纳米TiO2光催化脱色效果的影响研究

采用偶联剂法制备负载型纳米TiO2光催化剂，对染料废水进行脱色试验研究。结果发现，将废水pH值控制在10～11，通过曝气、添加H2O2、Fe^3 等措施能有效提高废水脱色效果，脱色率在95％以上。     

PBNA及其同分异构体PANA在小鼠ICR系中致癌性的比较研究

对幼ICR雄性小鼠多次皮下注射PANA或它的同分异构体PANA的二甲基亚砜溶液,总剂量432mg,实验周期在10个月左右时均能引起显著高于对照组动物的恶性肿瘤.PANA诱发小鼠肿瘤可能存在剂量——反应关系.PBNA和PANA诱发肿瘤率相似,均以肺癌为主,但明显有不同的亲器官性.实验结果提示二者的致癌机理可能不是由于形成相应的萘胺所致.PANA对动物有致癌性,在国内外尚未见有报道.     

下古生界海相碳酸盐烃源岩地球化学的研究现状

本文对国内外下古生界海相碳酸盐岩研究的四个主要方面作了总结：（1）有机质丰度及其影响因素；（2）有机质赋存形式；（3）下古生界海相碳酸盐岩有机质丰度和生烃潜力恢复方法和原理；（4）下古生界海相碳酸盐岩热成熟度研究。这四个方面是评价我国下古生界海相碳酸盐岩勘探前景至关重要的因素，也是近年来我们研究下古生界海相碳酸盐岩的热点和难点问题。     

超临界二氧化碳流体萃取土壤中有机污染物的研究进展

就近年来人们利用超临界二氧化碳流体对有机污染物污染的土壤所做的研究工作以及所取得的成果进行了总结。     

深度平均的应力-通量代数全场模型及其验证

提出了深度平均的应力—通量代数全场模型，用来模拟热水侧向排入大水体的各向异性的输移扩散规律。应用有限体积法对控制方程进行离散，利用ＳＩＭＰＬＥ法进行数值模拟。通过该模式的模拟计算给出了速度场、温度场的分布。所得的回流区形状及温度场分布与深度平均的ｋ－ε模型及实验资料对比，本文的计算结果与实测值符合得较好     

LPG降低城市废气的环保能源

为了缓解火气污染，广州市交委于2003年赵在广州市公交、出租行业全面推广使用LPG燃料。在两年多的推广应用过程中，LPG车辆在广州市公交、出租行业中已得到成功的应用。LPG作为环保能源，它的环保功能体现在哪些方而？让我们一起了解。     

In situ preparation of g-C3N4/Bi4O5I2 complex and its elevated photoactivity in Methyl Orange degradation under visible light

A graphite carbon nitride(g-C_3N_4) modified Bi_4O_5I_2 composite was successfully prepared insitu via the thermal treatment of a g-C_3N_4/Bi OI precursor at 400°C for 3 hr.The as-prepared g-C_3N_4/Bi_4O_5I_2 showed high photocatalytic performance in Methyl Orange(MO) degradation under visible light.The best sample presented a degradation rate of 0.164 min~(-1),which is 3.2 and 82 times as high as that of Bi_4O_5I_2 and g-C_3N_4,respectively.The g-C_3N_4/Bi_4O_5I_2 was characterized by X-ray powder diffractometer(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Raman,X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectra(DRS),electrochemical impedance spectroscopy(EIS) and transient photocurrent response in order to explain the enhanced photoactivity.Results indicated that the decoration with a small amount of g-C_3N_4 influenced the specific surface area only slightly.Nevertheless,the capability for absorbing visible light was improved measurably,which was beneficial to the MO degradation.On top of that,a strong interaction between g-C_3N_4 and Bi_4O_5I_2 was detected.This interplay promoted the formation of a favorable heterojunction structure and thereby enhanced the charge separation.Thus,the g-C_3N_4/Bi_4O_5I_2 composite presented greater charge separation efficiency and much better photocatalytic performance than Bi_4O_5I_2.Additionally,g-C_3N_4/Bi_4O_5I_2 also presented high stability.·O_2~-and holes were verified to be the main reactive species.     

农业生态环境中的锰元素

论述了锰元素的地球化学特征和分布，农作物与锰元素的关系以及锰元素有效态含量的制约因素：土壤的含量、土壤的酸碱度、土壤的氧化还原环境、土壤的有机质含量。     

印染废水处理技术现状及其进展

印染废水是一种水质水量变化大、有机物含量高，可生化性差，COD高，色度高的难降解废水。系统地介绍了印染废水处理的应用现状及技术进展，对处理印染废水的化学法、物理法以及生物处理技术进行了综述。     

First-trimester prenatal diagnosis of severe alpha-thalassemia

By means of chorion biopsy together with restriction endonuclease analysis of fetal DNA, first trimester diagnoses were successfully made in 33 fetuses at risk for Bart's hydrops fetalis. Seven pregnancies with Hb H or hydrops fetalis were therapeutically terminated before 4 months of gestation. Of the 26 pregnancies intended to continue, 18 have come to term with normal deliveries; one with threatened abortion was terminated at the end of the first trimester and, seven are progresssing normally.