Nigerian Journal of Chemical Research最新文献_第3页

Nanocomposites transformed from polystyrene waste/antimony, barium and nickel oxides nanoparticles with improved thermal and electrical properties 由聚苯乙烯废料/锑、钡和镍氧化物纳米颗粒转化而成的纳米复合材料，具有改善的热学和电学性能

Nigerian Journal of Chemical Research Pub Date : 2022-02-05 DOI: 10.4314/njcr.v26i2.7

Y. T. Sabo, D. Boryo, I. Chindo, A. Auwal

{"title":"Nanocomposites transformed from polystyrene waste/antimony, barium and nickel oxides nanoparticles with improved thermal and electrical properties","authors":"Y. T. Sabo, D. Boryo, I. Chindo, A. Auwal","doi":"10.4314/njcr.v26i2.7","DOIUrl":"https://doi.org/10.4314/njcr.v26i2.7","url":null,"abstract":"In this experiment, the oxide nanoparticles were synthesized via chemical precipitation and the nanocomposites were produced using in situ polymerization method with varying nanoparticles contents ranged from 0.1 g to 1.0 g for electrical conductivity and from 0.05 g to 0.25 g for thermal conductivity. The electrical and thermal conductivities of nanocomposites were investigated and compared with the values obtained for untreated polystyrene. It was observed that the electrical and thermal properties were higher for the nanocomposites and increase with increasing nanoparticle concentrations in the samples. It can be observed that nanocomposite containing NiO nanoparticles gave a better electrical and thermal conductivity followed by nanocomposite containing BaO nanoparticles and nanocomposite containing Sb2O3 nanoparticles respectively. It can also be observed that nanocomposite containing NiO nanoparticle showed increase in rate of heat transfer from 1.60 W to 2.60 W, while nanocomposite containing BaO nanoparticles recorded increase in rate of heat transfer from 1.40 W to 2.45 W and nanoomposite containing Sb2O3 nanoparticle showed increase in rate of heat transfer from 1.07 W to 2.21 W, as concentration of nanoparticles increased from 0.05 g to 0.25 g respectively. Conclusively, with these results, the nanocomposite containing NiO nanoparticles gave a better thermal and electrical conductivity by having a better conducting filler network inside the matrix than nanocomposite containing BaO nanoparticles and nanocomposite containing Sb2O3 nanoparticles. It is recommended that during the production of polymer nanocomposite, PS/NiO, PS/BaO and PS/Sb2O3 nanocomposites could be used in electrically conductive devices as well as suitable materials for heat transfer applications.","PeriodicalId":102130,"journal":{"name":"Nigerian Journal of Chemical Research","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128710941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Adsorption of cadmium ion from water using activated carbon produced from palm kernel shell 棕榈仁壳活性炭吸附水中镉离子的研究

Nigerian Journal of Chemical Research Pub Date : 2022-02-05 DOI: 10.4314/njcr.v26i2.6

O. Akintunde, F. C. Thomas, F. P. Egunleti

{"title":"Adsorption of cadmium ion from water using activated carbon produced from palm kernel shell","authors":"O. Akintunde, F. C. Thomas, F. P. Egunleti","doi":"10.4314/njcr.v26i2.6","DOIUrl":"https://doi.org/10.4314/njcr.v26i2.6","url":null,"abstract":"This study was carried out to evaluate the phytochemical, antioxidant potentials, and proximate composition of extracts of Citrullus lanatus rind (CLR) in different solvents. Chloroform, n-hexane, ethyl acetate, ethanol, and aqueous extracts of CLR were prepared after which they were subjected to phytochemical, antioxidants, and proximate analysis using standard methods. The ethanol and aqueous extracts of Citrullus lanatus rind were rich in alkaloids, saponins, and terpenoids, while the chloroform and ethanol extract were rich in flavonoids. It was observed that the ethyl acetate, chloroform and ethanol extracts of Citrullus lanatus rind had the highest concentration of total phenolic substances when compared with other extracts considered. The DPPH antioxidant scavenging activity was significantly higher in the ethyl acetate, hexane, and chloroform extracts. The aqueous extract Citrullus lanatus rind was richer in moisture content, but chloroform and hexane extracts were richer in calorie or carbohydrate a relatively high percentage of crude protein in the ethanol extract. With prescence of alkaloids, saponins, terpenoids, and phenolic compounds in ethanol and aqueous extracts of CLR. They may be beneficial in reducing cardiovascular diseases. Also, with improvement in quality of Citrullus lanatus rind, it may be of high medicinal value to man and livestock.","PeriodicalId":102130,"journal":{"name":"Nigerian Journal of Chemical Research","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125740431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two new oleanane-type glycosides from Napoleonaea imperialis P. Beauv RIND 两种新的齐墩烷型苷

Nigerian Journal of Chemical Research Pub Date : 2022-02-05 DOI: 10.4314/njcr.v26i2.4

G. Ndukwe, R. E. Ekong, I. Jack

引用次数: 1

Comparative extraction of essential oils of Mentha piperita (mint) by steam distillation and enfleurage 蒸汽蒸馏法和蒸馏法提取薄荷精油的比较研究

Nigerian Journal of Chemical Research Pub Date : 2022-02-05 DOI: 10.4314/njcr.v26i2.2

M. Ibrahim, G. Ankwai, J. R. Gungshik, P. Taave

{"title":"Comparative extraction of essential oils of Mentha piperita (mint) by steam distillation and enfleurage","authors":"M. Ibrahim, G. Ankwai, J. R. Gungshik, P. Taave","doi":"10.4314/njcr.v26i2.2","DOIUrl":"https://doi.org/10.4314/njcr.v26i2.2","url":null,"abstract":"The extraction of essential oils is generally carried out by two main techniques: azeotropic distillation (hydrodistillation, hydrodiffusion, and steam distillation) and extraction with solvents. This work consists in studying the two methods of extraction of the essential oils of Mentha piperita: Steam distillation (azeotropic) and Enfleurage (solvent extraction). The optimum yield for the extraction of essential oil via steam distillation from Mentha piperita was obtained at 540 minutes with production coming to an end at 1080 minutes yielding 1.36 % of essential oil at 80 0C per 240 g of sample while extraction through effleurage give maximum yield at 900 minutes with production coming to an end at 1080 minutes. The extraction process recorded a percentage yield of 0.91 % at 80 0C. In view of the above result, it implies that at a given condition the steam distillation method comparatively is a better technique for extraction of essential for optimal production. In addition, the compounds with the highest GC-MS area percentage in the analysis of Mentha piperitta were 1-Decanol, 2-hexyl- (3.8471%) and L-Menthol which also has a high area percentage (3.5439 %) which is of utmost importance as the fragrance of mint oil extract and its peculiar flavour can be attributed to the abundant presence of levo-menthol. Levo-menthol is used for the treatment, control, prevention, and improvement of the following diseases, conditions and symptoms which includes occasional minor irritation, Pain, Sore mouth, Sore throat and Cough. It can be drawn, without doubt, that steam distillation offers significant advantages comparatively over effleurage and can therefore be best suitable for pilot scale extraction of essential oils in Mint.","PeriodicalId":102130,"journal":{"name":"Nigerian Journal of Chemical Research","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134501582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Some aspects of the nutritional properties of the seed and raw seed oil of Hura crepitans 胡拉籽和生籽油的一些营养特性

Nigerian Journal of Chemical Research Pub Date : 2019-11-11 DOI: 10.4314/NJCR.V24I2

A. Udoh, I. Udousoro, I. Sunday

{"title":"Some aspects of the nutritional properties of the seed and raw seed oil of Hura crepitans","authors":"A. Udoh, I. Udousoro, I. Sunday","doi":"10.4314/NJCR.V24I2","DOIUrl":"https://doi.org/10.4314/NJCR.V24I2","url":null,"abstract":"Hura crepitans were studied in order to compliment information available in the literature and establish whether the oil can be used as edible oil, and the seed in food modifications and formulations. The seeds were collected along Nwaniba Road in Uyo Local Government Area of Akwa Ibom State, Nigeria. The oil was cold-extracted with n-hexane and used in the analysis of antinutrients and vitamins. The defatted seed flour was used in the determination of amino acids. The amino acids, vitamins and antinutrients were determined using standard methods. The results reveal that the antinutrients levels in the seed oil are relatively higher than their corresponding levels in conventional edible seed oils except phytate and oxalate. The oil is very rich in vitamin C compared to mustard and sunflower seed oils which are also edible oils. The seeds are richer in amino acids than the seeds of A. hypogaea, and E. guineensis which are conventionally used as food materials and their oils in cooking and frying. They are particularly rich in the essential amino acids except valine. The amino acids contents of the seeds compare reasonably (about 82%) with whole hen’s egg. Although H. crepitans seeds are rich in amino acids and the oil in vitamin C, the high tannins and cyanide levels in the seed oil would limit its use in nutrition. However, the seed flour can be beneficial in food fortification processes and animal feeds production.Keywords: Hura crepitans, Seed flour, Raw seed oil, Antinutrients, Vitamins, Amino acids, Essential amino acids","PeriodicalId":102130,"journal":{"name":"Nigerian Journal of Chemical Research","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114173787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Performance evaluation of graphite oxide in natural rubber compounds 氧化石墨在天然橡胶中的性能评价

Nigerian Journal of Chemical Research Pub Date : 2019-06-24 DOI: 10.4314/NJCR.V24I1

L. Ekebafe, G. Adebayo, M. Chukwu, K. O. Eguare

{"title":"Performance evaluation of graphite oxide in natural rubber compounds","authors":"L. Ekebafe, G. Adebayo, M. Chukwu, K. O. Eguare","doi":"10.4314/NJCR.V24I1","DOIUrl":"https://doi.org/10.4314/NJCR.V24I1","url":null,"abstract":"The performance of graphite oxides from waste batteries and carbonized maize cobs as filler in natural rubber was evaluated in this study. Graphite from carbon electrodes in waste batteries and carbonized maize cobs respectively were subjected to the conventional Hummers method for conversion to the more reactive graphite oxides. The oxides were characterized in terms of their surface area, ash content, pH, moisture content, conductivity and loss on ignition using standard methods. The oxides were further characterized in terms of their morphology and functional groups. The graphite oxides and N330 carbon black which acts as the control were then used as filler in natural rubber compounding using the two–roll mill and subjected to physicomechanical characterization. The graphite oxides showed significant enhancement in the reinforcement and mechanical properties of the natural rubber compounds as evidenced from the results obtained when compared with the control. Morphological study of the vulcanizates shows that natural rubber – maize cob graphite oxide (NR/MCGO) vulcanizates showed very good dispersion in the rubber matrix. Mechanical properties study shows that NR/MCGO vulcanizates are having improved properties with tensile strength of 32.79MPa, modulus at 100% elongation of 19.51MPa. However, NR/MCGO vulcanizates show lower elongation at break of 500.02%. The highest hardness value is NR/MCGO of 71.01 IRHD. Keywords : Maize cob, natural rubber, fillers, graphite oxides","PeriodicalId":102130,"journal":{"name":"Nigerian Journal of Chemical Research","volume":"87 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127993475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Waste printing paper as analogous adsorbents for heavy metals in aqueous solution 废印刷纸作为水溶液中重金属的类似吸附剂

Nigerian Journal of Chemical Research Pub Date : 2017-08-24 DOI: 10.4314/njcr.v22i1

O. Moyib, M. A. Ayedun, O. Awokoya, O. Omotola

{"title":"Waste printing paper as analogous adsorbents for heavy metals in aqueous solution","authors":"O. Moyib, M. A. Ayedun, O. Awokoya, O. Omotola","doi":"10.4314/njcr.v22i1","DOIUrl":"https://doi.org/10.4314/njcr.v22i1","url":null,"abstract":"Waste printing paper (WPP) is an abundant local waste material that requires end-use channelling to reduce environmental pollution. In the present study, removal of cadmium (II) (Cd 2+ ), copper (II) (Cu 2+ ), nickel (II) (Ni 2+ ) and lead (II) ions (Pb 2+ ) from aqueous solution by WPP at varying incubating period, metal dosage and chemical modification with hydrogen peroxide were studied. In addition, desorption capacity of three solvents, distilled water (dil.H 2 O), 0.1M nitric acid, (HNO 3 ), and ethylenediaminetetracetic acid (EDTA) was evaluated for possible recovery of Pb 2+ . The results showed WPP has adsorption efficacy of >90.0% and metal uptake of ≤ 25 mg/g for the assessed metal ions. There was high effect of metal dosage and contact time on WPP adsorption efficacy for the metal ions. Hydrogen peroxide treatment has negative effect on the WPP adsorption efficacy for Cd and Ni (II) ions, necessitating FTIR of WPP for possible functional groups distortion. The eluents used could recover <50 % adsorbed Pb 2+ from WPP. WPP has potential as good adsorbent for heavy metals uptake from aqueous solutions but the recovery efficacy as economic and environmental concern requires further investigation. Keywords: Adsorption efficacy, desorption efficacy, lead (II) ions, metal ions, waste printing paper","PeriodicalId":102130,"journal":{"name":"Nigerian Journal of Chemical Research","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122280468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Removal of Ni (II), Co (II) and Pb (II) ions from aqueous media using Starch Stabilized Magnetic Nanoparticles as adsorbents 用淀粉稳定磁性纳米颗粒作为吸附剂去除水介质中的Ni (II)、Co (II)和Pb (II)离子

Nigerian Journal of Chemical Research Pub Date : 2015-12-17 DOI: 10.4314/NJCR.V20I0

J. Konne, Pg Tubotamuno, Rf Okwelle, Fb Dimeari

{"title":"Removal of Ni (II), Co (II) and Pb (II) ions from aqueous media using Starch Stabilized Magnetic Nanoparticles as adsorbents","authors":"J. Konne, Pg Tubotamuno, Rf Okwelle, Fb Dimeari","doi":"10.4314/NJCR.V20I0","DOIUrl":"https://doi.org/10.4314/NJCR.V20I0","url":null,"abstract":"Varying percentages (0, 0.005, 0.010, 0.015, 0.020 and 0.025) of ecofriendly Starch Stabilized Magnetic Nanoparticles (SSMNPs) were used in the removal of M 2+ (Ni 2+ , Co 2+ and Pb 2+ ) ions from aqueous media by the batch adsorption technique. The λmax determined and used for Ni 2+ , Co 2+ and Pb 2+ were 400, 380 and 320 nm respectively. The influence of pH, adsorbent starch concentration, initial metal concentration and contact time on the removal processes was investigated. The results showed that 0.025 % loaded SSMNPs gave the optimal sorption efficiencies of 91.3 (pH = 6.8 & 11.1), 90.91 and 96.97 % (at pH < 3) respectively for all three ions. The contact times required to reach the equilibrium concentrations were 15, 75 and 105 mins for Pb 2+ , Co 2+ and Ni 2+ ions respectively. The kinetic rate constants (Lagergren and Pseudo-2 nd -order) for Ni 2+ and Co 2+ adsorption were all greater than those from Pb2+ions. Langmuir correlation coefficients showed a better fit for the adsorption isotherms. Ni sorption capacity of 60.61 mg g -1 obtained from Langmuir was the highest of the three at constant [SSMNPs] while 109.89 mg g -1 for Pb with was the highest at constant [M 2+ ].","PeriodicalId":102130,"journal":{"name":"Nigerian Journal of Chemical Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114343978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Newly identified Molecular Marker Compound in Some Nigerian oils. 尼日利亚部分油中新发现的分子标记化合物。

Nigerian Journal of Chemical Research Pub Date : 2007-11-19 DOI: 10.4314/NJCR.V11I1.35628

S. Abrakasa

引用次数: 8

Studies of Ni(II) & Cu(II) complexes with ampicillin 镍(II)和铜(II)与氨苄西林配合物的研究

Nigerian Journal of Chemical Research Pub Date : 2007-11-19 DOI: 10.4314/NJCR.V11I1.35630

P. Guru

引用次数: 0