Fig. 7

Effect of solution pH on adsorption capacity of Cu(II) ions onto \(\:\text{P}\text{m}\text{A}\text{P}/\text{A}\text{P}\text{T}\text{E}\text{S}{/\text{G}\text{O}}_{\left(6.6\right)}\): Cu(II) ions initial concentration 300 mg/L, adsorbent dosage 0.01 g, temperature 25 °C, stirring speed 120 rpm, contact time 3 h.