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磁性镧基吸附剂的制备及其除磷效能研究
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Abstract:
输配水过程中，微生物的再生长往往会使水质恶化。相对于易产生有毒有害副产物的消毒法，本研究采用了更为绿色安全的营养源控制法，通过控制水中的磷源来达到实现水质生物稳定性的目的。首先，采用简单的浸渍–共沉淀法制备得到了磁性镧基吸附剂LFP，并探究了其除磷效果、影响因素及除磷机制，该吸附剂具有较高磷吸附容量(41.61 mgP·g？1)的同时，还具有较高的磷选择性和pH适应性，在pH 3~12均具有较高的磷吸附容量(22.88 mgP·g？1以上)。吸附过程符合Langmuir等温吸附模型及准二级动力学模型，吸附机制包含静电吸引及配体交换作用，此外，吸附剂具有较强的磁性(16.28 emu·g？1)，易实现磁分离，使其向实际应用更进一步。
The re-growth of microorganisms during water transmission and distribution often deteriorates water quality. Compared with the disinfection method, which is prone to produce toxic and harmful by-products, this study adopted a greener and safer nutrient source control method to achieve water quality biostability by controlling the phosphorus source in water. Firstly, the magnetic lanthanide-based adsorbent LFP was prepared by a simple impregnation-co-precipitation method, and its phosphorus removal effect, influencing factors and phosphorus removal mechanism were investigated. The adsorbent had a high phosphorus adsorption capacity (41.61 mgP·g？1) and also a high phosphorus selectivity and pH adaptability, and it had high phosphorus adsorption capacity (22.88 mgP·g？1) in the range of pH 3~12. The adsorption process was consistent with the Langmuir isothermal adsorption model and the quasi-secondary kinetic model, and the adsorption mechanism included electrostatic attraction and ligand exchange. In addition, the adsorbent possessed strong magnetism (16.28 emu·g？1), which was easy to realize the magnetic separation, and thus it was a step forward to the practical application.
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