2005~2018年河南省NO2柱浓度变化特征

运用OMI卫星遥感资料对河南省2005~2018年NO₂柱浓度的时空分布进行分析,并结合国家大气污染防治政策的实施,研究了2013年之后河南省NO₂柱浓度的变化特征.结果表明,河南省NO₂柱浓度的空间分布为东北高、西南低,高值和低值中心分别位于安阳-新乡-焦作一带（>18.0×10¹⁵molec/cm²）和洛阳-三门峡-南阳市交界（4.0~8.0）×10¹⁵molec/cm².从季节变化来看,冬季NO₂柱浓度高于春夏季,冬季高值中心的浓度较春夏高50%~70%.在2011年前,河南省NO₂柱浓度不断上升,北部较南部增速快.2011年后全省NO₂柱浓度明显下降,焦作-新乡-安阳一带下降最快,主要污染物总量减排和大气污染防治行动计划的实施有效促进了浓度的下降.《大气污染防治行动计划》实施后,与位于京津冀大气污染传输通道的城市相比,传输通道外的城市NO₂柱浓度下降速度慢甚至略有增长,应进一步加大其大气污染防治力度.     

Superior activity of iron–manganese supported on kaolin for NO abatement at low temperature

A series of Fe–Mn catalysts was prepared using different supports(kaolin, diatomite, and alumina) and used for NO abatement via low-temperature NH_3-selective catalytic reduction(SCR).The results showed that 12 Fe–10 Mn/Kaolin(with the concentration of Fe and Mn 12 and 10 wt.%, respectively) exhibited the highest activity, and more than 95.8% NO conversion could be obtained within the wide temperature range of 120–300℃.The properties of the catalysts were characterized by inductively coupled plasma-atomic emission spectrometry(ICP-AES), thermogravimetry(TG), Brunner–Emmet–Teller(BET)measurements, X-ray diffraction(XRD), H_2-temperature programmed reduction(H_2-TPR),NH_3-temperature programmed desorption(NH_3-TPD), X-ray photoelectron spectroscopy(XPS), scanning electron microprobe(SEM) and energy dispersive spectroscopy(EDS)techniques.The support effects resulted in significant differences in the components and structures of catalysts.The 12 Fe–10 Mn/Kaolin catalyst exhibited better dispersion of active species, optimum low-temperature reduction behavior, the largest amount of normalized Br?nsted acid sites, and the highest Mn~(4+)/Mn and Fe~(3+)/(Fe~(3+)+ Fe~(2+)), all of which may be major reasons for its superior catalytic activity.     

TEA滤膜挂片测定NO2用于山东省城市空气监测优化布点的研究

采用TEA滤膜挂片测定空气中NO2相对浓度的无动力采样方法，实验结果表明：TEA挂片可以反映环境空气中NO2的浓度水平，精密度较好，无需仪器、设备投入，应用于山东省15城市环境空气监测优化布点的网格实测，效果理想。     

干法与半干法烟气脱硫技术综述

介绍了几种干法、半干法烟气脱硫技术，对各种工艺进行了分析，认为干法、半干法烟气脱硫技术的应用将对我国控制SO2排放具有深远意义。     

La_xSr_(1-x)NiO_3对水溶液染料的光电催化活性研究

用甘氨酸 硝酸盐燃烧合成法 ,制备LaxSr1 -xNiO3复合氧化物的陶瓷粉末。并以此为光电催化剂对不同水溶液染料进行光催化降解和光电催化降解实验。利用红外、紫外 可见光谱、循环伏安曲线研究LaxSr1 -xNiO3的催化性能。结果表明 :LaxSr1 -xNiO3(x =0 .1 5、0 .6、0 .7、0 .75、1 )复合氧化物都具有较强光催化特性 ,La0 .7Sr0 .3NiO3也具有光电催化降解特性 ;LaxSr1 -xNiO3的光催化活性高于LaNiO3,这与A位离子 (La3+ 、Sr2 + )的电子构型有关 ;Sr2 + 的加入可使LaNiO3的光催化活性有所提高     

上海市环境空气NO2浓度时空分布特征

为监测机动车尾气造成的氧化型光化学烟雾的污染，采用被动扩散管的监测方法在上海布设65个监测点位，经13个月的连续监测，得出了上海市环境空气中NO2浓度时空分布特征及污染的重点区域，NO2时空分布主要特征：NO2高浓度值出现在交通主干道上（高架出口、隧道口、车辆堵塞的交通要道）；NO2浓度空间分布呈市中心区→市郊区→外围农村区逐渐减弱的趋势；总体时序分布呈秋冬季高于春夏季的变化趋势。     

Peroxymonosulfate activation by Fe-N-S co-doped tremella-like carbocatalyst for degradation of bisphenol A: Synergistic effect of pyridine N, Fe-Nx, thiophene S

Bisphenol A (BPA) has received increasing attention due to its long-term industrial application and persistence in environmental pollution. Iron-based carbon catalyst activation of peroxymonosulfate (PMS) shows a good prospect for effective elimination of recalcitrant contaminants in water. Herein, considering the problem about the leaching of iron ions and the optimization of heteroatoms doping, the iron, nitrogen and sulfur co-doped tremella-like carbon catalyst (Fe-NS@C) was rationally designed using very little iron, S-C₃N₄ and low-cost chitosan (CS) via the impregnation-calcination method. The as-prepared Fe-NS@C exhibited excellent performance for complete removal of BPA (20 mg/L) by activating PMS with the high kinetic constant (1.492 min⁻¹) in 15 min. Besides, the Fe-NS@C/PMS system not only possessed wide pH adaptation and high resistance to environmental interference, but also maintained an excellent degradation efficiency on different pollutants. Impressively, increased S-C₃N₄ doping amount modulated the contents of different N species in Fe-NS@C, and the catalytic activity of Fe-NS@C-1-x was visibly enhanced with increasing S-C₃N₄ contents, verifying pyridine N and Fe-N_x as main active sites in the system. Meanwhile, thiophene sulfur (C-S-C) as active sites played an auxiliary role. Furthermore, quenching experiment, EPR analysis and electrochemical test proved that surface-bound radicals (^·OH and SO₄^⋅−) and non-radical pathways worked in the BPA degradation (the former played a dominant role). Finally, possible BPA degradation route were proposed. This work provided a promising way to synthesize the novel Fe, N and S co-doping carbon catalyst for degrading organic pollutants with low metal leaching and high catalytic ability.     

Production and Consumption of NO in Forest and Pasture Soils from the Amazon Basin

NO production and the rate constant of NO consumptionin soil samples from Amazonian forest and pasturesites were determined in the laboratory. The purposewas to study NO production and consumption in soilsfrom both types of land use as functions of soiltemperature and soil moisture. NO productionincreased exponentially with soil temperature. Thedegree of increase depended on soil moisture,indicating that the response of NO production to achange in soil temperature is most pronounced at acertain intermediate soil moisture. NO productionpeaked at a soil moisture of 0.10 g g^-1, correspondingto 0.27 and 0.38 water-filled pore space for forestand pasture soils, respectively. The optimum soilmoisture for which maximum NO release was observedwas independent of soil temperature. NO consumptionwas most efficient at high soil temperatures andunder dry soil conditions. NO release wasapproximately 10 times larger for forest than pasturesoil. The difference may be related to the higherNO₃ ^- content in forest soil.     

重庆市北碚区SO2、NO2变化趋势及影响因素分析研究

采用2006年-2013年大气自动监测站实时发布的数据,研究分析了SO2与NO2的时间变化规律以及气象影响因素的相关性分析.结果表明,空气质量年均值均低于GB 3095-2012中的Ⅱ级标准;SO2浓度年均值2013年较2006年低45.8％,下降显著,NO2浓度年均值2013年较2006年低5.9％,下降不明显;春冬季空气质量差、夏秋季空气质量好;SO2 、NO2月均值峰值分别出现在2007年11月和2009年3月;相对于SO2浓度更易受到近地面气象因子平均温度的影响而积累或扩散,而NO2浓度更易受到近地面气象因子平均相对湿度的影响而积累或扩散.     

天津PM10和NO2输送路径及潜在源区研究

利用HYSPLIT模型和全球资料同化系统(GDAS)气象数据,用聚类方法对2012年12月~2013年11月期间抵达天津的逐日72h气流后向轨迹按不同的季节进行归类.并利用相应的PM10和NO2浓度日监测数据,分析了不同季节气流轨迹对天津污染物浓度的影响.运用潜在源贡献(PSCF)因子分析法和浓度权重轨迹(CWT)分析法分别模拟了不同季节PM10和NO2潜在PSCF和CWT.结果表明,不同方向气流轨迹对天津PM10和NO2潜在源区分布的影响存在显著差异.天津PM10和NO2日均浓度最高值对应的气流轨迹均集中在冬、春和秋季等来自内陆的西北气流;夏季影响天津的气流轨迹主要来自西北和东南方向,对天津PM10和NO2的日均浓度贡献较小.天津PM10和NO2的PSCF与CWT分布特征类似,最高值主要集中在天津本地以及邻近的河北省和山东省,是天津这两种污染物主要潜在源区.