埃洛石负载硫脲及其甲醛捕捉效果

研究了一种新型甲醛捕捉剂的制备方法及其除醛性能,用尿素插层埃洛石纳米管(HNTs),扩大其层间距,提高负载量,并通过真空负载制备埃洛石/尿素/硫脲纳米复合物.同时,将制备的纳米复合物分别在溶液和空气中测试吸附甲醛的效果,并通过紫外分光光度法和4-氨基-3-联氨-5-巯基-1,2,4-三氮杂茂(AHMT)显色法结合RGB取色法测试其对甲醛的吸附效果.结果表明,尿素能插层活化埃洛石纳米管,使其层间距由0.720 nm增加到1.070 nm,从而使硫脲负载量达到27.41%;埃洛石/尿素/硫脲在甲醛水溶液中吸附甲醛的过程符合Freundlich等温吸附模型;纳米复合物在甲醛水溶液中的除醛率可达60%,随着添加量的增加,埃洛石/尿素/硫脲纳米复合物对甲醛的吸附效果逐渐增强.

Halloysite loaded with thiourea and its capacity on capturing formaldehyde

In this study, a new kind of formaldehyde capturing material was prepared and its formaldehyde capturing capacity was tested. Halloysite nanotubes (HNTs) were intercalated with urea in order to increase its layer spacing and loading capacity, then thiourea was loaded in halloysite nanotubes through vacuum loading system, and HNTs/urea/thiourea nano-composite was prepared. The formaldehyde capturing capacity of the nano-composite was tested respectively in aqueous solution and air condition, using the UV-Vis and 4-amino-3-hydrazino-5-mercapto-1,2,4-triazol (AHTM) coloration method. The results showed that urea was successfully intercalated into HNTs, with an increased layer spacing of 1.070 nm and a higher thiourea loading content of 27.41%. The adsorption model of the nano-composite in formaldehyde aqueous solution follows the Freundlich adsorption isotherm model. The results showed that the formaldehyde removal rate could reach 60%, and the formaldehyde capturing capacity of HUT increased gradually with its dosage.