Simultaneous removal of cadmium and nitrate in aqueous media by nanoscale zerovalent iron (nZVI) and Au doped nZVI particles

Su, Yiming; Adeleye, Adeyemi S.; Huang, Yuxiong; Sun, Xiaoya; Dai, Chaomeng; Zhou, Xuefei; Zhang, Yalei; Keller, Arturo A.

doi:10.1016/j.watres.2014.06.008

Cited by 181 publications

(80 citation statements)

References 58 publications

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“…The remaining filtrate fraction was digested and analyzed for total dissolved copper ([Cu] diss ) via ICP-AES, as described previously. 12,22 Complexed cupric ion (c-Cu 2+ ) in CuO and Kocide was determined by mass balance: [Cu] diss − f-Cu 2+ . Since nano-Cu may also form some Cu + , the mass balance yielded non-f-Cu 2+ species.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Influence of Extracellular Polymeric Substances on the Long-Term Fate, Dissolution, and Speciation of Copper-Based Nanoparticles

Adeleye

Conway

Pérez

et al. 2014

Environ. Sci. Technol.

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ABSTRACT:The influence of phytoplankton-derived soluble extracellular polymeric substances (EPS), pH, and ionic strength (IS) on the dissolution, speciation, and stability of nano-CuO, nano-Cu, and Kocide (a micron sized Cu(OH) 2 -based fungicide) was investigated over 90 days. EPS improved the stability of commercial copper-based nanoparticles (CBNPs) in most conditions, in addition to influencing their dissolution. The dissolution rate was pH 4 ≫ pH 7 > pH 11. The presence of EPS correlated with higher dissolved Cu at pH 7 and 11, and lower dissolved Cu at pH 4. More dissolution was observed at higher IS (NaCl) due to complexation with Cl − . Dissolution of nano-CuO at pH 7 increased from 0.93% after 90 days (without EPS) to 2.01% (with 5 mg-C EPS/L) at 10 mM IS. Nano-CuO dissolved even more (2.42%) when IS was increased to 100 mM NaCl (with EPS). The ratio of freeCu 2+ /total dissolved Cu decreased in the presence of EPS, or as pH and/or IS increased. On a Cu mass basis, Kocide had the highest dissolved and suspended Cu at pH 7. However, dissolution of nano-Cu resulted in a higher fraction of free Cu 2+ , which may make nano-Cu more toxic to pelagic organisms. ■ INTRODUCTIONGlobal production of copper-based nanoparticles (CBNPs) was estimated at ∼200 t/yr in 2010, and is increasing. 1 CBNPs have found use in cosmetics, pigments, paints and coatings, electronics, and pesticides. 2−4 These applications may lead to direct exposure of CBNPs to the environment due to normal use, product wear-and-tear, and/or end-of-life disposal. 1 Toxicity of CBNPs and composites to organisms has been demonstrated. 2,5−8 It is therefore important to understand the long-term fate and transformations of these materials in aquatic systems in order to predict exposure to at-risk organisms.Stability and dissolution of engineered nanoparticles (ENPs) depend on ionic strength (IS), pH, and natural organic material (NOM). 9−12 Rapid aggregation of nano-Cu was reported in freshwater by Griffitt et al. 5 The authors also found that less than 0.1% of the nano-Cu dissolved in 48 h in the freshwater media used (pH 8.2). 98% dissolution of nano-Cu was however reported at pH 6 in "uterine-fluid" after a week, 13 demonstrating the importance of pH and media composition on CBNPs' dissolution. Mudunkotuwa and co-workers 14 reported increased dissolution of aged and new CBNPs in the presence of organic acids. Similarly, Worthington et al. 15 showed that the chitosan improved stability and dissolution of nano-Cu. To our knowledge, no studies have previously investigated the effects of naturally occurring NOM such as extracellular polymeric substances (EPS) on the stability and dissolution of CBNPs. EPS are synthesized by microorganisms, which are abundant in natural aquatic systems. EPS are mainly composed of polysaccharides, proteins, nucleic acids, and other polymers; and their composition may vary spatially and temporally even within the same species. 16 EPS may interact with ENPs, thus affecting their fate and transformation. 17 Additional...

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Influence of Extracellular Polymeric Substances on the Long-Term Fate, Dissolution, and Speciation of Copper-Based Nanoparticles

Adeleye

Conway

Pérez

et al. 2014

Environ. Sci. Technol.

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211

217

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“…We demonstrate the effectiveness of FeSSi as an environmental remediator and the strength of our quantitative model of the mitigation of nanoparticle toxicity by algal-produced organic material. KEYWORDS: sulfidized nano-iron, remediation, nanotoxicity, algae, ecological modeling N anozerovalent iron (nZVI) and its derivatives are currently the most commonly applied technology for nano-enabled remediation 1−4 and can remove a wide array of metals and organic compounds in the laboratory 5,6 and in the field. 7−9 nZVI-based nanoremediation technology is appealing both because of its high reactivity and because it can be applied in situ, without the need for excavation and/or waste disposal.…”

Section: * S Supporting Informationmentioning

confidence: 99%

Remediation of Cadmium Toxicity by Sulfidized Nano-Iron: The Importance of Organic Material

Stevenson

Adeleye

et al. 2017

ACS Nano

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Nanozerovalent iron (nZVI) is widely used for its ability to remove or degrade environmental contaminants. However, the effect of nZVI-pollutant complexes on organisms has not been tested. We demonstrate the ability of a sulfidized derivative of nZVI (FeSSi) to sorb cadmium (Cd) from aqueous media and alleviate Cd toxicity to a freshwater alga for 32 days. FeSSi particles removed over 80% of the aqueous Cd in the first hour and nearly the same concentration of free Cd remained unbound at the end of the experiment. We found that FeSSi particles with Cd sorbed onto them are an order of magnitude more toxic than FeSSi alone. Further, algal-produced organic material facilitates safer remediation of Cd by FeSSi by decreasing the toxicity of FeSSi itself. We developed a dynamic model to predict the maximum Cd concentration FeSSi can remediate without replacing Cd toxicity with its own. FeSSi can remediate four times as much Cd to phytoplankton populations when organic material is present compared to the absence of organic material. We demonstrate the effectiveness of FeSSi as an environmental remediator and the strength of our quantitative model of the mitigation of nanoparticle toxicity by algal-produced organic material.

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“…Persistent organic pollutants (POPs) such as polycyclic aromatic hydrocarbons (PAHs) and potentially toxic metal ions (Hübner et al, 2010) such as cadmium (Cd), pose a significant threat to public health and the environment due to their high toxicity and long persistence Su et al, 2014;Su et al, 2016;Su et al, 2015;Vela et al, 2012). Numerous sites are contaminated by both PAHs and heavy metals, including e-wasting processing sites (Luo et al, 2011), manufactured gas plant sites (Thavamani et al, 2012), and river sediments (Feng et al, 2012), which require simultaneous remediation of PAHs and heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of PAHs and metal contaminants from water using magnetic nanoparticle adsorbents

Huang

Fulton

Keller

2016

Science of The Total Environment

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• Fast magnetic nanosorbents for simultaneous removal of PAHs and metals • Stable remediation performance across wide pH range (4-9) • High water hardness resistance across wide range of Ca 2 + or Mg 2 + concentration • Low energy use for regeneration of adsorbent and able to reuse multiple times Many industrial wastewaters are contaminated with both heavy metal ions and organic compounds, posing a major threat to public health and the environment. In this study, magnetic nanoparticle adsorbents, namely Mag-PCMA-T, which contain a maghemite core and a silica mesoporous layer that permanently confines surfactant micelles within the mesopores, were synthesized to achieve simultaneous removal of polycyclic aromatic hydrocarbons (PAHs) (1 mg/L) and metal contaminants (1 mg/L). The individual removal efficiency of Cd 2+ and acenaphthene using Mag-PCMA-T was evaluated under a range of initial ion concentrations and adsorbent dosages, as well as the competitive adsorption with Cd 2+ and acenaphthene simultaneously present. The isotherms and kinetics of Cd 2+ and acenaphthene sorption onto Mag-PCMA-T were determined. Mag-PCMA-T removed N85% of the acenaphthene in b30 min, with relatively high sorption capacity (up to 1060 mg/kg). Mag-PCMA-T also exhibited high sorption capacity for Cd 2+ (up to 2250 mg/kg). The simultaneous sorption performance was stable across a wide pH range (4-9) as well as in the presence of competitive metal ions (Ca 2+ and Mg 2+ ) or natural organic matters. The Mag-PCMA-T can be regenerated and reused, providing a sustainable, fast, convenient, and efficient approach for water treatment. b s t r a c t a r t i c l e i n f o© 2016 Published by Elsevier B.V. Contents lists available at ScienceDirectScience of the Total Environment

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Simultaneous removal of cadmium and nitrate in aqueous media by nanoscale zerovalent iron (nZVI) and Au doped nZVI particles

Cited by 181 publications

References 58 publications

Influence of Extracellular Polymeric Substances on the Long-Term Fate, Dissolution, and Speciation of Copper-Based Nanoparticles

Influence of Extracellular Polymeric Substances on the Long-Term Fate, Dissolution, and Speciation of Copper-Based Nanoparticles

Remediation of Cadmium Toxicity by Sulfidized Nano-Iron: The Importance of Organic Material

Simultaneous removal of PAHs and metal contaminants from water using magnetic nanoparticle adsorbents

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