Study on Kinetics, Thermodynamics and Mechanism for Carbon Nanotubes Adsorbing Humic Acid

2011 ◽  
Vol 26 (2) ◽  
pp. 170-174 ◽  
Author(s):  
Zhi-PING ZHU ◽  
Ke-Long HUANG ◽  
Yi ZHOU
Keyword(s):  
Carbon Nanotubes ◽  
Humic Acid

Retracted Article: Enhanced adsorption of ionizable aromatic compounds on humic acid-coated carbonaceous adsorbents

RSC Advances ◽  
2012 ◽  
Vol 2 (27) ◽  
pp. 10359-10364 ◽  
Author(s):  
Yubing Sun ◽  
Changlun Chen ◽  
Dadong Shao ◽  
Jiaxing Li ◽  
Xiaoli Tan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Activated Carbon ◽  
Humic Acid ◽  
Aromatic Compounds ◽  
Flake Graphite ◽  
Graphene Oxide Nanosheets ◽  
Multiwalled Carbon ◽  
Retracted Article ◽  
Enhanced Adsorption

Adsorption of ionizable aromatic compounds (IACs) such as 1-naphthylamine and 1-naphthol on Humic acid (HA)-coated graphene oxide nanosheets (GONs), multiwalled carbon nanotubes (MWCNTs), activated carbon (AC), and flake graphite (FG) were investigated by the batch techniques.

Enhanced Environmental Mobility of Carbon Nanotubes in the Presence of Humic Acid and Their Removal from Aqueous Solution

Small ◽  
2008 ◽  
Vol 4 (12) ◽  
pp. 2166-2170 ◽  
Author(s):  
Peng Wang ◽  
Qihui Shi ◽  
Hongjun Liang ◽  
David W. Steuerman ◽  
Galen D. Stucky ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Humic Acid

Sorption of humic acid to functionalized multi-walled carbon nanotubes

2013 ◽  
Vol 180 ◽  
pp. 1-6 ◽  
Author(s):  
Fei Wang ◽  
Jun Yao ◽  
Huilun Chen ◽  
Zhengji Yi ◽  
Baoshan Xing
Keyword(s):  
Carbon Nanotubes ◽  
Humic Acid ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Humic acid assisted stabilization of dispersed single-walled carbon nanotubes in cementitious composites

2019 ◽  
Vol 8 (1) ◽  
pp. 513-522 ◽  
Author(s):  
Tao Hu ◽  
Hongwen Jing ◽  
Luan Li ◽  
Qian Yin ◽  
Xinshuai Shi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Humic Acid ◽  
Mechanical Performance ◽  
Single Walled Carbon Nanotubes ◽  
Cementitious Composites ◽  
Cement Slurry ◽  
Sem Images ◽  
Single Walled Carbon ◽  
Alkaline Environment ◽  
Walled Carbon Nanotubes

AbstractSignificant research has been done in recent decades in the field of the dispersion of carbon nanotubes in aqueous solutions and the reinforcement of ordinary Portland cement (OPC). However, the cementitious mixture, as an alkaline environment, easily leads to the re-agglomeration of dispersed single-walled carbon nanotubes (SWCNTs) and influences their enhancing effects. Humic acid (HA) is a type of natural organic matter which can assist the stabilization of dispersed single-walled carbon nanotubes in cementitious composites. The present study characterizes the influence of HA in stabilizing the dispersion of SWCNTs by means of ultraviolet spectrophotometer tests. The fluidity of fresh cement slurry and mechanical performance of hardened OPC pastes were measured to better illustrate the dispersion of SWCNTs in real cement composites. The results not only reveal that the addition of an alkaline environment to the SWCNT suspensions results in a rapid decrease of the dispersion, but also suggest that the appropriate content of HA (0.12 wt.%) can play a significant role in stabilizing the dispersion of SWCNTs. When the mixed hybrid of SWCNTs and HA with a concentration of HA/c equal to 0.05 wt.% is used, the fluidity of the fresh cement slurry experiences a maximum decline and this mixture content of materials will dramatically increase the compressive and flexural strength by about 31% and 48%, which indicates that more SWCNTs are in a dispersed state under this concentration. SEM images further prove that a suitable HA/c can inhibit the expansion of cracks in the cementitious composites.

scholarly journals Acute Toxicity of Double-Walled Carbon Nanotubes to Three Aquatic Organisms

2015 ◽  
Vol 2015 ◽  
pp. 1-19 ◽  
Author(s):  
Lungile P. Lukhele ◽  
Bhekie B. Mamba ◽  
Ndeke Musee ◽  
Victor Wepener
Keyword(s):  
Carbon Nanotubes ◽  
Humic Acid ◽  
Ionic Strength ◽  
Acute Toxicity ◽  
Poecilia Reticulata ◽  
Aquatic Organisms ◽  
Trophic Levels ◽  
Pseudokirchneriella Subcapitata ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This study investigated the toxicity of double walled carbon nanotubes (DWCNTs) to three aquatic organisms, namely,Pseudokirchneriella subcapitata,Daphnia pulex, andPoecilia reticulataunder the influence of exposure media properties specifically the ionic strength and organic matter represented by humic acid. Results indicated that ionic strength enhanced DWCNTs agglomeration whilst humic acid stabilized the CNTs and in turn inhibited the formation of aggregates. LC50s forD. pulexwere higher at 2.81 and 4.45 mg/L for pristine and oxidised DWCNTs, respectively; however,P. reticulatahad lower values of 113.64 mg/L and 214.0 mg/L for the same CNTs correspondingly.P. subcapitatahad EC50s of 17.95 mg/L and 10.93 mg/L for the pristine and oxidised DWCNTs, respectively. In the presence of humic acid high DWCNTs acute toxicity towardsD. pulexandP. reticulatawas observed but ionic strength led to opposite effect irrespective of DWCNTs form. Both humic acid and ionic strength shielded theP. subcapitatafrom toxic effects of DWCNTs. Overall, our findings suggest that the toxicity of DWCNTs in the aquatic systems (i) will be dependent on media properties and (ii) is likely to proceed at different rates to organisms at different trophic levels.

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