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首页> 外文会议>International Conference on Environmental Science and Technology >(00168)The effect of the presence of zinc on the precipitation of CaCO3 from supersaturated solutions
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(00168)The effect of the presence of zinc on the precipitation of CaCO3 from supersaturated solutions

机译：（00168）锌的存在对超饱和溶液的CaCO3沉淀的影响

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Precipitation and dissolution processes of calcium carbonate in natural aquatic systems, are responsible not only for the regulation of pH but also for the transport of pollutants to and from sediments. Of interest in these processes, is the role of the presence of heavy metals in the aquatic environment. In the present work the mechanism of calcium carbonate formation from supersaturated solutions in the absence and presence of zinc (II)was investigated at 25°C, pH 8.50, 0.1M NaCl, at conditions of constant supersaturation. Kinetics analysis suggested that the precipitation of calcium carbonate both in the absence and in the presence of zinc over a concentration range 10-30 ?M, is controlled by surface diffusion. The presence of zinc in the supersaturated solutions reduced the rate of crystal growth of the calcite seed crystals and the rate reduction was smaller the higher the solution supersaturation. The inhibition was probably due to the adsorption of zinc species to the active sites of crystal growth of the seed crystals. Provided that the adsorption could be described according to the Langmuir model, the assumption was justified both by fitting kinetics data of calcium carbonate crystal growth and by independent equilibrium adsorption studies.
机译：天然水生系统中碳酸钙的沉淀和溶解过程，不仅负责pH调节，也负责沉积物的污染物的运输。对这些过程的兴趣，是水生环境中重金属存在的作用。在本作工作中，在恒定过饱和条件下，在25℃，pH 8.50,0.1M NaCl处，在不存在和存在下，在恒定和存在下，在不存在和存在下，在恒定过饱和的条件下，研究碳酸钙形成在不存在和存在的情况下。动力学分析表明，通过表面扩散控制在不存在和浓度范围内锌的碳酸钙沉淀。在过饱和溶液中存在锌的存在降低了方解石种子晶体的晶体生长速率，速率降低较小溶液过饱和。抑制可能是由于锌种对晶晶的晶体生长的活性位点的吸附。如果可以根据Langmuir模型描述吸附，通过拟合碳酸钙晶体生长的动力学数据和独立的平衡吸附研究，假设是合理的。

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