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Characterization and Pb(II) removal potential of corn straw- and municipal sludge-derived biochars

机译:玉米秸秆和城市污泥衍生的生物炭的表征和去除Pb(II)的潜力

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摘要

Corn straw- and municipal sludge-derived biochars (CS-BC and MS-BC, respectively) were used to remove Pb(II) from aqueous solutions. Despite being pyrolysed at the same temperature (723 K), MS-BC showed higher porosity and hydrophobicity than CS-BC. The optimum biochar loading and pH values allowing efficient Pb(II) removal (greater than 80%) were 0.2 g l−1 and 7.0, respectively. The presence of PO43− (greater than 0.01 mol l−1) significantly affected the adsorptive performance of Pb(II) on the biochar samples. The adsorption data fitted well to a pseudo-second-order kinetic model and a Langmuir model, and the maximum Pb(II) adsorption capacities were 352 and 387 mg g−1 for CS-BC and MS-BC, respectively. The main mechanisms involved in the adsorption of Pb(II) on biochar were electrostatic attraction and surface complexation. When comparing both biochars, CS-BC showed better cost-effectiveness for the removal of Pb(II) from aqueous solutions.
机译:玉米秸秆和市政污泥衍生的生物炭(分别为CS-BC和MS-BC)用于从水溶液中去除Pb(II)。尽管在相同温度(723 K)下热解,MS-BC的孔隙率和疏水性均比CS-BC高。能够有效去除Pb(II)(大于80%)的最佳生物炭负荷和pH值分别为0.2 g l -1 和7.0。 PO4 3 − (大于0.01μmoll -1 )的存在显着影响了Pb(II)对生物炭样品的吸附性能。吸附数据很好地拟合了伪二级动力学模型和Langmuir模型,CS-BC和MS-的最大Pb(II)吸附容量分别为352和387 mg g -1 。公元前。生物炭吸附Pb(II)的主要机理是静电吸引和表面络合。当比较两种生物炭时,CS-BC对于从水溶液中去除Pb(II)表现出更好的成本效益。

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