Novel and Fast Microwave-Assisted Synthesis of Carbon Quantum Dots from Raw Cashew Gum

Pires, Natália R.; Santos, C.; Sousa, Rayane R.; Paula, Regina C.M. de; Cunha, Pablyana Leila Rodrigues da; Feitosa, Judith P.A.

doi:10.5935/0103-5053.20150094

Cited by 48 publications

(45 citation statements)

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“…† Several reactions, including dehydration, polymerization, carbonization, and passivation, take place over the formation of N-CDs using a hydrothermal route. [34][35][36][37][38][39][40][41] First, at elevated temperatures, CMC molecules hydrolyze to form glucose. Additionally, PEG reacts with the aldehyde of glucose to form glucosamines.…”

Section: Optimization Of Synthesis Conditionsmentioning

confidence: 99%

Efficient removal of Cu(ii) from aqueous systems using enhanced quantum yield nitrogen-doped carbon nanodots

2020

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Section: Optimization Of Synthesis Conditionsmentioning

confidence: 99%

Efficient removal of Cu(ii) from aqueous systems using enhanced quantum yield nitrogen-doped carbon nanodots

2020

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“…The formation of graphitic and pyridinic N indicate the effective N-doping of CD. Meanwhile, non-graphitic amines like N-H distributed around CDs through Maillard chemistry reaction [ 54 , 55 , 56 , 57 , 58 , 59 , 60 ]. The O 1 s spectrum ( Figure 3 c) showed two peaks at 530.7 and 531.9 eV corresponding to O-H and C=O, respectively.…”

Section: Resultsmentioning

confidence: 99%

Sustainable Development of Enhanced Luminescence Polymer-Carbon Dots Composite Film for Rapid Cd2+ Removal from Wastewater

Issa

Abidin

2020

Molecules

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As a remedy for environmental pollution, a versatile synthetic approach has been developed to prepare polyvinyl alcohol (PVA)/nitrogen-doped carbon dots (CDs) composite film (PVA-CDs) for removal of toxic cadmium ions. The CDs were first synthesized using carboxymethylcellulose (CMC) of oil palms empty fruit bunch wastes with the addition of polyethyleneimine (PEI) and then the CDs were embedded with PVA. The PVA-CDs film possess synergistic functionalities through increasing the content of hydrogen bonds for chemisorption compared to the pure CDs. Optical analysis of PVA-CDs film was performed by ultraviolet-visible and fluorescence spectroscopy. Compared to the pure CDs, the solid-state PVA-CDs displayed a bright blue color with a quantum yield (QY) of 47%; they possess excitation-independent emission and a higher Cd2+ removal efficiency of 91.1%. The equilibrium state was achieved within 10 min. It was found that adsorption data fit well with the pseudo-second-order kinetic and Langmuir isotherm models. The maximum adsorption uptake was 113.6 mg g−1 at an optimal pH of 7. Desorption experiments showhe that adsorbent can be reused fruitfully for five adsorption-desorption cycles using 0.1 HCl elution. The film was successfully applied to real water samples with a removal efficiency of 95.34% and 90.9% for tap and drinking water, respectively. The fabricated membrane is biodegradable and its preparation follows an ecofriendly green route.

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“…Karbon dot (carbon dots) merupakan salah satu jenis nanomaterial karbon tipe 0 dimensi dengan bentuk struktur kuasi-sferis berukuran kurang dari 10 nm [1,2]. Karbon dot ditemukan secara tidak sengaja pada tahun 2004 sebagai salah satu zat yang dihasilkan dari proses purifikasi jenis nanomaterial lain yaitu single-walled carbon nanotubes (SWNT) [3,4]. Walaupun ditemukan secara tidak sengaja, karbon dot memiliki sifat menarik sehingga perlu diteliti lebih lanjut [4].…”

Section: Pendahuluanunclassified

“…Puncak emisi karbon dot baru terbentuk pada sampel yang telah dipanaskan dalam oven microwave. Hal ini sesuai dengan teori bahwa teknik microwave merupakan salah satu cara sintesis karbon dot dari bahan alam [3]. Dari GAMBAR 5, terlihat bahwa lama pemanasan mempengaruhi intensitas pendaran karbon dot daun pepaya.…”

Section: Hasil Dan Pembahasanunclassified

Analisis Fotoluminesensi Karbon Dot Dari Daun Teh Dan Daun Pepaya Dengan Teknik Microwave

Ghifari

Putra

Isnaeni

2017

Prosiding Seminar Nasional Fisika (E-Journal) Snf2017 Unj

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AbstrakTelah dibuat nanopartikel karbon dot dari daun teh olahan dan daun pepaya dengan menggunakan teknik microwave. Tujuan dari penelitian ini adalah mempelajari perubahan sifat optik pendaran nanopartikel karbon dot dengan uji fotoluminesensi. Untuk membuat karbon dot, daun teh olahan dan daun pepaya diekstrak menggunakan blender dan aquades, kemudian diletakkan dalam oven microwave 5, 10, 20 dan 40 menit. Penyaringan lanjutan dilakukan untuk mendapatkan nanopartikel karbon dot yang homogen. Pengujian fotoluminesensi dilakukan dengan mengeksitasi koloid karbon dot dengan laser dioda pada panjang gelombang 405 nm. Pendaran cahaya karbon dot direkam spektrometer. Pada umumnya pendaran cahaya karbon dot menghasilkan warna biru kehijauan. Hasil pengujian fotoluminesensi menunjukkan bahwa kurva pendaran karbon dot dari daun teh berbeda dengan daun pepaya. Waktu pemanasan sampel dalam microwave juga berpengaruh pada kurva pendaran karbon dot. Perubahan kurva pendaran menunjukkan struktur pita energi pada karbon dot tersebut. Dari penelitian ini dapat disimpulkan bahwa karbon dot dari bahan alam dapat mudah dibuat dengan teknik microwave dan sifat optiknya dapat diuji dengan teknik fotoluminesensi.Kata-kata kunci: karbon dot, fotoluminesensi, daun teh, daun pepaya. AbstractCarbon dot nanoparticles from processed tea leaves and papaya leaves produced using microwave technique have been made. The purpose of this research was to study the change of optical properties of carbon dot nanoparticles luminescence with photoluminescence test. To make carbon dots, processed tea leaves and papaya leaves were extracted using blender and distilled water, then were put in microwave oven for 5, 10, 20 and 40 minutes. Filtering was done for getting homogeneous carbon dot nanoparticles. Photoluminescence test was performed by exciting the colloidal carbon dot with a diode laser at a wavelength of 405 nm. Luminescent light of carbon dot was recorded by spectrometer. In general, luminescent light of carbon dots was cyan. The results of photoluminescence test showed that the luminescence curves of tea leaves and of papaya leaves were different. The sample heating time in microwave also affected the carbon dot luminescence curves. The change in the luminescence curve showed the structure of energy band on the carbon dot. From this study it can be concluded that carbon dot from natural materials can be easily made by microwave technique and photoluminescence technique can analyze the optical properties.

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Novel and Fast Microwave-Assisted Synthesis of Carbon Quantum Dots from Raw Cashew Gum

Cited by 48 publications

References 0 publications

Efficient removal of Cu(ii) from aqueous systems using enhanced quantum yield nitrogen-doped carbon nanodots

Efficient removal of Cu(ii) from aqueous systems using enhanced quantum yield nitrogen-doped carbon nanodots

Sustainable Development of Enhanced Luminescence Polymer-Carbon Dots Composite Film for Rapid Cd2+ Removal from Wastewater

Analisis Fotoluminesensi Karbon Dot Dari Daun Teh Dan Daun Pepaya Dengan Teknik Microwave

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