Optimization of manganese recovery from groundwater treatment sludge for the production of highly-efficient Cu(II) and Pb(II) adsorbents

Ong, Dennis C.; Tumampos, Stephanie; Kan, Chi-Chuan; Pingul-Ong, Sheila Mae B.; Ensano, Benny Marie B.; Luna, Mark Daniel G. de

doi:10.1016/j.jece.2020.104705

Cited by 5 publications

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“…The results shown in Figure 2 a,b are similar to a previous study [ 15 ], and the removal of Cu(II) and Pb(II) from the aqueous solutions can be attributed to the fixed amount of negative surface charge on the MnO 2 that interacted with the metal ions at all pH levels. Although the sludge-derived adsorbent had a pH PZC of 6.0 [ 16 ], the metal uptake results confirmed that MnO 2 remained effective in adsorbing Cu(II) and Pb(II) even at lower pH levels.…”

Section: Resultsmentioning

confidence: 99%

“…The sludge-derived MnO 2 was synthesized following the method reported in previous studies [ 14 , 15 , 16 ]. Predetermined volumes of 0.8 M H 2 SO 4 and 0.8 M H 2 O 2 were added to the dried sludge in a 250 mL Erlenmeyer flask, and the mixture was stirred on a magnetic stirrer and hot plate (PC-420D, Corning, NY, USA) for 5 min at 150 rpm and 25 °C.…”

Section: Methodsmentioning

confidence: 99%

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Isotherm, Kinetics and Thermodynamics of Cu(II) and Pb(II) Adsorption on Groundwater Treatment Sludge-Derived Manganese Dioxide for Wastewater Treatment Applications

Tumampos

Ensano

Pingul-Ong

et al. 2021

IJERPH

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The ubiquitous occurrence of heavy metals in the aquatic environment remains a serious environmental and health issue. The recovery of metals from wastes and their use for the abatement of toxic heavy metals from contaminated waters appear to be practical approaches. In this study, manganese was recovered from groundwater treatment sludge via reductive acid leaching and converted into spherical aggregates of high-purity MnO2. The as-synthesized MnO2 was used to adsorb Cu(II) and Pb(II) from single-component metal solutions. High metal uptake of 119.90 mg g−1 for Cu(II) and 177.89 mg g−1 for Pb(II) was attained at initial metal ion concentration, solution pH, and temperature of 200 mg L−1, 5.0, and 25 °C, respectively. The Langmuir isotherm model best described the equilibrium metal adsorption, indicating that a single layer of Cu(II) or Pb(II) was formed on the surface of the MnO2 adsorbent. The pseudo-second-order model adequately fit the Cu(II) and Pb(II) kinetic data confirming that chemisorption was the rate-limiting step. Thermodynamic studies revealed that Cu(II) or Pb(II) adsorption onto MnO2 was spontaneous, endothermic, and had increased randomness. Overall, the use of MnO2 prepared from groundwater treatment sludge is an effective, economical, and environmentally sustainable substitute to expensive reagents for toxic metal ion removal from water matrices.

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Section: Resultsmentioning

confidence: 99%