真空紫外光解-活性炭吸附去除甲苯及副产物臭氧

研究了不同条件下产O3低压汞灯对气相中低浓度甲苯的光化学降解,以及活性炭纤维(ACF)对甲苯光解尾气中残余甲苯及光解副产物O3的脱除.结果表明,气流相对湿度(RH)越高、气体流量越大、甲苯的初始浓度越高,甲苯的真空紫外光解速率越高,最高达0.070mg/m3,所产生的O3浓度也越低.气流RH越低,ACF对甲苯和O3的吸附脱除性能越好.负载Mn、Cu氧化物的ACF对O3有更好的分解性能,同时能催化氧化甲苯.在400℃下焙烧的催化剂性能最好,RH8%时对O3的去除率稳定在35%,但当RH增至40%时,对O3的去除率下降为16.9%.     

染料碱性紫(5BN)排放废渣(酸化渣子)的处理技术

重点介绍了染料工业碱性紫生产过程中排放的（酸化渣子）含CuS废渣回收结晶硫酸铜的原理及工艺流程，经GB437－80分析检测，产品可达工业一级产品标准，并且回收率较高，本工艺与大工业制的CuSO4 5H2O相比，具有设备简单，操作简便，本地资源进行深度加工等特点。     

聚甲基丙烯酸-Fe3O4纳米吸附剂的吸附性能

以共沉淀法制备纳米Fe3O4,通过在颗粒表面接枝聚甲基丙烯酸(PMAA),制备了一种新型磁性纳米吸附剂.用透射电镜(TEM)、X-衍射分析(XRD)等对其进行了表征,并考察了它对酸性玫瑰红B(RB)的吸附性能.结果表明,制备的磁性微球平均粒径18nm.该吸附剂能有效去除RB,吸附速率很快,在5min内基本达到平衡.等温吸附数据符合Langmuir模型,饱和吸附容量为0.2mg/mg,吸附常数为7.2mL/mg.吸附为吸热过程,288～318K时,焓变为18kJ/mol.     

A/O接触氧化法处理城市生活污水的工程实践

介绍了A O工艺 (内置填料 )处理城市生活污水的工程实例。监测数据表明 :该工艺成熟可靠、出水能够达到排放标准 ,是处理城市生活污水较理想的工艺选择     

活性炭吸附法脱除烟气中SO_2的实验研究

本文描述了活性炭脱除烟气中Ｓｉｂ的实验过程．并在实验基础上讨论了Ｏ２／ＳＯ２、Ｈ２Ｏ／ＳＯ２、活性炭床层温度和空速等对脱硫效率的影响，提出了影响脱硫效率参数的合理取值范围．     

南京市居室内SO2、HCHO和TVOCs污染的研究

于2005年夏季(8月)和冬季(12月)在南京市的市区和近郊区各选择了20家具有不同房屋特征的住户,分别对其室内空气中SO2、HCHO和TVOCs的浓度进行了监测研究结果表明,室内SO2、HCHO和TVOCs在温度高、相对湿度高、空气流通量大的夏季,浓度都会超出标准值,这3种物质的浓度在冬季会有所下降装饰和装修材料是室内HCHO和TVOCs的主要来源,同时厨房内的烹调活动对室内TVOCs的浓度也有一定的贡献.市区和近郊区室外空气中SO2的浓度都较高,且I/O值≤1,因此,可推断室外空气中的SO2是室内空气中SO2的主要来源.     

Competitive role of nitrogen functionalities of N doped GO and sensitizing effect of Bi2O3 QDs on TiO2 for water remediation

The promising solar irradiated photocatalyst by pairing of bismuth oxide quantum dots (BQDs) doped TiO₂ with nitrogen doped graphene oxide (NGO) nanocomposite (NGO/BQDs-TiO₂) was fabricated. It was used for degradation of organic pollutants like 2,4-dichlorophenol (2,4-DCP) and stable dyes, i.e. Rhodamine B and Congo Red. X-ray diffraction (XRD) profile of NGO showed reduction in oxygenic functional groups and restoring of graphitic crystal structure. The characteristic diffraction peaks of TiO₂ and its composites showed crystalline anatase TiO₂. Morphological images represent spherical shaped TiO₂ evenly covered with BQDs spread on NGO sheet. The surface linkages of $\text{NO}?\mathrm{O}?\text{Ti}$, $\mathrm{C}?\mathrm{O}?\text{Ti}$, $\mathrm{B}\mathrm{i}?\mathrm{O}?\text{Ti}$ and vibrational modes are observed by Fourier transform infrared spectroscopy (FTIR) and Raman studies. BQDs and NGO modified TiO₂ results into red shifting in visible region as studied in diffused reflectance spectroscopy (DRS). NGO and BQDs in TiO₂ are linked with defect centers which reduced the recombination of free charge carriers by quenching of photoluminescence (PL) intensities. X-ray photoelectron spectroscopy (XPS) shows that no peak related to $\mathrm{C}?\mathrm{O}$ in NGO/BQDs-TiO₂ is observed. This indicated that doping of nitrogen into GO has reduced some oxygen functional groups. Nitrogen functionalities in NGO and photosensitizing effect of BQDs in ternary composite have improved photocatalytic activity against organic pollutants. Intermediate byproducts during photo degradation process of 2,4-DCP were studied through high performance liquid chromatography (HPLC). Study of radical scavengers indicated that ${\mathrm{O}}_2^{·?}$ has significant role for degradation of 2,4-DCP. Our investigations propose that fabricated nanohybrid architecture has potential for degradation of environmental pollutions.     

Simulation of temporal and spatial change of N2O emissions in the Yangtze River Delta

A biogeochemical model(DNDC) is combined with a plant ecological model to estimate N2O emission from rice paddy fields in the Yangtze River Delta region. The model is driven by local meteorological, soil, and physiological data and is validated for 1999 and 2000 at a site in the region, which showed that the simulated N2O emissions agree fairly well with the observed data. This adds some confidence in the estimated N2O emissions during 1950 and 2000 in the Hangzhou Region. A significant correlation between the N2O emissions and the population for the Hangzhou Region is found, which is due to a combination of increased application of fertilizers and cultivated area.Such a correlation can not be established for the whole Yangtze River Delta region when the data of both urban and rural are as areincluded. However, when the data from the heavily urbanized areas are excluded, a significant correlation between population and N2O emissions emerges. The results show clearly that both the temporal and the spatial N2O emissions have significant positive relationship with population under traditional farming practice. These results have implications for suitable mitigation options towards a sustainable agriculture and environment in this region.     

长白山阔叶红松林空气N_2O浓度的垂直分布特征

在原始阔叶红松林测定空气N2 O的垂直分布 ,三次观测结果发现林冠高度处N2 O浓度比树干和林冠上方的背景值高 5 4 3% -74 % ,差异极显著。林冠外出现高浓度 ,树干处低浓度 ,表明N2 O是从林冠排放到周围空气中的。因此 ,本研究提供了植物在自然状态下能排放N2 O的证据 ,从而证明了森林生态系统中植物本身也是大气N2 O的排放源。     

大气N_2O的稳定氮同位素质量平衡探讨

地表释放源释放的N2 O均比对流层大气N2 O贫15N ,对流层N2 O的氮同位素质量由平流层回流的富15N的N2 O来平衡 ,若全球N2 O源汇质量估算结果是平衡的 ,则地表释放源对对流层N2 O的氮同位素质量的贡献量应与平流层回流的贡献量相等。本文根据全球N2 O释放源最近的年释放量估算值 ,在考虑土壤N2 O生成过程中的氮同位素分馏效应后 ,推论出全球N2 O释放源最近的年释放量估算值能使对流层大气N2 O稳定氮同位素质量接近于平衡。