under Aerobic Condition

Environmental Processes ◽

10.1007/s40710-019-00415-5 ◽

2019 ◽

Vol 7 (1) ◽

pp. 227-241 ◽

Cited By ~ 1

Author(s):

Meghdad Pirsaheb ◽

Sajad Moradi ◽

Mohsen Shahlaei ◽

Xiangke Wang ◽

Negin Farhadian

Keyword(s):

Fenton Reaction ◽

Aerobic Condition ◽

Zero Valent Iron ◽

Iron Based ◽

Ciprofloxacin Removal

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A biomimetic strategy for improving activity of nano zero-valent iron based on the adhesive behavior of polydopamine on PVDF·Al2O3 film

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2017.04.071 ◽

2017 ◽

Vol 197 ◽

pp. 215-225 ◽

Cited By ~ 7

Author(s):

Xiangyu Wang ◽

Shan Cong ◽

Jun Ma

Keyword(s):

Zero Valent Iron ◽

Nano Zero Valent Iron ◽

Iron Based

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Exogenous l-proline improved Rhodosporidium toruloides lipid production on crude glycerol

Biotechnology for Biofuels ◽

10.1186/s13068-020-01798-6 ◽

2020 ◽

Vol 13 (1) ◽

Author(s):

Rasool Kamal ◽

Yuxue Liu ◽

Qiang Li ◽

Qitian Huang ◽

Qian Wang ◽

...

Keyword(s):

Cell Growth ◽

Lipid Content ◽

Crude Glycerol ◽

Oleaginous Yeast ◽

Lipid Production ◽

Rhodosporidium Toruloides ◽

Biodiesel Production ◽

Lipid Yield ◽

Stress Agent ◽

Glycerol Consumption

Abstract Background Crude glycerol as a promising feedstock for microbial lipid production contains several impurities that make it toxic stress inducer at high amount. Under stress conditions, microorganisms can accumulate l-proline as a safeguard. Herein, l-proline was assessed as an anti-stress agent in crude glycerol media. Results Crude glycerol was converted to microbial lipids by the oleaginous yeast Rhodosporidium toruloides CGMCC 2.1389 in a two-staged culture mode. The media was supplied with exogenous l-proline to improve lipid production efficiency in high crude glycerol stress. An optimal amount of 0.5 g/L l-proline increased lipid titer and lipid yield by 34% and 28%, respectively. The lipid titer of 12.2 g/L and lipid content of 64.5% with a highest lipid yield of 0.26 g/g were achieved with l-proline addition, which were far higher than those of the control, i.e., lipid titer of 9.1 g/L, lipid content of 58% and lipid yield of 0.21 g/g. Similarly, l-proline also improved cell growth and glycerol consumption. Moreover, fatty acid compositional profiles of the lipid products was found suitable as a potential feedstock for biodiesel production. Conclusion Our study suggested that exogenous l-proline improved cell growth and lipid production on crude glycerol by R. toruloides. The fact that higher lipid yield as well as glycerol consumption indicated that l-proline might act as a potential anti-stress agent for the oleaginous yeast strain.

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Activated persulfate by iron-based materials used for refractory organics degradation: a review

Water Science & Technology ◽

10.2166/wst.2020.190 ◽

2020 ◽

Vol 81 (5) ◽

pp. 853-875 ◽

Cited By ~ 1

Author(s):

Yanjiao Gao ◽

Pascale Champagne ◽

David Blair ◽

Ouwen He ◽

Tiehong Song

Keyword(s):

Transition Metals ◽

Advanced Oxidation Processes ◽

Ferric Iron ◽

Operating Conditions ◽

Zero Valent Iron ◽

Practical Application ◽

Treatment Research ◽

Iron Based ◽

Materials Used ◽

Refractory Organics

Abstract Recently, the advanced oxidation processes (AOPs) based on sulfate radicals (SRs) for organics degradation have become the focus of water treatment research as the oxidation ability of SRs are higher than that of hydroxyl radicals (HRs). Since the AOP-SRs can effectively mineralize organics into carbon dioxide and water under the optimized operating conditions, they are used in the degradation of refractory organics such as dyes, pesticides, pharmaceuticals, and industrial additives. SRs can be produced by activating persulfate (PS) with ultraviolet, heat, ultrasound, microwave, transition metals, and carbon. The activation of PS in iron-based transition metals is widely studied because iron is an environmentally friendly and inexpensive material. This article reviews the mechanism and application of several iron-based materials, including ferrous iron (Fe2+), ferric iron (Fe3+), zero-valent iron (Fe0), nano-sized zero-valent iron (nFe0), materials-supported nFe0, and iron-containing compounds for PS activation to degrade refractory organics. In addition, the current challenges and perspectives of the practical application of PS activated by iron-based systems in wastewater treatment are analyzed and prospected.

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