CdSe Quantum Dots/White Graphene Hexagonal Porous Boron Nitride Sheet (h-PBNs) Heterostructure Photocatalyst for Solar Driven H2 Production

2021 ◽  
Author(s):  
Raheman Shakeelur ◽  
Rupali S. Mane ◽  
Higgins Wilson ◽  
Neetu Jha
Keyword(s):  
Active Site ◽  
Charge Separation ◽  
High Surface ◽  
High Surface Area ◽  
H2 Production ◽  
H2 Evolution ◽  
The World ◽  
2D Nanomaterials ◽  
White Graphene ◽  
Photogenerated Charge Separation

In the world of photocatalytic hydrogen (H2) evolution two-dimensional (2D) nanomaterials have attracted widespread attention owing to their high surface area, abundant active site, and excellent photogenerated charge separation properties....

scholarly journals Flower-Shaped C-Dots/Co3O4{111} Constructed with Dual-Reaction Centers for Enhancement of Fenton-Like Reaction Activity and Peroxymonosulfate Conversion to Sulfate Radical

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 135
Author(s):  
Zhibin Wen ◽  
Qianqian Zhu ◽  
Jiali Zhou ◽  
Shudi Zhao ◽  
Jinnan Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Site ◽  
High Surface ◽  
High Surface Area ◽  
Reaction Centers ◽  
Organic Radicals ◽  
The Other ◽  
High Catalytic Activity ◽  
High Adsorption ◽  
High Turnover

Novel flower-shaped C-dots/Co3O4{111} with dual-reaction centers were constructed to improve the Fenton-like reaction activity and peroxymonosulfate (PMS) conversion to sulfate radicals. Due to the exposure of a high surface area and Co3O4{111} facets, flower-shaped C-dots/Co3O4{111} could provide more Co(II) for PMS activation than traditional spherical Co3O4{110}. Meanwhile, PMS was preferred for adsorption on Co3O4{111} facets because of a high adsorption energy and thereby facilitated the electron transfer from Co(II) to PMS. More importantly, the Co–O–C linkage between C-dots and Co3O4{111} induced the formation of the dual-reaction center, which promoted the production of reactive organic radicals (R•). PMS could be directly reduced to SO4−• by R• over C-dots. On the other hand, electron transferred from R• to Co via Co–O–C linkage could accelerate the redox of Co(II)/(III), avoiding the invalid decomposition of PMS. Thus, C-dots doped on Co3O4{111} improved the PMS conversion rate to SO4−• over the single active site, resulting in high turnover numbers (TONs). In addition, TPR analysis indicated that the optimal content of C-dots doped on Co3O4{111} is 2.5%. More than 99% of antibiotics and dyes were degraded over C-dots/Co3O4{111} within 10 min. Even after six cycles, C-dots/Co3O4{111} still remained a high catalytic activity.

Rutile TiO2 single crystals delivering enhanced photocatalytic oxygen evolution performance

Nanoscale ◽  
2021 ◽  
Author(s):  
Bing Fu ◽  
Zhijiao Wu ◽  
Kai Guo ◽  
Lingyu Piao
Keyword(s):  
Catalytic Activity ◽  
Single Crystals ◽  
Oxygen Evolution ◽  
Water Oxidation ◽  
Charge Separation ◽  
High Surface ◽  
Rutile Tio2 ◽  
Highly Efficient ◽  
Photogenerated Charge Separation

Owing to their scientific and technological importance, the development of highly efficient photocatalytic water oxidation systems with rapid photogenerated charge separation and high surface catalytic activity has highly desirable for...

scholarly journals Methods to Scale Down Graphene Oxide Size and Size Implication in Anti-cancer Applications

2020 ◽  
Vol 8 ◽  
Author(s):  
Immacolata Tufano ◽  
Raffaele Vecchione ◽  
Paolo Antonio Netti
Keyword(s):  
Graphene Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Nir Absorption ◽  
Scale Down ◽  
Considerable Impact ◽  
2D Nanomaterials ◽  
The Individual ◽  
Post Synthesis ◽  
Cancer Diagnosis And Therapy

Despite considerable progress in the comprehension of the mechanisms involved in the origin and development of cancer, with improved diagnosis and treatment, this disease remains a major public health challenge with a considerable impact on the social and economic system, as well as on the individual. One way to improve effectiveness and reduce side effects is to consider responsive stimuli delivery systems that provide tailor-made release profiles with excellent spatial and temporal control. 2D nanomaterials possess special physicochemical properties (e.g., light, ultrasonic and magnetic responses) and biological behaviors such as endocytosis, biodistribution, biodegradation, and excretory pathways, which lead to their use in various biomedical applications. In particular, among 2D nanomaterials, graphene and its derivatives, namely graphene oxide (GO) nanomaterials, have attracted enormous attention in cancer diagnosis and therapy because they combine, in a unique material, extremely small size, NIR absorption, delocalized electrons, extremely high surface area, and versatile surface functionality. Taking into account the fundamental role played by GO size, in this review, we summarize the main methods employed to reduce and homogenize in nanometric scale the lateral dimensions of graphene oxide produced by chemical exfoliation of graphite, as well as post-synthesis separation techniques to uniform the size. We also discuss the implication of the small size in cancer treatment by exploiting GO nanocarriers as an effective theranostic tool.

scholarly journals Enhanced photoelectrochemical water splitting performance using morphology-controlled BiVO4 with W doping

2017 ◽  
Vol 8 ◽  
pp. 2640-2647 ◽  
Author(s):  
Xin Zhao ◽  
Zhong Chen
Keyword(s):  
Surface Area ◽  
Light Absorption ◽  
Charge Separation ◽  
High Surface ◽  
High Surface Area ◽  
Charge Injection ◽  
Volume Ratio ◽  
Solvent Ratio ◽  
Photoelectrochemical Performance ◽  
Interfacial Charge

Nanostructures exhibit numerous merits to improve the efficiency in solar-to-energy conversion. These include shortened carrier collection pathways, an increased volume ratio between depletion layer and bulk, enhanced light capture due to multiple light scattering in nanostructures, and a high surface area for photochemical conversion reactions. In this study, we describe the synthesis of morphology-controlled W-doped BiVO4 by simply tuning the solvent ratio in precursor solutions. Planar and porous W-doped BiVO4 thin films were prepared and compared. The porous film, which exhibits increased surface area and enhanced light absorption, has displayed enhanced charge separation and interfacial charge injection. Our quantitative analysis showed an enhancement of about 50% of the photoelectrochemical performance for the porous structure compared to the planar structure. This enhancement is attributed to improved light absorption (13% increase), charge separation (14% increase), and interfacial charge injection (20% increase).

scholarly journals Pt Deposites on TiO2 for Photocatalytic H2 Evolution: Pt Is Not Only the Cocatalyst, but Also the Defect Repair Agent

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1047 ◽  
Author(s):  
Zhan Shu ◽  
Yandi Cai ◽  
Jiawei Ji ◽  
Changjin Tang ◽  
Shuohan Yu ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Charge Separation ◽  
H2 Production ◽  
H2 Evolution ◽  
X Ray ◽  
Production Activity ◽  
Defect Repair ◽  
New Perspective ◽  
Photocatalytic H2 Evolution

Pt, as a common cocatalyst, has been widely used in photocatalytic H2 evolution. However, the specific role of Pt in photocatalytic H2 evolution has not been thoroughly studied. In this paper, by employing three Pt sources with different charges (positive, negative and neutral), we systematically studied the charge effect of Pt sources on photocatalytic H2 evolution via TiO2 catalyst. According to the results of Raman, X-ray photoelectron spectroscopy (XPS), recycle experiments and photocurrent characterizations, it was found that TiO2 would produce electropositive defects during photocatalytic H2 evolution, inevitably leading to the decline of H2 production activity. Thanks to the electrostatic interaction, the electronegative Pt source not only promoted charge separation, but preferential deposited on electropositive defects, which acted as the defect repair agent, and thus resulted in the increased photocatalytic stability. This work may provide a new perspective for enhancing photocatalytic stability of hydrogen production.

scholarly journals Hydrothermal synthesis of high surface area CuCrO2 for H2 production by methanol steam reforming

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12607-12613
Author(s):  
Rong-Jun Huang ◽  
Subramanian Sakthinathan ◽  
Te-Wei Chiu ◽  
Chaofang Dong
Keyword(s):  
Hydrothermal Synthesis ◽  
Surface Area ◽  
Steam Reforming ◽  
High Surface ◽  
High Surface Area ◽  
H2 Production ◽  
Methanol Steam Reforming

Hydrothermal synthesis of CuCrO2 nanopowder for H2 production by methanol steam reforming.

scholarly journals Recent Advances on Properties and Utility of Nanomaterials Generated from Industrial and Biological Activities

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 634
Author(s):  
Virendra Kumar Yadav ◽  
Parth Malik ◽  
Afzal Husain Khan ◽  
Priti Raj Pandit ◽  
Mohd Abul Hasan ◽  
...  
Keyword(s):  
Environmental Remediation ◽  
Biological Activities ◽  
High Surface ◽  
High Surface Area ◽  
Cost Effective ◽  
Effective Technique ◽  
Cost Effective Technique ◽  
2D Nanomaterials ◽  
Synthesis Of Nanomaterials ◽  
Unique Chemical

Today is the era of nanoscience and nanotechnology, which find applications in the field of medicine, electronics, and environmental remediation. Even though nanotechnology is in its emerging phase, it continues to provide solutions to numerous challenges. Nanotechnology and nanoparticles are found to be very effective because of their unique chemical and physical properties and high surface area, but their high cost is one of the major hurdles to its wider application. So, the synthesis of nanomaterials, especially 2D nanomaterials from industrial, agricultural, and other biological activities, could provide a cost-effective technique. The nanomaterials synthesized from such waste not only minimize pollution, but also provide an eco-friendly approach towards the utilization of the waste. In the present review work, emphasis has been given to the types of nanomaterials, different methods for the synthesis of 2D nanomaterials from the waste generated from industries, agriculture, and their application in electronics, medicine, and catalysis.

scholarly journals Konversi katalitik n-butanol menjadi hidrokarbon Cr~C4 menggunakan katalis B2O3/zeolit alam

2018 ◽  
Vol 6 (2) ◽  
pp. 649
Author(s):  
S Setiadi ◽  
D Dariyus
Keyword(s):  
Surface Area ◽  
Active Site ◽  
Boron Oxide ◽  
Natural Zeolite ◽  
Fermentation Process ◽  
Oxide Catalyst ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Performance ◽  
Alkylation Reagent

C2~C4 hydrocarbons are important petrochemical feedstocks for polymer, MTBE, alkylation reagent and LPG. Those hydrocarbons can be produced sustainable from n­butanol through the catalytically reaction which can be produced renewably through a fermentation process. The development of catalytically can be done by using natural zeolite by adding boron oxide (B203.   The combination of these two catalyst's substance is hoped to increase  the catalytic performance  in converting  n-butanol  to hydrocarbon  of C2~C4 .This research has studied that addition boron oxide in natural zeolite as much as 25% gave the highest conversion (82,9%) and yield of C2~C4 (14,7% at 400°C}. No peaks due to the boron oxide catalyst on the XRD spectrum and the high surface area of natural zeolite (343 m2/g) strongly suggest that the boron oxide was dispersed perfectly on the surface of natural zeolite and interacted strongly with zeolite's frame. The formation of a new active site for converting n-butanol to hydrocarbon C2~C4 is highly considered which is more active comparing to natural zeolite or boron oxide itself.Keyword : n-butanol, hydrocarbon C2~C4, boron oxide, catalytic conversionAbstrakHidrokarbon  C2~C4  merupakan  senyawa  yang  penting  da/am  industri  kimia petrokimia misalnya  bahan baku po/imer,  MTBE,  untuk  alki/asi, senyawa  isookatana maupun LPG. Sampai   saat   ini, sumber   utama senyawa   hidrokarbon   tersebut   berasal   dari   hasi/ pengolahan minyak  bumi. Karena  semakin  menispisnya  cadangan  minyak  dunia,  maka dimasa depan kebergantungan  hidrokarbon  C2~C4  ini pada pasokan  minyak harus segera dicarikan  alternatif sumber  lainnya yang  lebih terjaga kesinambungannya.  Penelitian ini bermaksud menyajikan bahwa hidrokarbon C2~C4 dapat dipero/eh dari senyawa organik n­ butanol melalui reaksi katalitik menggunakan kata/is zeolit a/am. Proses ini sangat penting karena reaktan n-butanol merupakan suatu senyawa yang renewable (dapat diperbaharui) dari proses fermentasi.  Zeolit alam dimodifikasi dengan penambahan boron oksida dengan berbagai kadar. Hasil yang dipero/eh bahwa boron oksida berkandungan 25% memberikan hasif yang paling baik, dengan konversi butnao/  82,9 % dan yield  C2~C4  14,7 %  dengan suhu reaksi  400  °C Namun,  karakterisasi XRD  tidak  menunjukkan puncak-puncak yang dimiliki oleh komponen boron oksida. Hal ini menunjukkan bahwa boron oksida terdispersi secara sempurna pada permukaan zeo/it a/am (343 m2/g), berinteraksi secara kuat dengan frame kerangka  zeolit  dan terbentuknya spesi inti aktif baru hasil perpaduan  zeolit  alam maupun boron oksida yang lebih aktif da/am mengkonversi n-butanol menjadi C2~C4.Kata Kunci :n-butanol, hidrokarbon C2~C4, boron oksida, konversi katalitik

A new paradigm of ultrathin 2D nanomaterial adsorbents in aqueous media: graphene and GO, MoS2, MXenes, and 2D MOFs

2019 ◽  
Vol 7 (28) ◽  
pp. 16598-16621 ◽  
Author(s):  
Pin Zhao ◽  
Meipeng Jian ◽  
Qi Zhang ◽  
Rongming Xu ◽  
Ruiping Liu ◽  
...  
Keyword(s):  
Surface Area ◽  
Active Sites ◽  
High Performance ◽  
High Surface ◽  
Aqueous Media ◽  
High Surface Area ◽  
Atomic Level ◽  
New Paradigm ◽  
2D Nanomaterials

Due to the high surface area, atomic-level thickness, and abundant exposed active sites, 2D nanomaterials are regarded potential high-performance adsorbents. We review four representative nanomaterials, graphene, MoS2, MXenes, and MOFs, for this application.

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