Grafitik karbon nitrür ve bor nitrür içeren kompozit yapıların hazırlanması; çevre ve enerji uygulamaları
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Tarih
2022
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info:eu-repo/semantics/openAccess
Özet
Yarı iletken nanokompozit malzemeler son yıllarda çevresel iyileĢtirme ve enerji
uygulamaları için yoğun ilgi görmektedir. Bu tez çalıĢması kapsamında nanamalzeme
katkılı membranlar ve süperkapasitörler üretilmiĢtir. Yüksek termal stabilitesi ve iyi
dağılabilirlik, kimyasal kararlılık, elektriksel yalıtım özellikleri ve toksik olmamaları
sebebiyle grafitik karbon nitrür (g-C3N4) ve bor nitrür kuantum noktalar (BNKN) bu
uygulamalarda nanokompozit malzemelerin esas bileĢenleri olarak kullanılmıĢtır.
g-C3N4 ve BNKN üretimi sırasıyla sinterleme ve hidrotermal iĢlem ile
gerçekleĢtirilmiĢtir. Nanomalzemelerin çevresel uygulamalarında, ağırlıkça % 0.5, %
1.0 ve % 2.0 g-C3N4 veya BNKN içeren polietersülfon (PES) membranlar (gC3N4@PES, BNKN@PES) bir döküm ünitesinde üretilmiĢtir. Membranların saf su akı
geçirgenlik performansı ile birlikte membran tıkanıklığını önleme ve kirlilik çalıĢmaları
da araĢtırılmıĢtır. Hibrit membranların, saf PES membrandan daha iyi temizleme
özelliği sergilediği görülmüĢtür.
Enerji uygulamalarında kullanılmak üzere, g-C3N4 veya BNKN içeren grafen
elektrotlar hazırlanmıĢtır. Bu kapsamda, farklı miktarlarda alınan g-C3N4 veya BNKN
(15 mg / 30 mg / 60 mg), indirgenmiĢ grafen oksit (rGO) (30 mg) ile hidrotermal iĢleme
tabii tutularak, süperkapasitör uygulamalarında kullanılabilecek elektrotlar (gC3N4@rGOH ve BNKN@rGOH) hazırlanmıĢ ve uygun tekniklerle (XRD, SEM, CV,
BET, ZETA) karakterize edilmiĢtir. Bu hibrit yapılardan üretilen elektrotların spesifik
kapasitans değerleri, empedans eğrileri ve Ģarj/deĢarj performansları elektrokimyasal
teknikler ile analiz edilmiĢtir. g-C3N4@rGOH (30 mg/15 mg oranlarında) hazırlanan
elektrotun 157.4 F g
-1
spesifik kapasitans değeri ile en yüksek performansa sahip olduğu
bulunmuĢtur. EĢit oranlarda hazırlanan BNKN@rGOH (30 mg/30 mg oranlarında)
ii
hibrit yapısından ise 207.25 F g-1
spesifik kapasitans değeri ile en yüksek performansa
sahip olduğu bulunmuĢtur. Bu tez çalıĢmasından elde edilen sonuçlara göre; üretilen
hibrit yapıların, çevre ve enerji uygulamalarında gelecek vaad ettiği görülmektedir.
Semiconductor nanocomposite materials have attracted intense interest for environmental remediation and energy applications in recent years. In this thesis, nanomaterial doped membranes and supercapacitors were produced. Graphitic carbon nitride (g-C3N4) and boron nitride quantum dots (BNKN) have been used as the main components of nanocomposite materials in these applications due to their high thermal stability and good dispersibility, chemical stability, electrical insulating properties and non-toxicity. The production of g-C3N4 and BNKN was carried out by heating process and hydrothermal treatment, respectively. In environmental applications of nanomaterials, polyethersulfone (PES) membranes (g-C3N4 @PES, BNKN@PES) containing 0.5 %, 1.0 % and 2.0 % by weight g-C3N4 or BNKN were produced in a casting unit. Along with the pure water flux permeability performance of the membranes, membrane fouling prevention and pollution studies were also investigated. It has been observed that hybrid membranes to display better cleaning properties than pure PES membranes. Graphene-based electrodes containing g-C3N4 or BNKN have been prepared for use in energy applications. In this context, electrodes (g-C3N4@rGOH ve BNKN@rGOH) that can be used in supercapacitor applications were prepared by hydrothermal treatment with reduced graphene oxide (rGO) (30 mg) of g-C3N4 or BNKN (15 mg / 30 mg / 60 mg), taken in different amounts, and with appropriate techniques (XRD, SEM, CV. BET, ZETA) were characterized. The specific capacitance values, impedance curves and charge/discharge performances of the electrodes produced from these hybrid structures were analyzed by electrochemical techniques. It was found that the electrode prepared g-C3N4@rGOH (at the ratio of 30 mg/15 mg) had iv the highest performance with a specific capacitance value of 157.4 F g-1. It was found that the hybrid structure of BNKN@rGOH (at the ratio of 30 mg/30 mg), prepared in equal proportions, had the highest performance with a specific capacitance value of 207.25 F g-1 . According to the results obtained from this thesis study; It is seen that the hybrid structures produced are promising in environmental and energy applications.
Semiconductor nanocomposite materials have attracted intense interest for environmental remediation and energy applications in recent years. In this thesis, nanomaterial doped membranes and supercapacitors were produced. Graphitic carbon nitride (g-C3N4) and boron nitride quantum dots (BNKN) have been used as the main components of nanocomposite materials in these applications due to their high thermal stability and good dispersibility, chemical stability, electrical insulating properties and non-toxicity. The production of g-C3N4 and BNKN was carried out by heating process and hydrothermal treatment, respectively. In environmental applications of nanomaterials, polyethersulfone (PES) membranes (g-C3N4 @PES, BNKN@PES) containing 0.5 %, 1.0 % and 2.0 % by weight g-C3N4 or BNKN were produced in a casting unit. Along with the pure water flux permeability performance of the membranes, membrane fouling prevention and pollution studies were also investigated. It has been observed that hybrid membranes to display better cleaning properties than pure PES membranes. Graphene-based electrodes containing g-C3N4 or BNKN have been prepared for use in energy applications. In this context, electrodes (g-C3N4@rGOH ve BNKN@rGOH) that can be used in supercapacitor applications were prepared by hydrothermal treatment with reduced graphene oxide (rGO) (30 mg) of g-C3N4 or BNKN (15 mg / 30 mg / 60 mg), taken in different amounts, and with appropriate techniques (XRD, SEM, CV. BET, ZETA) were characterized. The specific capacitance values, impedance curves and charge/discharge performances of the electrodes produced from these hybrid structures were analyzed by electrochemical techniques. It was found that the electrode prepared g-C3N4@rGOH (at the ratio of 30 mg/15 mg) had iv the highest performance with a specific capacitance value of 157.4 F g-1. It was found that the hybrid structure of BNKN@rGOH (at the ratio of 30 mg/30 mg), prepared in equal proportions, had the highest performance with a specific capacitance value of 207.25 F g-1 . According to the results obtained from this thesis study; It is seen that the hybrid structures produced are promising in environmental and energy applications.
Açıklama
Anahtar Kelimeler
Nanokompozit Malzemeler, Nanomalzeme Katkılı Membran Sentezi, Atık Su Arıtımı, Enerji Depolama, Süperkapasitör, Nanocomposite Materials, Nanomaterial Doped Membrane Synthesis, Waste Water Treatment, Energy Storage, Supercapacitor
