改性硅胶对金属盐阳、阴离子的同时吸附及抗菌性能的研究

发布时间：2018-05-11 02:06

本文选题：硅胶 + 席夫碱　；参考：《武汉纺织大学》2017年硕士论文

【摘要】：本文以硅胶为基质,通过对其进行氨基修饰并与5-溴水杨醛及其衍生物反应得到负载席夫碱配体的改性硅胶吸附剂SG-H2L1、SG-H2L2和SG-H2L3,并用其吸附模拟废水中的金属离子和阴离子。通过FT-IR、SEM、BET、EPR、TGA等进行了表征分析,研究了三种吸附剂对金属盐溶液中阳离子和阴离子的吸附行为。金属阳离子和阴离子的吸附量分别由电感耦合等离子发生光谱仪(ICP)和离子色谱仪(ICS)测定。通过pH值、温度、不同的阳离子和阴离子竞争吸附等因素来探究吸附剂对金属离子和阴离子的吸附性能。对于改性硅胶的抑菌研究,本文制备了三种硅胶负载季铵盐的抗菌剂SG-QA8、SG-QA12和SG-QA16。采用FT-IR、EA、TGA、XPS等对改性硅胶抗菌剂进行了分析表征。SG-QA8、SG-QA112和SG-QA16对大肠杆菌和金黄色葡萄球菌的抗菌实验采用平板计数法进行研究。上述研究得出以下结论:(1)SG-H2L3对金属离子和阴离子的吸附量大于SG-H2L1、SG-H2L2,说明SG-H2L3对金属离子和阴离子的吸附具有协同作用;当Cu2+、Ni2+、Mn2+、Co2+和Cd2+这五种金属阳离子同时存在时,吸附剂SG-H2LI、SG-H2L2、SG-H2L3及其前驱体SG-NH-NH2均只对Cu2+有吸附;当SO42-、Cl-和NO3-三种阴离子同时存在下,吸附剂SG-H2L1、SG-H2L2、SG-H2L3 及其前驱体 SG-NH-NH2 均只对 SO42-和 NO3-有吸附能力,并且吸附能力为SO42-NO3-;SG-H2L3对Cu2+和SO42-的吸附的吸附行为符合Langmuir等温方程和准二级动力学模型,最大吸附量分别为54.14mg/g和75.13mg/g;热力学结果表明,SG-H2L3对Cu2+和SO42-的吸附过程是一个自发的吸热过程。(2)经过氨基修饰的硅胶SG-(NH)2-NH2对大肠杆菌和葡萄球菌均无抗菌性;SG-QA8、SG-QA12、SG-QA16三种抗菌剂对葡萄球菌的抗菌性均强于大肠杆菌;三种抗菌剂对大肠杆菌和葡萄球菌抗菌性强弱顺序为SG-QA16SG-QA12SG-QA8;当加入0.4mL(1×108CFU/mL)大肠杆菌时,SG-QA8、SG-QA12、SG-QA16的最低抑菌浓度分别为 20mg/mL、16mg/mL、12mg/mL;当加入 0.5mL(8.5×108CFU/mL)金黄色葡萄球菌时,SG-QA8、SG-QA12、SG-QA16的最低抑菌浓度分别为 2.4mg/mL、1 mg/mL、0.8 mg/mL。
[Abstract]:In this paper, modified silica gel adsorbents SG-H2L1, SG-H2L2L2 and SG-H2L3 were prepared by amino modification of silica gel and reaction with 5-bromosalicylaldehyde and its derivatives. The adsorbents SG-H2L1- SG-H2L2 and SG-H2L3 were used to adsorb metal ions and anions in simulated wastewater. The adsorption of cations and anions in metal salt solution by three adsorbents was studied. The adsorption amounts of metal cations and anions were measured by inductively coupled plasma generation spectrometer (ICP) and ion chromatograph (ICS), respectively. The adsorption properties of metal ions and anions were investigated by pH value, temperature, competition adsorption of cations and anions. In this paper, three antimicrobial agents, SG-QA8, SG-QA12 and SG-QA16, which are loaded with quaternary ammonium salts, were prepared for the bacteriostasis of modified silica gel. Modified silica gel antimicrobial agents were analyzed and characterized by FT-IR TGAGA-XPS. The antibacterial activities of SG-QA8 SG-QA112 and SG-QA16 against Escherichia coli and Staphylococcus aureus were studied by plate counting method. The results show that the adsorption capacity of SG-H2L3 to metal ions and anions is higher than that of SG-H2L1SG-H2L2, which indicates that SG-H2L3 has synergistic effect on the adsorption of metal ions and anions. The adsorbent SG-H2L2L2SG-H2L3 and its precursor SG-NH-NH2 only adsorbed Cu2, and the adsorbents SG-H2L1, SG-H2L2L2SG-H2L3 and their precursor SG-NH-NH2 only adsorbed so _ 42- and no _ 3- in the presence of so _ 42-Cl _ (-) and no _ (3-) at the same time, the adsorbent SG-H2L1 / SG-H2L2SG-H2L3 and its precursor SG-NH-NH2 only adsorbed so _ 42- and no _ 3- in the presence of so _ 42-O _ 3- and no _ 3-. The adsorption capacity of so _ 42-NO _ 3-O _ G-H _ 2L _ 3 for Cu2 and so _ 42- was in accordance with the Langmuir isothermal equation and the quasi-second-order kinetic model. The maximum adsorption capacity was 54.14mg/g and 75.13 mg / g, respectively; the thermodynamic results showed that the adsorption of Cu2 and so _ 42- by SG-H _ 2L _ 3 was a spontaneous endothermic process.) the amino modified silica gel SG-(NH)2-NH2 had no antimicrobial activity against Escherichia coli and Staphylococcus, and SG-QA8, SG-QA12SG-QA16 had no antimicrobial effect on Escherichia coli and Staphylococcus. The antibacterial activity of Staphylococcus was stronger than that of Escherichia coli. The antimicrobial activity of three antimicrobial agents against Escherichia coli and Staphylococcus was in the order of SG-QA16SG-QA12SG-QA8; when 0.4mL(1 脳 108CFU / mL was added, the minimum inhibitory concentration of SG-QA8SG-QA12SG-QA16 was 20mg / mL16mg / mL-1, respectively; when 0.5mL(8.5 脳 108CFU / mL was added, the minimum inhibitory concentration of SG-QA8SG-QA12SG-QA16 was 2.4 mgmL1 mg / mL0.
【学位授予单位】：武汉纺织大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O647.3

【参考文献】