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贻贝是我国的重要的海产经济贝类,但由于养殖规模的增大而随之产生的废弃贻贝壳资源成为了关注的热点。研究发现贻贝壳是一种环境友好型的生物吸附剂,本文通过高温煅烧处理,进一步优化了贻贝壳的吸附性能,采用SEM、BET、XRD和IR表征手段对贻贝壳的微结构、孔径及组成进行了分析;同时探讨了贝壳粉吸附剂对Cd~(2+)和Pb~(2+)的吸附热力学性能。结果发现贻贝壳粉经高温煅烧后,其主要成分为Ca O,且比表面积显著增大,比表面积达7.8965 m~2/g,形成诸多纳米孔径,直径在0.5~1.1 nm,吸附性能提高。贻贝壳吸附剂用量和溶液p H对Cd~(2+)和Pb~(2+)的吸附量影响较大,吸附剂对Cd~(2+)的吸附量明显高于对Pb~(2+)的吸附量,且吸附剂对Cd~(2+)和Pb~(2+)的吸附均符合Freundlich等温吸附模型。由此可知,煅烧后的紫贻贝壳是一种优良廉价的生物吸附剂,可将其开发成一种针对性去除废水中重金属Cd~(2+)的新型吸附剂。
Mussels is an important seafood economy shellfish in our country, but due to the increase of farming scale, the resulting mussel shell resources have become the focus of attention. The study found that the mussel shell is an environmentally friendly biosorbent. In this paper, the adsorption properties of the mussel shell were further optimized by high temperature calcination. The microstructure, pore size and composition of the mussel shell were characterized by SEM, BET, XRD and IR The adsorption thermodynamic properties of Cd 2+ and Pb 2+ were also discussed. The results showed that when the shell powder was calcined at high temperature, its main component was CaO, and the specific surface area was significantly increased. The specific surface area reached 7.8965 m ~ 2 / g, which formed many nano-pores with diameter of 0.5-1.1 nm and improved adsorption performance. The amount of adsorbent in mussel shell and solution p H had a significant influence on the amount of Cd 2+ and Pb 2+ adsorption, and the adsorption capacity of adsorbent on Cd 2+ was higher than that of Pb 2+ +) Adsorption, and the adsorption of Cd 2+ and Pb 2+ by adsorbents are in accordance with the Freundlich adsorption isotherm model. It can be seen that the purple mussel shell after calcination is an excellent and cheap biosorbent that can be developed into a new type of adsorbent specifically targeted to remove heavy metal Cd2 + in wastewater.