“…Minor quartz (Levien et al , 1980) is also present. These results are consistent with the reported composition of the PNZ based on previous works (Cagomoc & Vasquez, 2017; Gili et al , 2019a, 2019b). Fig.…”
Section: Resultssupporting
confidence: 94%
“…2. Several studies report similar behaviour of natural zeolites that follows the pseudo-second-order kinetic model as the best sorption mechanism (Wang et al , 2007; Taffarel & Rubio, 2009; Gili et al , 2019a). Fig.…”
Section: Resultsmentioning
confidence: 86%
“…The same model also resulted in a better fit for the adsorption of Ni 2+ by natural Na-mordenite at 30°C and 40°C (Wang et al , 2007). The Langmuir model also better fit the thermodynamic isotherm for the adsorption of Zn 2+ ions by raw PNZ (Gili et al , 2019a). Fig.…”
Section: Resultsmentioning
confidence: 99%
“…Natural zeolites have been extensively studied for their heavy metal and radionuclide sorption (Faghihian et al , 1999; Gili et al , 2019a; Olegario et al , 2019). They may be efficient adsorbents for heavy metals depending on the abundance of zeolite components and amount of impurities.…”
mentioning
confidence: 99%
“…(Received 24 April 2020; revised 13 October 2020; Accepted Manuscript online: 20 October 2020; Principal Editor: George E. Christidis) Natural zeolites have been extensively studied for their heavy metal and radionuclide sorption (Faghihian et al, 1999;Gili et al, 2019a;Olegario et al, 2019). They may be efficient adsorbents for heavy metals depending on the abundance of zeolite components and amount of impurities.…”
“…Minor quartz (Levien et al , 1980) is also present. These results are consistent with the reported composition of the PNZ based on previous works (Cagomoc & Vasquez, 2017; Gili et al , 2019a, 2019b). Fig.…”
Section: Resultssupporting
confidence: 94%
“…2. Several studies report similar behaviour of natural zeolites that follows the pseudo-second-order kinetic model as the best sorption mechanism (Wang et al , 2007; Taffarel & Rubio, 2009; Gili et al , 2019a). Fig.…”
Section: Resultsmentioning
confidence: 86%
“…The same model also resulted in a better fit for the adsorption of Ni 2+ by natural Na-mordenite at 30°C and 40°C (Wang et al , 2007). The Langmuir model also better fit the thermodynamic isotherm for the adsorption of Zn 2+ ions by raw PNZ (Gili et al , 2019a). Fig.…”
Section: Resultsmentioning
confidence: 99%
“…Natural zeolites have been extensively studied for their heavy metal and radionuclide sorption (Faghihian et al , 1999; Gili et al , 2019a; Olegario et al , 2019). They may be efficient adsorbents for heavy metals depending on the abundance of zeolite components and amount of impurities.…”
mentioning
confidence: 99%
“…(Received 24 April 2020; revised 13 October 2020; Accepted Manuscript online: 20 October 2020; Principal Editor: George E. Christidis) Natural zeolites have been extensively studied for their heavy metal and radionuclide sorption (Faghihian et al, 1999;Gili et al, 2019a;Olegario et al, 2019). They may be efficient adsorbents for heavy metals depending on the abundance of zeolite components and amount of impurities.…”
Small-scale mining in the Philippines lacks research and technologies for the application of an inexpensive and environmentally sound treatment of its wastewaters. Hence, laboratory-scale xed-bed column tests were carried out to test and evaluate the sorbent adsorption performance of the Philippine Natural Bentonite (PNB) and the Philippine Natural Zeolite (PNZ) against the heavy metals present in the ball mill facilities within the Baguio Mining District. Results showed that removal percentages of PNB and PNZ in terms of lead (Pb) concentrations are 50.43% and 26.90%, respectively. Moreover, the dynamic uptake capacity and maximum adsorption capacity values of PNB showed greater values than PNZ and the sorption models, Bohart-Adams, Wolborska, Thomas, and Yoon-Nelson models, which displayed a good t for the breakthrough curves. Furthermore, the effect of varied ow rate and bed height manifested that an increase in ow rate yields a lesser saturation time while the rise in bed height increases uptake capacity, saturation time, and removal percentage of the system. Regarding the cost-e ciencies of the sorbents, the study revealed that PNB is more cost-e cient than PNZ since only 1.13 Philippine pesos of PNB is required to remove a gram of Pb compared to PNZ, which cost 3.30 pesos. Therefore, this research concluded that PNB could be a better sorbent of Pb in terms of removal percentage and cost-e ciency. The study recommends more regeneration studies for the reusability of the sorbents after exhaustion and hopes that this research will be a springboard for further environmental studies.
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