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    標題: Isotherm, Kinetics and Thermodynamics of Cu(II) and Pb(II) Adsorption on Groundwater Treatment Sludge-Derived Manganese Dioxide for Wastewater Treatment Applications
    作者: Tumampos, Stephanie B.
    Ensano, Benny Marie B.
    Pingul-Ong, Sheila Mae B.
    Ong, Dennis C.
    Kan, Chi-Chuan
    Yee, Jurng-Jae
    de Luna, Mark Daniel G.
    貢獻者: Univ Philippines Diliman, Natl Grad Sch Engn, Environm Engn Program
    Dong A Univ, Univ Core Res Ctr Disaster Free & Safe Ocean City
    Univ Philippines Visayas, Sch Technol
    Chia Nan Univ Pharm & Sci, Inst Hot Spring Ind
    Dong A Univ, Dept Architectural Engn
    Univ Philippines Diliman, Dept Chem Engn
    關鍵字: groundwater treatment sludge
    heavy metal adsorption
    manganese dioxide
    日期: 2021
    上傳時間: 2023-11-11 11:54:03 (UTC+8)
    出版者: MDPI
    摘要: 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 degrees 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.
    關聯: INT J ENV RES PUB HE, v.18, n.6, pp.3050
    显示于类别:[台灣溫泉研究發展中心] 期刊論文


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