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| 標題: | Optimization of manganese recovery from groundwater treatment sludge for the production of highly-efficient Cu(II) and Pb(II) adsorbents |
| 作者: | Ong, Dennis C.
Tumampos, Stephanie B.
Kan, Chi-Chuan
Pingul-Ong, Sheila Mae B.
Ensano, Benny Marie B.
Luna, Mark Daniel G. de |
| 貢獻者: | Univ Philippines Visayas, Sch Technol
Univ Philippines Diliman, Natl Grad Sch Engn, Environm Engn Program
Chia Nan Univ Pharm & Sci, Inst Hot Spring Ind
Dong A Univ, Univ Core Res Ctr Disaster Free & Safe Ocean City
Univ Philippines Diliman, Dept Chem Engn |
| 關鍵字: | Box-Behnken Design
Groundwater treatment sludge
Heavy metal adsorption
Isotherm
Kinetics
Manganese dioxide |
| 日期: | 2021 |
| 上傳時間: | 2023-11-11 11:57:01 (UTC+8) |
| 出版者: | ELSEVIER SCI LTD |
| 摘要: | Manganese is one of the main components of groundwater treatment sludge. Meanwhile, copper (Cu) and lead (Pb) ions are usually present in various metal plating spent rinse waters and their removal prior to effluent release is of great importance to mitigate the adverse effects of these metals on human health and the environment. In this study, manganese recovery from groundwater treatment sludge by reductive acid leaching was optimized to produce manganese dioxide adsorbents for the competitive removal of Cu(II) and Pb(II) from simulated electroplating wastewaters. Box-Behnken design was used to optimize manganese recovery and analyze the two-parameter interactions of reductive leaching parameters for manganese recovery from the sludge, namely: sulfuric acid concentration, hydrogen peroxide dosage and sludge mass. Results showed that manganese recovery via reductive acid leaching was found to be more dependent on sludge mass than on sulfuric acid concentration and hydrogen peroxide dosage. Analysis of the elemental adsorbent composition revealed a 72.47: 27.53 manganese-to-oxygen ratio, while the evaluation of the adsorbent surface functional groups confirmed the presence of hydroxides and manganese oxides. Adsorbent point-of-zero-charge was determined at pH 6.0. Adsorption capacities for Pb(II) and Cu(II) reached 177 and 118 mg g(-1), respectively. Metal uptake for both adsorbates conformed with the extended Langmuir isotherm, implying monolayer adsorption, while film diffusion was the rate-limiting mechanism. Overall, the findings of this study demonstrate high manganese recovery from groundwater treatment sludge and the production of highly-efficient adsorbents for the treatment of heavy metal-containing industrial effluents. |
| 關聯: | J ENVIRON CHEM ENG, v.9, n.1, pp.104705 |
| 顯示於類別: | [觀光事業管理系(含溫泉所)] 期刊論文
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