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Preparation, Analysis and Photocatalytic Applications of Carbon Nanotubes Supported Bimetallic Oxides Nanoparticles

Thesis Info

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Author

Zada, Noor

Program

PhD

Institute

University of Malakand

City

Malakand

Province

KPK

Country

Pakistan

Thesis Completing Year

2019

Thesis Completion Status

Completed

Subject

Chemistry

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/11724/1/Noor%20Zada_Chem_2019_Malakand_PRR.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726997787

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Multi-walled carbon nanotubes (MWCNTs) were treated with HNO3 and H2SO4 to obtain activated/functionalized multi-walled carbon nanotubes (A-MWCNTs). The functionalization increases the stability and dispersive properties of the A-MWCNTs. A-MWCNTs supported and unsupported bimetallic oxides nanoparticles were synthesized from their respective salts through chemical reduction method. Five different supported and unsupported bimetallic oxides nanoparticles (A-MWCNTs/Mn–Zn oxides and Mn-Zn oxides NPs), (A-MWCNTs/Fe-Mn oxides and Fe-Mn oxides NPs), (A-MWCNTs/Cu-Ti oxides and Cu-Ti oxides NPs), (A MWCNTs/Ag-Co oxides and Ag-Co oxides NPs) and (A-MWCNTs/Co-Ti oxides and Co-Ti oxides NPs) were prepared. The supported and unsupported bimetallic nanoparticles were characterized by various instrumental techniques like scanning electron microscopy (SEM), energy dispersive X-rays (EDX) and X-rays diffraction (XRD). The SEM images shows that bimetallic oxides nanoparticles are mostly in spherical form. It also shows that the supported bimetallic oxides NPs are mostly in dispersed form on the surface of A-MWCNTs while the unsupported bimetallic oxides NPs are in agglomerated form and hence have low surface area as compared to the supported bimetallic oxides NPs. The EDX spectra show the concerned composition of the prepared supported and unsupported bimetallic oxides NPs. The EDX spectra also revealed that bimetallic NPs are in their oxides form as confirmed from the presence of oxygen. The presence of oxygen also confirms the functionalization of the A-MWCNTs, as carboxyl functional group is introduced during the acid treatment. All the supported and unsupported bimetallic oxides NPs were used as photocatalysts for the degradation of different dyes under UV irradiation in aqueous medium. In the photodegradation study, A-MWCNTs/Mn– Zn oxides and Mn-Zn oxides NPs were used for the photodegradation of malachite green, A MWCNTs/Fe-Mn oxides and Fe-Mn oxides NPs for methylene blue, A-MWCNTs/Cu-Ti oxides and Cu-Ti oxides NPs for alizarin red, A-MWCNTs/Ag-Co oxides and Ag-Co oxides NPs for congo red and A-MWCNTs/Co-Ti oxides and Co-Ti oxides NPs for Rhodamine-B dye photodegradation. The photodegradation of all the dyes shows that the supported bimetallic oxides NPs caused more degradation of the dye compared to the unsupported bimetallic oxides NPs. This is due to the dispersion of the bimetallic NPs on the surface of A-MWCNTs. The effect of various parameters such as the irradiation time, catalyst dosage, dye concentration and pH of the medium on the photodegradation of dyes was studied. The catalytic efficiency of recycled photocatalysts was also evaluated for the same dye under the same experimental conditions, which showed less activity compared to the original photocatalysts.
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فرنچ ایم۔ پیری

فرنچ ایم ، پیری

            مشہور ترک دوست فرنچ ایم، پیری لوطی، کی ۷۳ سال کی عمر میں موت کا تمام دنیا کو علم ہوچکا ہے، لیکن اس سے بہت کم لوگ واقف ہوں گے کہ اس کے مکان میں جاپانی، چینی اور ترکی وضع کے کمروں کے علاوہ ایک مسجد بھی تھی۔ (دسمبر ۱۹۲۳ء)

 

حکم الانتفاع بالمرھون عند الفقهاء: دراسة مقارنة

Islam is a complete code of life and dominant upon all the faculties of life. Along with creed faith and worship, Islam has emphasized on the affairs of daily life. In the connotation of affairs all the components of sale and purchase mentioned in detail. Accordingly, there is a provision if someone sell a thing to another and the buyer is not eligible to pay the price then there should be written a statement in the presence of two witnesses to pay the price in fix time. If there is neither witness nor the arrangement of writing, so there should be mortgaged something from the buyer. When the buyer pay a loan then the seller should return the mortgaged thing. The originality of mortgage is for the protection of loan not for profit. In present era the purpose of mortgage has changed and is done it for getting profit. Although some imams and Ahl-e-Zawaher provide the capacity for getting profit, so the Jamhoor and Ahnaf don’t allow anyone to get it. To change the original shape of mortgage is illegitimate and is considered as usury. If there is no custom in a certain territory and the man who offer loan does not intend to get profit then with the permission of the person who has received loan __provides the facility to get profit, However to avoid this practice is far better in shariah. In the article understudy the originality of mortgage and dissension among different Imams to get profit from it has been discussed. In the end a crucial statement has been mentioned.

Determination and Reduction of Aflatoxins by Gamma Irradiation in Wheat, Maize and Rice

Cereals grown world-wide are used as staple food. Due to high temperature, humidity and non-scientific storage prevail the growth of certain species belong to family Aspergillus. Mycotoxins are small (MW ~700), toxic chemical products formed as secondary metabolites by fungal species that readily settle on crops and infect them with toxins in the field or after harvest, during transport and storage. These compounds cause a potential threat to human and animal health through the intake of food products prepared from these commodities. Generally, crops that are stored for more than a few days become a potential target for mould growth and mycotoxin formation. Mycotoxins can occur both in temperate and tropical regions of the world, depending on the species of fungi. The extraction, clean up and analysis methodology for aflatoxins in cereals (maize, rice and wheat) were validated and found it efficient and good in respect of recovery, reproducibility, repeatability, resolution and cost-effective. The extraction solvent (acetonitrile and water) gave ≥ 85% recovery in spiked cereal samples using MycoSep-226 column. The sensitivity (LOD) of HPLC- FLD was higher as compared to HPLC-UV-Vis after derivatization of sample extract with trifluoroacetic acid (TFA). The collected cereals samples from Faisalabad Division, Pakistan exhibited high level of aflatoxins but after treatment with γ-irradiation, more than 95% reduction in AFB 1 and ≥ 97% in Total (∑AFB 1 , AFB 2 , AFG 1 and AFG 2 ) were observed at a dose of 6 kGy. Significant affect of radiation was found in wheat samples because substantial reduction (≥ 95%) was found in AFB 1 and total aflatoxins at high dose of radiation. The level of aflatoxin contamination was far behind that the recommended limits of EU and FDA, USA. From the results it is evident that γ- irradiation is a good technology to remove contaminants like aflatoxins from cereal commodities. The food quality of irradiated cereals was evaluated to study any chemical change in protein (amino acids), fatty acid composition and fungal biomass using different methods. The total biomass (CFU/g) showed linearity behaviour as increasing the dose level of gamma irradiation. In some samples of cereals, no microflora (fungi) was observed after 72 hrs. of incubation. The fatty acidcomposition revealed that linolenic acid and oleic acid showed decrease whereas no significant change was found in other fatty acids. The unsaturated and poly unsaturated fatty acids remained same after γ-irradiation exposure. The amino acids profile showed that leucine, lysine, tryptophane and valine increased while methionine, phenylalanine and threonine decreased in composition as increased the dose level of exposure of gamma irradiation. Overall no major difference was observed in any essential amino acids. The permanent use of contaminated cereals in the area may pose certain diseases like hepatitis, cancer of liver or effect of other major organs of the human body.