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11.
树脂负载Fe3+/Cu2+多相类芬顿降解染料橙黄 总被引:2,自引:1,他引:2
制备了新型多相类Fenton催化剂(Fe3+cu2+)/R(Fe3+和cu2+同时负载于离子交换树脂),以橙黄Ⅳ为研究对象,探讨了初始过氧化氢浓度、橙黄Ⅳ浓度、催化剂量、初始pH值及温度等因素对催化反应速率的影响,并对该催化剂重复使用性能进行测试.研究结果表明,该催化剂(Fe3++Cu2+)/R与Fe3+/R相比表现出更好的催化过氧化氢分解的活性,使橙黄Ⅳ的降解率提高10%;催化过氧化氢氧化橙黄Ⅳ的反应遵循假一级反应动力学,反应活化能为10.71 kJ·mol-1;催化剂表现出良好的重复使用性能,Fe3+和cu2+在树脂表面负载比较牢固,具有较好的稳定性和耐用性.同时,电子顺磁共振(EPR)测试结果表明,cu2+的掺杂能有效地促进OH·的产生;X射线光电子能谱(XPS)测试结果表明,反应过程中存在高价态铁物种.因此,在该体系反应过程中产生的活性物种是OH·和高价态铁同时共存. 相似文献
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Can Shen Xiangping Gu Bin Yang Dexian Zhang Zhilin Wang Zhengxiang Shu Jeffrey Dick Anhuai Lu 《环境科学学报(英文版)》2020,32(3):156-166
Different natural sphalerites have a range of photocatalytic properties that can potentially be exploited for environmental remediation purposes. To develop value in the exploitation of sphalerite, samples were collected from 19 ore deposits in China and characterized for their mineralogical and photocatalytic properties. X-ray diffraction (XRD) and electron probe micro analysis (EPMA) measurements indicated that all the natural sphalerites from various localities crystallized in cubic phases with various chemical compositions. The substitution of Fe for Zn ranged from 0.235% to 14.826% by weight, Mn from 0.004% to 4.868%, Cu from 0.009% to 5.529% and Cd from 0.133% to 1.576%. As Fe became more abundant, the color of natural sphalerite darkened, becoming almost black; and higher Fe content was associated with stronger visible light absorption. Photoluminescence spectra showed emission mainly related to S-vacancies and progressively decreasing fluorescence intensity with increasing Fe content. Tests of the photocatalytic degradation of methyl orange indicated that the sample with the highest Cd content but moderate Fe content had the highest photocatalytic activity. Specifically, the degradation of Methyl Orange (30 mg/L) attained 82.11% efficiency under visible light irradiation for 4 hr of natural sphalerite with 4.262% Fe and 1.576% Cd. Overall, the Fe content in sphalerite was found to contribute to the visible light absorption ability and the recombination rate of photo-generated electrons and holes, while substitution by Cd was observed to have a greater effect on the photocatalytic properties. These findings provide a scientific basis for the profitable utilization of base metal resources like sphalerite. 相似文献
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从活性污泥中筛选得到一株对偶氮染料酸性橙7(Acid Orange 7)具有高效脱色功能的菌株,根据16S rRNA基因序列分析鉴定,该菌属于嗜水气单胞菌属,将其命名为Aeromonas hydrophila strain JL-1.同时,研究了该菌株对偶氮染料酸性橙7的最佳脱色条件,结果表明,菌株JL-1在缺氧振荡培养条件下能对偶氮染料酸性橙7进行有效脱色;培养基、初始染料浓度、接种量、pH和NaCl浓度等环境条件对菌株JL-1脱色性能及其生长有明显影响.pH为5.0、盐度为10%、温度为30℃、转速为150 r·min~(-1)的LB(Luria-Bertani medium)培养基为菌株JL-1最佳的脱色及生长环境;在此最佳环境条件下,菌株JL-1对100 mg·L~(-1)的偶氮染料AO7在8 h的脱色率高达95%.另外,该菌株耐盐性良好,能在高达30%盐度下依然可以进行有效的生物脱色. 相似文献
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经过对脱毒后的摩洛哥脐血橙和本地几个主栽橙类良种进行比较,结果显示,摩洛哥脐血橙属迟熟良种,比普通甜橙晚熟80~90d,比晚熟甜橙早熟30~40d,其果形椭圆,表皮光滑,无核,品质好,产量高. 相似文献
17.
The US Clean Water Act and habitat replacement: evaluation of mitigation sites in Orange County,California, USA 总被引:2,自引:2,他引:0
Both permit requirements and ecological assessments have been used to evaluate mitigation success. This analysis combines
these two approaches to evaluate mitigation required under Section 404 of the United States Clean Water Act (CWA) and Section
10 of the Rivers and Harbors Act, which allow developers to provide compensatory mitigation for unavoidable impacts to wetlands.
This study reviewed permit files and conducted field assessments of mitigation sites to evaluate the effectiveness of mitigation
required by the US Army Corps of Engineers for all permits issued in Orange County, California from 1979 through 1993. The
535 permit actions approved during this period allowed 157 ha of impacts. Mitigation was required on 70 of these actions,
with 152 ha of enhanced, restored, and created habitat required for 136 ha of impacts. In 15 permit actions, no mitigation
project was constructed, but in only two cases was the originally permitted project built; the two cases resulted in an unmitigated
loss of 1.6 ha. Of the remaining 55 sites, 55% were successful at meeting the permit conditions while 11% failed to do so.
Based on a qualitative assessment of habitat quality, only 16% of the sites could be considered successful and 26% were considered
failures. Thus, of the 126 ha of habitat lost due to the 55 projects, only 26 ha of mitigation was considered successful.
The low success rate was not due to poor enforcement, although nearly half of the projects did not comply with all permit
conditions. Mitigation success could best be improved by requiring mitigation plans to have performance standards based on
habitat functions. 相似文献
18.
橙色GDP及其演变规律 总被引:1,自引:12,他引:1
刘铁民 《中国安全生产科学技术》2005,1(2):3-6
在分析我国工伤事故发生和演变规律及其与经济增长率(以GDP为指标)之间关系的基础上,提出了橙色(安全预警色)GDP的概念和内容,并进行初步论证.认为橙色GDP应成为评价经济社会发展质量的标志之一,也可以作为经济增长与社会进步统筹失调的预警信号. 相似文献
19.
Hofmann T Wendelborn A 《Environmental science and pollution research international》2007,14(4):223-224
PCDD/Fs are hydrophobic organic substances and strongly sorbing to soil particles. Once adsorbed to soil particles they are
believed to be virtually immobile. However, research in the last decades confirmed that strong sorbing contaminants may reach
the groundwater via colloid-facilitated transport. This pathway has not been investigated before in Vietnam. Ma Da area, 100
km north of Ho Chi Minh City, was repeatedly sprayed during the Vietnam War (1962–1971) with herbicides like Agent Orange
containing, beside others, the teratogenic contaminant 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). 11 surface soil samples and 12 water samples were collected in Ma Da area for analysis of PCDD/Fs in solids.
Soil TCDD concentrations ranged from 1–41 ppt with a mean of 8.8 ppt and a mean I-TEQ of 9.7 ppt. Two surface water samples
showed colloid bound TCDD (7 and 19 ppt). Groundwater samples showed elevated colloid bound PCDD concentrations (mean 770
ng/kg), mainly octachlorodibenzo-p-dioxin. Groundwater colloids separated by filtration did not show any TCDD. The results support that TCDD/Fs can be relocated
from the top soil to the groundwater by colloidal pathway. They did not provide evidence that the dioxins bound to groundwater
colloids are leftovers from the Second Indochinese War. However, this study reinforces that the colloidal transport pathway
has to be included investigating the relocation of strong sorbing organic contaminants. 相似文献
20.
为研究磁性纳米Fe3O4/CeO2复合材料在高浓度难降解有机废水处理中的应用,利用共沉淀法制备Fe3O4/CeO2复合材料,并将其作为非均相类Fenton催化剂降解橙黄G染料废水,利用单因素法优化出最佳降解工艺,同时利用TOF-MS/MS(飞行时间质谱)检测降解中间产物,推测出可能降解途径.结果表明,当Ce/Fe为1 :1(质量比)时制备的Fe3O4/CeO2复合材料催化效果最佳.最佳降解工艺条件:初始pH为2.0,温度为30 ℃,H2O2投加量为30 mmol/L,Fe3O4/CeO2复合材料的投加量为2.0 g/L,初始ρ(橙黄G)为50 mg/L.在最佳降解工艺条件下反应120 min后,橙黄G去除率为96.2%,TOC去除率为65.0%,Fe3O4/CeO2复合材料至少可重复利用6次.研究显示,橙黄G降解主要有三条可能的降解途径,包括偶氮键断裂、偶氮键与苯环断开、脱磺酸基、羟基化以及开环等过程,共检测出八种可能的降解中间产物,主要有苯胺、苯酚、萘酚以及羧酸等. 相似文献