化学发光材料双(2,4,6-三氯苯基)草酸酯的合成

草酸酯是过氧草酸酯类化学发光所必需的一种要素化合物，作者合成了一种能提供高强度化学发光的草酸酯即双（２，４，６ 三氯苯基）草酸酯，并以质谱验证了结构。     

气相色谱-质谱法测定水产品中的10种含氯苯酚及其盐类的含量

目的建立气相色谱-质谱法检测水产品中10种含氯苯酚的含量。方法样品采用1mol/L氢氧化钾溶液超声提取,经乙酸酐衍生,用正己烷提取后采用气相色谱-质谱法(gas chromatography-mass spectrometry,GC-MS)进行检测,以外标法定量。结果 10种含氯苯酚在2.0~50.0μg/L浓度范围内具有良好的线性关系,相关系数r大于0.999,方法定量限为2.5μg/kg。空白基质加标回收实验添加浓度分别为2.5、12.5和62.5μg/kg时,水产品中10种含氯苯酚的回收率在85.1%~104.5%之间,相对标准偏差≤5.0%。结论该方法灵敏度、精密度和定量限均符合实际样品检测要求,可用于水产品中含氯苯酚及其盐类的日常监测。     

Study on cross-linking agent of a novel one-component API adhesive

The high reactivity and toxicity of isocyanates do not allow their storage and use in one-component system aqueous polymer isocyanate adhesives. Blocked isocyanates are a solution to protect the isocyanate groups by blocking with suitable blocking agent. In order to obtain eco-friendly systems and eliminate the effect of the organic solvents on environment, the blocked isocyanates can be dispersed in water by using external emulsifier by incorporating hydrophilic groups into the backbone. In this work, a series of waterborne blocked polyisocyanate dispersions were prepared by anionic modified process, using polyaryl polyisocyanate (PAPI), 2,4,6-trichlorophenol (TCP), and dimethylol propionic acid. Particle sizes were measured and compared by laser particle sizer and scanning electron microscopy. The structures of aqueous dispersions were characterized by FTIR, ¹H NMR, and ¹³C NMR, and results confirmed that the –NCO groups are effectively blocked by –OH groups. Thermal property was investigated using differential scanning calorimetry; then, kinetic parameters, ΔE, and n were deduced. It was found that the deblocking temperature of aqueous dispersion is about 55?°C. Hydrophilicity was characterized by measuring the water contact angles. The experimental results showed that the contact angle of solvent-borne solution is 68.6°, while that of aqueous dispersion is only 25.2°, which indicated that the hydrophilicity of waterborne TCP-blocked PAPI increases for the introduced hydrophilic group compared with solvent-borne TCP-blocked PAPI. The compressive shear strength was tested to evaluate wood bonding performance of the adhesive.     

改性活性炭对2,4,6-三氯酚的吸附

比较研究了5种活性炭(GAC0、GACH、GACF、GACF1M1、GACF1M3)对2,4,6-三氯酚(2,4,6-TCP)的去除效果,发现GACF1M3有最佳的TCP吸附能力;5种活性炭对TCP的吸附容量分别为160、178、207、194和238 mg/g。着重研究了GACF1M3对TCP的吸附过程。随着TCP初始浓度的增加,TCP的吸附量也相应增加;温度的改变,会影响TCP的去除率,温度从30 ℃增加到45 ℃时,相同条件下的TCP的去除率稍有下降;活性炭的投加量对TCP的去除也有较明显的影响,投加量从10 mg到500 mg,TCP的去除效果明显增强。微酸性的pH值,有利于GACF1M3吸附TCP。在反应动力学的研究中,拟二级反应动力学能较好的模拟反应过程。通过扫描电镜及X射线衍射实验,观察GACF1M3的表面形貌并确定表面负载金属化合物的主要成分为Fe3O4、Mn3O4、FeOxMnO(1-x)。     

漆酶去除蓝湿革中三氯苯酚的研究

研究了漆酶去除蓝湿革中三氯苯酚(Tr CP)的可行性。采用常规的制革工艺,考察了温度、pH、酶用量、作用时间等条件下漆酶去除蓝湿革中Tr CP的效果。结果表明,在pH=4.5、温度45℃、漆酶(268)用量0.1%,转动1h,蓝湿革中Tr CP的去除率可达到90%以上,相同条件下未加入漆酶的对比实验中,Tr CP去除率约70%。实验结果显示出漆酶在深度去除蓝湿革中的Tr CP方面具有一定的效果。     

PAC Addition for MBR Start up in Micro-polluted Water Treatment

In order to improve membrane reactor ( MBR ) performance for micro?polluted surface water treatment in start?up phase, removals of nitrogen and organic matters especially synthetic organic matters by M...     

(壳聚糖/γ-Fe_2O_3)@C磁性复合材料表面印迹聚合物选择性吸附2,4,5-TCP的研究

本文采用乳液聚合法合成碳基磁性碳球(壳聚糖/γ-Fe2O3)@C,并在其表面上引入乙烯基,以2,4,5-三氯酚(2,4,5-TCP)为模板分子、甲基丙烯酸(MAA)为功能单体、乙二醇二甲基丙烯酸酯(EGDMA)为交联剂制备磁性碳球表面印迹聚合物。并利用扫描电子显微镜、紫外分光光度计、振动样品磁强计和热重分析仪等表征手段对其形貌、结构等物理化学性能进行表征,研究其热稳定性和磁稳定性,考察其作为吸附剂对2,4,5-三氯酚的吸附性能及选择性能。研究结果表明,磁性碳球和磁性碳球表面印迹聚合物(MMIPs)的饱和磁强度分别为4.3 emu/g和1.7 emu/g。吸附平衡数据表明其符合Freundlich吸附等温模型,平衡吸附量大约为200mg/g,吸附符合准二级动力学方程,平衡吸附时间大约为10 min,印迹吸附剂对模板分子吸附量最佳,且存在明显特异性吸附。     

Dual solute adsorption of 2,4,6‐trichlorophenol and N‐[2‐(2,4,6‐trichlorophenoxy)propyl]amine on to activated carbon

The capacities of four activated carbon types to adsorb both 2,4,6‐trichlorophenol (TCP) and N‐[2‐(2,4,6‐trichlorophenoxy)propyl]amine (BTS40348), as single‐ and dual‐solutes, at pH 4, 7 and 9, were evaluated by use of the Freundlich isotherm model. Coal‐based activated carbon type F400 was found to most strongly adsorb both compounds, with adsorption optima at pH 4 and 9 for TCP and BTS40348, respectively. In dual‐solute isotherms, the adsorptive capacity for each solute was reduced with pH, dictating which solute was most strongly adsorbed. Compared with these batch isotherms, F400 adsorptive capacity was reduced in flow‐through column studies. Activated carbon bioregeneration was studied but the adsorptive capacity of the flow‐through column did not increase, indicating that biologically‐mediated desorption of solute did not occur. © 2001 Society of Chemical Industry