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131.
132.
柴外光催化氧化-分光光度法测定水体中的总磷 总被引:1,自引:0,他引:1
光催化氧化技术是一种新兴的样品预处理技术,探究新型的光催化氧化消解方法对样品前处理有着显著的优势。本文拟采用二氧化钛为催化剂,通过使用光催化氧化消解方法对水体样品进行前处理,再用分光光度法测定水中的总磷,并与常用消解方法进行对比,确定本方法的准确度与精密度。 相似文献
133.
G. Daniel Sheng 《Environmental pollution (Barking, Essex : 1987)》2009,157(10):2710-2715
The degradation of 17β-estradiol (E2) in sterile soil and Mn-free soil slurries was determined. In 0.075 g ml−1 soil slurry, E2 with an initial concentration of 0.0267 μmol g−1 was rapidly degraded and near equimolar estrone (E1) accumulated. A mass balance involving E2 and E1 existed throughout the reaction. The E2 degradation was thus an oxidation process and E1 was the only product. The concurrent release of Mn(II) during E2 oxidation and a lack of E2 oxidation in Mn-free soil slurry together demonstrated that soil manganese oxides were responsible for E2 oxidation. The degree of E2 oxidation was higher at high pH than at low pH, consistent with the fact that the reaction released protons. This study suggests that manganese oxides may be used as soil amendments to effectively oxidize E2 to less potent E1 in soil. 相似文献
134.
Oxidation of a PAH polluted soil using modified Fenton reaction in unsaturated condition affects biological and physico-chemical properties 总被引:3,自引:0,他引:3
A batch experiment was conducted to assess the impact of chemical oxidation using modified Fenton reaction on PAH content and on physico-chemical and biological parameters of an industrial PAH contaminated soil in unsaturated condition. Two levels of oxidant (H2O2, 6 and 65 g kg−1) and FeSO4 were applied. Agronomic parameters, bacterial and fungal density, microbial activity, seed germination and ryegrass growth were assessed. Partial removal of PAHs (14% and 22%) was obtained with the addition of oxidant. The impact of chemical oxidation on PAH removal and soil physico-chemical and biological parameters differed depending on the level of reagent. The treatment with the highest concentration of oxidant decreased soil pH, cation exchange capacity and extractable phosphorus content. Bacterial, fungal, and PAH degrading bacteria densities were also lower in oxidized soil. However a rebound of microbial populations and an increased microbial activity in oxidized soil were measured after 5 weeks of incubation. Plant growth on soil treated by the highest level of oxidant was negatively affected. 相似文献
135.
El-Ghenymy A Arias C Cabot PL Centellas F Garrido JA Rodríguez RM Brillas E 《Chemosphere》2012,87(10):1126-1133
136.
A new approach to vapor phase elemental mercury capture has been explored; this approach exploits an ionic liquid coating
layer to oxidize elemental mercury for subsequent immobilization by chelating ligands. The room temperature ionic liquid 1-butyl-1-methyl
pyrrolidinium bis(trifluoromethane sulfonyl)imide (P14) was selected for study based on its oxidation potential window, thermal stability, and low vapor pressure. Tests were also
completed in which KMnO4 was added to P14 to form a new ionic liquid, P14–KMnO4, with a higher oxidation potential. In room-temperature bulk liquid phase capture experiments, 59% of the elemental mercury
in the inlet gas was captured using P14 alone; mercury capture using P14–KMnO4 was quantitative. P14 and P14–KMnO4 coatings were successfully applied to mesoporous silica substrates and to silica substrates functionalized with mercury chelating
ligands. The coating layers were found to be thermally stable up to 300°C. Fixed-bed tests of nonfunctionalized silica coated
with P14 showed an elemental mercury uptake of 2.7 mg/g adsorbent at 160°C; at the same temperature, functionalized silica coated
with P14–KMnO4 showed an elemental mercury capacity of at least 7.2 mg/g adsorbent, several times higher than that of activated carbon.
The empty bed gas residence time in these tests was 0.04 s. A chelating adsorbent incorporating P14 in the coating layer, may be capable of simultaneous removal of elemental and oxidized mercury from coal combustion flue
gases. 相似文献
137.
无人监测船在城市内河水质监测中的应用 总被引:1,自引:0,他引:1
采用无人船监测技术结合镇江市内河水质状况普查工作,大于120 h的航行试验,总航行里程约为90 km,对建成区水体中的氨氮(NH3-N)、溶解氧(DO)、氧化还原电位(ORP)和浊度进行原位监测,结果表明,通过合理选择搭载相应的测量电极,无人监测船能够满足地表水测量数据准确度的要求,同时可实现研究区域的监测全覆盖,提升了地表水环境监测的工作效率。 相似文献
138.
Shuchang Wang Binbin Shao Junlian Qiao Xiaohong Guan 《Frontiers of Environmental Science & Engineering》2021,15(5):80
139.
Keke Li Huosheng Li Tangfu Xiao Gaosheng Zhang Aiping Liang Ping Zhang Lianhua Lin Zexin Chen Xinyu Cao Jianyou Long 《Frontiers of Environmental Science & Engineering》2020,14(2):34
140.
Yi Zhao Bo Yuan Zhen Qian Zili Zhang Le Fu Shihang Pan Runlong Hao 《环境科学学报(英文版)》2022,120(10):144-157
Microwave radiation has received extensive attention due to its significant thermal and non-thermal effects, and the development of MW-based denitrification in flue gas has become one of the most promising methods to avoid the defects of ammonia escape, high temperature and cost in traditional SCR. This review introduces the thermal and non-thermal effects of microwaves and divides MW-based denitrification methods into MW reduction and oxidation denitrification, systematically summarizes these denitrification methods, including MW discharge reduction, MW-induced catalytic reduction using active carbon, molecular sieves, metal oxides (transition metals, perovskites, etc.), MW-induced oxidation denitrification with and without additional oxidant, and discusses their removal pathway and mechanism. Finally, several research prospects and directions regarding the development of microwave-based denitrification methods are provided. 相似文献