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| Adsorption of Pb2+ by different organic materials in aqueous solution |
| Received:March 01, 2017 |
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| KeyWord:biochar;straw;chicken manure;mushroom cultivation residue;adsorption;Pb |
| Author Name | Affiliation | | SHAO Yun | College of Life Sciences, Henan Normal University, Xinxiang 453000, China | | CHEN Jing-wen | College of Life Sciences, Henan Normal University, Xinxiang 453000, China | | WANG Wen-peng | College of Life Sciences, Henan Normal University, Xinxiang 453000, China | | CUI Jing-ming | College of Life Sciences, Henan Normal University, Xinxiang 453000, China | | LI Hao-yang | College of Life Sciences, Henan Normal University, Xinxiang 453000, China | | WANG Lu | College of Life Sciences, Henan Normal University, Xinxiang 453000, China | | MA Shou-chen | School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China |
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| Abstract: |
| Lead(Pb) is a common pollutant in water and soil, and organic materials have the potential to adsorb heavy metals.The properties and Pb2+ absorption capacity of four kinds of agricultural and forestry wastes or processed products there of(sawdust biochar, corn stalks, chicken manure, and mushroom cultivation residue) were studied. The morphology and functional groups of these materials were characterized using SEM and FTIR methods. Batch adsorption experiments were conducted to investigate the effects of pH, time, and initial Pb2+ concentration on the Pb2+ adsorption capacity, and the adsorption kinetics and efficiency were studied by using different kinetic models, as well as Langmuir and Freundlich models, to fit the experimental data. All four organic materials effectively adsorbed Pb2+, but their adsorption properties differed. The adsorption capacity of straw, chicken manure, and biochar was dramatically influenced by pH value, with an optimum pH of 5.0. The optimum pH for mushroom cultivation residue was 2.0, and pH value had a weaker effect on its Pb2+ adsorption capacity, as the adsorption capacity decreased smoothly as pH increased. At 25℃ and pH 5.0, all four materials quickly reached adsorption equilibrium, and the adsorption process could be well fitted by the pseudo-second-order kinetic model and Langmuir isotherm equation; the equilibrium adsorption capacity of biochar, at 411.52 mg·g-1, was much higher than that of the other materials. The maximum adsorption capacity of straw, chicken manure, and mushroom cultivation residue was 40.90, 41.82, 115.65 mg·g-1, respectively. |
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