STUDY ON HEAVY METAL ADSORPTION TO COASTAL SEDIMENT OF THE YELLOW RIVER ESTUARY
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摘要: 以黄河口海域表层沉积物为研究对象,研究沉积物对重金属Cu、Pb的吸附特性,将沉积物筛分为4种粒级,探讨粒度、pH值、吸附时间和吸附剂初始浓度对重金属吸附的影响。结果表明:沉积物粒径越小,对重金属的吸附量越大;吸附平衡时间有所差异,但在1.5 h均能达到吸附平衡;吸附量均随pH值升高而逐渐增加,但铜的吸附较铅的吸附速度快;铜的吸附量与吸附剂初始浓度呈线性关系,而铅的吸附量在初始浓度较低时变化明显,随初始浓度增加吸附量增加减小;沉积物对铜吸附等温线符合Langmuir型,铅吸附等温线符合Freundlich型,吸附类型存在差异。重金属在沉积物中的吸附规律研究为黄河口海域污染调查及治理提供了科学依据。Abstract: The surface sediments of the Yellow River estuary are selected as the research objects to study the adsorption characteristics of Cu and Pb in the coastal sediments. The sediments are screened out into four gradational granularities to discuss the effects of granularity, pH, adsorption time and initial concentration of sorbents. The results indicate that:the smaller the granularity is, the bigger the saturated adsorption capacity is.The adsorption equilibrium time of Cu2+and Pb2+ is different, but all can achieve adsorption equilibrium in 1.5 h.The adsorption capacity increases gradually along with pH, that of Cu2+ in sediments increases rapidly, but that of Pb2+ increases slowly. The adsorption capacity of Cu2+ assumes a linear relation with initial concentration of absorbent basically, that of Pb2+ increases rapidly under lower initial concentration of absorbent, but then becomes lower along with initial concentration. The adsorption capacity of Cu2+and Pb2+ increases along with the equilibrium concentration, that of Cu2+ increases rapidly, but that of Pb2+ increases rapidly when the equilibrium concentration is relatively lower, then it tends to slow down along with the concentration. The adsorption isotherms of Cu2+ in sediments conform to Langmuir type relatively while those of Pb2+ conform to Freundlich type,and the adsorption types are different. The regularity of heavy metal adsorption in coastal sediment provides the basis for investigation and management of marine pollution in the Yellow River estuary.
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Key words:
- heavy metal /
- sediments /
- adsorption /
- isotherms
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