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研究了趋磁性细菌MTB吸附Pb2+的主要影响因素。在室温范围内,温度对吸附几乎无影响,而体系的pH值和吸附时间等的影响较为重要。并运用Langmu ir和Freund lich等模型对实验数据进行了拟合,获得了各种模型参数,结果表明Langm iur模型能较好地反应实验数据。 相似文献
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壳聚糖对重金属离子吸附的研究 总被引:13,自引:0,他引:13
研究了壳聚糖对溶液中重金属离子:Zn^2+,Ag^+,Pb^2+,Cd^2+,C^2+的吸附行为。测定和计算了不同条件下壳聚糖对重金属离子的吸附量,讨论了不同条件下壳聚糖对重金属离子的吸附情况,实验结果表明,壳聚糖能较好的吸附溶液中重金属离子。 相似文献
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细菌纤维素(BC)是一种由微生物发酵制备的纤维素,具有独特的结构和物理化学性质。BC分子存在大量的羟基,具有超细网状纳米纤维结构,比表面积高,对溶液中金属离子有良好的吸附性能。本文对细菌纤维素制备条件(菌种、常用碳源及助剂)、细菌纤维素吸附重金属离子及机理的研究进展进行了总结及展望。 相似文献
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以波罗蜜外壳为前驱体,以氨水为活化剂制备了波罗蜜基活性炭,并考察了不同碳化温度、不同吸附条件下的活性炭吸附性能,结果表明:最佳的碳化温度为400℃,此时活性炭具有较大的比表面积和较好的吸附性能;最优的吸附条件是,吸附温度为40℃,吸附溶液pH值为4,吸附时间为40 min,在此条件下锌离子、镍离子的吸附去除率分别达到89.71%和83.18%;锌、镍离子共存条件下,彼此存在竞争吸附关系。 相似文献
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Magnetotactic bacteria (MTB) as biosorbents for the adsorption of Au(Ⅲ) and Cu(Ⅱ) ions from aqueous solution have been investigated. The optimum adsorption conditions for both metal ions were the initial pH scope of 1-5.5 for Au(Ⅲ) and 2.0-4.5 for Cu(Ⅱ), room temperature, biomass concentration of 10.0g.L^-1 and sorotion du-ration more than 10 min. When the initial metal concentration were within 500mg.L^-1, the maximum biosorption capacity of 1.0g of MTB (dry mass basis) for Au(Ⅲ) and Cu(Ⅱ) were calculated as 505.2mg of Au(Ⅲ) and 493.1mg of.Cu(Ⅱ) by Langmuir model in single system, respectively. The isotherm equilibrium of Au(Ⅲ) and Cu(Ⅱ) ions in the Au-Cu binary system reflected a unique phenomenon that the adsorption of Au(Ⅲ) was rein-forced and that of Cu(Ⅱ) prohibited, compared respectively-with their performances in the single metal system.When the,concentration of-Au(Ⅲ) and Cu(Ⅱ). were below 80mg.L^-1, the waste waterafter MTB treating, wasbelow 1.0mg.L^-1, which is in conformity with Environmental Performance Standards (EPS) of Canada. Besides, all the kinetic data were fitted well to the pseudo second-order kinetic model with a high correlation coefficient (R^2〉0.999). 相似文献
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介绍了趋磁性细菌(MTB)的磁特性,依据MTB的培养方法对取回的活性污泥进行了三种不同培养条件下的富集,培养了一个月后,用MPN法测了三种污泥中MTB的量,结果表明,微好氧条件下MTB的量最多。用三种污泥分别吸附Pb2 + 、Cr3 + 、Cu2 + 和Zn2 + ,结果表明,微好氧培养条件下的污泥吸附的效果最好,去除率几乎达到10 0 %。对Cr6+ 、Fe3 + 、Fe2 + 和Ni2 + 也有较好的去除效果。 相似文献
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将黏胶纤维在一定条件下进行羧甲基化改性,探讨了改性黏胶纤维对重金属离子Cu2+、Ni2+的吸附性能,以及黏胶的取代度、pH值、吸附温度及吸附时间对吸附性能的影响,同时研究了吸附动力学。结果表明,改性黏胶对两种离子都有良好的吸附性能,其中Ni2+的最佳吸附条件为:pH=5,温度50℃,饱和吸附量167 mg/g;Cu2+的最佳吸附条件为:pH=4~5,饱和吸附量108 mg/g;吸附重金属离子的改性黏胶纤维在pH<2时迅速解析,可循环利用。 相似文献
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《分离科学与技术》2012,47(7):1063-1069
In this study, copper oxide nano particles were synthesized by batchwise supercritical hydrothermal method. After preparation of CuO nano particles, they were immobilized into the porous matrix of sodium alginate. The drying process formed a very porous structure that is useful for enhancing of adsorption activity. Produced CuO particles were characterized by X-ray diffractometery (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and BET for measuring the surface area. The prepared materials were then used as adsorbent in the removal of toxic metal ions in aqueous solution. To optimize the adsorption system, the effect of various parameters such as adsorbent type and dose, temperature, pH, and time on the adsorption were studied. 相似文献
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