Journal of Coatings Technology and Research
·
2018
·Vol. 16
·期 1
·25-30
·
IF 1.619
Li Pengchong,Cai Chao,Long Yuhua,Zhu Tang,Dong Haixia,Zhu Caizhen,Zhao Ning,Xu Jian
Microsized Cu 2 O particles are widely used in tin-free marine antifouling (AF) paints. Because of the enlarged specific surface area, utilization of Cu 2 O particles with smaller sizes is a potential way to improve the AF efficiency and lower the Cu 2 O content. In this paper, the clay, commonly applied as filler in the paint, was previously used to control the concentration of free Cu 2 + during the synthesis of Cu 2 O. With the help of clay, the size of obtained Cu 2 O particles decreased from 750 to 460 nm. It has been shown that the smaller-sized Cu 2 O can work against the marine biofouling with a lower content (15 wt%) compared to the commercial microsized Cu 2 O (40 wt%) in the 260 days of marine AF field tests.
研究领域:
材料科学
·
海洋生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhihong Yin,Shuangxi Li,Dan Hu,Zhuo Li,Ruoyu Chu,Chenchen Liu,Xinzhu Li,Jiangjun Hu,Liandong Zhu
As an environmentally friendly bioflocculant, chitosan has a great application potential in the field of microalgae harvesting due to its biocompatibility. In this work, three different inorganic clay minerals (kaolin, montmorillonite, and diatomite) were selected to prepare chitosan-clay composite materials (CTS/KAL, CTS/MML and CTS/DTE) as flocculants to harvest microalgae cells. The harvesting capacities of CTS/KAL, CTS/MML and CTS/DTE were accordingly 97.37%, 97.81% and 98.34% for microalgae cells under the dosage of 60 mg/L, microalgae concentration of 0.923 g/L, settling time of 30 min and pH of 10. CTS/DTE showed excellent harvesting performance for microalgae cells, mainly due to the enhancement of charge neutralization, sweeping and bridging effects. Based on the phenomenological theory, the second-order polynomial model was used to analyze the influences of different external factors on the microalgae harvesting efficiency. A reasonable performance relationship between CTS-clays for harvesting of microalgae cells and external factors was established. The analysis of carbohydrates, proteins, and fatty acids of microalgae biomass collected by CTS/KAL, CTS/MML, CTS/DTE and centrifugation showed that the harvesting of CTS-clay did not influence the properties of biomass. The experimental results of water resource recycling and re-cultivation after microalgae harvesting by CTS/KAL, CTS/MML and CTS/DTE exhibited that the growth rates of 50% circulating medium + 50% fresh BG11 culture medium were accordingly 2.512, 2.466 and 2.572 times higher than those of 100% circulating medium. It is concluded that chitosan-clay composite materials are efficient and environmentally friendly flocculants with a great applicable potential in microalgae harvesting.
研究领域:
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ran Yang,Qianqian Chang,Na Li,Hu Yang
Sulfate radical-based advanced oxidation processes have received increasing attention in contaminated water treatment. As an excellent electron donor, microscale zero-valent aluminum (mZVAl) is a promising persulfate (PS) activator. However, the natural oxide layer of mZVAl impedes electron transfer from the core metal. Herein, a composite comprising mZVAl and Fe-bearing clay (mZVAl-NaNAu-2) was obtained through the simple ball milling (BM), which synergistically activates PS for the efficient degradation of various organic contaminants, such as 4-chlorophenol, benzoic acid, nitrobenzene, phenol, and ofloxacin, in water. The sulfate radicals and hydroxyl radicals were the main reactive species but Fe(IV) was minor in this reaction. The BM can cause fracture of the mZVAl powder and promote exposure of the fresh Al 0 surface. Various Fe species in mZVAl-NaNAu-2 at different reaction times were evaluated by extraction experiments, Mössbauer and XPS spectra. Approximately 47.0% of structural Fe(III) was reduced to Fe(II) after BM. The dissolved Fe(II) and structural trioctahedral Fe(II)-Fe(II)-Fe(II) entities were mainly responsible for the homogeneous and heterogeneous activation of PS, and corroded mZVAl acted as an “electron pool” to regenerate the aforementioned Fe(II) species continuously. The mZVAl-NaNAu-2/PS system also presented certain resistance to a natural organic matter and some anions, such as Cl - and NO 3 - . This study provided a new strategy for the efficient removal of organic contaminants from water and also solved the bottleneck of mZVAl in applications due to its dense oxide film.
研究领域:
环境科学
·
水处理
·
高级氧化过程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Abid Ali,Yue Xiao,Lina Song,Jiankun Hu,Qingqing Rao,Muhammad Shoaib,Bilal Ul Amin,Xiaoli Zhan,Qinghua Zhang
The colonization of tiny marine organisms on ship's hull which are connected directly from seawater , is a costly issue. Biofouling contributes to enhanced hydrodynamic drag, which leads to higher consumption of fuel and greenhouse gas emissions . Therefore, the environment-friendly solution is very necessary for anti-biofouling activity. For this purpose, we have synthesized biodegradable polyurethane (CL-PU) composed of ε-CL and 4,4′-methylenebis(cyclohexyl isocyanate) (H 12 MDI) and 1,4 butanediol (1,4 BD). The synthesized CL-PU was further modified with 4, 5-dicholoro-2-octyl-isothiazolone (DCOIT) and clay by mixing of the solution to make composites. Our study showed that CL-PU/DCOIT/clay composite degraded in the artificial seawater (ASW), enzymatic solution and seawater (through laboratory test) due to the contents of clay. Because the existence of clay reduced the size of the spherulite of polycaprolactone (PCL) in the composite, therefore remarkably improved the crystallinity as determined via the polarizing optical microscope (POM) and differential scanning calorimetry (DSC). The composite acted as carrier of antifoulant (DCOIT) and controlled their release rate. The anti-bacterial and anti-diatom experiments exhibited that the composite with DCOIT contents were effective in preventing the accretion of Escherichia coli ( E.coli) (region inhibition 14 mm) and marine diatom Navicula incerta (82.5% reduction). The degradable CL-PU/DCOIT/clay composite will have tremendous durability and excellent anti-fouling activity for marine biofouling owning to sustainability and tunability without being toxic to aquatic biota.
研究领域:
材料科学
·
海洋生物学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）