Concurrent agglomeration and straining govern the transport of 14C-labeled few-layer graphene in saturated porous media
Saved in:
| Title: | Concurrent agglomeration and straining govern the transport of 14C-labeled few-layer graphene in saturated porous media |
|---|---|
| Authors: | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China ( host institution ), Su, Yu ( author ), Gao, Bin ( UF author ), Mao, Liang ( author ) |
| Source: | Water Research. 115:84-93 |
| Publisher Information: | Elsevier BV, 2017. |
| Publication Year: | 2017 |
| Subject Terms: | 2. Zero hunger, Osmolar Concentration, Porous media, Water, Quartz, Silicon Dioxide, 01 natural sciences, 6. Clean water, Release, Straining, Graphite, Graphene, Deposition, Porosity, 0105 earth and related environmental sciences |
| Description: | Deposition of graphene on environmental surfaces will dictate its transport and risks. In this work, the deposition, mobilization, and transport of 14C-labeled few-layer graphene (FLG) in saturated quartz sand were systematically examined. Increasing solution ionic strength (IS) (1-100 mmol/L NaCl) resulted in greater retention of FLG (33-89%) in the sand and more hyper-exponential distribution of FLG along the sand column. Only a small fraction (≤7.4%) of the retained FLG was remobilized due to perturbation of IS by deionized water. These results indicate that trapping in pore spaces (i.e., physical straining) plays a dominant role in FLG deposition rather than attachment onto the surfaces of the sand. When IS, FLG input concentration, and flow velocity favor particle-particle interaction over particle-collector interaction, concurrent agglomeration within the pores promotes straining. In addition, electrostatic and steric repulsion that derived from the adsorbed organic macromolecules on FLG effectively reduced agglomeration and thereby enhanced transport and release of FLG. Moreover, the recovery of FLG (that deposited at 100 mmol/L NaCl) in the effluent reached 33% after speeding up the deionized water flushing rate. These findings highlight the need for FLG management in view of variations in transport behavior when assessing water quality and associated risks. |
| Document Type: | Article |
| Language: | English |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/j.watres.2017.02.052 |
| Access URL: | https://pubmed.ncbi.nlm.nih.gov/28259817 https://www.sciencedirect.com/science/article/pii/S0043135417301446 https://www.ncbi.nlm.nih.gov/pubmed/28259817 https://europepmc.org/abstract/MED/28259817 |
| Rights: | Elsevier TDM CC BY NC ND |
| Accession Number: | edsair.doi.dedup.....b97b0e48402f15acbf3fb74ec491084f |
| Database: | OpenAIRE |
Full Text Finder 
Nájsť tento článok vo Web of Science | Abstract: | Deposition of graphene on environmental surfaces will dictate its transport and risks. In this work, the deposition, mobilization, and transport of 14C-labeled few-layer graphene (FLG) in saturated quartz sand were systematically examined. Increasing solution ionic strength (IS) (1-100 mmol/L NaCl) resulted in greater retention of FLG (33-89%) in the sand and more hyper-exponential distribution of FLG along the sand column. Only a small fraction (≤7.4%) of the retained FLG was remobilized due to perturbation of IS by deionized water. These results indicate that trapping in pore spaces (i.e., physical straining) plays a dominant role in FLG deposition rather than attachment onto the surfaces of the sand. When IS, FLG input concentration, and flow velocity favor particle-particle interaction over particle-collector interaction, concurrent agglomeration within the pores promotes straining. In addition, electrostatic and steric repulsion that derived from the adsorbed organic macromolecules on FLG effectively reduced agglomeration and thereby enhanced transport and release of FLG. Moreover, the recovery of FLG (that deposited at 100 mmol/L NaCl) in the effluent reached 33% after speeding up the deionized water flushing rate. These findings highlight the need for FLG management in view of variations in transport behavior when assessing water quality and associated risks. |
|---|---|
| ISSN: | 00431354 |
| DOI: | 10.1016/j.watres.2017.02.052 |