CHEMOSPHERE
·
2023
·
IF 8.8
Peicheng Huang,Weichun Yang,Qingzhu Li,Qi Liao,Mengying Si,Meiqing Shi,Zhihui Yang
In this study, a novel slightly-soluble selenium (Se) fertilizer (SSF) was successfully applied to address the problems of Cd pollution in paddy soil and rice, and Se deficiency in human beings. The pot and field experiments showed that Cd content in the rice grains was reduced by 48.4%–82.89% and Se content was increased nearly by 30-fold comparing the control group. The application of SSF increased the soil pH and significantly reduced the DGT-extracted Cd in the soil. Moreover, DCB-extractable Fe content on the surface of roots was prompt by SSF, which formed a physical barrier, namely iron plaque (IP), to inhibit Cd translocation to the above-ground tissues of the rice plants. The Cd content in the IP was also decreased before the filling period, possibly contributing to the reduction in major Cd accumulation in the rice grains. In addition, the continuous Se increase and Cd reduction in the IP by the SSF gradually exceeded that of water-soluble Se during the three periods of rice plant growth. This suggests that SSF has high potential to be an effective Se fertilizer for inhibiting Cd uptake and enriching Se in rice.
研究领域:
环境科学
·
植物营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zheshan Duan,Xike Tian,Zihan Zhuang,Yulun Nie,Yong Li,Jianbo Shi
Persulfate (PS) has been proven to be a promising oxidant in the in-situ chemical oxidation (ISCO) process, but its practical application is severely limited due to low utilization rates. This study proposed to prepare a slow-release PS material (Gel-PS) via a green encapsulating method by regulating the mass fractions of gelatin aimed to the continuous and sustainable degradation of tetracycline (TC) in water. The results showed that the 20 % Gel-PS exhibited the best slow-release performance, and the release period reached 11 days and even above 15 days under static and dynamic conditions, respectively. Besides, Gel-PS had a long-term oxidation ability without the aid of catalyst and TC degradation efficiency consistently exceeded 40 % within 6 days. The cumulative TC degradation amount by Gel-PS was 2.18 times higher than single PS system. When Gel-PS was in-situ injected, the degradation efficiency of TC increased to over 70 % and the cumulative amount improved by 1.4 times and 2.96 times compared to Gel-PS hydrogel and single PS. The TC degradation mechanism was further explored based on a series of quenching experiments and EPR analysis. In addition to PS direct oxidation, the contribution of SO 4 •− to TC degradation generated from PS activation by alkaline groups in gelatin even reached to 42.11 %. This work provides an efficient and expandable functionalized PS-based oxidant for in-situ continuous and sustainable water remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·
IF 2.8
Zixin Lin,Guanghui Wang,Zhongkui Zhou,Nansheng Deng,Xuewen Zhang
BACKGROUND Soil in uranium mining areas is contaminated by uranium and associated heavy metals, posing a significant threat to human health and ecological security. Chelating agent assisted phytoremediation is a cost-effective and ecologically friendly remediation approach for uranium and associated heavy metals contaminated soil. In this work, a novel slow-release composite chelating agent (SR CMC-g-CMCD -EDTA/AC) was fabricated using carboxymethyl chitosan-graft-carboxymethyl-β-cyclodextrin (CMC-g-CMCD) as a slow-release carrier and EDTA/ammonium citrate (AC) as a composite chelating agent through the spray drying method, which was used for phytoremediation of soil co-contaminated with uranium and chromium. RESULTS CMC-g-CMCD exhibited superior slow-release performance for both EDTA and AC in comparison with CMC and CMCD. When applied to soil contaminated with uranium (U) and chromium (Cr), SR CMC-g-CMCD -EDTA/AC effectively regulated the release of U and Cr. Sunflowers ( Helianthus annuus L.) grown in treated soil showed a significant increase in U and Cr uptake by 70.55% and 35.55%, respectively, and reduced leaching losses by 34.88% and 37.42%. CONCLUSION SR CMC-g-CMCD -EDTA/AC not only assists in the phytoremediation of soil co-contaminated with U and Cr but also reduces the risk of leaching into groundwater during the soil phytoremediation process. SR CMC-g-CMCD -EDTA/AC-assisted phytoremediation technology was an effective and environmentally friendly remediation means for the removal of U and heavy metals from contaminated soils in uranium mining areas. © 2024 Society of Chemical Industry (SCI).
研究领域:
环境科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yueqian Yan,Xiaohong Zhou,Wen Jin,Xingyuan Wang,Lei Song,Ziyi Luo,Tuqiao Zhang,Miaomiao Ye
Fenton reaction is a traditional advanced oxidation process that has long been used for wastewater treatment. However, the narrow pH range of 2–4, the inefficient utilization of both H 2 O 2 and Fe 2+ , and the large amount of iron sludge formation limit its application. Here, we prepared sodium alginate composite hydrogel spheres with both Fe 2+ and CoS 2 loading (denoted as CoS 2 /Fe/SA hydrogel spheres) to construct a CoS 2 /Fe/SA + H 2 O 2 reaction system. The degradation efficiency of carbamazepine (CBZ) in the CoS 2 /Fe/SA + H 2 O 2 system was significantly enhanced with a first-order kinetic reaction constant of 0.1958 min −1 , which is 8.9 times higher than that in Fe 2+ +H 2 O 2 system. When the initial solution pH was in the range of 2–8, the removal rate of CBZ at 90 min reaction time ranged from 96.5 % to 99.9 %. The enhanced degradation efficiency even in a slightly alkaline aqueous solution was due to the sustained slow release of Fe 2+ from the CoS 2 /Fe/SA hydrogel spheres that enhances the utilization of Fe 2+ and the promotion of Fe 3+ /Fe 2+ cycling via CoS 2 . Moreover, the release amount of Fe 2+ in CoS 2 /Fe/SA hydrogel spheres could be controlled by tuning the Fe 2+ loading amount during preparation, which in turn determines its number of cycling uses.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Hongliang Wei,He Wang,Huijuan Chu,Jingjing Li
In this work, a kind of slow-release and water-retention fertilizer was fabricated by free radical copolymerization of potato starch, acrylic acid, acrylamide, and β-cyclodextrin modified by maleic anhydride, accompanying halloysite nanotubes whose cavities were enlarged by acidification and loaded with urea in advance. The fertilizer was characterized by FTIR, TGA , SEM, TEM, and XRD. Its swelling behavior in distilled water and salt solutions as well as the ability to hold water was studied by weighing method. Finally, its controlled-release behavior to urea was investigated. The results suggested the as-prepared fertilizer had good abilities to retain water and control urea release. Moreover, the addition of halloysite helped to improve the release properties of the fertilizer. The study on urea release kinetics indicated the release behavior of urea in water was controlled by its concentration, whereas the release behavior of urea in soil fitted with Fickian diffusion mechanism.
研究领域:
农业科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 48
·46885
·
IF 1.901
Yu Cao,Jiayu Li,Jun Liu,Yuying Tang,Huan Liu,Yan Jiang,Hongwen Zhang
Four inclusion complexes were synthesized from β-cyclodextrin (β-CD) copolymers and potassium sorbate (PSA) using the self-assembly principle. Reactive β-CD monomers carrying unsaturated ester functional groups [β-CD-acryloyl chloride (AC)] were synthesized from β-CD and AC and copolymerized with styrene to obtain β-CD copolymers of the general formula poly(β-CD-AC- co -St). These β-CD copolymers having cavity structures were complexed with PSA to obtain the corresponding inclusion complexes of the general formula poly(β-CD-AC- co -St)/PSA. These complexes were added to the polystyrene (PS) sheets, as an antibacterial additive, to inhibit the adhesion and growth of bacteria on its surface. The chemical and physical structures of copolymers were characterized by Fourier transform infrared, nuclear magnetic resonance, and the slow release performance was investigated using ultraviolet spectroscopy. The results showed that the composition of the copolymers and their molecular weight could be controlled by changing the rate of charge while the rate and the amount of slow release could be controlled by altering the content of β-CD in the copolymer. The PS sheets containing the inclusion complexes exhibited excellent antibacterial activity that significantly reduced the adhesion of yeast and Staphylococcus aureus to its surface. With the increase of the β-CD content in the copolymers, they contained more of PSA and their bacteriostatic property became more pronounced. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46885.
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Na Wu,Zhicheng Ye,Kangfu Zhou,Feifei Wang,Cheng Lian,Yazhuo Shang
Liquid crystal emulsion is a new type of emulsion, in which the emulsifier molecules are located at the oil/water (O/W) interface and form a long-range ordered and short-range disordered lamellar liquid crystal. The lamellar liquid crystal formed by the emulsifier is similar to the skin stratum corneum lipid structure, which enables it to have a broad application prospect in the fields of cosmetics, pharmaceuticals, etc. In this work, a liquid crystal nanoemulsion was obtained by passing a liquid crystal emulsion stabilized by hydrogenated lecithin and phytosterol combination through a microfluidizer. The microstructure of the prepared liquid crystal nanoemulsion was investigated experimentally by dynamic light scattering, transmission electron microscopy, and small-angle X-ray scattering. The results have shown that the nanoemulsion inherited the liquid crystal emulsion property, namely, the long-range ordered and short-range disordered lamellar structure still existed at the oil/water interface even though they underwent extrusion, friction, and acceleration. At the same time, the underlying mechanisms of the existence of lamellar liquid crystal between the oil phase and the water phase for the nanoemulsion were explored theoretically by molecular dynamics simulations. The simulation results elucidated that the hydrogenated lecithin and phytosterol combination improved the flexibility of the bilayer structure composed of emulsifiers. The bilayers were the basic structure units of lamellar liquid crystals, and thus, the improved flexibility of bilayers provided insurance for the existence of lamellar liquid crystals with larger curvature around the oil droplets. In addition, the applicable properties of liquid crystal nanoemulsion were studied, and the results have shown that the liquid crystal nanoemulsion presented better slow-release and moisturizing properties than traditional nanoemulsions due to the existence of multilayers between oil and water phases. This work not only provides necessary information for the development and effective application of liquid crystal emulsions but also is helpful for in-depth understanding the inner properties of lamellar liquid crystal at molecular level.
研究领域:
化妆品科学
·
药学
·
材料科学
·
分子动力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Anesthesia
·
2024
·Vol. 38
·期 2
·232-243
·
IF 2.8
Zheng Ling-xi,Yu Qian,Li Qiang,Zheng Chuan-dong
Purpose Lidocaine microspheres can prolong the analgesic time to 24–48 h, which still cannot meet the need of postoperative analgesia lasting more than 3 days. Therefore, we added Fe 3 O 4 to the lidocaine microspheres and used an applied magnetic field to attract Fe 3 O 4 to fix the microspheres around the target nerves, reducing the diffusion of magnetic lidocaine microspheres to the surrounding tissues and prolonging the analgesic time. Methods Fe 3 O 4 –lidocaine–PLGA microspheres were prepared by the complex-emulsion volatilization method to characterize and study the release properties in vitro. The neural anchoring properties and in vivo morphology of the drug were obtained by magnetic resonance imaging. The nerve blocking effect and analgesic effect of magnetic lidocaine microspheres were evaluated by animal experiments. Results The mean diameter of magnetically responsive lidocaine microspheres: 9.04 ± 3.23 μm. The encapsulation and drug loading of the microspheres were 46.18 ± 3.26% and 6.02 ± 1.87%, respectively. Magnetic resonance imaging showed good imaging of Fe 3 O 4 –Lidocain–PLGA microspheres, a drug-carrying model that slowed down the diffusion of the microspheres in the presence of an applied magnetic field. Animal experiments demonstrated that this preparation had a significantly prolonged nerve block, analgesic effect, and a nerve anchoring function. Conclusion Magnetically responsive lidocaine microspheres can prolong analgesia by slowly releasing lidocaine, which can be immobilized around the nerve by a magnetic field on the body surface, avoiding premature diffusion of the microspheres to surrounding tissues and improving drug targeting.
研究领域:
药剂学
·
神经科学
·
医学影像学
✓ 已验证
DOI
PubMed
高影响因子
ACS Omega
·
2025
·
IF 4.3
Yunlong Chen,Jinliang Li,Liman Liu,Yi Li
Coal seam mining generates significant dust, posing serious threats to the safety of mining and the well-being of miners. This study suggests a delayed cross-linking approach to convert the dust suppressant into a gel within the coal seam, introduces a controllable slow-release ionic cross-linking dust suppressant, investigates its seepage behavior, and evaluates its dust suppression effectiveness in a coal seam. The experimental results show that the dust suppressant exhibits low viscosity and high fluidity during injection into the coal seam, facilitating effective infiltration into the seam. By managing the release rate of Ca2+ in the slow-release system, the gelation time of the dust suppressant within the coal seam can be controlled efficiently. While reducing the viscosity, increasing injection pressure promotes material seepage in the coal seam. The optimized injection pressure for the dust suppressant is 7 MPa, and its seepage behavior in the coal seam postinjection resembles that of water. The dust suppressant cross-links and reacts to form a macromolecular mesh structure in tiny internal pores and on the coal seam surface, enhancing the water retention and toughness of the coal seam. These combined mechanisms effectively reduce dust production during coal seam mining, achieving a source reduction of dust production.
研究领域:
采矿工程
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Small Methods
·
2023
·Vol. 7
·期 4
·2201663
·
IF 12.4
Siyuan Lin,Shuyue Wu,De'en Guo,Han Huang,Xuefan Zhou,Dou Zhang,Kechao Zhou,Wenhao Zhang,Yue Hu,Yongli Gao,Conghua Zhou
Fast reaction between organic salt and lead iodide always leads to small perovskite crystallites and concentrated defects. Here, polyacrylic acid is blended with organic salt, so as to regulate the crystallization in a two-step growth method. It is observed that addition of polyacrylic acid retards aggregation and crystallization behavior of the organic salt, and slows down the reaction rate between organic salt and PbI 2 , by which “slow-release effect” is defined. Such effect improves crystallization of perovskite. X-ray diffraction study shows that, after addition of 2 m m polyacrylic acid, average crystallite size of perovskite increases from ≈40 to ≈90 nm, meanwhile, grain size increases. Thermal admittance spectroscopy study shows that trap density is reduced by nearly one order (especially for deep energy levels). Due to the improved crystallization and reduced trap density, charge recombination is obviously reduced, while lifetime of charge carriers in perovskite film and devices are prolonged, according to time-resolved photoluminescence and transient photo-voltage decay curve tests, respectively. Accordingly, power conversion efficiency of the device is promoted from 19.96 (±0.41)% to 21.84 (±0.25)% (with a champion efficiency of 22.31%), and further elevated to 24.19% after surface modification by octylammonium iodide.
研究领域:
材料科学
·
光伏技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ning Deng,Huichao Zhu,Zhiheng Fan,Changjin Guo,Jie Hu,Xin Huang
Phosphate recovery presents an effective solution to address the conflicting problems of phosphorus pollution and scarcity. However, recovering organic phosphates, such as 1-hydroxyethane 1,1-diphosphonic acid (HEDP), is comparatively complex, which involves multiple processes. Herein, we developed an innovative all-in-one solution to simplify these processes by combining NiFe-layered double hydroxides (NiFe-LDH) and peroxydisulfate (PDS). This combination achieved approximately 90 % conversion of HEDP to orthophosphate, with 100 % of the resulting orthophosphate recovered in 120 min. The exceptional performance in simultaneous HEDP degradation and recovery can be attributed to dual roles of Ni and Fe in NiFe-LDH/PDS. The polyvalent Ni functions as an electron shutter (Ni 2+ ⇋ Ni 3+ ⇋ Ni 2+ ) in the redox cycles between PDS and HEDP, accounting for effective HEDP degradation. The high complexation stability between Fe(Ⅲ) and orthophosphate (log K = 9.92) allows Fe(Ⅲ) to serve as binding sites for orthophosphate recovery. Moreover, NiFe-LDH/PDS effectively treats HEDP across wide pH ranges (3–––10), which can be ascribed to pH buffers originating from protonation/deprotonation in NiFe-LDH layers. The recovered phosphorus with NiFe-LDH exhibited a slow-release property under soil water solution without notable Ni release, which highlighted its potential usage as a slow-release fertilizer. These features—catalytic and binding sites, and high compatibility—allow NiFe-LDH to achieve concurrent degradation and recovery of organic phosphate in a single solution.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENTIA HORTICULTURAE
·
2024
·
IF 3.9
Huajun Kang,Tengfei Fan,Yanxia Shi,Xuewen Xie,Lei Li,Sheng Xiang,Jianming Xie,Baoju Li,Ali Chai
Biological control agents are beneficial microorganisms that protect plants from disease. However, the effectiveness and viability of microorganisms are often influenced by severe environmental conditions. Encapsulation of microbial cells can protect them from biotic and abiotic stresses. The objectives of this work were to encapsulate Bacillus velezensis ZF481 (ZF481) with chitosan and carrageenan to prepare macrospheres and evaluate their control effect on clubroot disease. Macrospheres with different ratios of chitosan (2 % w/w)/carrageenan (0.3 % w/v) were synthesized by an ionic gelation method, and the bacterial cells of ZF481 were loaded into macrospheres. The maximum swelling ratio (634 %) and maximum survival rate (64.72 ± 2.65 %) were obtained from macrospheres with chitosan: carrageenan ratio of 1: 1. The number of bacteria released from macrospheres into sterile phosphate buffer solution (pH 7.4) reached a release balance after 48 h. The bacteria could be slowly released from macrospheres into the soil. The survival rate of the encapsulated bacteria respectively was 73.33 % and 67.31 % when stored at 4 °C and 25 °C for 80 days, respectively. The control efficiency of ZF481 macrospheres (chitosan: carrageenan, 1: 1) on clubroot disease in pak choi under greenhouse conditions and Chinese cabbage under field conditions was significantly higher than that of ZF481 culture. Moreover, the ZF481 macrospheres also enhanced the plant growth. Collectively, chitosan and carrageenan are ideal wall materials for preparing slow-release bacterial macrospheres to control clubroot. The macrospheres retard the release of B.velezensis ZF481 in soils and significantly improve its biocontrol efficiency on clubroot in pak choi and Chinese cabbage. Thus, this study paves the way for forming formulations against the clubroot disease.
研究领域:
植物病理学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）