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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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کھیلوں کا کردار پر اثر
نحمدہ ونصلی علی رسولہ الکریم امّا بعد فاعوذ بااللہ من الشیطن الرجیم
بسم اللہ الرحمن الرحیم
معزز اسا تذہ کرام اور میرے ہم مکتب شاہینو! آج مجھے جس موضوع پر لب کشائی کا موقع فراہم کیا گیا ہے وہ ہے:’’کھیلوں کا کردار پراثر ‘‘
معزز حاضر ین!
جہاں تک کردار کا تعلق ہے یہ قوموں کی زندگی میں ریڑھ کی ہڈی کی حیثیت رکھتا ہے۔ تعلیمات اسلام اور عبادات دین کا اگربنظرِ غائرمطالعہ اور مشاہدہ کیا جائے تو جو چیز سامنے آتی ہے وہ اچھے کردار اور اخلاق کی تخلیق ہے۔ جملہ احکام الہیہ بھی ایک انسان میں اچھے کردار اور اخلاق کے متمنی ہیں۔ اورقرآن جس کا موضوع انسان ہے وہ بھی ایک اچھے انسان کا خواہش مند ہے۔ جو دین ودنیا میں ہرلحاظ سے کامیاب ہو۔بقول شاعر:
بات کردار کی ہوتی ہے وگرنہ عارفؔ
قد میں انسان سے سایہ بھی بڑا ہوتا ہے
ذہین انسان ہی با کردار ہوتا ہے۔ ماہر نفسیات کہتے ہیں کہ ذہن جب باہر آتا ہے تو کردار بن جاتا ہے کردار جب اندر جاتا ہے تو ذہن بن جاتا ہے۔
صدرِذی وقار!
یہ موضوع بہت طویل ہے میں صرف مذکورہ موضوع پر چند گزارشات پیش کرنا چاہتا ہوں۔ تاریخِ اقوام عالم پر نظر دوڑائیں تو کاروبار اور محنت و مشقت کے ساتھ ساتھ آپ کو ایسے لمحات بھی دکھائی دیں گے جن میں تفریح اور کھیل کودکے سوا کچھ نہیں ہوگا۔ کھیل کود کا تصور اسلام میں بھی موجود ہے کہ محسنِ کائنات حضرت محمدؐ نے بھی تیرا کی اور دوڑ کے مقابلوں میں حصہ لیا۔ کھیل اور تفر یحی پروگرام کردار پر بڑا اچھا اثر ڈالتے ہیں۔ یہی وجہ ہے کہ دیگر ممالک کی طرح پاکستانی نظام تعلیم میں اور اوقات تعلیم و تدریس میں بھی باقاعدہ ڈرل کا پیریڈ ہوتا ہے۔...

PEMBELAJARAN NILAI NILAI KARAKTER ISLAM MODERAT DI PERGURUAN TINGGI

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Fault Diagnosis and Fault Tolerant Control of Switched Dynamical Systems

Modern technological systems consist of many components with strong interactions between them. Faults may cause an unacceptable loss of the system functionality, instability, or fatality. Systems capable of automatically detecting, diagnosing faults, and maintaining the overall functionality are desirable. Fault diagnosis (FDD) is a process that detects, locates, andnds nature of fault. Fault tolerant control (FTC) system has the ability to tolerate faults. Among dynamical systems, switched systems (SS) have numerous applications in control of robotics, automotive industry, aircraft and air tra c control, industrial electronics (power converters) etc. A typical SS is composed of a family of subsystems and a rule that governs the switching among them. Ideally, the FDD/FTC systems are designed on the basis of assumption that it is switching synchronously with corresponding subsystems of SS; that is; FDD/FTC system switches exactly at the time of switching in the switched system to be monitored. However, in practice, the switching in FDD/FTC system lags the switching of the switched system to be monitored. This creates a particular interest in the design of FDD/FTC systems especially when there is event-based switching. In this dissertation, the term\asynchronous" is used to illustrate this situation. This thesis studies the design of FDD and FTC systems of SS under asynchronous switching scenario, in the presence of disturbances and noise (unknown inputs). In therst part, a framework for fault detection and isolation (FDI) is proposed. The residual (symptom signal) is so generated that it is sensitive to faults and robust against disturbances. A multi-objective problem is formulated based on H?=H1ltering. Using the average dwell time approach and the piecewise Lyapunov function technique, su cient conditions are suggested in terms of linear matrix inequalities (LMIs) to guarantee the stability and desired performance. In addition, the proposed framework has also been extended to design FDI strategy for uncertain SSs. A norm-bounded uncertainty is considered. To improve the FDD capability adaptive threshold scheme is developed. xiii In the second part, fault estimation (FE) and FTC schemes are proposed. The proposed framework is based on unknown input observer (UIO) and H1 optimization. On the basis of FE, recon guring control law approach is utilized to tolerate faults. To this end, an integrated approach for FE/FTC is proposed for SSs. The last part of this dissertation addresses another very important problem of highly practical interest; that is, the design of fault detection (FD) scheme for switched system with state delays, under asynchronous switching. The tools from robust control theory, Lyapunov stability theory, and linear matrix inequality are used to propose the schemes. To demonstrate the e ectiveness of the proposed schemes, the algorithms have been tested on the dynamics of highly maneuverable aircraft technology (HiMAT) and battery converter unit (BCU) of hybrid electric vehicle.