Nylon Sheet Adsorption of Congo Red Dye

Nylon sheet of 20% by mass based on fiber waste weight was employed as adsorbent material of anionic dye, Congo red (CR). Congo red dye solution have been prepared with concentration ranging from 100 to 700 mg/L. Then 10 ml of the different dye solutions is added to a predetermined weight of NS in a 50 ml glass flask. Then 50 rpm automatic shaker was used for variant times. The final concentration after adsorption was assessed using UV-Lambda 35 Perkin Elmer at λ_max = 495 nm.
The adsorption capacity q (mg g⁻¹) for Congo red dye can be evaluated using the following Eq. (3)³⁵ . $$q_e=\left(C_0,-,C_e\right)\times V/m$$ where C₀ and C_e in (mg/L), are the initial and equilibrium dye concentration, respectively, V in (L) is the volume of CR dye and m in (g) is the weight of NS adsorbent.
The removal efficiency for certain dye concentration at equilibrium can be explored by the next Eq. (4)^{36 (link)}. $$\%R=\frac{\left(C_0,-,C_e\right)}{C_0}\times 100$$
Effects of pH and regeneration studies on adsorption capacity of NS for Congo red were studied.