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The Practice of Prescribing Antidepressants During Pregnancy and Breastfeeding Among Mental Health Practitioners in Tertiary Care Centers in Oman. 阿曼三级医疗中心的精神卫生从业人员在孕期和哺乳期开具抗抑郁药处方的做法。
4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-11-30 eCollection Date: 2023-11-01 DOI: 10.5001/omj.2023.123
Salim Al Kasbi, Yousif Obaid, Samir Al Adawi, Sanjay Jaju

Objectives: This study sought to determine the confidence level of mental health practitioners in Oman regarding the use of antidepressants during pregnancy and breastfeeding, assess their knowledge and need for further training in this area, and examine their current prescribing patterns and preferences.

Methods: A questionnaire-based survey was conducted from May to June 2017 among all practitioners in the psychiatry specialty, including medical officers authorized to prescribe medications, at the Behavioral Medicine Department of Sultan Qaboos University Hospital and Al Masarra Hospital.

Results: Forty-two practitioners (response rate = 89.4%) responded to the questionnaire. Of them, 10 (23.8%) had no experience, while 30 (71.4%) had experience in prescribing antidepressants during both pregnancy and breastfeeding periods. Twenty-seven (64.3%) respondents felt that they were confident in prescribing antidepressants for women during their perinatal period, while 30.0% were neutral. Moreover, 35 (83.3%) participants expressed the need for more training in this area. Furthermore, 34 (81.0%) believed that more training in perinatal psychiatry should be included in the psychiatry curriculum. There was no consistent prescribing pattern (either prescribing or avoiding) among our participating practitioners during the first trimester of pregnancy and breastfeeding periods. The drug of choice in the first trimester of pregnancy was fluoxetine preferred by approximately 85.0% of the practitioners, but avoided by 10.0% of practitioners in the same period. This was followed by amitriptyline (50.0% vs. 23.0%), sertraline (50.0% vs. 9.0%), imipramine (28.0% vs. 84.0%). During breastfeeding, the drug of choice for approximately 74.0% of the practitioners was paroxetine, but avoided by 15.0% of practitioners. This was followed by sertraline (50.0% vs. 8.0%). The most common reasons for prescription during pregnancy were safety, evidence-based practice, and low teratogenicity. For breastfeeding, the main reasons for prescription were low levels of the drug in breast milk, safety, and evidence-based practice. On the other hand, high teratogenicity, neonatal side effects, limited data, and lack of evidence were among the most common reasons behind avoiding prescribing during pregnancy, while high levels of breast milk, neonatal side effects, limited evidence, and safety concerns were the most common reasons during the breastfeeding period.

Conclusions: There was inconsistency among mental health practitioners in making prescription decisions and in their prescribing patterns.

研究目的本研究旨在确定阿曼精神卫生从业人员对孕期和哺乳期使用抗抑郁药物的信心水平,评估他们在这方面的知识和进一步培训的需求,并研究他们目前的处方模式和偏好:2017年5月至6月,对苏丹卡布斯大学医院行为医学科和Al Masarra医院精神科的所有从业人员(包括有权开具处方的医务人员)进行了问卷调查:42名医生(回复率=89.4%)回复了问卷。其中,10 人(23.8%)没有任何经验,30 人(71.4%)有在孕期和哺乳期开具抗抑郁药处方的经验。27名受访者(64.3%)认为自己有信心为围产期妇女开具抗抑郁药处方,30.0%的受访者持中立态度。此外,35 名(83.3%)受访者表示需要在这方面接受更多培训。此外,34 人(81.0%)认为应在精神病学课程中增加围产期精神病学方面的培训。在怀孕头三个月和母乳喂养期间,参与调查的医生没有一致的处方模式(处方或避免处方)。约 85.0%的医生在怀孕头三个月首选氟西汀,但同期有 10.0%的医生避免使用该药。其次是阿米替林(50.0% 对 23.0%)、舍曲林(50.0% 对 9.0%)和丙咪嗪(28.0% 对 84.0%)。在母乳喂养期间,约 74.0%的从业人员首选帕罗西汀,但有 15.0%的从业人员避免使用。其次是舍曲林(50.0% 对 8.0%)。孕期处方最常见的原因是安全性、循证实践和低致畸性。对于母乳喂养,处方的主要原因是母乳中药物含量低、安全性和循证实践。另一方面,高致畸性、新生儿副作用、数据有限和缺乏证据是孕期避免处方的最常见原因,而母乳中药物含量高、新生儿副作用、证据有限和安全问题则是哺乳期最常见的原因:结论:精神卫生从业人员在做出处方决定和处方模式方面存在不一致性。
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引用次数: 0
Outcomes after curatively intended treatment of limited peritoneal metastases and thermal ablation for liver metastases from colorectal cancer. 结直肠癌局限性腹膜转移和肝转移热消融治疗后的疗效。
IF 1.8 4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-07-24 eCollection Date: 2023-12-01 DOI: 10.1515/pp-2023-0015
Rogini Balachandran, Mette Møller Sørensen, Jonas Amstrup Funder, Anders Riegels Knudsen, Lene Hjerrild Iversen

Objectives: Peritoneal metastases (PM) and liver metastases (LM) are present simultaneously in up to 2 % of patients at the time of their colorectal cancer (CRC) diagnosis. Curatively intended treatment includes cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC) combined with LM resection. A less invasive treatment for LM is ablation. We aimed to estimate overall survival (OS), disease-free survival (DFS) and postoperative data in patients managed simultaneously with CRS, HIPEC and radiofrequency ablation (RFA) as first choice.

Methods: This was a retrospective national cohort study. All patients were treated at Aarhus University Hospital; the only CRS+HIPEC centre in Denmark. We included CRC patients managed with curative intent for simultaneously diagnosed PM and LM in the period January 2016 - December 2021. LM was treated with RFA as first choice, if possible. Survival was calculated by the Kaplan-Meier method.

Results: A total of 25 patients were included, the median age was 60 years (range 43-75 years) and 15 (60 %) were females. The median peritoneal cancer index was 7 (range 0-12), the median number of LM was 1 (range 1-3). Ablation was performed as the only treatment for LM in 18 (72 %) patients. After a median follow-up time of 17.1 months (range 4-36 months), the median OS was 28.6 months (95 % confidence interval (Cl) 15.8;36.1), 1-year OS was 84.0 % (95 % Cl 62.8;93.7). Median DFS was 6.1 months (95 % Cl 4.0;10.3). Median LOS was ten days (range 5-26 days). Both 30-day and 90-day mortality were 0 %.

Conclusions: The selected treatment modality (RFA) for CRC patients with both LM and PM was safe. However, DFS was low. Further research is warranted to investigate if RFA is as effective as LM resection.

目的:多达 2% 的患者在确诊结直肠癌(CRC)时同时存在腹膜转移灶(PM)和肝转移灶(LM)。根治性治疗包括囊肿切除手术(CRS)和腹腔内热化疗(HIPEC),并结合肝转移灶切除术。LM的微创治疗是消融术。我们的目的是估算同时接受CRS、HIPEC和射频消融术(RFA)作为首选治疗的患者的总生存期(OS)、无病生存期(DFS)和术后数据:这是一项回顾性全国队列研究。所有患者均在奥胡斯大学医院接受治疗,该医院是丹麦唯一一家CRS+HIPEC中心。我们纳入了2016年1月至2021年12月期间因同时确诊PM和LM而接受治愈性治疗的CRC患者。如果可能,LM首选RFA治疗。采用卡普兰-梅尔法计算生存率:共纳入25名患者,中位年龄为60岁(43-75岁),女性15人(60%)。腹膜癌指数中位数为 7(范围 0-12),LM 中位数为 1(范围 1-3)。18例(72%)患者的腹膜癌只接受了消融治疗。中位随访时间为17.1个月(4-36个月),中位OS为28.6个月(95%置信区间(Cl)为15.8;36.1),1年OS为84.0%(95%置信区间(Cl)为62.8;93.7)。中位 DFS 为 6.1 个月(95 % 置信区间为 4.0;10.3)。中位 LOS 为 10 天(5-26 天不等)。30天和90天死亡率均为0%:结论:对于同时患有LM和PM的CRC患者,所选的治疗方式(RFA)是安全的。然而,DFS较低。有必要进一步研究 RFA 是否与 LM 切除术一样有效。
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引用次数: 0
Structure and thermal stability of phosphochlorinated polybutadiene/carbon black composite synthesized via oxidative chlorophosphorylation reaction 氧化氯化反应合成的聚丁二烯/炭黑复合材料的结构和热稳定性
4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.2298/jsc230731080e
Nada Edres, Irada Buniyat-Zadeh, Solmaz Aliyeva, Sinan Turp, Rasim Alosmanov
The aim of the presented work was to obtain a new type of homogeneous composite based on an industrial polymer (polybutadiene, PB) and a well-known inexpensive filler (carbon black P-234, CB). For this purpose, the reaction of oxidative chlorophosphorylation (OxCh) was used. This makes it possible to introduce CB into the cross-linked structure of the modified polymer and ensure optimal distribution of the filler in it. The structure and thermal stability of the composite synthesized by the OxCh reaction were studied. Analysis of the composite by Fourier-transform infrared spectroscopy indicates a uniform distribution of carbon black in the network structure of the matrix and the physical interaction of the phases of the composite. Ultraviolet-visible spectrum data confirmed the improvement in light absorption in a wide range of the electromagnetic spectrum and the decrease in the optical band gap energy of the phosphochlorinated PB (PhPB) matrix with the addition of CB (Eg of PhPB=3.25 eV; Eg of PhPB/CB composite=2.28 eV). The influence of CB on the thermal stability of the PhPB matrix was studied using thermogravimetric and differential thermogravimetric analysis. After thermal analysis, the char yield for PhPB was 41 wt%, and for PhPB/CB composite was 35.2 wt%. Compared to PhPB, the increase in char yield, the decrease in maximum thermal decomposition temperature, and the high-integrated thermal decomposition temperature for the PhPB/CB composite show the improvement in the thermal stability of PhPB due to CB.
本文的目的是制备一种新型的均相复合材料,该复合材料是基于工业聚合物(聚丁二烯,PB)和一种众所周知的廉价填料(炭黑P-234, CB)。为此,采用了氧化氯磷酸化(OxCh)反应。这使得将CB引入到改性聚合物的交联结构中并确保填料在其中的最佳分布成为可能。研究了氧化羰基反应合成的复合材料的结构和热稳定性。傅里叶红外光谱分析表明,炭黑在基体的网状结构中分布均匀,复合材料的相之间存在物理相互作用。紫外可见光谱数据证实,加入CB后,磷氯化PB (PhPB)基体在较宽的电磁波谱范围内的光吸收得到改善,光学带隙能降低(PhPB的Eg =3.25 eV;PhPB/CB复合材料Eg =2.28 eV)。采用热重法和差热重法研究了炭黑对PhPB基体热稳定性的影响。经热分析,PhPB炭产率为41 wt%, PhPB/CB复合炭产率为35.2%。与PhPB相比,PhPB/CB复合材料炭产率的提高、最大热分解温度的降低和热分解温度的高积分表明,CB的加入改善了PhPB的热稳定性。
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引用次数: 0
A DFT study of the chemical bonding properties, aromaticity indexes and molecular docking study of some phenylureas herbicides 苯脲类除草剂化学键性质、芳香性指标及分子对接的DFT研究
4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.2298/jsc230712085l
Souhila Laib, Saad Bouchekioua, Rafik Menacer
Herbicides have implied disastrous consequences towards the environment and human health. This practice urges scientists to investigate the physical, chemical and biological properties of these substances, hence avoiding the use of the most harmful pesticides. For this purpose, the molecular structure and chemical bonding properties of phenylurea herbicides namely: Fenuron (L1), Monuron (L2), Diuron (L3) and Chlorotoluron (L4), were calculated in water using density functional theory (DFT). The energy decomposition analysis (EDA) and the extended transition state natural orbitals for chemical Valence (ETS-NOCV) reveal the dominant ionic character in Carbon-Nitrogen bond between dimethylurea fragment and benzene ring. Besides, the interaction of these herbicides with the Human Serum Albumin (HSA) was undertaken by molecular modeling. The calculation of HOMA and FLU indexes indicate that the electronic delocalization is stronger in Diuron than the other compounds, mainly caused by the two chloro substituents effects on benzene. Good correlations are found between the calculated parameters such as structural parameters, Mulliken atomic charge, topological and bonding properties and aromaticity indexes. The Vinardo molecular docking results suggest that, the binding energies of the complexes formed between HSA target and investigated compounds have the following order: L3 (-27.57 kJ/mol) < L2 (-25.56 kJ/mol) < L4 (-24.94 kJ/mol) < L1 (-24.10 kJ/mol), which confirmed that the Fenuron is the less harmful option between the studied herbicides especially against HSA.
除草剂对环境和人类健康造成了灾难性的后果。这种做法促使科学家调查这些物质的物理、化学和生物特性,从而避免使用最有害的杀虫剂。为此,利用密度泛函理论(DFT)计算了苯脲类除草剂Fenuron (L1)、Monuron (L2)、Diuron (L3)和Chlorotoluron (L4)在水中的分子结构和化学键性质。能量分解分析(EDA)和化学价态扩展过渡态自然轨道(ETS-NOCV)揭示了二甲基脲片段与苯环之间碳氮键的主要离子特征。此外,通过分子模型研究了这些除草剂与人血清白蛋白(HSA)的相互作用。HOMA和FLU指数的计算表明,Diuron的电子离域比其他化合物更强,这主要是由于两个氯取代基对苯的影响。计算得到的结构参数、Mulliken原子电荷、拓扑和键合性能以及芳香性指标之间存在良好的相关性。Vinardo分子对接结果表明,HSA靶物与所研究化合物之间形成的配合物的结合能顺序为:L3 (-27.57 kJ/mol) <L2 (-25.56 kJ/mol) <L4 (-24.94 kJ/mol) <L1 (-24.10 kJ/mol),证实了吡脲是所研究除草剂中危害较小的选择,特别是对HSA。
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引用次数: 0
Iron(III) complexes with ditopic macrocycles bearing crown-ether and bis(salicylidene) isothiosemicarbazide moieties 含冠醚和双(水杨基)异硫代氨基脲的双位大环铁配合物
4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.2298/jsc230607065a
Vladimir Arion, Oleg Palamarciuc, Sergiu Shova, Ghenadie Novitchi, Peter Rapta
The main aims of this work were the synthesis and characterization of iron(III) complexes with with a ditopic ligand H2L consisting of a bis(salicylidene)isothiosemicarbazide moiety with a N2O2 binding site and a crown-ether (O6) moiety. A series of high-spin iron(III) complexes, i.e. [FeIIILClBa(CH3OH)(H2O)0.5(ZnCl4)] (1), [FeIIILCl] (2), [FeIIIL(N3)] (3) and [(FeIIIL)2O] (4), were synthesized. The complexes were characterized by mass spectrometry, IR and UV-vis spectroscopy, variable temperature (VT) magnetic susceptibility measurements, M?ssbauer spectroscopy, single crystal X-ray diffraction and cyclic voltammetry.
本工作的主要目的是合成和表征铁(III)配合物与双位配体H2L,该配体由具有N2O2结合位点的双(水杨基)异硫代氨基脲和冠醚(O6)部分组成。合成了一系列高自旋铁(III)配合物[FeIIILClBa(CH3OH)(H2O)0.5(ZnCl4)](1)、[FeIIILCl](2)、[feiiiln3)](3)和[(feiiil2o)](4)。采用质谱、红外光谱、紫外-可见光谱、变温磁化率、M?斯堡尔光谱,单晶x射线衍射和循环伏安法。
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引用次数: 0
Oxidation of 1,5-benzodiazepine oximes catalysed by peroxidases 过氧化物酶催化1,5-苯二氮卓类肟的氧化
4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.2298/jsc230520068k
Lidija Kosychova, Lina Rekovic, Irina Bratkovskaja, Ingrida Radveikiene, Regina Vidziūnaitė
Oxidation of 1,3,4,5-tetrahydro-2H-1,5-benzodiazepine oximes catalysed by horseradish peroxidase (HRP) and recombinant Coprinus cinereus peroxidase (rCiP) was studied spectrophotometrically. The reaction rate dependences on the substrate and hydrogen peroxide concentrations were investigated; the values of apparent KM and Vmax, catalytic, oxidation and reduction constants (kcat, kox and kred, respectively) were calculated. The reactivity constants for the reactions catalysed by rCiP were higher than those for the HRP. Since oximes can have different structures depending on pH, the influence of pH on the rate of oxidation of compounds was studied. The dependences of the oxidation rate of the investigated oximes on the pH of the buffer solution were determined, and the pKa values of the amino acids of peroxidases responsible for the rate of catalysis were obtained. The HRP activity dependence on pH has a classical bell-shaped character, while rCiP dependence has a complex character.
用分光光度法研究了辣根过氧化物酶(HRP)和重组鸡鸡过氧化物酶(rCiP)催化1,3,4,5-四氢- 2h -1,5-苯二氮卓类肟的氧化反应。考察了底物和过氧化氢浓度对反应速率的影响;计算表观KM和Vmax、催化常数、氧化常数和还原常数(kcat、kox和kred)。rCiP催化的反应活性常数高于HRP。由于氧肟在不同的pH值下具有不同的结构,因此研究了pH值对化合物氧化速率的影响。测定了所研究的肟类化合物的氧化速率与缓冲溶液pH的关系,得到了催化速率的过氧化物酶氨基酸的pKa值。HRP活性对pH值的依赖具有经典的钟形特征,而对rCiP的依赖具有复杂的特征。
{"title":"Oxidation of 1,5-benzodiazepine oximes catalysed by peroxidases","authors":"Lidija Kosychova, Lina Rekovic, Irina Bratkovskaja, Ingrida Radveikiene, Regina Vidziūnaitė","doi":"10.2298/jsc230520068k","DOIUrl":"https://doi.org/10.2298/jsc230520068k","url":null,"abstract":"Oxidation of 1,3,4,5-tetrahydro-2H-1,5-benzodiazepine oximes catalysed by horseradish peroxidase (HRP) and recombinant Coprinus cinereus peroxidase (rCiP) was studied spectrophotometrically. The reaction rate dependences on the substrate and hydrogen peroxide concentrations were investigated; the values of apparent KM and Vmax, catalytic, oxidation and reduction constants (kcat, kox and kred, respectively) were calculated. The reactivity constants for the reactions catalysed by rCiP were higher than those for the HRP. Since oximes can have different structures depending on pH, the influence of pH on the rate of oxidation of compounds was studied. The dependences of the oxidation rate of the investigated oximes on the pH of the buffer solution were determined, and the pKa values of the amino acids of peroxidases responsible for the rate of catalysis were obtained. The HRP activity dependence on pH has a classical bell-shaped character, while rCiP dependence has a complex character.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135595758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploring the properties of uranyl nicotinate: Synthesis, characterization, and thermal analysis 探索烟酸铀酰的性质:合成、表征和热分析
4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.2298/jsc230817071a
Assis de, Carvalho de, Colman Denck
This study reports the successful synthesis and characterization of a uranyl nicotinate compound, UO2(C6H4NO2)2?0.25H2O. The compound was synthesized using a Metal 1:2 Ligand ratio and water as the solvent. The average yield of the compound was found to be 67%. Thermogravimetric analysis revealed multiple stages of mass loss, including dehydration, nitrogen decomposition, and UO22+ reduction. Fourier-transform infrared spectroscopy confirmed the coordination of the carboxylate group in the compound. Field emission gun scanning electron microscope analysis showed particles with a regular oval shape. Energy-dispersive X-ray spectroscopy provided semi-quantitative data on the elemental composition of the compound. The major elements identified were uranium, carbon, oxygen, and nitrogen. These results contribute to understanding the compound's synthesis, thermal behavior, molecular composition, particle morphology, and elemental composition. Further research can build upon these findings to explore potential applications and develop new compounds with tailored properties
本文报道了一种铀酰烟酸化合物UO2(C6H4NO2)2?0.25H2O的成功合成和表征。以金属1:2的配体比和水为溶剂合成了该化合物。该化合物的平均收率为67%。热重分析揭示了质量损失的多个阶段,包括脱水、氮分解和UO22+还原。傅里叶变换红外光谱证实了化合物中羧酸基的配位。场发射枪扫描电镜分析显示颗粒呈规则的椭圆形。能量色散x射线光谱提供了化合物元素组成的半定量数据。确定的主要元素是铀、碳、氧和氮。这些结果有助于了解化合物的合成、热行为、分子组成、颗粒形态和元素组成。进一步的研究可以建立在这些发现的基础上,探索潜在的应用和开发具有定制特性的新化合物
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引用次数: 0
Utilization of Jamun seed (Syzyum Cumini) biochar for removal of Fuchsin dye from aqueous solution 利用Jamun种子(Syzyum Cumini)生物炭去除水溶液中的品红染料
IF 1 4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.2298/jsc220830021k
Divya Kosale, C. Thakur, Vinod Singh
The textile, leather, paint and other industries discharge lots of dyes in their effluent which can cause major impact to environment and human life. Therefore, it becomes necessary to eliminate the dye from the effluent before its discharge and reuse. Several procedures for the removal and inactivation of dyes have been proposed over past but the adsorption has gained popularity due to its efficiency and operational ease. Use of the biochars as an adsorbent is gaining attention due to their low cost, availability and high adsorption capability. The current study focuses on the removal of Basic Fuchsin (BF) dye through adsorption using Jamun (Syzyum Cumini) seed powder biochar as an adsorbent. The biochar was characterized through various analyses such as: XRD, EDS, FTIR, TGA and SEM. Adsorption was studied by varying the parameters such as pH, contact duration, temperature, adsorbent dose, and temperature. Further, the isotherm, kinetic, and thermodynamic studies were also performed to understand the adsorption mechanism. The maximum adsorption capacity for BF dye was found with Jamun seed biochar produced at 500?C. The study reveals that the biochar manufactured from Jamun seed power has significant potential for elimination of BF dye from wastewater.
纺织、皮革、涂料等行业排放大量染料,对环境和人类生活造成严重影响。因此,有必要在废水排放和再利用之前将染料从废水中去除。过去已经提出了几种去除和失活染料的方法,但吸附法因其高效和易于操作而受到欢迎。生物炭作为吸附剂因其成本低、可用性好、吸附能力强等优点而受到广泛关注。本文主要研究了以Jamun (Syzyum Cumini)种子粉生物炭为吸附剂,吸附去除碱性品红(BF)染料。通过XRD、EDS、FTIR、TGA、SEM等多种分析手段对生物炭进行了表征。通过改变pH、接触时间、温度、吸附剂剂量和温度等参数来研究吸附。此外,还进行了等温线、动力学和热力学研究,以了解吸附机理。在500℃条件下生产的Jamun种子生物炭对BF染料的吸附量最大。该研究表明,以蚕豆籽粉为原料制备的生物炭具有显著的去除废水中BF染料的潜力。
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引用次数: 0
Synthesis of sodium silicate crystals from rice husk ash 稻壳灰合成水玻璃晶体
IF 1 4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.2298/jsc221126040e
S. Emmanuel, A. Sallau, O. Adedirin, H. Ibrahim, M. Buga, Anthony Okereke, G. Ozonyia, Fortune Alabi
The rich husk is an agricultural waste of rice cultivation worldwide, which is highly rich in amorphous silica. Rice husk obtained from Dagiri was pyrolysed at 750 ? to give white ash (RHA) which was further treated with acid (ARHA). The ash was reacted with sodium hydroxide at 90 ? for 2 hours 30 min to produce Sodium silicate crystals. Sodium silicates synthesized in the study were characterized with some physicochemical parameters. Their structural and morphological properties were assessed using a Fourier Transform Infra-red spectrophotometer (FTIR), X-ray Diffractometer (XRD) and Scanning Electrode Microscope (SEM). The mineralogical composition of the ash and sodium silicate was investigated with Energy-dispersive X-ray fluorescence (EDXRF) spectrometer. The sodium silicate produced has a melting point of 61 ?, a pH of 12.03 and appeared as brownish-white to clear-white in colour. The RHA and ARHA from XRD investigation showed patterns which match the mineral phase cristobalite, while that of the sodium silicate XRD patterns match the mineral heptahydrate disodiumtrioxosilicate as the most dominant phase. Rietveld refinement of the XRD pattern for the sodium silicate gave Rwp = 12.81, Rexp = 5.55, ?2 = 5.3274 and GoF = 2.3081 against a dual phase analysis. The sodium crystal-synthesized is suitable for use in cosmetic formulations.
稻壳是世界范围内水稻种植的农业废弃物,富含无定形二氧化硅。从Dagiri获得的稻壳在750 ?得到白灰(RHA),再用酸(ARHA)处理。灰与氢氧化钠在90度下反应?2小时30分钟生成硅酸钠晶体。用理化参数对合成的硅酸钠进行了表征。利用傅里叶变换红外分光光度计(FTIR)、x射线衍射仪(XRD)和扫描电极显微镜(SEM)对其结构和形态进行了表征。用能量色散x射线荧光(EDXRF)光谱仪研究了灰分和水玻璃的矿物组成。所制得的硅酸钠熔点为61°,pH值为12.03,呈棕白色至纯白色。XRD的RHA和ARHA图与方石英相相匹配,而水玻璃的XRD图与七水二钠三氧化硅酸相相匹配。对水玻璃的XRD谱图进行Rietveld细化,得到双相Rwp = 12.81, Rexp = 5.55, ?2 = 5.3274, GoF = 2.3081。所合成的钠晶体适用于化妆品配方。
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引用次数: 0
Use of aliphatic thiols for on-site derivatization and gas chromatographic identification of Adamsite 用脂肪族硫醇进行现场衍生化和气相色谱鉴定
IF 1 4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-01-01 DOI: 10.2298/jsc221207025r
T. Rozsypal
The report describes the development of methods for rapid and simple identification of Adamsite in mobile laboratory conditions using a field gas chromatograph coupled with mass spectrometer. Adamsite is a chemical warfare agent with unique properties that cannot be analyzed without conversion to a volatile derivative. Derivatization procedures with 5 aliphatic thiols (ethanethiol, 1-propanethiol, 2-propanethiol, 1-butanethiol and 1-hexanethiol) were developed and compared. The retention characteristics of the derivatization products, peak characteristics and the formation of unwanted artifacts in the chromatograms were monitored. The influence of the reaction media and the time dependence of the reaction were also objects of interest. Other investigated parameters were the optimal reaction temperature and the volume of the derivatization agent. Mass spectra of newly created substances that are not yet included in the chemical weapons related databases were recorded. With optimal reagents (1-butanethiol and 1-hexanethiol), calibration procedures for analyte determination were subsequently developed, and the methods were verified during the Adamsite identification test in selected environmental and urban matrices.
该报告描述了在移动实验室条件下使用现场气相色谱仪和质谱仪快速简便地鉴定Adamsite的方法的发展。Adamsite是一种具有独特性质的化学战剂,如果不转化为挥发性衍生物,就无法进行分析。研究了5种脂肪族硫醇(乙硫醇、1-丙硫醇、2-丙硫醇、1-丁硫醇和1-己硫醇)的衍生化过程,并进行了比较。对衍生化产物的保留特性、峰特性和谱图中伪影的形成进行了监测。反应介质的影响和反应的时间依赖性也是我们感兴趣的对象。其他研究参数为最佳反应温度和衍生化剂的体积。记录了尚未列入化学武器相关数据库的新创造物质的质谱。使用最佳试剂(1-丁硫醇和1-己硫醇),随后制定了分析物测定的校准程序,并在选定的环境和城市基质中进行了Adamsite鉴定试验。
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引用次数: 0
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Journal of The Serbian Chemical Society
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