Stability and Aggregation Kinetics of Titania Nanomaterials under Environmentally Realistic Conditions

Raza, Ghulam; Amjad, Muhammad; Kaur, Inder Preet; Wen, Dongsheng

doi:10.1021/acs.est.5b05746

Cited by 35 publications

(22 citation statements)

References 57 publications

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“…Since the surface chemistry of the NPs and the solution composition and chemistry play an important role in the process of aggregation/agglomeration of NPs [ 47 , 48 ], we obtained the surface area, size, and zeta potential values of TiO 2 NPs in algal media. The surface area of the TiO 2 NPs before exposure was measured with N 2 -sorption with a Quantachrome model Nova 2000 and found to be 44.0 ± 2.9 m 2 /g.…”

Section: Resultsmentioning

confidence: 99%

Influence of Algae Age and Population on the Response to TiO2 Nanoparticles

Metzler

Erdem

Huang

2018

IJERPH

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This work shows the influence of algae age (at the time of the exposure) and the initial algae population on the response of green algae Raphidocelis subcapitata to titanium dioxide nanoparticles (TiO2 NPs). The different algae age was obtained by changes in flow rate of continually stirred tank reactors prior to NP exposure. Increased algae age led to a decreased growth, variations in chlorophyll content, and an increased lipid peroxidation. Increased initial algae population (0.3−4.2 × 106 cells/mL) at a constant NP concentration (100 mg/L) caused a decline in the growth of algae. With increased initial algae population, the lipid peroxidation and chlorophyll both initially decreased and then increased. Lipid peroxidation had 4× the amount of the control at high and low initial population but, at mid-ranged initial population, had approximately half the control value. Chlorophyll a results also showed a similar trend. These results indicate that the physiological state of the algae is important for the toxicological effect of TiO2 NPs. The condition of algae and exposure regime must be considered in detail when assessing the toxicological response of NPs to algae.

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Section: Resultsmentioning

confidence: 99%

Influence of Algae Age and Population on the Response to TiO2 Nanoparticles

Metzler

Erdem

Huang

2018

IJERPH

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“…The transformations of ENPs (and adsorbed metallic pollutants) strongly depend on: (i) Characteristics of ENPs (composition, size, shape, surface properties, crystal structure, etc. ); for example, TiO 2 NPs, SiO 2 NPs and Al 2 O 3 NPs of smaller size aggregate easier than larger ones [64]; Rutile TiO 2 NPs aggregate stronger than anatase of comparable size [65]; TiO 2 NPs with sodium citrate were more stable than polyvinylpyrrolidone, sodium dodecyl sulfate and polyethylene glycol [66]. (ii) Exposure medium variables (ionic strength, pH, composition and concentration of dissolved organic matter (DOM) etc.…”

Section: Transformations Of Mixture Of Enps and Metallic Pollutants Imentioning

confidence: 99%

Effects of Mixtures of Engineered Nanoparticles and Metallic Pollutants on Aquatic Organisms

Liu

Slaveykova

2020

Environments

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In aquatic environment, engineered nanoparticles (ENPs) are present as complex mixtures with other pollutants, such as trace metals, which could result in synergism, additivity or antagonism of their combined effects. Despite the fact that the toxicity and environmental risk of the ENPs have received extensive attention in the recent years, the interactions of ENPs with other pollutants and the consequent effects on aquatic organisms represent an important challenge in (nano)ecotoxicology. The present review provides an overview of the state-of-the-art and critically discusses the existing knowledge on combined effects of mixtures of ENPs and metallic pollutants on aquatic organisms. The specific emphasis is on the adsorption of metallic pollutants on metal-containing ENPs, transformation and bioavailability of ENPs and metallic pollutants in mixtures. Antagonistic, additive and synergistic effects observed in aquatic organisms co-exposed to ENPs and metallic pollutants are discussed in the case of “particle-proof” and “particle-ingestive” organisms. This knowledge is important in developing efficient strategies for sound environmental impact assessment of mixture exposure in complex environments.

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“…四种阳离子的电负性数值如下 [38] : All experiments were carried out at pH＝6±0.1, C 0(GO) ＝22 mg/L, and T＝298 K 在研究离子在水溶液中的行为时, 离子的水合作用是不可忽视的一部分. 由于水分子为极性分子, 故会在具有电荷的离子周围形成水合层 [39] . 例如, 水分子中呈负电性的氧原子向正电性阳离子周围聚拢形成水合层.…”

Section: 阳离子对 Go 聚沉行为的影响unclassified