改性活性炭用于湿法磷酸脱色的研究

简介了湿法磷酸脱色的现状,开展了活性炭改性及其对染料吸附性能的研究,探讨了活性炭类型、活性炭用量、温度、时间和搅拌速率等因素对湿法磷酸脱色工艺的影响.实验结果表明,采用工业级粉末活性炭(平均粒径0.15 mm)、活性炭用量7.5 g/100 mL、脱色温度55 ℃、脱色时间30 min、搅拌速度300 r/min,磷酸...     

双甘膦生产废水中亚磷酸含量的测定

生产双甘膦的废水中含有亚磷酸,亚磷酸具有还原性,在酸性介质中及加热条件下,高锰酸钾能将亚磷酸氧化成磷酸,加入过量的硫酸亚铁铵将过量的高锰酸钾还原,过量的硫酸亚铁铵用高锰酸钾标准溶液滴定.此方法测定亚磷酸的含量,相对标准偏差为0.44％,加标回收率在97.70％～100.19％之间,测定结果比较满意.     

水滑石/红磷协同阻燃EVA材料的热分解特性

采用熔融共混方法制备了EVA/水滑石(LDH)/微胶囊化红磷(MRP)无卤阻燃材料,研究了LDH和MRP在乙烯与醋酸乙烯共聚物(EVA)中的阻燃协同作用,发现在EVA/LDH阻燃体系中添加适量的MRP可以显著提高体系阻燃性能,而且燃烧过程中不再有熔滴现象发生。采用TG和实时傅立叶变换红外光谱(RT-FT-IR)研究了EVA及其复合阻燃材料的热分解特性,实验发现,与EVA/LDH体系相比,EVA/LDH//MRP体系的热稳定性有所提高,MRP对EVA/LDH体系中的EVA热氧化降解具有一定的抑制作用。     

DOPO与环氧树脂反应特性的研究

通过环氧值滴定和红外光谱研究了9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)与环氧树脂E-20的反应特性,用红外谱图确认了DOPO与E-20进行反应的程度以及DOPO含磷阻燃环氧树脂的初步结构。采用DTA分析方法研究DOPO与E-20的反应动力学,测得DOPO与E-20反应的动力学参数lnA0为20.88,表观活化能E为96.42kJ/mol,反应级数n为0.74。实验结果表明,在120℃下添加15%催化剂,反应90min可获得最佳阻燃效果。     

Denitrifying phosphorous removal in anaerobic/anoxic SBR system with different startup operation mode

To achieve stable and efficient nitrogen and phosphorus removal and to investigate the characteristics of the A/A SBR enriched with denitrifying phosphorus removal bacteria(DPB),the whole course of startup was studied with two reactors operated in different mode.The reactor I was operated under anaerobic/settling/anoxic/settling mode,and the reactor II was operated under anaerobic/anoxic/settling mode.Differences between the two reactors in removal efficiency of COD,nitrogen and phosphorus were examined.The results indicated that efficient performance could be achieved in both reactors with different startup operation mode,while the phosphorus removal efficiency was improved sooner in reactor I than in reactor II,which suggested that reactor I would supply a more favorable condition for DPB proliferation.Meanwhile,it was observed that the amount of organic substrates consumption had a linear correlation to that of phosphorus release in anaerobic phase when DPB was accumulated in the A/A SBR denitrifying phosphorus removal system.     

用气相色谱法对水中有机磷农药的测定

本文采用固相萃取法预处理,然后用带有火焰光度检测器(FPD)的气相色谱仪测定有机磷农药。结果表明,该法具有简单、快速、准确的持点。     

水质阻垢剂DPP的合成及性能评价

由甲醛、亚磷酸和多乙烯多胺为原料合成的有机膦型水质阻垢剂 DPP,具有用量少、效率高、有效时间长的特点 ,其阻垢作用优于常见阻垢剂 ,为油田水质阻垢 ,提供了一种新型水质阻垢剂     

偶氮苯二甲酰氯的合成和表征

以偶氮苯二羧酸和五氯化磷为原料,二氯乙烷为溶剂,三乙胺为酸吸收剂,合成了4种偶氮苯二甲酰氯,产率为75.3～93.6%。用红外光谱、核磁共振谱及元素分析进行了表征。     

酸性电镀铜用磷铜阳极探讨

介绍了评价磷铜阳极质量的几个关键因素,即原材料纯度、晶粒结构、磷含量和表面清洁,以及它们对电镀产品质量的影响。     

Optical Basicity of Titanium(IV) Oxide

The relationship between phosphate and vanadate capacites and optical basicity, Λ, are used in order to settle the optical basicity of TiO₂. Phosphate and vanadate capacity data indicate that the optical basicity of TiO₂ is 0.55. The validity of this value is supported by the good agreement with the value derived from Pauling electronegativity.