Synthesis, physical properties and application of the zero-valent iron/titanium dioxide heterocomposite having high activity for the sustainable photocatalytic removal of hexavalent chromium in water

AbstractChromium (Cr) is a common toxic heavy metal that is widely used in all kinds of industries, causing a series of environmental problems. Nanoscale zero- valent iron (nZVI) is considered to be an ideal remediation material for contaminated soil, especially for heavy metal pollutants. As a material of low toxicity and good activity, nZVI has been widely applied in the in situ remediation of soil hexavalent chromium (Cr(vi)) with mobility and toxicity in recent years. In this paper, some current technologies for the preparation of nZVI are summarized and the remediation mechanism of Cr(vi)-contaminated soil is proposed. Five classified modified nZVI materials are introduced and their remediation processes in Cr(vi)-contaminated soil are summarized. Key factors affecting the remediation of Cr(vi)-contaminated soil by nZVI are studied. Interaction mechanisms between nZVI-based materials and Cr(vi) are explored. This study provides a comprehensive review of the nZVI materials for the remediation of Cr(vi)-contaminated soil, which is conducive to reducing soil pollution.

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Synergistic effects of processing parameters on the biochemical and physical properties of tofu made from yellow field pea ( Pisum sativum ), as determined by response surface methodology

Food Science & Nutrition ◽

10.1002/fsn3.2091 ◽

2021 ◽

Author(s):

Kevin DePalma ◽

Brennan Smith ◽

Armando G. McDonald

Keyword(s):

Response Surface Methodology ◽

Pisum Sativum ◽

Physical Properties ◽

Response Surface ◽

Synergistic Effects ◽

Processing Parameters ◽

Field Pea

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Removal of hexavalent chromium from contaminated ground water using zero-valent iron nanoparticles

Environmental Monitoring and Assessment ◽

10.1007/s10661-011-2213-5 ◽

2011 ◽

Vol 184 (6) ◽

pp. 3643-3651 ◽

Cited By ~ 35

Author(s):

Ritu Singh ◽

Virendra Misra ◽

Rana Pratap Singh

Keyword(s):

Ground Water ◽

Hexavalent Chromium ◽

Iron Nanoparticles ◽

Zero Valent Iron ◽

Zero Valent Iron Nanoparticles

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INTEGRATING NANOSCALE ZERO-VALENT IRON AND TITANIUM DIOXIDE FOR NUTRIENT REMOVAL IN STORMWATER SYSTEMS

NANO ◽

10.1142/s1793292008001295 ◽

2008 ◽

Vol 03 (04) ◽

pp. 297-300 ◽

Cited By ~ 3

Author(s):

NI-BIN CHANG ◽

MARTY WANIELISTA ◽

FAHIM HOSSAIN ◽

LEI ZHAI ◽

KUEN-SONG LIN

Keyword(s):

Titanium Dioxide ◽

Water Reuse ◽

Algal Blooms ◽

Chemical Reduction ◽

Nitrate Removal ◽

Packed Bed ◽

The United States ◽

Zero Valent Iron ◽

Nanoscale Zero Valent Iron ◽

Freshwater Bodies

Nutrients, such as nitrate, nitrite, and phosphorus, are common contaminants in many aquatic systems in the United States. Ammonia and nitrate are both regulated by the drinking water standards in the US primarily because excess levels of nitrate might cause methemoglobinemia. Phosphorus might become sources of the eutrophication problems associated with toxic algae in the freshwater bodies. Toxic algal blooms can cause severe acute and chronic public health problems. Chemical reduction of nitrate by using zero-valent iron started as early as 1964, and considerable research reports relating to this technology to nanomaterial were extensively reported in 1990s making the use of nanoscale zero-valent iron (NZVI) particles for nitrate removal become one of the most popular technologies in this field. The purpose of the present study was to examine the potential of integrating green sorption media, such as sawdust, limestone, tire crumb, and sand/silt, with two types of nanoparticles, including NZVI and Titanium Dioxide ( TiO 2), for nitrate removal in an engineering process. The study consists of running packed bed column tests followed by the addition of NZVI and TiO 2 to improve nitrate and phosphorus removal efficiency. Preliminary results in this paper show that the potential and advanced study may support the creation of design criteria of stormwater and groundwater treatment systems for water reuse in the future.

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