基于原位硫酸钡杂化直接染料制备阳离子染料废水处理的高效吸附剂

The increase of the active sites is an important factor to improve the adsorption properties of inorganic/organic hybrid adsorbent, and the selection and regulation of the inorganic ligand is the critical factor to increase the active sites of the adsorbent. The previous results indicated that the different inorganic framework materials can not only adjust the stability of the adsorbent but also achieve to maximize immobilized of the active component. Therefore, we propose the following hypothesis: inorganic framework has an important role in the regulation of the practical application of inorganic/organic hybrid adsorbents in wastewater treatment. The objective of this work is to establish a new-type wastewater treatment method by in situ hybriding waste direct dyes into a harmless inorganic skeleton BaSO4 for preparation the high effective adsorbent for treatment the cationic dyes wastewater. The morphology, composition and structure of the hybrid adsorbent will be characterized and tested by by a variety of analytical techniques and testing means. The occurrence mechanism of barium in situ hybriding dyes will be elucidated. The mechanism of adsorption of pollutants will be clarified by using the Langmiur and Frendlich isotherm for fitting or the other's interaction law. The effects of inorganic ligand on adsorption properties will be revealed. The project will deeply investigate the optimal synthesis conditions of the adsorbent and the optimum process parameters of treatment cationic dye wastewater. This work will provid a convenient, cost-effective and environment-friendly wastewater treatment with "Using Waste to Treat Waste" for the large-scale production of a cost-effective sorbent. The project will lay a useful theoretical basis for the environmentally friendly processing of the high concentration of organic industrial wastewater.

活性位点的增加是提高无机/有机杂化吸附剂吸附性能的重要因素，而无机配体的选择与调控是增加吸附剂活性位点的关键因素。项目组前期成果表明，无机骨架材料的不同既可以调节吸附剂稳定性，又可以实现活性组分的最大化固载。鉴于此，我们提出如下假说：无机骨架材料对无机/有机杂化吸附剂的实际应用具有重要的调控作用。本研究拟选择难溶于酸碱的硫酸钡作为无机骨架材料，通过原位杂化固载直接染料废水，进而制备阳离子染料废水处理的高效吸附剂。通过各种分析技术和测试手段测定吸附剂的组成，表征吸附剂的结构，利用langmiur、Frendlich等模型阐明吸附剂的吸附机理，揭示硫酸钡原位杂化染料的发生机制以及硫酸钡提高吸附剂吸附性能的原理，探究吸附剂制备及阳离子染料废水处理的最佳工艺参数，建立直接染料废水与阳离子染料废水协同治理的新方法，为高浓度有机工业废水的环境友好处理进行有益的尝试性研究。

本课题研究选择难溶于酸碱的硫酸钡、碳酸钙和氟化钙作为无机骨架材料，通过原位杂化固载直接染料如直接大红4BE、直接枣红B和直接橙S等，制备一类阳离子染料废水处理的高效吸附剂。通过各种分析技术和测试手段测定吸附剂的组成，表征吸附剂的结构，揭示硫酸钡原位杂化染料的发生机制。采用振荡吸附法，研究了染料的初始浓度、吸附时间、体系pH和温度等因素对杂化材料吸附染料的影响。此外，通过研究杂化材料吸附剂对乙基紫(EV)、亚甲基蓝(MB)和碱性艳兰BO(BBBO)的吸附等温曲线、吸附动力学和热力学行为，探讨了该杂化吸附材料对阳离子染料的吸附机理。结果表明：（1）吸附阳离子的最佳条件：pH≈7、反应温度在308K、吸附时间约15 min、杂化吸附材料最佳投入量为0.5~2 g/L、染料初始浓度为100-200 mg/L，去除率一般大于85%。（2）动力学模型研究结果表明：整个吸附过程符合二级动力学吸附，主要速率控制步骤是化学反应。（3）其△G＜0，△Hθ>0，△Sθ>0，表明杂化材料对染料的吸附是自发的、吸热的过程，升温有利于反应的进行。此外，实际废水处理结果表明：该类杂化吸附材料适用于高浓度染料废水处理。该类杂化吸附材料制备与应用，建立了直接染料废水与阳离子染料废水协同治理的新方法，为高浓度有机工业废水的环境友好处理进行有益的尝试性研究。项目资助下已发表论文7篇（SCI论文4篇，EI论文1篇），待发表两篇。项目投入经费25万元，支出22.0595万元，各项支出基本与预算相符。剩余经费2.9405万元，剩余经费计划用于本项目研究后续支出。