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排序方式: 共有907条查询结果,搜索用时 15 毫秒
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22.
太阳能光催化降解法去除水中罗丹明染料的研究 总被引:16,自引:0,他引:16
在太阳光的紫外线辐射下,应用载有TiO2薄层的平板式光催化反应器,进行了光催化降解法去除水中罗丹明染料的试验,结果表明,当紫外线辐射强度平均为33W/m^2,反应时间为18min时,水中罗丹明染料浓度由10mg/L降至0.01mg/L,在室国家排放标准,探讨了太阳能光催化反应系统的改进方向及工业化应用的有关问题。 相似文献
23.
Liang Chen Syed H. Imam Sherald H. Gordon Richard V. Greene 《Journal of Polymers and the Environment》1997,5(2):111-117
Starch-PVOH cast films were prepared with and without crosslinking agent (hexamethoxymethylmelamine) in the absence of plasticizer.
Moisture absorption in films without crosslinking agent at a low relative humidity was similar to that of PVOH and increased
as the relative humidity increased. Films with crosslinking agent showed moisture absorption linearly proportional to the
relative humidity. Significant improvement in resistance to water disintegration for crosslinked starch-PVOH films was observed.
While the tensile strength decreased with increased relative humidity, crosslinking significantly improved the tensile strength.
Increased PVOH content improved elongation of films even when the relative humidity was 80% or higher. Biodegradation studies
revealed that the degradation rate was negatively correlated with the PVOH content in films and crosslinking generated more
converged degradation curves.
Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard
of the product, and the use of the name by USDA implies no approval of the product to the exclusion of others that may also
be suitable. 相似文献
24.
活性炭膜处理工业废水的试验研究 总被引:2,自引:0,他引:2
将活性炭膜与常规弹性材料同时作为生物接触氧化处理工艺的填料,分别加装在相同条件的两套接触氧化池中,采用生物接触氧化处理工艺,在同样的条件下处理工业废水,经过对试验数据的对比分析得出:以活性炭膜为填料,处理废水的能力更强,净化效果更好。 相似文献
25.
从废感光胶片中回收银 总被引:2,自引:0,他引:2
研究了以Fe3 -乙二胺四乙酸二钠-N a2S2O3体系为浸取剂从废感光胶片中回收银的方法,考察了浸出银的最佳工艺条件。实验表明,当浸取剂中FeC l3.6H2O质量浓度为35g/L、N a2S2O3.5H2O质量浓度为150g/L、pH为7、固液质量比为3∶10时,浸取剂可重复使用6次,胶片上银的浸出率可达99%以上;浸取液中的银采用硼氢化钠还原回收,粗银粉配以熔剂高温熔炼可得到纯度达99.78%的银,银回收率达96.88%,回收银后的浸取液可循环使用。 相似文献
26.
Mechanical Properties with the Functional Group of Additives for Starch/PVA Blend Film 总被引:1,自引:0,他引:1
This paper deals with the mechanical properties and degree of swelling (DS) of starch/PVA blend film with the functional groups
i.e., hydroxyl and carboxyl group, of additives. Starch/PVA blend films were prepared by using the mixing process. Glycerol
(GL) with 3 hydroxyl group, sorbitol (SO) with 6 hydroxyl group, succinic acid (SA) with 2 carboxyl group, malic acid (MA)
with 1 hydroxyl and 2 carboxyl group, tartaric acid (TA) with 2 hydroxyl and 2 carboxyl group and citric acid (CA) with 1
hydroxyl and 3 carboxyl group were used as additives. The results of measured tensile strength (TS) and elongation (%E) verified
that both hydroxyl and carboxyl group as a functional groups increased the flexibility and strength of the film. Values of
DS for GL-added and SA-added films were low. However, DS values of the films added MA, TA or CA with both hydroxyl and carboxyl
group were comparatively high. When the film was dried at low temperature, the properties of the films were evidently improved.
The reason is probably because the hydrogen bonding was activated at low temperature. 相似文献
27.
TiO2光催化氧化的研究进展 总被引:5,自引:0,他引:5
概述了TiO2光催化氧化降解水中污染物的原理及TiO2光催化剂的制备,提出了增强其活性的途径。TiO2光催化氧化可应用于印染、农药、造纸等工业废水及饮用水处理中,研制高效的负栽型纳米TiO2光催化剂、解决太阳能利用问题、开发多功能光催化反应器是今后TiO2光催化氧化的发展趋势。 相似文献
28.
Nugraha E. Suyatma Alain Copinet Lan Tighzert Veronique Coma 《Journal of Polymers and the Environment》2004,12(1):1-6
Biodegradable film blends of chitosan with poly(lactic acid) (PLA) were prepared by solution mixing and film casting. The main goal of these blends is to improve the water vapor barrier of chitosan by blending it with a hydrophobic biodegradable polymer from renewable resources. Mechanical properties of obtained films were assessed by tensile test. Thermal properties, water barrier properties, and water sensitivity were studied by differential scanning calorimeter analysis, water vapor permeability measurements, and surface-angle contact tests, respectively. The incorporation of PLA to chitosan improved the water barrier properties and decreased the water sensitivity of chitosan film. However, the tensile strength and elastic modulus of chitosan decreased with the addition of PLA. Mechanical and thermal properties revealed that chitosan and PLA blends are incompatible, consistent with the results of Fourier transform infrared (FTIR) analysis that showed the absence of specific interaction between chitosan and PLA. 相似文献
29.
30.
利用水热反应法制备β-In2S3纳米颗粒光催化剂,并利用SEM、TEM和XRD等对其进行分析表征;采用土霉素溶液模拟四环素类抗生素废水,探讨In2S3对土霉素的降解效果.结果表明,β-In2S3为立方相纳米颗粒结构,该纳米颗粒由纳米片组成,直径约15~30 nm.以太阳光为辐射光源,In2S3对土霉素具有良好的光催化降解效果,在4 h内对初始浓度为30 mg·L-1的土霉素降解率可达98%以上.降解土霉素后的催化剂在无水乙醇中清洗并烘干,经4次循环利用后,β-In2S3的降解能力仍能达到85%以上,表明β-In2S3光催化剂具有良好的稳定性以及光催化活性. 相似文献