ACS Omega
·
2018
·
IF 0
Da-xia Zhang,Xian-peng Zhang,Jian Luo,Bei-xing Li,Yan Wei,Feng Liu
To reduce the amount of organic solvents in pendimethalin emulsifiable concentrate (EC), small-size microcapsules (S-MCs) and large-size microcapsules (L-MCs) were prepared with polyurea as a wall material. Petri-dish bioassays were carried out to investigate the bioactivity of formulations and the influence of both organic matter and moisture. The relationships between degradation and the biological activity of three pendimethalin formulations in the soil were investigated, and field experiments were executed to verify the laboratory results. The laboratory tests showed the following: (1) the bioactivity of EC and S-MCs was similar and greater than that of L-MCs; (2) organic matter could reduce the bioactivity of MCs and EC, and the impact of organic matter on L-MCs was greater; (3) increased soil moisture content had no significant effect on the bioactivity of EC but slightly reduced that of the MCs; and (4) the L-MCs showed significantly more prolonged residual and effective persistence in the soil than did EC and S-MCs. However, the field experiments indicated that the herbicidal efficacies of L-MCs at the early and late stages were both lower than those of EC. Comprehensive analysis of the results indicated that the main reason that the herbicidal efficacy of L-MCs was lower than that of EC in the field was that L-MCs missed the optimal herbicidal periods due to the slow-release characteristics of L-MCs. The S-MCs had both similar release rates and herbicidal efficacy in the field as EC. Therefore, to develop a good pesticide formulation, the occurrence and damage characteristic of pests must be considered.
研究领域:
农业科学
·
植物保护
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Jie-wen Ma,Ya-qing Wu,Chen-Lu Xu,Zhuan-xi Luo,Rui-lian Yu,Gong-ren Hu,Yu Yan
Roxarsone (3-nitro-4-hydroxyphenylarsonic acid, Rox(V)), an extensively used organoarsenical feed additive, enters soils through the application of Rox(V)-containing manure and further degrades to highly toxic arsenicals. Microplastics , as emerging contaminants , are also frequently detected in soils. However, the effects of microplastics on soil Rox(V) degradation are unknown. A microcosm experiment was conducted to investigate soil Rox(V) degradation responses to polyethylene (PE) microplastics and the underlying mechanisms. PE microplastics inhibited soil Rox(V) degradation, with the main products being 3-amino-4-hydroxyphenylarsonic acid [3-AHPAA(V)], N -acetyl-4-hydroxy-m-arsanilic acid [N-AHPAA(V)], arsenate [As(V)], and arsenite [As(III)]. This inhibition was likely driven by the decline in soil pH by PE microplastic addition, which may directly enhance Rox(V) sorption in soils. The decreased soil pH further suppressed the nfnB gene related to nitroreduction of Rox(V) to 3-AHPAA(V) and nhoA gene associated with acetylation of 3-AHPAA(V) to N-AHPAA(V), accompanied by a decrease in the relative abundance of possible Rox(V)-degrading bacteria (e.g., Pseudomonadales), although the diversity, composition, network complexity, and assembly of soil bacterial communities were largely influenced by Rox(V) rather than PE microplastics. Our study emphasizes microplastic-induced inhibition of Rox(V) degradation in soils and the need to consider the role of microplastics in better risk assessment and remediation of Rox(V)-contaminated soils.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 30
·4439-4446
·
IF 1.9
Ping Zhang,Qian Yu,Yuhan He,Wentao Zhu,Zhiqiang Zhou,Lin He
The enantiomeric separation of fenpropathrin enantiomers on Lux Cellulose-1, Lux Cellulose-3 and Chiralpak IC chiral columns as well as enantioselective degradation of fenpropathrin in soil were investigated by reverse-phase high-performance liquid chromatography (RP-HPLC). The effects of the chiral stationary phase, mobile phase component, mobile phase ratio, temperature and thermodynamic parameters on resolution were carefully evaluated. Fenpropathrin enantiomers achieve a baseline separation (Rs = 2.30) on the Lux Cellulose-3 column with a mobile phase of methanol/water at a ratio of 85/15. Partial separations were achieved on Lux Cellulose-1 and Chiralpak IC columns with maximum Rs = 1.01 and Rs = 0.64, respectively. Enantioselective degradation of fenpropathrin enantiomers in soil was investigated based on the proposed separation method. The half-life (t1/2) of S-fenpropathrin and R-fenpropathrin was 17.8 days and 12.6 days, respectively, indicating that the degradation of fenpropathrin in soil was enantioselective, with R-fenpropathrin preferentially degraded. Furthermore, the formation and degradation of 3-PBA, the main metabolite of fenpropathrin, were also investigated in three soils. Soil microorganisms were confirmed as the main factor that is responsible for enantioselective degradation of fenpropathrin enantiomers in soil. Such results provide a new approach for fenpropathrin enantiomer separation and contribute to a comprehensive risk assessment of fenpropathrin at the enantiomer level.
研究领域:
环境科学
·
农药化学
·
微生物学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 8
·1699
·
IF 4.2
Yue Liu,Long Cao,Linshan Wang,Yanjiao Qi,Yamin Zhao,Huining Lu,Lina Lu,Derong Zhang,Zifan Wang,Hong Zhang
The massive amount of water-soluble urea used leads to nutrient loss and environmental pollution in both water and soil. The aim of this study was to develop a novel lignin-based slow-release envelope material that has essential nitrogen and sulfur elements for plants. After the amination reaction with a hydrolysate of yak hair keratin, the coating formulation was obtained by adding different loadings (2, 5, 8, 14 wt%) of aminated lignin (AL) to 5% polyvinyl alcohol (PVA) solution. These formulations were cast into films and characterized for their structure, thermal stability, and mechanical and physicochemical properties. The results showed that the PVA-AL (8%) formulation had good physical and chemical properties in terms of water absorption and mechanical properties, and it showed good degradation in soil with 51% weight loss after 45 days. It is suitable for use as a coating material for fertilizers. Through high-pressure spraying technology, enveloped urea particles with a PVA-AL (8%) solution were obtained, which showed good morphology and slow-release performance. Compared with urea, the highest urea release was only 96.4% after 30 days, conforming to Higuchi model, Ritger–Peppas model, and second-order dynamic model. The continuous nitrogen supply of PVA-AL coated urea toBrassica napuswas verified by potting experiments. Therefore, the lignin-based composite can be used as a coating material to produce a new slow-release nitrogen fertilizer for sustainable crop production.
研究领域:
农业科学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 10
·1-13
·
IF 3.097
He Jing,Yu Tao,Chen Shaokai,Li Yan
A new thermoset PLA resin was synthesized. The structure and performance of the thermoset PLA resin were characterized by Fourier transform infrared spectroscopy (FTIR), 1 H Nuclear Magnetic Resonance ( 1 H-NMR), 13 C Nuclear Magnetic Resonance ( 13 C-NMR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) testing methods. The results indicate that thermoset PLA resin has been synthesized successfully, and the thermal stability of thermoset PLA is better than that of linear PLA. Thermoset PLA resin and ramie/thermoset poly(lactic acid) (PLA) composites were prepared by casting and hot-pressing, respectively. The degradation behavior was evaluated by surface morphology observation, scanning electron microscope (SEM), pH detection and FTIR analysis. The results show that the thermoset PLA resin fully degrades after 20 days, and the degradation rate of ramie/thermoset PLA composites is only 45.27% after 30 days, which is lower than that of thermoset PLA. The reason is due to that ramie fabric as the barrier hinders the moisture and microorganisms enter the interior of the composites. Moreover, according to the FTIR analysis, the ester groups of thermoset PLA are firstly hydrolyzed, and thermoset PLA is decomposed into low molecular weight oligomers. Then thermoset PLA and oligomers are continuously hydrolyzed by moisture and microorganisms until mineralized into H 2 O and CO 2 . Besides, the soil pH value detection proves that no acidic or alkaline harmful degradation products are produced during the soil degradation process.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 10
·8887
·
IF 5.6
Haoxiang Zhu,Kunrong Qin,Ping Zhang,Haiyang Wang
The separation of benoxacor enantiomers on six commercial chiral columns was investigated by high-performance liquid chromatography (HPLC) under normal-phase and reversed-phase conditions. The mobile phases included hexane/ethanol, hexane/isopropanol, acetonitrile/water, and methanol/water. The effects of the chiral stationary phases (CSPs), temperature, and mobile phase composition and ratio on the separation of benoxacor enantiomers were examined. Under normal-phase conditions, the two benoxacor enantiomers were completely separated on Chiralpak AD, Chiralpak IC, Lux Cellulose-1, and Lux Cellulose-3 columns and partially separated on a Lux Cellulose-2 column. Under reversed-phase conditions, benoxacor enantiomers were completely separated on a Lux Cellulose-3 column and partially separated on Chiralpak IC and Lux Cellulose-1 columns. Normal-phase HPLC performed better than reversed-phase HPLC for the separation of benoxacor enantiomers. As the column temperature increased from 10 °C to 4 °C, the enthalpy (ΔH) and entropy (ΔS) results indicated that the resolution was strongly affected by the temperature and that the lowest temperature did not always produce the best resolution. An optimized separation method on the Lux Cellulose-3 column was used to investigate the stability of benoxacor enantiomers in solvents and the degradation of benoxacor enantiomers in three types of horticultural soil. Benoxacor enantiomers were stable, and degradation or racemization were not observed in methanol, ethanol, isopropanol, acetonitrile, hexane, or water (pH = 4.0, 7.0, and 9.0). In three horticultural soils, the degradation rate of S-benoxacor was faster than that of R-benoxacor, resulting in soil enrichment with R-benoxacor. The results of this study will help to improve the risk assessment of enantiomer levels of benoxacor in the environment.Keywords:benoxacor;chiral separation;enantiomers;enantioselectivity;soil degradation
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Boyou Hou,Yinan Sun,Yanlin Guo,Wei Zhang,Xueying Shan,Qianqian Cui,Zhendong Chen,Qingting Ni,Jinchun Li
Developing bio-based plasticizers not only aids in the reduction of fossil fuel consumption but also presents a lower risk to human health. In this study, a fully biodegradable plasticizer—levulinate malate ethanol lactates (LMEL) was successfully synthesized from L-lactic acid, DL-malic acid, levulinic acid, and ethanol, and was compared with commercially plasticizers (acetyl tributyl citrate (ATBC), dioctyl phthalate (DOP) and di-2-ethylhexyl terephthalate (DOTP)). 40 phr LMEL plasticized polyvinyl chloride (PVC) (40LMEL) yielded a remarkable elongation at break of 526.9%, compared with the pure PVC resin (4.5%), thereby significantly enhancing the flexibility of PVC. Moreover, the optical transparency of 40LMEL samples was found to be equivalent to PVC plasticized with three commercial plasticizers. Most importantly, compared with three commercial plasticizers, 40LMEL exhibited superior resistance to migration and volatility, with mass losses of 1.055% in H 2 O, 13.601% in n-hexane, 14.636% in ethanol, and 1.496% in activated carbon, respectively. Soil degradation experiments have demonstrated that LMEL can be broken down by microorganisms in the soil into nontoxic aliphatic compounds (e.g., 4-oxo-pentanoic acid, and 4,5,7-trihydroxy 2-octenoic acid, et al.). Collectively, LMEL exhibited better overall performance than three commercial plasticizers. This work provides new options for the design of efficient fully bio-based plasticizers.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 104
·期 1
·149-155
·
IF 1.65
Xie Yan-Li,Jiang Wayne,Li Fen,Zhang Yu,Liang Xiao-Yu,Wang Meng,Zhou Xueqing,Wu Shao-Ying,Zhang Cheng-Hui
This study was intended to develop an environment-friendly controlled release system for spirotetramat in an alginate matrix. Four formulations, starch–chitosan–calcium alginate (SCCA), starch–calcium alginate (SCA), chitosan–calcium alginate (CCA), and calcium alginate (CA) complex gel beads, were prepared by the extrusion–exogenous gelation method. The properties of the formulations were studied. The results showed that the release behaviors of the formulations in water could be well described by the logistic model, and the release occurred through Fickian diffusion. Among the four formulations, SCCA showed the highest entrapment efficiency, drug loading and the slowest release rate. Degradation studies revealed that the SCCA formulation exhibited an obvious slower degradation rate of spirotetramat in soils than the commercially available formulation. The estimated half-life of the SCCA formulation was 2.31, 3.25, and 4.51 days in waterloggogenic paddy soil, purplish soil, and montmorillonite, respectively, when the soils were moistened to 60% of its dry weight. This study provided a possible approach to prolong the duration of spirotetramat and to reduce environmental contamination.
研究领域:
农药科学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Ziyue Li,Xiaolei Wang,Fei Peng,Ning Chen,Guodong Fang
The use of peracetic acid (PAA) in advanced oxidation processes has gained significant attention recently, but the knowledge of activating PAA to degrade polycyclic aromatic hydrocarbons (PAHs) is limited due to the variety and selectivity of reactive substances in PAA oxidation system. This paper presented the first systemically study on the degradation of PAHs by PAA activation in soil. It was found that heat-activated peracetic acid (heat/PAA) was capable of degrading phenanthrene (PHE) efficiently with degradation efficiency > 90 % within 30 min. Experimental results demonstrated that a series of reactive oxygen species (ROS) including organic radicals (RO • ), hydroxyl radicals (HO • ) and singlet oxygen ( 1 O 2 ) were generated, while acetylperoxyl (CH 3 C(O)OO • ) and acetyloxyl (CH 3 C(O)O • ) radicals were primarily responsible for PHE degradation in soil. Further analysis shows that polymerization products such as diphenic acid , 2′-formyl-2-biphenylcarboxylic acid and other macromolecules were dominant products of PHE degradation, suggesting polymerization driving PHE degradation instead of the conventional mineralization process. Toxicity analysis shows that most of the polymerization products had less toxicity than that of PHE. These results indicate that PAA activation was a highly effective remediation method for PAHs contaminated soil, which also provided a novel mechanism for pollutant degradation with the PAA activation process for environmental remediation.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 6
·6209-6215
·
IF 2.914
Shi Hui,Bai Cuihua,Luo Donglin,Wang Wei,Zhou Changmin,Meharg Andrew A.,Yao Lixian
The environmental and human health risk posed by veterinary antibiotics is of global concern. Antibiotic uptake by herbal plants has been studied, but little is known about perennial woody fruit crops. Litchi ( Litchi chinensis Sonn.), a longevial fruit tree, is routinely fertilized with animal manure and, therefore, may be at risk of antibiotic uptake into its fruits. This study investigated the degradation of chlortetracycline and doxycycline present in manure used to amend orchard soil, and their subsequent assimilation by litchi plant, as affected by manure application rate. The results show that half-lives of chlortetracycline and doxycycline in soil were decreased by increased manure rate, with an average of 27 and 59 days, respectively. Chlortetracycline was readily transported to litchi shoots and increased with the growth of litchi plants. Doxycycline predominantly remained in the roots, and underwent growth dilution in the plants. The two tetracyclines could not be detected in fruits from litchi trees when applied with manures, at various rates, over 2 years. For litchi, chlortetracycline may pose human health risk through manure application, but doxycycline is unlikely to do so. Long-term field experiments are required to monitor antibiotic accumulation in fruits of perennial fruit trees fertilized with animal manure.
研究领域:
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Xiaona Dong,Ruonan Feng,Yuanming Jiang,Tianming Cai,Canlan Jiang
Soil contamination by triphenyl phosphate (TPHP) has posed a potential threat to human health. In this study, the degradation of TPHP by different chemical oxidation methods, including H 2 O 2 , persulfate (PS), peroxymonosulfate (PMS), ferrous ions (Fe 2+ ) activated H 2 O 2 , Fe 2+ activated PS, heat activated PS (heat-PS), and heat activated PMS, was compared. Heat input could promote the activation of PS to generate highly reactive species (HRS) and the aqueous availability of TPHP for more efficient degradation of TPHP in soil than other methods. As reaction temperature rose to melting point of TPHP (50 o C), the degradation rate sharply increased. The activation energy ( Ea ) of TPHP degradation in soil was caculated to be 115.57 kJ mol -1 . The oxidation capacity per unit PS was about 22.0 M -1 . Sulfate radicals (SO 4 •− ) and hydroxyl radicals (•OH) were the major HRS for TPHP degradation in heat-PS system. With increasing of soil-water ratio, the inhibitory effect of soil organic matter (SOM) on TPHP degradation was significantly enhanced. The degradation efficiency was highest under weakly acidic conditions (pH ≈ 4.8). Cl − significantly inhibited the degradation of TPHP in heat-PS system, while HCO 3 − and H 2 PO 4 − had little effects on the degradation of TPHP. After reaction, TPHP in soil could be degraded to be less toxic para -hydroxy triphenyl phosphate ( p -OH-TPHP), diphenyl phosphate (DPHP), and phosphate ions (PO 4 3− ). This study discloses a sustainable strategy for the remediation of OPFRs-contaminated soil by utilizing heat-PS method.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 16
·10415-10424
·
IF 5.044
Huang Da,Li Dong,Mo Kangwei,Xu Rui,Huang Yanan,Cui Yande,Zhang Qunchao,Chang Chunyu
Owing to non-degradable waste plastics causing serious environmental pollution, the development of natural polymeric materials has become an important topic. Herein, multilayer tunicate cellulose films (MTCFs) were fabricated by a top-down approach, where the alkali treated mantles of tunicate were layer-by-layer hot-pressed. Strong hydrogen bonds that formed between tunicate cellulose layers resulted in good interfacial compatibility of multilayer films. The as-prepared MTCFs exhibited improved thermal stabilities, excellent mechanical properties, and good degradability in natural soil. This work provided a top-down approach for the preparation of biodegradable multilayer films as packaging materials.
研究领域:
材料科学
·
环境科学
·
生物技术
✓ 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）