双氰胺甲醛改性汉麻纤维吸附剂的制备及对阴离子染料的吸附  

Preparation of dicyandiamide formaldehyde modifiedhemp fiber adsorbent and its adsorption of anionic dyes

作　　者：张洛红[1] 刘云姣 胡议心 兰一峰 ZHANG Luohong;LIU Yunjiao;HU Yixin;LAN Yifeng(School of Environmental and Chemical Engineering,Xi'an Polytechnic University,Xi'an 710600,China)

机构地区：[1]西安工程大学环境与化学工程学院,西安710600

出　　处：《功能材料》2024年第11期11227-11236,共10页Journal of Functional Materials

基　　金：国家自然科学基金项目(22078253);陕西省重点研发计划项目(2022GY-161)。

摘　　要：针对双氰胺甲醛(DDF)对染料废水脱色时pH适用范围狭窄、难分离回收等问题,采用3-氨丙基三乙氧基硅烷(APTES)偶联剂将DDF接枝到汉麻纤维(HF)上,制备一种适用于去除阴离子染料的广域pH高效吸附剂(HF-APT-DDF)。考察了不同因素对单一组分和混合组分下刚果红(CR)、酸性兰9(AO 9)和活性嫩黄K-6G(RBY K-6G)3种染料吸附性能的影响。结果表明:HF-APT-DDF在pH=4~10的范围内均具有良好的脱色效果;在温度为298 K、染料初始浓度为20 mg/L、pH为8、吸附时间为1.5 h、投加量为1.0和1.4 g/L时,HF-APT-DDF对单一组分和混合组分染料的脱色率均超过97%,对CR、AO 9和RBY K-6G的最大吸附量分别为116.62,80.16和103.86 mg/g;5次循环使用后,HF-APT-DDF脱色率仍在80%以上;无机盐离子对吸附性能的影响从大到小为PO_(4)^(3-)>CO_(3)^(2-)>SO_(4)^(2-)>NO_(3)^(-)>Cl^(-);HF-APT-DDF对染料的吸附是自发的放热过程,遵循准二级动力学模型和Langmuir等温吸附模型。In response to the narrow pH application range and difficult separation and recovery of dicyandiamide formaldehyde(DDF)for decolorization of dye wastewater,a wide area pH efficient adsorbent(HF-APT-DDF)suitable for removing anionic dyes was prepared by grafting DDF onto hemp fiber(HF)using 3-aminopropyltriethoxysilane(APTES)coupling agent.We investigated the effects of different factors on the adsorption performance of three dyes,congo red(CR),acid blue 9(AO9),and reactive yellow K-6G(RBY K-6G),under single and mixed components.The results show that HF-APT-DDF has good decolorization effect in the pH range of 4-10.At a temperature of 298 k,initial dye concentration of 20 mg/L,pH of 8,adsorption time of 1.5 h,and dosage of 1.0 g/L and 1.4 g/L,the decolorization efficiency of HF-APT-DDF for single and mixed component dyes exceeded 97%.The maximum adsorption capacities for CR,AO9,and RBY K-6G were 116.62 mg/g,80.16 mg/g,and 103.86 mg/g,respectively.After 5 cycles of use,the decolorization rate of HF-APT-DDF is still above 80%.The influence of inorganic salt ions on adsorption performance ranges from large to small:PO_(4)^(3-)>CO_(3)^(2-)>SO_(4)^(2-)>NO_(3)^(-)>Cl^(-).The adsorption of dyes by HF-APT-DDF is a spontaneous exothermic process,following the quasi second order kinetic model and Langmuir isotherm adsorption model.

关 键 词：双氰胺甲醛 汉麻纤维 阴离子染料 吸附 改性 

分 类 号：X506[环境科学与工程—环境工程]