In this paper,calcium alginate gel beads were prepared through a homemade microcapsule preparation system with multi-nozzles under forced high-voltage electrostatic field.The effect of operation parameters on the larg...In this paper,calcium alginate gel beads were prepared through a homemade microcapsule preparation system with multi-nozzles under forced high-voltage electrostatic field.The effect of operation parameters on the large-scale preparation of gel beads was analyzed.The results showed that the air pressure of feed was the decisive factor affecting the size and yield of gel beads,and the size distribution was dependent on several factors including the distribution of electric field,pulse potential,air pressure of feed,pulse frequency,pulse width and threshold potential.The gel beads with good sphericity,smooth surface and low dispersivity(CV<20%)can be prepared by adjusting and optimizing above parameters.It is more important that the yield of gel beads by the microcapsule preparation system is 20—40 folds higher than the traditional electrostatic droplet generator,which makes it possible to realize the large-scale preparation of gel beads.展开更多
研究海藻酸钠-钙凝胶球、海藻酸钠-铁(Ⅲ)凝胶球对废水中的铬(Ⅵ)的去除效果。结果表明:对50 m L(10 mg/L)的模拟废水进行吸附,海藻酸钠-铁(Ⅲ)凝胶球的吸附效果较好,而海藻酸钠-钙凝胶球对铬(Ⅵ)几乎不发生吸附作用。铬(Ⅵ)的去除率随...研究海藻酸钠-钙凝胶球、海藻酸钠-铁(Ⅲ)凝胶球对废水中的铬(Ⅵ)的去除效果。结果表明:对50 m L(10 mg/L)的模拟废水进行吸附,海藻酸钠-铁(Ⅲ)凝胶球的吸附效果较好,而海藻酸钠-钙凝胶球对铬(Ⅵ)几乎不发生吸附作用。铬(Ⅵ)的去除率随吸附时间的增加而提高,吸附240 min后,海藻酸钠-铁(Ⅲ)凝胶球对铬(Ⅵ)的去除率可达99%以上,海藻酸钠-铁(Ⅲ)凝胶球在酸性条件下比较稳定,在强碱性条件下易被分解,海藻酸钠-铁(Ⅲ)凝胶球吸附铬(Ⅵ)的吸附等温线符合Langmuir型,最大吸附量为11.827 mg/g。利用海藻酸钠-铁(Ⅲ)凝胶球去除废水中的铬(Ⅵ)具有工艺简单、处理效率高、速度快等优点。展开更多
文摘以海藻酸钠水凝胶为骨架,结合壳聚糖和磁性Fe_3O_4,开发出一种新型的磁性壳聚糖/海藻酸钠复合凝胶球(MCSB)制备方法,并通过正交试验和单因素实验,探究不同制备条件对复合凝胶球制备效果的影响,确定最优制备条件:CaCl_2浓度为2.5 g/L,海藻酸钠浓度为24 g/L,壳聚糖添加量为5 g/L,磁流体添加量为4.64g/L。制备出的凝胶球表面光滑,大小均匀,纯黑色,呈球形,直径在2 mm左右,具有顺磁性。通过傅里叶变换红外光谱(FTIR)、同步热分析(TGA)等手段对凝胶球进行表征。结果表明,MCSB的热稳定性良好,凝胶球表面的活性基团主要有羟基、氨基、羧基等。吸附性能实验表明,当MCSB用量为20 mg时,对40 m L 25mg/L Cu^(2+)溶液的吸附去除率为78.13%,表明磁性壳聚糖/海藻酸钠复合凝胶球是一种制备简单、效果良好的新型复合吸附剂。
文摘In this paper,calcium alginate gel beads were prepared through a homemade microcapsule preparation system with multi-nozzles under forced high-voltage electrostatic field.The effect of operation parameters on the large-scale preparation of gel beads was analyzed.The results showed that the air pressure of feed was the decisive factor affecting the size and yield of gel beads,and the size distribution was dependent on several factors including the distribution of electric field,pulse potential,air pressure of feed,pulse frequency,pulse width and threshold potential.The gel beads with good sphericity,smooth surface and low dispersivity(CV<20%)can be prepared by adjusting and optimizing above parameters.It is more important that the yield of gel beads by the microcapsule preparation system is 20—40 folds higher than the traditional electrostatic droplet generator,which makes it possible to realize the large-scale preparation of gel beads.
