Figure 5: Adsorption tests in static salt water. | Nature Communications

Figure 5: Adsorption tests in static salt water.

From: Carbon nanotube membranes with ultrahigh specific adsorption capacity for water desalination and purification

Figure 5

(a) The plots of conductivity changes in static salt water when membranes are immersed in 1 ml of 0.02 M salt water. Membranes include: pure MCE, (i) pristine UCNT–MCE, (ii) acid-modified UCNT–MCE, (iii) 5-min plasma-modified and (iv) 10-min plasma-modified UCNT–MCE. Inset in a shows a photo of the membrane immersed in the salt solution. (b) Conductivity changes in static salt water using short MWCNT-based membranes: (v) pristine MWCNT–MCE and (vi) 10-min plasma-modified MWCNT–MCE. Inset in b plots the amount of salt adsorbed for all membranes in a and b. (c) Salt adsorbed for 10 min by plasma-modified UCNT–MCE with different UCNT mass in 0.02 M salt water and (d) for 160 μg of UCNT–MCE in salt water with different conductivities. Inset in d shows the Langmuir isotherm equation fitting plot of the experiment results, where the θ is the mass of salt adsorbed normalized by the total salt adsorption capacity, c is the normalized conductivity of the salt water at equilibrium and c0 is the Langmuir adsorption constant. Data represent mean±s.d. of three independent experiments.

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