β-环糊精改性梧桐叶基生物炭对水中镉离子的去除研究

制备了以梧桐叶为原料的生物炭(BC),并用戊二醛作为交联剂,将β-环糊精负载在梧桐叶基生物炭上制备β-环糊精改性生物炭(β-BC)。采用比表面积分析和红外光谱对生物炭进行表征分析,并将其用于吸附水中的镉离子(Cd^(2+)),考察吸附时间、投加量、吸附剂用量和pH等不同因素对吸附性能的影响。实验结果表明,改性后的生物炭比表面积、总孔体积和平均孔径均稍有下降,β-BC对Cd^(2+)的去除率高达99.2%,比BC高14%,且更快达到吸附平衡。此外,BC对Cd^(2+)的吸附满足伪一级动力学方程模型,β-BC对Cd^(2+)的吸附满足Elovich方程模型,而Freundlich等温吸附模型对BC和β-BC均有更好的拟合效果。

Effect of Y_(2)O_(3 )Addition on Preparation and Properties of β-SiAlON Reticular Porous Ceramic Filters

β-Si Al ON reticular porous ceramics(Si_(6-Z)Al_(Z)O_(Z)N_(8-Z),Z=2)were prepared withα-Al_(2)O_(3),AlN and Si as raw materials and Y_(2)O_(3)as the sintering aid by the foam impregnation method.The influence of the Y_(2)O_(3)addition(0,3%,6%and 9%,by mass)on the microstructure and the properties of the samples was studied.The results show that the Y_(2)O_(3)addition is conductive to the sintering of samples and the growth of grains.The sample added with 6%Y_(2)O_(3)has the optimal properties:the apparent porosity of 82.9%,the bulk density of 0.53 g·cm^(-3),the cold compressive strength of 1.97 MPa,and the residual cold compressive strength of 1.68 MPa after oxidation,which can be used as porous ceramic filters.