SB粉水热种分过饱和铝酸钠溶液制备拟薄水铝石

A novel hydrothermal process for preparation of single-phase pseudoboehmite from supersaturated sodium aluminate solution with SB pseudoboehmite seed was presented. The process is characterized by precipitation for 3 h at temperature around 125 ℃ with a seed ratio of 1.0. Precipitation yield of Al₂O₃ over 20% could be reached and the specific surface area of precipitated products almost as high as SB seed could be obtained. The process suitable for preparing pseudoboehmite with any pseudoboehmite seed in principle comprises a highly variation of the current Bayer process and the latest boehmite process for the production of smelter grade alumina.     

原位聚合阴离子交换型固相萃取（SPE）微柱

原位聚合阴离子交换型固相萃取（SPE）微柱;原位聚合;SPE微柱;分离富集     

水杨醛缩天冬酰胺Schiff碱稀土配合物的合成与抗·O-2生物活性

合成了水杨醛缩天冬酰胺的系列稀土配合物, 通过熔点测定、元素分析、摩尔电导率、磁化率、 TG-DTA、 UV、 IR、 1H-NMR、 EPR谱等对配体及配合物的组成进行了表征, 得到配合物的可能组成为RE3(AS)2(NO3)5·3C2H5OH·H2O. 磁化率数据表明配合物为三中心结构, 摩尔电导率数据表明配合物为1∶2型电解质, 即2个NO3-在外界, 3个NO3-在内界. TG-DTA, IR, 1H-NMR等分析表明水分子参与配位, CO2-, NO3-均以双齿配位, Nd3+的顺磁位移效应使与之相邻质子的1H-NMR位移值增大. 抗超氧阴离子自由基(·O-2)实验表明, 配合物具有显著的抗·O-2生物活性.     

INFLUENCES OF ACID POST-TREATMENT ON THE MORPHOLOGY OF SOAPFREE P（MMA-EA-MAA） PARTICLES PREPARED BY SEEDED EMULSION POLYMERIZATION

Soap-free poly（methyl methacrylate-ethyl acrylate-methacrylic acid） latex particles with narrow size distribution were synthesized by seeded emulsion polymerization, and the porous particles were created by a stepwise alkali/acid treatment method. Effects of acid treatment conditions on the particle morphology were investigated. Results show that one to three pores were formed inside most of particles after post-treatment. At pH 7.0, when the treatment temperature was lower than 70℃, the size of particles and the volume of pores remained almost unchanged, and these two values increased significantly when the temperature was higher than 70℃. Both the particle size and the pore volume decreased with the increase of initial pH value and treatment time in the acid treatment. As the pH was below 4.0 and the treatment time was longer than 180 min, the particles shrunk in size.     

Fe(Ⅲ)与2,3-二羟基苯磺酸钠配位反应的动力学研究

[H+]在0.01～0.70 mol·L-1范围内,离子强度为1.00 mol·L-1,[Fe(Ⅲ)]＞＞[配体]、[H+]＞＞[配体]的条件下,研究了Fe(Ⅲ)与2,3-二羟基苯磺酸钠(Tiron)的配位反应.发现当[H+]≤3.00×10-2 mol·L-1时,[Fe(Ⅲ)]2对反应速率有明显的贡献.求得了相关反应的动力学参数,从而揭示了FeOH2+和FeOH24+与Tiron配位的解离反应途径及FeOH23+的缔合反应机制,并提出了该配位反应的可能机理.     

A New Hydroxo‐bridged Chromium(III) Dimer [Cr(saltn)OH]2·4H2O: Synthesis,Crystal Structure and Magnetic Properties

A new hydroxo‐bridged dimeric Cr(III) complex [Cr(saltn)OH]₂·4H₂O [H₂saltn=N,N′‐bis(salicylidene)trimethylenediamine] has been synthesized and its structural and magnetic properties have been investigated. The complex crystallizes in the triclinic space group P‐1 with one dimeric formula unit in a cell of dimensions a=0.95828(19) nm, b=0.95926(19) nm, c=1.0437(2) nm, α=86.77(3)°, β=82.48(3)°, and γ=64.93(3)°. The geometry around each chromium(III) center is six‐coordinate, distorted‐octahedral. The bridging Cr₂O₂ unit is strictly planar, as required by the crystallographic symmetry. The Cr? O? Cr′ bridging angle is 99.94(16)°, and the distance between Cr…Cr′ is 0.3019 nm. The magnetic susceptibility of the complex has been examined in the range of 2‐300 K. By using the spin‐spin coupled model for an S₁=S₂=3/2 dimeric system , the magnetic data were fitted to give the parameters of g=2.01(1), J=‐0.85(2) cm^‐1, and zJ' =0.18(3)cm^‐1, indicating the presence of a weak antiferromagnetic spin‐exchange interaction between the Cr(III) ions in the binuclear complex.     

重组质粒对大肠杆菌HB101生长影响的微量热研究

用微量热方法研究了嗜麦芽假单胞菌AT18, 受体菌大肠杆菌HB101, mel基因工程菌——大肠杆菌HB101/pWSY8和携带克隆载体pUC18质粒的大肠杆菌HB101等的生长代谢过程. 实验结果从热化学和热动力学上阐明了细菌的生长速率常数与其所含质粒的大小呈负相关. 探讨了低温处理对含不同质粒大肠杆菌生长的影响, 发现低温处理对工程菌生长影响最大.     

生物修复技术在重金属污染治理中的应用

随着工业的发展，重金属对环境的污染越来越引起人们的关注。生物修复技术以其投资少、效率高、可以原位修复低浓度有害污染物的特性而在环境污染治理中发挥了巨大的作用，自上世纪80年代产生以来，得到了越来越广泛的应用。本文简要介绍了几种生物修复技术在污染治理中的应用，以期进一步推动重金属污染的治理和修复工作。     

壳聚糖接枝丙烯酸制备高强吸水材料

甲壳素（Chitin）年产量约为10-100亿吨,是仅次于纤维素（约为100亿吨）的第二大天然资源。开发利用这一自然资源宝库,具有十分重要的意义。甲壳素的脱乙酰化产物称为壳聚糖（Chitosan）。本工作对壳聚糖进行丙烯酸接枝改性,制得对蒸馏水吸水率大于800倍、吸自来水大于500倍,吸0．9％NaCl溶液吸液率130倍的吸液保液材料,该材料具有生物降解性,无环境污染,且制备工艺简单,成本低。     

辉光放电光谱法分析掺杂纳米硅薄膜的研究

介绍了利用辉光放电光谱法分析掺杂纳米硅薄膜,通过优化辉光光源激发参数、计算标准样品的溅射率,建立了掺杂纳米硅薄膜的定量表面分析方法。方法应用于实际掺杂纳米硅薄膜样品的分析,并将分析深度、剖析结果与表面形貌仪的结果进行了对照。试验结果表明,分析方法快速、准确,具有实际应用价值。