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. 2020 Aug 27;5(35):22255–22267. doi: 10.1021/acsomega.0c02526

Figure 5.

Figure 5

Effect of the presence of Ca2+ cations in synthetic and wastewater on Hg2+ adsorption by thiol membranes (Cys/CysM-PAA-PVDF). (a) Adsorption and desorption profiles of Ca2+ in thiol membranes from synthetic water with an initial Ca2+ concentration of around 30 ppm. (b) Adsorption profile of Ca2+ from the wastewater with the addition of Hg2+, and Ca2+ ions are to make a total feed concentration of approximately 50 ppb Hg2+ and 70 ppm Ca2+. (c) Adsorption of Hg2+ by thiol membranes from synthetic water with an initial Hg2+ concentration of ∼150 ppb. (d) Adsorption profile of Hg2+ from spiked wastewater in the presence of Ca2+ cations for both thiol membranes. Initial concentration of Hg2+ of ∼50 ppb. The spiked wastewater pH was around 6.5–7. The mass gain of all the membranes used for this study was in the range of 5–8%.