甲基橙/水滑石复合颜料制备与表征
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摘要
采取共沉淀法制备不同阴离子插层的锌铬水滑石(ZnCr-LDHs),通过ZnCr-LDHs吸附甲基橙(MO)制备有机-无机复合颜料。采用XRD、FT-IR和TG-DTA对不同阴离子插层的ZnCr-LDHs结构和热稳定性能进行表征,研究了吸附剂种类、吸附温度、MO初始浓度和溶液pH值等因素对复合颜料中MO吸附量的影响。研究结果表明:ZnCr-LDHs结构参数的差异与插层阴离子的种类、电荷和空间结构有关,并影响其对MO的吸附量。ZnCr-CO_3-LDHs的层间距最小,但对MO的吸附容量最大,ZnCr-CO_3-LDHs吸附MO至层板上形成复合颜料。当反应温度313 K,MO初始浓度为100 mg·L~(-1),吸附时间为2 h时,制备得到的复合颜料中MO吸附容量为88.56 mg·g~(-1)。酸性条件下ZnCr-CO_3-LDHs对MO的吸附容量明显高于碱性条件下,溶液初始pH值为3时,吸附容量达到最大值为190.93 mg·g~(-1)。
Zinc chromium hydrotalcites with different intercalation anion(ZnCr-LDHs)were prepared by co-precipitation method,and methyl orange(MO)pigment was adsorbed to ZnCr-LDHs to prepare composite pigment.The structure and thermal stability of ZnCr-LDHs with different intercalation anions were characterized by XRD,FT-IR and TG-DTA.The effects of absorbent type,adsorption temperature,and initial concentration of MO and pH value on the adsorption capacity of MO in composite pigments were discussed.The results showed that the differences in structural parameters of ZnCr-LDHs was related to the type,charge and spatial structure of intercalated anions,and also affected its adsorption capacity to MO.ZnCr-CO_3-LDHs had the smallest interlayer spacing but had the largest adsorption capacity for MO.In addition,ZnCr-CO_3-LDHs adsorbed MO onto the laminate to form composite pigments.When the reaction temperature was 313 K,the initial concentration of MO was 100 mg·L~(-1),and the adsorption reaction time was 2 h,the adsorption capacity of MO in the composite pigment reached 88.56 mg·g~(-1).The adsorption capacity of ZnCr-CO_3-LDHs to MO under acidic conditions was significantly higher than that under alkaline conditions.When the pH value of solution was 3,the adsorption capacity reached the maximum value of 190.93 mg·g~(-1).
Zinc chromium hydrotalcites with different intercalation anion(ZnCr-LDHs)were prepared by co-precipitation method,and methyl orange(MO)pigment was adsorbed to ZnCr-LDHs to prepare composite pigment.The structure and thermal stability of ZnCr-LDHs with different intercalation anions were characterized by XRD,FT-IR and TG-DTA.The effects of absorbent type,adsorption temperature,and initial concentration of MO and pH value on the adsorption capacity of MO in composite pigments were discussed.The results showed that the differences in structural parameters of ZnCr-LDHs was related to the type,charge and spatial structure of intercalated anions,and also affected its adsorption capacity to MO.ZnCr-CO_3-LDHs had the smallest interlayer spacing but had the largest adsorption capacity for MO.In addition,ZnCr-CO_3-LDHs adsorbed MO onto the laminate to form composite pigments.When the reaction temperature was 313 K,the initial concentration of MO was 100 mg·L~(-1),and the adsorption reaction time was 2 h,the adsorption capacity of MO in the composite pigment reached 88.56 mg·g~(-1).The adsorption capacity of ZnCr-CO_3-LDHs to MO under acidic conditions was significantly higher than that under alkaline conditions.When the pH value of solution was 3,the adsorption capacity reached the maximum value of 190.93 mg·g~(-1).
引文
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[17]Xia S J,Liu F X,Ni Z M,et al.Layered double hydroxides as efficient photocatalysts for visible-light degradation of Rhodamine B[J].J Colloid Interface Sci,2013,405:195–200.
[18]夏燕,朱润良,陶奇,等.阴离子表面活性剂改性水滑石吸附硝基苯的特性研究[J].环境科学,2013,34(1):226–230.
[19]王絮,于洪波,刘赛月,等.镁铝水滑石焙烧产物对甲基橙溶液的吸附性能[J].硅酸盐通报,2013,32(10):1984-1988.
[20]王澜,葛圣松,邵谦,等.锌镍铝水滑石微球的制备及吸附性能[J].无机化学学报,2016,32(11):1896-1904.
[2]沈永嘉.有机颜料系列讲座(3)-有机颜料的分子结构和晶体结构对其应用性能的影响[J].上海染料,2008,36(2):28-36.
[3]Parida K,Mohapatra L.Recent progress in the development of carbonate-intercalated Zn/Cr LDH as a novel photocatalyst for hydrogen evolution aimed at the utilization of solar light[J].Dalton Transactions,2012,41(4):1173-1178.
[4]仇满德,韩庆娇,崔炎龙,等.Co-MgAl三元类水滑石的合成、微结构及吸附性能研究[J].人工晶体学报,2017,46(8):1527-1533.
[5]Yang W,Kim Y,Liu P K T,et al.A study by in situ techniques of the thermal evolution of the structure of a Mg–Al–CO3,layered double hydroxide[J].Chemical Engineering Science,2002,57(15):2945-2953.
[6]Gaini L E,Lakraimi M,Sebbar E,et al.Removal of methyl orange dye from water to zinc-aluminium-chloride layered double hydroxides[J].Journal of Optoelectronics&Advanced Materials,2008,10(6):1415-1420.
[7]毕浩宇,李燕,周丹,等.磁性镁铝类水滑石的制备及其对甲基橙的吸附研究[J].化学通报,2018(2):175-181.
[8]Deng L,Shi Z,Peng X,et al.Magnetic calcinated cobalt ferrite/magnesium aluminum hydrotalcite composite for enhanced adsorption of methyl orange[J].Journal of Alloys&Compounds,2016,688:101-112.
[9]张璐虹,唐有根,张丽,等.MgAl-LDH吸附甲基橙性能研究[J].功能材料,2012,43(18):2469-2472.
[10]刘凤仙,邵蒙蒙,夏盛杰,等.ZnCr双金属层状材料对废水中酸性红14的吸附性能[J].无机化学学报,2015,31(7):1342-1350.
[11]顾剑杰,王炎锋,蒋茹,等.Zn/Cr水滑石吸附-可见光催化水中有机污染物[J].工业用水与废水,2014,45(2):9-13.
[12]Ji H,Wu W,Li F,et al.Enhanced adsorption of bromate from aqueous solutions on ordered mesoporous Mg-Al layered double hydroxides(LDHs).[J].Journal of Hazardous Materials,2017,334:212-222.
[13]Kulamani P,Lagnamayee M.Recent progress in the development of carbonate-intercalated Zn/Cr LDH as a novel photocatalyst for hydrogen evolution aimed at the utilization of solar light[J].The Royal Society of Chemistry,2012,41:1173–1178.
[14]李蕾,张春英,矫庆泽,等.Mg-Al-CO3与Zn-Al-CO3水滑石热稳定性差异的研究[J].无机化学学报,2001,17(1):113-118
[15]曹根庭,薛继龙,夏盛杰,等.不同阴离子插层锌铝水滑石对亚甲基蓝的光催化性能[J].硅酸盐学报,2016,44(5):726-732.
[16]任玲玲,李峰,何静,等.镁锌铝三元水滑石的合成与结构分析[J].北京化工大学学报,2002,29(2):77–79.
[17]Xia S J,Liu F X,Ni Z M,et al.Layered double hydroxides as efficient photocatalysts for visible-light degradation of Rhodamine B[J].J Colloid Interface Sci,2013,405:195–200.
[18]夏燕,朱润良,陶奇,等.阴离子表面活性剂改性水滑石吸附硝基苯的特性研究[J].环境科学,2013,34(1):226–230.
[19]王絮,于洪波,刘赛月,等.镁铝水滑石焙烧产物对甲基橙溶液的吸附性能[J].硅酸盐通报,2013,32(10):1984-1988.
[20]王澜,葛圣松,邵谦,等.锌镍铝水滑石微球的制备及吸附性能[J].无机化学学报,2016,32(11):1896-1904.