In Situ Measurement of Aggregation Effect of Nanoscale Zero-valent Iron in the Presence of Natural Organic Matter Based on the Dynamic Light Scattering Technique

Zhi-xiong LI; Yi-tong HAN; Yong-qiang XU; Yang YANG; Jia-wei CHEN

doi:10.15898/j.cnki.11-2131/td.2016.06.010

2016 Vol. 35, No. 6

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Article navigation > Rock and Mineral Analysis > 2016 > 35(6): 634-641

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Zhi-xiong LI, Yi-tong HAN, Yong-qiang XU, Yang YANG, Jia-wei CHEN. In Situ Measurement of Aggregation Effect of Nanoscale Zero-valent Iron in the Presence of Natural Organic Matter Based on the Dynamic Light Scattering Technique[J]. Rock and Mineral Analysis, 2016, 35(6): 634-641. doi: 10.15898/j.cnki.11-2131/td.2016.06.010

Citation:

Zhi-xiong LI, Yi-tong HAN, Yong-qiang XU, Yang YANG, Jia-wei CHEN. In Situ Measurement of Aggregation Effect of Nanoscale Zero-valent Iron in the Presence of Natural Organic Matter Based on the Dynamic Light Scattering Technique[J]. Rock and Mineral Analysis, 2016, 35(6): 634-641. doi: 10.15898/j.cnki.11-2131/td.2016.06.010

In Situ Measurement of Aggregation Effect of Nanoscale Zero-valent Iron in the Presence of Natural Organic Matter Based on the Dynamic Light Scattering Technique

1.
State Key Laboratory of Biogeology and Environmental Geology, Beijing 100083, China
2.
School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China

More Information

Corresponding author: Jia-wei CHEN, chenjiawei@cugb.edu.cn

Received Date: 06 August 2016

Revised Date: 01 November 2016

Accepted Date: 11 November 2016

Abstract

Abstract

Nanoscale zero-valent iron (nZVI) is a newly developed method for in-situ remediation of groundwater in recent years. To overcome easy oxidation and aggregation, modification on nZVI is widely adopted. In addition, the ubiquitous natural organic matters (NOM) in water also affect the scatter and reaction activity of nZVI. Therefore, it is of significance to study the aggregation effect of different kinds of nZVI in water by in-situ measurement method. Besides commercial nZVI (RNIP), normal nZVI, carboxymethyl cellulose coated nZVI (C-nZVI) and bentonite supported nZVI (B-nZVI) was synthesized. Nano particle size/Zeta potential analyzer based on the Dynamic Light Scattering (DLS) technique, Transmission Electron Microscope (TEM) and UV-Vis spectrum of sedimentation were employed to characterize the aggregation behavior of above four types of nZVI in the presence or absence of humic acid (HA), a representative NOM. The results showed that the dispersion stability of C-nZVI and B-nZVI was improved significantly after modification and the aggregation precipation was suppressed. And size distribution of aggregates stabilizes at below 1000 nm. Humic acid adsorbed onto the surface of nanoparticles, which can increase the electrostatic force to prevent aggregation of nZVI. The effect of HA on B-nZVI is most obvious for B-nZVI aggregates with diameters below 100 nm and the sedimentation was very slow, indicating the dispersion performed the best among all kinds of nZVI. It can be concluded that the combination of DLS technique and TEM to characterize nanoparticles is a valuable approach for more comprehensive information.
- dynamic light scattering /
- nanoscale zero-valent iron /
- in situ measurement /
- nature organic matter /
- aggregation effect

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References

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