JOURNAL OF SOILS AND SEDIMENTS
·
2017
·Vol. 17
·期 8
·2202-2213
·
IF 2.522
Ou Taosha,Guan Mengyun,Mai Yongrui,Deng Peiyan,Xiao Yutang,Deng Dayi
Purpose Surface sediments contaminated with high levels of multiple heavy metal(loid) species are very common environmental problems. Especially, the labile and bioaccessible fractions of heavy metal(loid)s in the sediments are posing serious risks to the biota and the overlaying water quality. This study aimed at developing a potential method to manage the activity of the labile fractions of heavy metal(loid)s in surface sediments. Materials and methods This study assessed the feasibility of adding iron powder, a low-cost industrial by-product, to sediments containing high levels of Pb, As, and Cd to adsorb labile fractions of heavy metal(loid)s onto the sorbent surfaces and to retrieve the heavy metal(loid) laden powders by applying external magnetic field. In addition, the redistribution of Pb, Cd, and As in different sediment fractions, the dissolved fraction and the sorbent-adsorbed fraction, was also investigated and characterized. Results and discussion The results indicate that the bioactive labile fractions (exchangeable and carbonate-bound fractions) of heavy metal(loid)s are prone to concentrating onto iron powders and can be selectively removed from the sediments by magnetic retrieval. In addition, iron addition induces conversion of labile fractions of heavy metal(loid)s into more stabilized fractions. Conclusions Overall, the process can effectively minimize the activity of labile fractions of heavy metal(loid)s in surface sediments.
研究领域:
环境科学
·
土壤修复
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Yang Liu,JinAo You,YuJun Li,JiaoDi Zhang,Yong He,Florian Breider,Shu Tao,WenXin Liu
Studies focused only on surface water may underestimate microplastic abundance in aquatic environments. This was the first survey to investigate the vertical (surface, intermediate, and bottom waters) distribution and composition of microplastics (MPs) in the water columns and surface sediments collected from an urban seagoing river in northern China. Microplastic abundance in the water columns ranged from 5.6 to 31.4 items∙L −1 and from 2141 to 10,035 items∙kg −1 dry weight (dw) in the surface sediments. Polyethylene dominated throughout the water columns to the surface sediments, in which low- and high-density polyethylene (LDPE and HDPE) were dominant in the water columns and surface sediments, respectively. The dominant shape of MPs was fibers/lines in both the water column and the surface sediment samples. Different from the estimations, the average abundance of MPs in the surface and intermediate waters was significantly lower ( p < 0.01) than that in the bottom water, which may be due to the resuspension of small-sized MPs in the bottom water. As the MPs size increased, their vertical distributions in the water columns were more affected by the water depth. The results showed that MPs were detained in the water columns of river system, and the high concentrations of MPs in the bottom water could not be neglected.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Bingqing Wang,Haofeng Sun,Jun Gao,Liying Kang,Haixiao Wan,Ying Wu,Hui Ma,Ziling Teng,Xian Xu,Lin Geng,Xiaozhi Wang,Li Ye,Yan Huang,Dongcui Li,Naisheng Jiang
Effective moisturizing agents are crucial for improving the performance of rinse-off cosmetic formulations. Herein, we explored the synergistic effects of trehalose and N 2 -(2,3-dihydroxypropyl)arginine hydrochloride (DPAH), a glycerol derivative of L-arginine, on enhancing surface deposition and moisturizing performance. Using various surface-sensitive characterization techniques, we observed significant enhancements in the surface deposition of the trehalose/DPAH mixture compared to trehalose alone or glycerol-based controls. Molecular dynamics simulations further revealed strong intermolecular hydrogen bonds between trehalose and DPAH, contributing to the observed synergistic effects. A moisture-retention study using a model anionic surfactant-based system demonstrated that the trehalose/DPAH mixture achieves higher skin hydration levels and reduced transepidermal water loss compared to trehalose and DPAH alone. These findings offer new insights into the molecular interactions that enhance the surface deposition and moisturizing efficacy of trehalose, presenting promising opportunities for developing advanced cosmetic formulations with optimized moisture-retaining properties.
研究领域:
化妆品科学
·
分子生物学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 11
·1606-1615
·
IF 4.803
Liu Zihan,Luo Yang,Ning Lianchao,Liu Yong,Zhang Ming
The increasing applications of seawater desalination technology have led to the wide usage of polyamide reverse osmosis membranes, resulting in a large number of wasted reverse osmosis membranes. In this work, the base nonwoven layer of the wasted reverse osmosis membrane was successfully modified into the hydrophobic membrane via surface deposition strategy including TiO 2 and 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFOTS), respectively. Various techniques were applied to characterize the obtained membranes, which were then used to separate the oil—water system. The optimally modified membrane displayed good hydrophobicity with a contact angle of 135.2° ± 0.3°, and its oil—water separation performance was as high as 97.8%. After 20 recycle tests, the oil—water separation performance remained more than 96%, which was attributed to the film adhesion of the anchored TiO 2 and PFOTS layer on the surface. This work might provide a new avenue for recycling the wasted reverse osmosis membrane used in oily wastewater purification.
研究领域:
环境工程
·
材料科学
·
水处理
✓ 已验证
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Huaming Yu,Yuejiao Chen,Weifeng Wei,Xiaobo Ji,Libao Chen
Aqueous Zn metal batteries suffer from rapid cycling deterioration due to the severe water corrosion and dendrite growth on Zn anodes. Herein, a highly antiwater Znx-diethylenetriaminepenta(methylene-phosphonic acid) interface layer with good zinc affinity and special nanoscaled 3D granular structure is designed on Zn metal to address these problems. Experimental results combined with theoretical analysis and COMSOL simulations reveal that the hydrophobic groups in such Zn-based organic complex are the decisive factor in preventing H2O from damaging Zn anode surface. The massive Zn2+ attractive sites formed by interaction of methylene-phosphonic acid groups and Zn cause ion channel for fast zinc-ion adsorption and migration. And the developed nano granular architecture on the surface induces redistributed Zn2+ ion flux to realize homogenization with smooth and compact surface deposition. Under the synergism, such modified anodes exhibit long cycling lifespan over 1300 h with a relatively low polarization voltage at 5 mA cm–2. Also, the assembled full cells (including Zn//V2O5 and Zn//MnO2 cell) based on this anode are also demonstrated. The work provides a simple, low cost, and efficient pathway by combining the two concepts of structural design and constructing protective layers on the surface to prepare high-performance Zn anodes toward prospering aqueous zinc–metal batteries.
研究领域:
材料科学
·
电化学
·
电池技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）