Interaction of polyhydroxy fullerenes with ferrihydrite: adsorption and aggregation

Liu, Jing; Xu, Tianyuan; Laipan, Minwang; Zhu, Yanping; Zhou, Qing; Zhu, Jianxi; He, Hongping

doi:10.1016/j.jes.2017.06.016

Cited by 21 publications

(10 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pH zpc of Fh was ∼8, and the zeta potentials of the CNM were all below −30 mV at pH = 7, in agreement with previous studies. , At the pH of our experiments (pH = 7), Fh was positively charged while the CNM was negatively charged, suggesting strong electrostatic interactions between Fh and CNM. In addition to electrostatic interaction, Liu et al suggested that chemical bonds could form between Fh and PHF through the dehydroxylation of PHF and deprotonation of Fh. GO with abundant hydroxyl groups (e.g., −OH) may interact with Fh through similar mechanisms.…”

Section: Results and Discussionsupporting

confidence: 92%

“…In fact, nanoparticles are ubiquitous in nature. − Among these nanoparticles, carbon nanomaterials (CNM) are important components, which can be both naturally and artificially produced from the widely distributed carbon-based compounds and materials. − The production of engineered CNM (e.g., carbon nanotube, fullerene, and graphene) is continuously increasing because of their wide industrial applications; , some natural processes (e.g., wildfire) can also produce large amounts of nanosized- or microsized carbon materials (e.g., biochar, charcoal, and soot). − In the near-surface environment, CNM will eventually be oxidized by photo-oxidation and natural oxidants . These oxidized CNM [e.g., graphene oxide (GO) and fullerol (PHF)] generally have better hydrophilicity and higher mobility in natural environments; , thus, they have high chances to coexist and interact with the widespread Fh, affecting its phase transformation process. Indeed, several previous studies found that these oxidized CNM with different morphologies showed different interaction behaviors with Fe (oxyhydr)oxide. − For instance, Liu et al demonstrated that PHF can evidently enhance the aggregation of Fh nanoparticles by acting as a “bridge”; Zhao et al suggested that GO can function as a dispersing agent and significantly enhance the dispersion of the coexisting Gth by heteroaggregation.…”

Section: Introductionmentioning

confidence: 99%

“…These oxidized CNM [e.g., graphene oxide (GO) and fullerol (PHF)] generally have better hydrophilicity and higher mobility in natural environments; , thus, they have high chances to coexist and interact with the widespread Fh, affecting its phase transformation process. Indeed, several previous studies found that these oxidized CNM with different morphologies showed different interaction behaviors with Fe (oxyhydr)oxide. − For instance, Liu et al demonstrated that PHF can evidently enhance the aggregation of Fh nanoparticles by acting as a “bridge”; Zhao et al suggested that GO can function as a dispersing agent and significantly enhance the dispersion of the coexisting Gth by heteroaggregation. As such, we expect that CNM with varied sizes and morphologies might exert diverse effects on the phase transformation of Fh.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Fullerol and Graphene Oxide on the Phase Transformation of Two-Line Ferrihydrite

Yan

Zhu

Liu

et al. 2020

ACS Earth Space Chem.

Self Cite

View full text Add to dashboard Cite

Two-line ferrihydrite (Fh) is an omnipresent iron oxyhydroxide nanomineral with high surface reactivity and weak crystallinity, and its phase transformation in nature has drawn significant concerns. A number of studies have investigated the effects of coexisting natural substances (e.g., ions, organic molecules, and clay minerals) on the phase transformation processes of Fh. This work, for the first time, studied the effects of coexisting carbon nanomaterials (CNM) on the phase transformation of Fh, and CNM with different morphologies, that is, graphene oxide (GO) and fullerol (PHF), were applied. Characterization results from X-ray diffraction, transmission electron microscopy, and Mossbauer spectroscopy showed that the transformed products of Fh are mainly hematite (Hem) with a small amount of goethite (Gth) in the absence/presence of CNM; however, the transformation kinetics, morphologies, and Hem/Gth ratio of the transformed products are distinctly different in each system. In particular, GO decreased the transformation rate of Fh (compared with the Fh system), whereas PHF not only accelerated the transformation rate but also favored the formation of larger Hem particles and higher Hem/Gth ratios in the transformed products. We hypothesized that these results could be attributed to the different behaviors of CNM in affecting the aggregation of Fh as the transformation of Fh into Hem is a solid phase transformation process (via dehydration), which strongly relies on the aggregation of Fh particles. In this term, the samples of CNM−Fh mixtures before transformation were characterized. The results obtained from atomic force microscopy and sedimentation experiments showed that the large lamellar GO could act as a dispersing agent and inhibit the aggregation and contact of Fh particles while the nanogranular PHF functioned as a "bridge" and enhanced the aggregation of Fh particles. This study revealed that the coexisting nanoparticles (e.g., PHF and GO) could exert different influences on the transformation of Fh by influencing its aggregation and dispersion.

show abstract

Section: Results and Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Fullerol and Graphene Oxide on the Phase Transformation of Two-Line Ferrihydrite

Yan

Zhu

Liu

et al. 2020

ACS Earth Space Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The band at 1,632 cm À1 was shifted to 1,631 cm À1 , which was attributed to the presence of -OH groups even after fluoride adsorption onto FeONs (Jayarathna et al 2015;Mohseni-Bandpi et al 2015). The intensity of the band at 1,383 cm À1 was increased sharply, perhaps representing the characteristic peak of fluoride adsorption (Patnaik et al 2016;Liu et al 2018). The results generally indicate that the surface hydroxyl groups play a significant role in fluoride adsorption.…”

Section: Ft-ir Analysismentioning

confidence: 79%

Defluoridation of calcium-rich groundwater using iron oxide nanoparticles

Sudasinghe

Jayaweera

Gunawardana

et al. 2019

Water Practice and Technology

View full text Add to dashboard Cite

It has been suggested that moderate to high fluoride ion concentrations in the presence of calcium in groundwater can represent human health hazards resulting in possible lesions in tubular cells, leading to chronic kidney disease of unknown etiology (CKDu). This study focuses on fluoride removal in the presence of calcium using iron oxide nanoparticles (FeONs) as an effective adsorbent in single- and multi-solute batch-studies. Fluoride and calcium removal by FeONs in single-solute batch-studies occurred only by adsorption. Both species followed the Langmuir isotherm model and pseudo second-order kinetics, indicating monolayer adsorption and chemisorption, respectively. In multi-solute batch-studies, fluoride removal was attributed to adsorption and chemical precipitation forming CaF2 in almost similar magnitude. For calcium removal in multi-solute studies, adsorption, co-precipitation, and precipitation were the prominent mechanisms, with co-precipitation dominant. Thus, FeONs are effective in fluoride removal by adsorption in both the presence and absence of calcium. FeONs could also be used successfully year-round in tropical climates, where calcium levels vary substantially, to lessen the risk of CKDu.

show abstract

“…The correlation coefficients of the two models are 0.9832 and 0.9981, respectively, which are very close, indicating that the adsorption of Cr(VI) by ceramsite is very complex. There is monolayer adsorption with adsorbates attached to the surface of the adsorbent and non-uniform multilayer adsorption with adsorbates accumulated on the surface of the adsorbent [30]. However, the n of the Freundlich model is greater than 2, which indicates that this adsorption model is not easy to conduct [31].…”

Section: Adsorption Isothermmentioning

confidence: 99%

Study on the Preparation of Biochar Ceramsite Based on Sewage Sludge and the Characterization of Its Properties

2021

View full text Add to dashboard Cite

Biochar ceramsite was prepared from residual sludge at different temperatures. Specific surface area, compressive strength, and toxic leaching tests were used to compare the properties. Through tests and scanning electron microscopy (SEM), it was found that with the increase of preparation temperature, the ceramsite showed higher porosity, larger specific surface area, and better compressive strength. The leaching amount of toxic heavy metals is low when the temperature is higher than 650 °C. According to X-ray diffraction (XRD) analysis, the main component of sludge is quartz. There were amounts of iron and aluminum in sludge, which were the main reason for its good adsorption efficiency. Through the adsorption experiment on Cr(VI), it was found that the adsorption efficiency of the ceramsite on Cr(VI) was better at low pH, and the adsorption isotherm fitted well with Langmuir and Freundlich types. The adsorption process had both monolayer adsorption and multilayer adsorption, and the adsorption process was in line with the pseudo-second-order kinetics.

show abstract

Interaction of polyhydroxy fullerenes with ferrihydrite: adsorption and aggregation

Cited by 21 publications

References 44 publications

Effects of Fullerol and Graphene Oxide on the Phase Transformation of Two-Line Ferrihydrite

Effects of Fullerol and Graphene Oxide on the Phase Transformation of Two-Line Ferrihydrite

Defluoridation of calcium-rich groundwater using iron oxide nanoparticles

Study on the Preparation of Biochar Ceramsite Based on Sewage Sludge and the Characterization of Its Properties

Contact Info

Product

Resources

About