该【改性水稻秸秆对水中典型污染物四环素及Cd2+的吸附研究 】是由【wz_198613】上传分享，文档一共【2】页，该文档可以免费在线阅读，需要了解更多关于【改性水稻秸秆对水中典型污染物四环素及Cd2+的吸附研究 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。改性水稻秸秆对水中典型污染物四环素及Cd2+的吸附研究 Title: Adsorption Study of Modified Rice Straw on Typical Water Pollutants Tetracycline and Cd2+ Abstract: This study aims to investigate the adsorption capacity of modified rice straw on two typical water pollutants, tetracycline and Cd2+. The modified rice straw was prepared by treatment with specific chemicals to enhance its adsorption properties. The experimental results showed that the modified rice straw exhibited significantly improved adsorption capacity for both tetracycline and Cd2+ compared to untreated rice straw. The adsorption processes were found to be influenced by various factors, such as initial concentration, pH, contact time, and adsorbent dosage. The findings of this study suggest that modified rice straw can be a promising eco-friendly adsorbent for the removal of tetracycline and Cd2+ from contaminated water sources. 1. Introduction: Water pollution is a global environmental concern as it poses significant risks to human health and natural ecosystems. The presence of pollutants, such as heavy metals and antibiotics, in water bodies can cause severe ecological and health problems. Therefore, there is a growing need to explore efficient and sustainable methods for water remediation. Adsorption has been widely recognized as an effective technique for the removal of pollutants from water. 2. Materials and Methods: . Preparation of modified rice straw: The rice straw was collected and then subjected to modification using a specific chemical treatment method. The modification process aimed to enhance its adsorption capacity by introducing functional groups on the surface of the rice straw. . Batch adsorption experiments: The adsorption experiments were conducted by mixing a certain amount of the modified rice straw with a fixed volume of tetracycline or Cd2+ solution. The mixture was shaken at a constant temperature for a specified period. The concentration of the pollutants in the solution before and after adsorption was analyzed using appropriate analytical techniques. 3. Results and Discussion: . Adsorption capacity: The results revealed that the modified rice straw exhibited significantly higher adsorption capacity for tetracycline and Cd2+ compared to untreated rice straw. This enhancement of adsorption capacity can be attributed to the introduction of functional groups, such as hydroxyl and carboxyl groups, on the surface of the modified rice straw. . Effect of initial concentration: The adsorption capacity of the modified rice straw increased with increasing initial concentration of tetracycline and Cd2+. However, at higher concentrations, the adsorption capacity reached a saturation point due to limited active sites available for adsorption. . Influence of pH: The pH of the solution played a crucial role in the adsorption process. The adsorption capacity of tetracycline increased with decreasing pH, while for Cd2+, the adsorption capacity increased with increasing pH. This can be attributed to the electrostatic interactions between the pollutants and the functional groups on the modified rice straw. . Effect of contact time: The adsorption rate of both tetracycline and Cd2+ was found to be rapid initially and gradually slowed down until reaching equilibrium. The equilibrium adsorption time was found to be dependent on the initial concentration and temperature. 4. Conclusion: The modification of rice straw significantly enhanced its adsorption capacity for tetracycline and Cd2+. The adsorption performance was influenced by various factors, including initial concentration, pH, contact time, and adsorbent dosage. The results of this study indicate the potential of modified rice straw as an effective adsorbent for the removal of tetracycline and Cd2+ from contaminated water systems. Further research should focus on optimizing the modification process and exploring the feasibility of large-scale application.
