Comparative study of As (III) and Zn (II) removal from aqueous solutions using Philippine natural zeolite and alumina

Surface functionalized Philippine natural zeolite for arsenic adsorption in an aqueous solution

“…The pH of the solution was adjusted to 2.5 with NaOH solution or 2% H 2 SO4 solution. [15][16][17] When the solution was adjusted, the mixture was agitated using a bottle roller equipment at 100 rpm for 3 and 6 h. The residual arsenic concentration was determined, and the removal efficiency was calculated using Eq. ( 1):…”

“…The pH of the solution was adjusted to 2.5 with NaOH solution or 2% H 2 SO4 solution. [15][16][17] Once the solution was pH adjusted, the mixture was agitated using a bottle roller equipment at 100 rpm for 0.5 h, 1 h, 3 h, 6 h, 12 h, 16 h and 24 h. The solution was filtered using filter paper and the eluate was analyzed using the AAS.…”

“…Similar phase composition was discussed in the previous studies. 16,17,[24][25][26][27][28][29][30][31] 3.2. Morphology Figure 2(a) shows plate like structures of the irregular surface morphology and rough surface of Na-PNZ.…”

“…It is comparable to alumina, for the treatment of acid drainages (AMD) of polymetallic mines, particularly for Cu 2+ , Ni 2+ and Pb 2+ and As and Zn. [15][16][17] These low-cost mineral resources are abundant and is utilized due to its properties like high cation-exchange and molecular sieve effects. 18) It naturally has a porous structure while being "compact in size and allow simple and cheap maintenance in the full-scale applications".…”

“…It has a negatively charged honeycomb framework into which molecules may be adsorbed, and to catalyze chemical reactions as well. 16) The unique properties of natural zeolite include catalyzing action, adsorption capacity, thermal stability and resistance in multiple types of environment.…”