共查询到7条相似文献,搜索用时 4 毫秒
1.
K. L. Salipira B. B. Mamba R. W. Krause T. J. Malefetse S. H. Durbach 《Environmental Chemistry Letters》2007,5(1):13-17
Some organic compounds are major water pollutants. They can be toxic or carcinogenic even at low concentrations. Current technologies,
however, fail to remove these contaminants to parts per billion (ppb) levels. Here we report on the removal of organic pollutants
from water using cross-linked nanoporous polymers that have been copolymerized with previously functionalized carbon nanotubes.
These novel polymers can remove model organic species such as p-nitrophenol by as much as 99% from a 10 mg/L spiked water sample compared to granular activated carbon and native cyclodextrin
polymer that removed only 47 and 58%, respectively. These polymers have also demonstrated the ability to remove trichloroethylene
(10 mg/L spiked sample) to non-detectable levels (detection limit <0.01 ppb) compared to 55 and 70% for activated carbon and
native cyclodextrin polymers, respectively. 相似文献
2.
Chengyuan SU Weiguang LI Xingzhe LIU Xiaofei HUANG Xiaodan YU 《Frontiers of Environmental Science & Engineering》2016,10(1):37-45
A study of the decolorization of reactive brilliant blue in an aqueous solution using Fe-Mn-sepiolite as a heterogeneous Fenton-like catalyst has been performed. The Fourier transform infrared (FTIR) spectra of the catalyst showed bending vibrations of the Fe-O. The X-ray diffraction (XRD) patterns of the catalyst showed characteristic diffraction peaks of α-Fe2O3, γ-Fe2O3 and MnO. A four factor central composite design (CCD) coupled with response surface methodology (RSM) was applied to evaluate and optimize the important variables (catalyst addition, hydrogen peroxide dosage, initial pH value and initial dye concentration). When the reaction conditions were catalyst dosage= 0.4 g, [H2O2]= 0.3 mL, pH= 2.5, [reactive brilliant blue]o = 50 mg·L−1, and volume of solution= 500 mL at room temperature, the decolorization efficiency of reactive brilliant blue was 91.98% within 60 min. Moreover, the Fe-Mn-sepiolite catalyst had good stability for the degradation of reactive brilliant blue even after six cycles. Leaching of iron ions (<0.4 mg·L−1) was observed. The decoloring process was reactive brilliant blue specific via a redox reaction. The benzene ring and naphthalene ring were first oxidized to open ring; these were then oxidized to the alcohol and carboxylic acid. The reactive brilliant blue was decomposed mainly by the attack of ·OH radicals including surface-bound ·OH radicals generated on the catalyst surface. 相似文献
3.
Monofunctionalized cyclodextrin polymers for the removal of organic pollutants from water 总被引:1,自引:0,他引:1
B. B. Mamba R. W. Krause T. J. Malefetse E. N. Nxumalo 《Environmental Chemistry Letters》2007,5(2):79-84
Water is an important resource for domestic, industrial, agricultural and recreational purposes. The quality of water is however
significantly deteriorating due to the accumulation of organic pollutants in aqueous systems. Conventional water treatment
technologies fail to remove these contaminants to desirable levels. Recent studies have revealed that cyclodextrin nanoporous
polymers are capable of absorbing pollutants from water to parts per billion levels. We have demonstrated that functionalised
cyclodextrin polymers have enhanced absorption capacities for some organic pollutants. Here we report the synthesis of several
insoluble monosubstituted cyclodextrin polymers or “nanosponges”. We show that these polymers have improved abilities in the
absorption of p-nitrophenol and pentachlorophenol from aqueous solutions. 相似文献
4.
Wei Mao Lixun Zhang Tianye Wang Yichen Bai Yuntao Guan 《Frontiers of Environmental Science & Engineering》2021,15(4):52
5.
The present work, in which cellulose isolated from formic acid fractionation(FAC) is decorated with polyetherimide(PEI) to attain highly efficient cellulose-derived PdAgbimetallic catalyst(PdAg-PEI-FAC), has been investigated, and the catalyst properties are characterized by XRD, XPS, BET, ICP-AES and HAADF-STEM. The as-obtained Pd3.75Ag3.75-PEI-FAC exhibits excellent catalytic performance for H2 evolution from a sodium formate-free formic acid(FA) aqueous medium at ambient... 相似文献
6.
Xuemin Hao Guanlong Wang Shuo Chen Hongtao Yu Xie Quan 《Frontiers of Environmental Science & Engineering》2019,13(5):77
7.
Xinyi Liu Caichao Wan Xianjun Li Song Wei Luyu Zhang Wenyan Tian Ken-Tye Yong Yiqiang Wu Jian Li 《Frontiers of Environmental Science & Engineering》2021,15(4):54