Effect of humic acid on the sulfamethazine adsorption by functionalized multi-walled carbon nanotubes in aqueous solution: mechanistic study

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 15184-15191 ◽  
Author(s):  
Quanquan Yang ◽  
Xiaogang Li ◽  
Guangcai Chen ◽  
Jianfeng Zhang ◽  
Baoshan Xing
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Humic Acid ◽  
Competitive Interactions ◽  
Mechanistic Study ◽  
Solution Ph ◽  
Pore Blockage ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Molecular Sieving

The presence of humic acid (HA) inhibited sulfamethazine (SMZ) adsorption by three types of multi-walled carbon nanotubesviacompetitive interactions, molecular sieving, and pore blockage in solution (pH < 9).

Removal of diazo dye Direct Red 23 from aqueous solution using zero-valent iron nanoparticles immobilized on multi-walled carbon nanotubes

2015 ◽  
Vol 71 (9) ◽  
pp. 1367-1374 ◽  
Author(s):  
Mahmoud Reza Sohrabi ◽  
Nafiseh Mansouriieh ◽  
Morteza Khosravi ◽  
Mohsen Zolghadr
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Zero Valent Iron ◽  
Mass Ratio ◽  
Solution Ph ◽  
Operational Conditions ◽  
Multi Walled Carbon Nanotubes ◽  
Diazo Dye ◽  
Zero Valent Iron Nanoparticles ◽  
Walled Carbon Nanotubes

The present study immobilized nanoscale zero-valent iron (nZVI) on multi-walled carbon nanotubes (MWCNTs) to enhance the reactivity of nZVI and prevent its aggregation. This novel composite (nZVI/MWCNT) was characterized by scanning electron microscopy and X-ray diffraction. The results showed that nZVI particles dispersed on the surface of the MWCNTs. The composite was used to remove the diazo dye Direct Red 23 from aqueous solution. The effects of nZVI to MWCNT mass ratio, nanocomposite content, solution pH, initial dye concentration and temperature were studied. The optimum nZVI/MWCNT mass ratio was 1:3. Batch experiments suggest that degradation efficiency decreased as the initial dye concentration increased and increased as the nanocomposite content increased, decreasing the pH from 8 to 4. The reaction followed a pseudo-first-order model under the operational conditions investigated in this study.

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
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