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

Stephanie B. Tumampos, Benny Marie B. Ensano, Sheila Mae B. Pingul-Ong, Dennis C. Ong, Chi-Chuan Kan, Jurng-Jae Yee and Mark Daniel G. de Luna
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Stephanie B. Tumampos: Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines
Benny Marie B. Ensano: University Core Research Center for Disaster-free and Safe Ocean City Construction, Dong-A University, Busan 49315, Korea
Sheila Mae B. Pingul-Ong: Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines
Dennis C. Ong: Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines
Chi-Chuan Kan: Institute of Hot Spring Industry, Chia-Nan University of Pharmacy and Science, Tainan 71710, Taiwan
Jurng-Jae Yee: Department of Architectural Engineering, Dong-A University, Busan 49315, Korea
Mark Daniel G. de Luna: Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines

IJERPH, 2021, vol. 18, issue 6, 1-13

Abstract: 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 MnO 2 . The as-synthesized MnO 2 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 MnO 2 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 MnO 2 was spontaneous, endothermic, and had increased randomness. Overall, the use of MnO 2 prepared from groundwater treatment sludge is an effective, economical, and environmentally sustainable substitute to expensive reagents for toxic metal ion removal from water matrices.

Keywords: groundwater treatment sludge; heavy metal adsorption; isotherm; kinetics; manganese dioxide; thermodynamics (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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