ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 13
·15068-15082
·
IF 3.056
Li Jingqiao,Zhang Wenjing,Qin Yunqi,Li Xiaofei,Wu Shengyu,Chai Juanfen,Du Shanghai
To investigate co-transport behavior of ammonium and colloids in saturated porous media under different hydrochemical conditions, NH 4 + was selected as the target contaminant, and silicon and humic acid (HA) were selected as typical organic and inorganic colloids in groundwater. Column experiments were then conducted to investigate the transport of NH 4 + colloids under various hydrochemical conditions. The results showed that because of the different properties of colloidal silicon and HA after combining with NH 4 + , the co-transport mechanism became significantly different. During transport by the NH 4 + –colloid system, colloidal silicon occupied the adsorption sites on the medium surface to promote the transport of NH 4 + , while humic acid (HA) increased the number of adsorption sites of the medium to hinder the transport of NH 4 + . The co-transport of NH 4 + and colloids is closely related to hydrochemical conditions. In the presence of HA, competitive adsorption and morphological changes of HA caused NH 4 + to be more likely to be transported at a higher ionic strength (IS = 0.05 m, CaCl 2 ) and alkalinity (pH = 9.3). In the presence of colloidal silicon, blocking action caused the facilitated transport to be dependent on higher ionic strength and acidity (pH = 4.5), causing the recovery of NH 4 + to improve by 7.99%, 222.25% (stage 1), and 8.63%, respectively. Moreover, transport increases with the colloidal silicon concentrations of 20 mg/L then declines at 40 mg/L, demonstrating that increased concentrations will lead to blocking and particle aggregation, resulting in delayed release in the leaching stage.
Graphical abstract
研究领域:
环境科学
·
水文学
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2024
·
IF 3.5
Yixin Peng,Mohd Yasir Khan,Yongxiang Gao,Wei Wang
Chemically active colloids that release/consume ions are an important class of active matter, and exhibit interesting collective behaviors such as phase separation, swarming, and waves. Key to these behaviors is the pair-wise interactions mediated by the concentration gradient of self-generated ions. This interaction is often simplified as a pair-wise force decaying at 1/ r 2 , where r is the interparticle distance. Here, we show that this simplification fails for isotropic and immotile active colloids with net ion production, such as Ag colloids in H 2 O 2 . Specifically, the production of ions on the surface of the Ag colloids increases the local ion concentration, c , and attenuates the pair-wise interaction force that scales with ∇ c / c . As a result, the attractive force between an Ag colloid and its neighbor (active or passive) decays at 1/ r or 1/ r 2 for small or large r , respectively. In a population, the attraction of a colloid by a growing cluster also scales with ∇ c / c , so that medium-sized clusters grow fastest, and that the cluster coarsening slows with time. These results, supported by finite element and Brownian dynamic simulations, highlight the important role of self-generated ions in shaping the collective behavior of chemically active colloids.
研究领域:
化学
·
软物质物理
·
材料科学
·
统计物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTEGRATED FERROELECTRICS
·
2020
·
IF 0.557
Hai-Lin Cong,Qian-Qian Song,Song Wang,Bo-Ya Yu,Zhong-Min Geng,You-Qing Shen,Bing Yu
In this article, a magnetic-responsive microfiltration membrane based on three-dimensional (3 D) inverse colloidal crystal (ICC) was prepared with relatively simple approach. We designed the ICC membrane using self-assembly of Fe3O4@SiO2 colloidal crystal into a colloidal crystal template. The resulting close-packed colloidal crystal was infiltrated with a reactive monomer solution. After polymerization, the silica spheres were etched away, resulting in an ICC membrane with Fe3O4 nanoparticles inside. The typical ICC membrane was characterized by SEM and XRD. Meanwhile, We used the KCl diffusion to test the permeability of the membrane. The results illustrated that the highly ordered permeable polymer membrane was successfully prepared by using Fe3O4@SiO2 colloidal crystals as the templates. Furthermore, the functional ICC membrane exhibited excellent magnetic-responsive gating property to separation. The smart environment-responsive gating membranes have potential applications in filtration, sensors and other applications.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 21
·3742
·
IF 5.719
Qiao Li,Xiaosong Zheng,Xiaoyu Shen,Shuai Ding,Hongjian Feng,Guohua Wu,Yaohong Zhang
Colloidal AgBiS2nanocrystals (NCs) have attracted increasing attention as a near–infrared absorbent materials with non–toxic elements and a high absorption coefficient. In recent years, colloidal AgBiS2NCs have typically been synthesized via the hot injection method using hexamethyldisilathiane (TMS) as the sulfur source. However, the cost of TMS is one of the biggest obstacles to large–scale synthesis of colloidal AgBiS2NCs. Herein, we synthesized colloidal AgBiS2NCs using oleylamine@sulfur (OLA–S) solution as the sulfur source instead of TMS and optimized the synthesis conditions of colloidal AgBiS2NCs. By controlling the reaction injection temperature and the dosage of OLA–S, colloidal AgBiS2NCs with adjustable size can be synthesized. Compared with TMS–based colloidal AgBiS2NCs, the colloidal AgBiS2NCs based on OLA–S has good crystallinity and fewer defects.Keywords:AgBiS2;colloidal nanocrystals;hot injection;sulfur source
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL SPECIATION AND BIOAVAILABILITY
·
2018
·
IF 1.362
Bingyi Xie,Yanji Jiang,Zhe Zhang,Gang Cao,Huimin Sun,Nong Wang,Shengsen Wang
The transport of Pb(II) or Cd(II) in subsurface has been studied in the literature; however; their co-transport in porous media in presence of colloids has not been clearly understood. In this work, a series of column experiments were conducted to study Pb(II) and Cd(II) co-transport in saturated porous media under various experimental conditions with different combination of colloidal solution (montmorillonite colloid, manual loessial soil colloid and humic acid), flow rate (0.1, 0.5 and 1.0 ml min−1) and sand grain size (0.4–0.8mm and 0.8–2.0mm). The results showed that increase of flow rate and grain size promoted the mobility of Pb(II) and Cd(II), furthermore, the presences of mobile colloids also enhanced the mobility of the two heavy metals, meanwhile, Cd(II) showed higher mobility than Pb(II) in the columns. Findings from this work enhanced current understanding of the competitive transport and colloid-facilitated transport of heavy metals in saturated porous media.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Na Li,Yong Li,Ruitao Lou,Rongwei Xiong,Hong Xu
The release of internal pollutants in shallow lakes is a widely concerning environmental issue. Colloids widely existing in eutrophic shallow lakes will affect the release and migration of pollutants. In this context, the different effects of two colloids [humic acid (HA) and silica (SiO 2 )], either individual or in coexistence, on the adsorption and migration of ammonia nitrogen (NH 4 + -N) in sediments under different ionic strengths (IS) were analyzed, through a series of batch and column experiments. It was found that, under a relatively low IS condition (1 mM Na + ), SiO 2 colloids greatly enhanced the mobility of NH 4 + -N in sediments. With IS increased (20 mM Na + ), the presence of colloids exhibited an impeding effect on the mobility of NH 4 + -N due to colloidal flocculation and precipitation. While HA colloids largely suppressed the mobility of NH 4 + -N in sediments under either low or high IS conditions. HA colloids are more likely to form aggregates and have more adsorption sites than SiO 2 colloids. In the NH 4 + -N–SiO 2 –HA system, HA colloids also showed a retardant effect on the transport of both SiO 2 colloids and NH 4 + -N, and the retardant effect increased with the increase of HA colloid concentration. Exchange coordination and hydrogen bond force, as well as the decreased stability of the colloid system, played an important role in such a retardant effect, which consequently resulted in more NH 4 + -N adsorption. The transport of colloids in the NH 4 + -N–colloids co-transport system can be successfully described by Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. In addition, with an increase of IS, NH 4 + -N transport was enhanced because of competitive adsorption of the cations and NH 4 + -N on colloids and the porous medium . These results implied that abundant HA colloids and low ion concentration can reduce the risk of NH 4 + -N release and migration in sediments and consequently its exchange flux across the sediment-water interface.
研究领域:
环境科学
·
水文学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2014
·Vol. 21
·期 11
·7219-7226
·
IF 2.757
Xie Jinchuan,Lin Jianfeng,Zhou Xiaohua,Li Mei,Zhou Guoqing
Low-solubility contaminants with high affinity for colloid surfaces may form colloid-associated species. The mobile characteristics of this species are, however, ignored by the traditional sorption/distribution experiments in which colloidal species contributed to the immobile fraction of the contaminants retained on the solids as a result of centrifugation or ultrafiltration procedures. The mobility of the contaminants in subsurface environments might be underestimated accordingly. Our results show that colloidal species of 239 Pu in three-phase systems remained the highest percentages in comparison to both the dissolved species and the immobile species retained on the granite grains (solid phase), although the relative fraction of these three species depended on the colloid types. The real solid/liquid distribution coefficients ( K
s/d ) experimentally determined were generally smaller than the traditional K
s/d (i.e., the K
s+c/d in this study) by ~1,000 mL/g for the three-phase systems with the mineral colloids (granite particle, soil colloid, or kaolinite colloid). For the humic acid system, the traditional K
s/d was 140 mL/g, whereas the real K
s/d was approximately zero. The deviations from the real solid/liquid K
s/d were caused by the artificially increased immobile fraction of Pu. One has to be cautious in using K
s/d -based transport models to predict the fate and transport of Pu in the environment.
研究领域:
环境科学
·
放射生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 47
·28041-28048
·
IF 3.119
Caixia Liu,Baiping Mao,Vanessa Martinez,Xiaojian Chen,Yanan Li,Lingyun He,Sian Chen,Xiaoling Guo,Xian Shen,Xiandan Bao,Haifa Shen,Stefania Lenna,Pinyi Qian,Lingzhi Wu,Chao Li
The outbreak of new coronavirus disease (COVID-19) has quickly spread all over the world. Real time reverse transcriptase polymerase chain reaction (rRT-PCR) for nucleic acid detection has become the standard method for clinical diagnosis of COVID-19 infection. But these rRT-PCR tests have many inherent limitations, and carry a high false negative rate. It is an urgent to develop a method to accurately identify the vast infected patients and asymptomatic viral carriers from the population. In this article, we present the principle and procedure of developing a colloidal gold immunochromatographic assay (GICA) for rapid detection of COVID-19-specific antibodies. The detection kit can be used to detect immunoglobulin M (IgM) and IgG of COVID-19 in human blood samples within 15 minutes, and to identify different stages of viral infection. Test results can be digitalized using an office scanner and a FiJi software with appropriate confidence interval (CI) setting. Based on analysis from 375 samples, we calculated that overall sensitivity and specificity of the assay were 95.85% and 97.47%, respectively. Compared with rRT-PCR, this assay has many advantages including convenience and rapid detection. The detection kit can be widely used in hospitals, clinics and laboratories for rapid screening of both symptomatic and asymptomatic COVID-19 carriers in large scale.
研究领域:
医学
·
病毒学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2019
·Vol. 297
·期 10
·1301-1311
·
IF 1.906
Liu Pin,Qi Chenze,Gao Yong
Colloidosomes have gained intensive attention in the past years due to their substantial applications in wide scopes involving encapsulation, catalysis, and drug delivery, etc. In this study, we depicted the templated fabrication of well-shaped colloidosomes with tunable shell thickness by Pickering emulsion at a mild condition. To this end, toluene-in-water Pickering emulsion stabilized by cetyltrimethylammonium bromide (CTAB)–modified polydopamine (PDA) nanoparticles (PDA@CTAB) was prepared. After the covalent cross-linking of PDA nanoparticles assembled on the surface of an oil droplet through chemical reactions occurring in toluene phase, exclusive intra-colloidosomes were afforded. The shell thickness of colloidsomes could be roughly tuned by the adjustment of the amount of the reactive monomers in the oil phase. Our investigations revealed that CTAB was critical for the successful fabrication of well-shaped colloidosomes. Otherwise, only irregular structures were obtained if pristine PDA–stabilized Pickering emulsion was applied. The current strategy could enable hydrophobic cargo, such as 10-hydroxycamptothecin to be encapsulated while colloidosomes were created. The release behavior of the encapsulated cargoes was also investigated.
CTAB was necessary for the templated fabrication of well-shaped colloidosomes by PDA-stabilized oil-in-water Pickering emulsion
研究领域:
材料科学
·
药物递送
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2017
·Vol. 7
·期 8
·201
·
IF 3.553
Rongfang Wu,Yuehua Yang,Miaozi Li,Donghuan Qin,Yangdong Zhang,Lintao Hou
PbS colloidal quantum dots (CQDs) solar cells have already demonstrated very impressive advances in recent years due to the development of many different techniques to tailor the interface morphology and compactness in PbS CQDs thin film. Here, n-hexane, n-octane, n-heptane, isooctane and toluene or their hybrids are for the first time introduced as solvent for comparison of the dispersion of PbS CQDs. PbS CQDs solar cells with the configuration of PbS/TiO2heterojunction are then fabricated by using different CQDs solution under ambient conditions. The performances of the PbS CQDs solar cells are found to be tuned by changing solvent and its content in the PbS CQDs solution. The best device could show a power conversion efficiency (PCE) of 7.64% under AM 1.5 G illumination at 100 mW cm−2in a n-octane/isooctane (95%/5%v/v) hybrid solvent scheme, which shows a ~15% improvement compared to the control devices. These results offer important insight into the solvent engineering of high-performance PbS CQDs solar cells.Keywords:colloidal quantum dots;solar cells;PbS;solvent engineering
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Zhenning Liu,Bingdi Wang,Shenghui Jin,Zhida Wang,Lei Wang,Song Liang
In this paper, a novel method for the construction of colloidosomes as a microreactor for dual-enzyme cascade biphasic reaction has been reported. A lipase–glucose oxidase (GOx) enzyme pair is employed in this system. A water-soluble enzyme GOx is compartmentalized inside the colloidosomes. A hydrophobic environment-favored enzyme Candida Antarctica lipase B (CalB) is adsorbed on the outer surfaces of the colloidosomes. The catalysis system is set up by introducing these dual-enzyme-immobilized microcapsules into acetic ether. H2O2 is produced in the aqueous phase by the doped GOx, and then H2O2 diffused out of the microcapsules is utilized by CalB to catalyze the oxidation of ethyl acetate. Finally, the formed peracids oxidized N-heteroaromatic in situ. Furthermore, no obvious yield decline is observed in four reaction cycles. Thus, our work provides a new strategy for the design of high-performance biomimicking reactors for multiple enzyme cascade reactions and further expands the potential application area of colloidosomes.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Mengjie Wang,Qiang Zhang,Taotao Lu,Jiuyan Chen,Qiqi Wei,Weifeng Chen,Yanmei Zhou,Zhichong Qi
Given the ubiquitous mineral (e.g., clays and iron oxides) playing critical roles in impacting the fate of antibiotics in the subsurface environment, the effects of two mineral colloids (i.e., ferrihydrite and montmorillonite) on tetracycline (TC, a representative of antibiotic) transport in sand columns were investigated in this study. Interestingly, the results clearly showed that ferrihydrite colloids inhibited TC transport, while montmorillonite colloids enhanced TC mobility under neutral conditions (pH 7.0). This phenomenon resulted from the positively charged ferrihydrite colloids with weak mobility, which assisted TC deposition; besides, providing additional deposition sites for TC by the deposited ferrihydrite colloids was another important mechanism. In contrast, the transport-enhancement effect of montmorillonite on TC was attributed to the strong binding affinity of TC to clay particles as well as the competition between colloids and TC for deposition sites on sand surfaces. Moreover, the transport-inhibition effect of ferrihydrite at pH 7.0 was greater than that at pH 5.0, mainly due to more colloid-associated TC under neutral conditions. Surprisingly, ferrihydrite colloids could act as carriers of antibiotics and enhanced TC transport at pH 9.0. Because the surface charge of colloids was altered to negative and could break through the column. Meanwhile, the transport-enhancement effect of montmorillonite decreased with increasing pH from 5.0 to 9.0, resulting from the decrease of colloid-adsorbed TC. Furthermore, colloid-mediated transport of TC was influenced by ionic strength , which affected the aggregation characteristics of colloids and the binding affinities of TC to minerals. These findings provide critical information for assessing the risks of antibiotics in aquatic ecosystems where abundant natural minerals are present.
研究领域:
环境科学
·
微生物学
✓ 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）