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The adsorption and desorption of algae Cladophora fascicularis and their relation with initial Cd^2＋ concentration, initial pH, and co-existing ions were studied. Adsorption equilibrium and biosorption kinetics were established from batch experiments. The adsorption equilibrium was adequately described by the Langmuir isotherm, and biosorption kinetics was in pseudo-second order model. The experiment on co-existing ions showed that the biosorption capacity of biomass decreased with an increasing concentration of competing ions. Desorption experiments indicated that EDTA was efficient desorbent for recovery from Cd^2＋. With high capacities of metal biosorption and desorption, the biomass of Cladophora fascicularis is promising as a cost-effective biosorbent for the removal of Cd^2＋ from wastewater. 相似文献
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为跟踪2004年6月19日至7月13日实施的黄河第三次调水调沙工程,2004年7月21日于东营胜利黄河大桥站位采集水样。对黄河下游悬浮物浓度、粒度分布进行了分析。结果表明,当天本站位悬浮物质量浓度为1.43 g/L,悬浮颗粒物粒度在63μm以下部分累积分布占99.3%。作者模拟汛期黄河下游河水的悬浮物浓度、年平均水温及pH,研究悬浮物对重金属Cu2 的吸附规律,并探讨了悬浮物浓度及盐度对吸附的影响。Cu2 在水体中会由于水解、絮凝、沉淀、络和等损失一部分,在研究吸附时对此部分进行了扣除。水体悬浮颗粒物对重金属Cu2 的吸附等温线吸附符合Langmuir方程。随悬浮物浓度的增加,其对Cu2 的吸附容量增大,吸附量减小。悬浮物浓度、pH一定时,在盐度为0~5时,吸附量随盐度的升高而迅速降低,当盐度在5~25时,吸附量基本不变。 相似文献
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Heavy metals pollution in Jiaozhou Bay was studied in Ruditapes. philippinarum, a bioindicator of seawater pollution. Heavy metals in soda industry wastes “white mud” were also studied. Comparison of microwave digestion method with general digestion method revealed that microwave digestion is superior to general digestion in precision, recovery, digestion speed and efficiency, etc. Cd concentration in Hongdao R.philippinarum samples exceeded the national standard by 0.046 mg/kg, that of Yinghai sample by 0.02 mg/kg,and that of Hongshiya sample by 0.22 mg/kg. Sample Pb concentration in Hongshiya was found to exceed the national standard by 0.02 mg/kg. However the heavy metals concentration in R. philippinarum near the Qingdao Alkaline Factory was complied with the standard. This was proved by Penaeus chinensis culture experiment.Therefore, the possible contamination source may come from other land areas. 相似文献
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