Reusable and efficient clay material for the fixed-bed neodymium recovery

Neodymium is an essential resource for the future development of clean energy. Its future supply is a global concern motivating the application of different adsorbent materials to recover neodymium from secondary sources. However, there is a lack of studies of adsorption with scale-up potential. This work aims to recuperate neodymium from aqueous solution through dynamic adsorption in a fixed-bed of expanded vermiculite, an abundant clay mineral with excellent adsorbent properties. For that, the flow rate and concentration optimization, mathematical modeling; cycles of adsorption and desorption; and the extensive characterization of the regenerated adsorbent matrix were carried out. The main findings of the study are the column high adsorption capacity 0.40 mmol/g; the effective modeling of the column by Thomas and DualSD model, being useful for scale-up purposes; the constant bed efficiency along with the cycles and the well succeed neodymium recovery (96% in the third cycle) and concentration (28.4 times). Besides that, the structural composition was maintained, attesting to the physical and chemical stability of the material. Thus, the neodymium continuous recovery from aqueous solution through successive cycles of adsorption and desorption on an expanded vermiculite fixed-bed has high potential for scale-up and rare earth rich wastewater treatment studies.     

一测多评结合内标加入法测定吐根及其制剂中生物碱类成分的含量

目的建立以盐酸小檗碱为加入内标,测定吐根药材及其制剂中盐酸吐根碱、盐酸吐根酚碱的一测多评测定方法。方法采用高效液相色谱法,以Capcell pak C_(18) MGⅡ(250 mm×4.6 mm,5μm)为色谱柱,乙腈(A)-体积分数0.1%磷酸溶液(B)为流动相,梯度洗脱,流速为1.0 mL·min~(-1),柱温30℃,检测波长为205 nm。以外加的盐酸小檗碱为内参物,分别建立盐酸吐根碱、盐酸吐根酚碱的相对校正因子,利用该相对校正因子计算药材及其制剂中该两种成分的量;同时利用外标法测定盐酸吐根碱、盐酸吐根酚碱的量,比较两种测定方法的差异,采用方差分析比较不同产地吐根药材的两种成分的含量差异。结果在线性范围内,盐酸小檗碱与盐酸吐根碱、盐酸吐根酚碱的相对校正因子分别为0.499 5、0.439 2,在不同实验条件下相对校正因子重现性良好,两种生物碱类成分的计算值与实测值无显著性差异。结论采用一测多评法测定吐根药材及其制剂中生物碱类成分准确且可行,可用于吐根药材及其制剂的质量控制。     

新型材料PLLA-脱细胞软骨粒支架的制备及性状研究

目的:以聚左旋乳酸(PLLA)和猪的脱细胞软骨粒混合物为材料制备一种新型的支架,即PLLA-脱细胞软骨粒支架,并对其性状进行研究,从而为软骨组织工程提供一种新的支架材料。方法:利用热相致分法(T IPS法)制备PLLA与脱细胞软骨粒在不同混合比例、不同温度下的聚合物支架,并对各种支架的孔径大小、孔隙率、水结合力、生物力学性状、降解率等进行探讨。结果:PLLA-脱细胞软骨粒支架具有与天然软骨基质相近的成分与结构,其各种性状基本符合软骨支架的要求。结论:PLLA-脱细胞软骨粒支架可作为软骨组织工程良好的细胞外基质材料。     

苦参总生物碱固体脂质纳米粒的制备工艺研究

目的 探索苦参总生物碱(TA)磷脂复合物固体脂质纳米粒(TA-PC-SLN)的制备工艺及处方优化,并对其进行体外评价.方法 建立高效液相色谱(HPLC)法同时测定TA中4个指标成分苦参碱(MT)、氧化苦参碱(OMT)、槐果碱(SC)、氧化槐果碱(OSC),并进行方法学验证.称取TA、卵磷脂共同溶于乙醇制备磷脂复合物;采...