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Home > Electrospun Silicon Dioxide and Bismuth Silicate Nanofibers for Sensing and Photocatalysis Applications

Electrospun Silicon Dioxide and Bismuth Silicate Nanofibers for Sensing and Photocatalysis Applications

Thesis Info

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Author

Batool, Syeda Sitwat

Program

PhD

Institute

Pakistan Institute of Engineering and Applied Sciences

City

Islamabad

Province

Islamabad

Country

Pakistan

Thesis Completing Year

2014

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1159

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726048502

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Metal oxide nanofibers were fabricated using electrospinning technique. Electrical measurements were used as a diagnostic tool for gas sensing application. Photocatalytic activity of metal oxide nanofibers was measured for degradation of organic contaminants in water. The synthesized metal oxide nanofibers were of titanium dioxide (TiO2), silicon dioxide (SiO2), bismuth modified silicon dioxide (Bi-modified SiO2) and bismuth silicate (Bi4(SiO3)4). The diameters of fabricated nanofibers were ~150 – 200 nm and length is of several micrometers. AC impedance spectroscopy of TiO2 nanofibers was performed in the temperature range of 333 K – 513 K. Dielectric loss peak in loss tangent confirmed the presence of relaxing dipoles. The AC conductance as a function of frequency obeys the Jonscher’s power law. The effect of metal (Ti, Ni, and Au) electrodes on humidity sensing properties of TiO2 nanofibers was investigated from 40% – 90% relative humidity (RH) at room temperature. TiO2 nanofibers RH sensor with Ti-electrode had higher sensitivity of 7.53 MΩ/∆%RH, fast response and recovery time of 3 s and 5 s, respectively, as compared to other electrode sensors. SiO2 nanofibers RH sensor was also investigated and it had sensitivity of 9.40 MΩ/∆%RH, quick response and recovery time of 5 s and 3 s, respectively. All sensors were stable, having good reproducibility and low hysteresis values. Oxygen sensing properties of SiO2, Bi-modified SiO2 and Bi4(SiO3)4 nanofibers were investigated by changing the oxygen concentration inside the chamber using different gas flow rates. The performance of the sensors was evaluated from 298 K – 400 K in oxygen rich environment. SiO2, Bi-modified SiO2 and Bi4(SiO3)4 nanofibers oxygen sensors had response time of 58 s, 51 s and 49 s, respectively (error < 5 %). The photodegradation of cationic (methylene blue (MB) and Safranin O (SO)) and anionic (methyl orange (MO)) dyes were performed using photocatalyst i.e. SiO2, Bi-modified SiO2 and Bi4(SiO3)4 nanofibers. The photodegradation rate of SiO2 photocatalyst increased from 0.008 min-1 - 0.085 min-1 (MO), 0.071 min-1 – 0.312 min-1 (SO) and 0.081 min-1 – 0.231 min-1 (MB) with increasing Bi contents from 1 % to 10 %. In case of Bi4(SiO3)4 nanofibers photocatalyst the photodegradation rate was 0.273 min-1, 0.409 min-1 and 0.406 min-1 for MO, SO and MB respectively.
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اگلا جہان

اگلا جہان
ماپیاں دے گھر سدا نہیں رہنا ہک دن توں ٹر جانا
دم دم رب رب ورد پکا توں ایہہ تیرے کم آنا

ماں تیرا پئی داج بناندی
محنت کر کے پئی پڑھاندی
ہر دم صدقے واری جاندی
اک دن اوسے ماں نے تینوں ڈولی دے وچ پانا
دم دم رب رب ورد پکا توں ایہہ تیرے کم آنا

جوبن وچ مغرور کڑے
کیوں پھرنی ایں لا سندور کڑے
کی کرسیں پیش حضور کڑے
کلم کلیاں اگے جانا اوتھے جا کے توں پچھتانا
دم دم رب رب ورد پکا توں ایہہ تیرے کم آنا

مکھ تیرے تے آئی بہار
جد ویکھن ، رُکدے اسوار
جھلدے نہ اکھیاں دے وار
جوبن ڈھلیا تے تیرے ول کسے نہ مکھ پرتانا
دم دم رب رب ورد پکا توں ایہہ تیرے کم آنا

بلبل کردی موج بہاراں
وچھڑی کونج تے گئیاں ڈاراں
کیہڑا سنگی حشر بزاراں
ویکھ جنازہ ہک دن تیرا بھائیاں چک لے جانا
دم دم رب رب ورد پکا توں ایہہ تیرے کم آنا

ایہہ دنیا بہت سہانی اے
ایتھے چلنی نہیں من مانی اے
دن قادریؔ چار جوانی اے
ہک دن ایسا قادری آسی توں وی صاحب دے ول جانا
دم دم رب رب ورد پکا توں ایہہ تیرے کم آنا

The Relationship Between Competence and Job Satisfaction on the Performance of Private Madrasah Tsanawiyah Teachers in the City of Surabaya

This study aims to discuss the relationship between competence and job satisfaction on the performance of private Madrasah Tsanawiyah teachers in the city of Surabaya. The research method used is the type of research used that is explanatory with a quantitative approach with a sample size of 244 of 628 teachers from 44 private Madrasah Tsanawiyah in the city of Surabaya). The results showed that teachers’ competence had an effect on teachers’ job satisfaction with a value of 0.184. Teachers’ competence affected teachers’performance with a value of 0.118. Teachers’ job satisfaction affected teachers’ performance with a value of 0.222. Teachers’ job satisfaction on teachers’  performance showed a high influence with a CR value of 2.772 (greater than 2.00) and a significance level (p-value) of 0.006 (less than 5%). It can be concluded that teachers’ competence affected teachers’ job satisfaction and teachers’ competence affected teachers’  performance. Teachers’ job satisfaction had a strong effect on teachers’ performance.

Impact of Tillage and Integrated Plant Nutrient Management on Cereal-Legume Cropping System Uner Irrigated and Non-Irrigated Conditions.

A series of field experiments were conducted to evaluate the integrated application of organic and inorganic nutrient source, cropping systems and different tillage methods under irrigated and non-irrigated conditions and study their effects on soil physiochemical properties, soil fertility and crop productivity. The experiments were carried out at Agricultural Research Station Serai Naurang, Bannu, Pakistan. Tillage methods included deep (DT) and conventional shallow tillage (CT) while cropping system consisted of wheat-maize-wheat, wheat-mungbean-wheat under irrigated condition and wheat-mungbean-wheat, wheat-fallow-wheat under non-irrigated condition. The fertilizers treatments were farmer’s practice T1 (50 % NP), balance inorganic fertilizers T2 (100 % NPK recommended dose i.e. 120, 90 and 60 kg ha-1), integrated inorganic and organic fertilizers T3 (50 % N + 100 % PK + 10 tons FYM ha-1) and T4 (25 % N + 100 % PK + 20 tons FYM ha-1). The experimental design was RCB with split-split plot arrangement having three replications. Tillage was allotted to main plots, cropping system to subplots and fertilizer treatments to sub-subplots. Deep tillage treatment resulted higher soil available water holding capacity, mineral N and lower soil bulk density than CT under both the conditions. Higher wheat straw, grain and total NPK uptakes was observed in DT than CT. The straw and grain yield of wheat significantly increased with deeply ploughed plots under both irrigated and non-irrigated conditions. However, soil organic matter (OM), AB-DTPA extractable P and K, pH, microbial biomass and population was not affected by any tillage methods. Mungbean-wheat cropping system had performed better than maize-wheat or fallow-wheat. Greater soil OM, mineral N, N uptake, microbial biomass and microbial population was recorded in mungbean-wheat rotation than fallow-wheat under non-irrigated condition, whereas higher wheat straw and grain yield was recorded in mungbean-wheat compared to maize-wheat rotation under irrigated condition. Similarly, incorporation of FYM either 10 tons with 50 % N + 100 % PK (T3) or 20 tons with 25 % N + 100 % PK (T4) had increased soil available water holding capacity, organic matter, mineral N, AB-DTPA extractable P and K, microbial biomass and population but decreased soil bulk density under both conditions. Greater straw N, P and K contents were measured in plots having 50 % N + 100 % PK + 10 tons FYM ha-1 and 25 % N + 100 % PK + 20 tons FYM ha-1 compared to the plots receiving sole mineral fertilizers, whereas grain N was increased in plots receiving balance inorganic fertilizers under both the conditions. Integrated application of 50 % N + 100 % PK with 10 tons FYM ha-1 had improved straw, grain and total N, P and K uptakes compared to other treatments under each conditions. Fertilization of 50 % N + 100 % PK with 10 tons FYM ha-1 had further improved wheat grain yield with 56 % increase under irrigated condition and 49 % increase over farmer’s practice under non-irrigated condition followed by the plots receiving sole recommended 100 % NPK. The summer crops of maize and mungbean responded significantly to combine application of organic and inorganic fertilizers. Addition of 50 % N + 100 % PK + 10 tons FYM ha-1 had increased maize grain and stover yield compared to the other treatments under irrigated condition. Plots incorporated with 50 % N + 100 % PK + 10 tons FYM ha-1 or 25 % N + 100 % PK + 20 tons FYM ha-1 produced comparable yield of mungbean, but significantly higher from plots having sole inorganic fertilizers under both the conditions. Integrated use of 50 % N + 100 % PK + 10 tons FYM ha-1 with DT under wheat-mungbean-wheat cropping system had improved crop productivity and soil fertility beside soil health and environmental benefits and thus recommended for irrigated and non-irrigated wheat sowing in agro-climatic condition of Bannu, Pakistan.