scholarly journals Turning Waste into Wealth: Facile and Green Synthesis of Graphene Nanodots from Pollutants and Applications to Bioimaging

2021 ◽  
Author(s):  
Weifeng Chen ◽  
Jialu Shen ◽  
Zuo Wang ◽  
Yanyi Xu ◽  
Xiang Liu ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Industrial Wastewater ◽  
Organic Pollutant ◽  
Reactive Red 2 ◽  
First Time

In an effort to turn waste into wealth, Reactive Red 2 (RR2), a common and refractory organic pollutant in industrial wastewater, has been employed for the first time as precursor...

Green Synthesis and Spectroscopic Studies of Ag-rGO Nanocomposites for Highly Selective Mercury (II) Sensing

2018 ◽  
Vol 9 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Shubhangi J. Mane-Gavade ◽  
Sandip R. Sabale ◽  
Xiao-Ying Yu ◽  
Gurunath H. Nikam ◽  
Bhaskar V. Tamhankar
Keyword(s):  
Green Synthesis ◽  
Color Change ◽  
Limit Of Detection ◽  
Aqueous Media ◽  
Suitable Condition ◽  
Cost Effective ◽  
Spectroscopic Studies ◽  
Calibration Plot ◽  
First Time

Introduction: Herein we report the green synthesis and characterization of silverreduced graphene oxide nanocomposites (Ag-rGO) using Acacia nilotica gum for the first time. Experimental: We demonstrate the Hg2+ ions sensing ability of the Ag-rGO nanocomposites form aqueous medium. The developed colorimetric sensor method is simple, fast and selective for the detection of Hg2+ ions in aqueous media in presence of other associated ions. A significant color change was noticed with naked eye upon Hg2+ addition. The color change was not observed for cations including Sr2+, Ni2+, Cd2+, Pb2+, Mg2+, Ca2+, Fe2+, Ba2+ and Mn2+indicating that only Hg2+ shows a strong interaction with Ag-rGO nanocomposites. Under the most suitable condition, the calibration plot (A0-A) against concentration of Hg2+ was linear in the range of 0.1-1.0 ppm with a correlation coefficient (R2) value 0.9998. Results & Conclusion The concentration of Hg2+ was quantitatively determined with the Limit of Detection (LOD) of 0.85 ppm. Also, this method shows excellent selectivity towards Hg2+ over nine other cations tested. Moreover, the method offers a new cost effective, rapid and simple approach for the detection of Hg2+ in water samples.

scholarly journals Optimization of Green Synthesis of Silver Nanoparticles from Leaf Extracts ofPimenta dioica(Allspice)

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Akshay Rajeev Geetha ◽  
Elizabeth George ◽  
Akshay Srinivasan ◽  
Jameel Shaik
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Leaf Extract ◽  
Synthesis Method ◽  
Leaf Extracts ◽  
Synthesis Of Nanoparticles ◽  
Hot Air ◽  
Vis Spectroscopy ◽  
Pimenta Dioica ◽  
First Time

Production of silver nanoparticles from the leaf extracts ofPimenta dioicais reported for the first time in this paper. Three different sets of leaves were utilized for the synthesis of nanoparticles—fresh, hot-air oven dried, and sun-dried. These nanoparticles were characterized using UV-Vis spectroscopy and AFM. The results were diverse in that different sizes were seen for different leaf conditions. Nanoparticles synthesized using sun-dried leaves (produced using a particular ratio (1 : 0.5) of the leaf extract sample and silver nitrate (1 mM), resp.) possessed the smallest sizes. We believe that further optimization of the current green-synthesis method would help in the production of monodispersed silver nanoparticles having great potential in treating several diseases.

Degradation of organic pollutant in restaurant wastewater using the homogenous catalysis with Mn(II) and EDTA

2021 ◽  
Vol 10 (4) ◽  
pp. 46-51
Author(s):  
Tue Nguyen-Ngoc ◽  
Trung Nguyen-Duc
Keyword(s):  
Textile Industry ◽  
Industrial Wastewater ◽  
Plant Protection ◽  
Organic Pollutant ◽  
Paper Industry ◽  
Organic Pollution ◽  
Activation Process ◽  
Printing Industry ◽  
Transitional Metal ◽  
Restaurant Wastewater

It can be seen that the objects of wastewater that need to be treated are quite diverse in types and complex in terms of reaction mechanisms. The methods mainly focus on the treatment of toxic organic compounds, especially phenols or plant protection agents in industrial wastewater, paper industry, food production, textile industry, printing industry... The activation of H2O2 and O2 by complexes of transitional metal ions and suitable ligands creates oxidizing agents and ecologically healthy products. The intermediate substances arising in the activation process such as free radicals OH., O2., HO2., ... can oxidize many compounds, especially the ability to attack the aroma of organic pollutants. In this paper, the results of research on treating organic pollution in restaurant wastewater with H2O2 are presented as a catalyst of complexes between Mn2+ ions and EDTA. The conditions including pH, EDTA/Mn2+, the concentration of H2O2, Mn2+ were investigated to obtain the optimum conditions for improving COD treatment efficiency. This work proposes a method based on formation of the Mn(II)-EDTA complex,  b=1; with the optimal conditions of other factors as following [H2O2]0 = 0,75.10-3 mol/L; [Mn(EDTA)]2- = 33,33 mol/L, pH=10.5; t = 15 minutes. The initial COD of 1025 mg/L decreased to 135 mg/L after the proposed procedure.  The results provide solutions of homogeneous complex catalysts for domestic/restaurant and industrial wastewater treatment at room temperature and atmosphere.

scholarly journals Study on printing wastewater treatment by decomposition reaction H2O2 catalyzed of complex between ion Ni2+ and citric acid

2020 ◽  
Vol 9 (4) ◽  
pp. 106-110
Author(s):  
Tue Nguyen Ngoc ◽  
Nghia Nguyen Trong ◽  
Thuong Nghiem Thi ◽  
Quang Tran Thuong ◽  
Trung Nguyen Duc
Keyword(s):  
Wastewater Treatment ◽  
Citric Acid ◽  
Industrial Wastewater ◽  
Room Temperature ◽  
Organic Pollutant ◽  
Decomposition Reaction ◽  
Efficient Treatment ◽  
Catalytic Role ◽  
Printing Processes

In this article, the results of the research on organic pollutant treatment in the wastewater of printing processes on fabric by H2O2 under the catalytic role of the complex between ion Ni2+ and Citric acid (H4L) were presented. The condition of pH, H4L/Ni2+, H2O2, Ni2+ concentration has been explored to get the optimal conditions for improving COD efficient treatment. The results provide the solutions of the homogeneous complex  catalysts in the industrial wastewater treatment at room temperature and atmosphere. 

Green synthesis of fluorescent carbon quantum dots for the detection of mercury(ii) and glutathione

2018 ◽  
Vol 42 (8) ◽  
pp. 5814-5821 ◽  
Author(s):  
Daraksha Bano ◽  
Vijay Kumar ◽  
Vikas Kumar Singh ◽  
Syed Hadi Hasan
Keyword(s):  
Quantum Dots ◽  
Green Synthesis ◽  
Carbon Quantum Dots ◽  
First Time ◽  
Fluorescent Carbon

On–off–on detection of Hg2+ and GSH using green-synthesized CQDs from T. indica leaves for the first time.

scholarly journals Green synthesis of TiO2 nanoparticles from Syzygium cumini extract for photo-catalytic removal of lead (Pb) in explosive industrial wastewater

2020 ◽  
Vol 9 (1) ◽  
pp. 171-181 ◽  
Author(s):  
Naresh Kumar Sethy ◽  
Zeenat Arif ◽  
Pradeep Kumar Mishra ◽  
Pradeep Kumar
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Green Synthesis ◽  
Industrial Wastewater ◽  
Anatase Phase ◽  
Bet Surface Area ◽  
Lead Removal ◽  
Syzygium Cumini ◽  
X Ray ◽  
Catalytic Removal

AbstractGreen synthesis is a simple, non-toxic, economical and eco-friendly approach for the synthesis of nanoparticles. In the present work, nanoparticles of titanium dioxide (TiO2 NPs) were synthesized using an aqueous solution of Syzygium cumini leaf extract as a capping agent. These green synthesized TiO2 NPs were further evaluated for photo catalytic removal of lead from industrial wastewater. Obtained nanoparticles were characterized using: high-resolution scanning electron microscopy (HRSEM), high-resolution transmission electron microscopy (HRTEM), X-ray energy dispersive spectroscopy (EDS), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), dynamic light scattering (DLS) and Brunauer-Emmett-Teller (BET). Obtained results revealed that synthesized TiO2 NPs possess spherical morphology with anatase phase with a large BET surface area of 105 m2/g. Photo catalytic studies of TiO2 NPs for lead removal from explosive wastewater were performed in a self-designed reactor. Inductive coupled plasma spectroscopy (ICP) was used to determine the lead concentration. Obtained results witnessed 75.5% removal in chemical oxygen demand (COD) and 82.53% removal in lead (Pb2+). This application of green TiO2 NPs is being explored for the first time.

scholarly journals Green synthesis of a AgCl@AgI nanocomposite using Laminaria japonica extract and its application as a visible-light-driven photocatalyst

RSC Advances ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 5858-5864 ◽  
Author(s):  
Zhongyu Ruan ◽  
Guihong Liu ◽  
Jinxia Shu ◽  
Chunguang Ren ◽  
Zhonghua Wang
Keyword(s):  
Visible Light ◽  
Green Synthesis ◽  
Organic Pollutant ◽  
Laminaria Japonica ◽  
Pollutant Degradation ◽  
Organic Pollutant Degradation ◽  
Visible Light Driven

A AgCl@AgI nanocomposite was greenly synthesized with Laminaria japonica extract and applied as a visible-light-driven photocatalyst for organic pollutant degradation.

Application of Pd/C Catalyst to Degradation and Utilization of Nitrobenzene in Water

2011 ◽  
Vol 287-290 ◽  
pp. 1691-1695
Author(s):  
Qun Feng Zhang ◽  
Yao Ming Ju ◽  
Lei Ma ◽  
Chun Shan Lu ◽  
Xiao Nian Li
Keyword(s):  
Hydrogen Production ◽  
Industrial Wastewater ◽  
Organic Pollutant ◽  
Reaction Conditions ◽  
Aqueous Phase Reforming ◽  
Initial Concentration ◽  
Oxygenated Hydrocarbons ◽  
Novel Method ◽  
Degradation Degree ◽  
Optimal Reaction

Nitrobenzene(NB) is a highly toxic and resistant to degradation organic pollutant which has been widely distributed in industrial wastewater. Much more attentions on the degradation of NB have been attracted to achieve the effectively removal of organic pollutant. Based on the hydrogen production from aqueous-phase reforming (APR) of oxygenated hydrocarbons reported by Dumesic, a novel method for the catalytic degradation of NB by APR reaction in wastewater has been proposed in this study. The effects of reaction conditions, such as temperature, the initial concentration of NB were investigated over Pd/C catalyst. The experimental results indicated that the degradation degree of NB could reach 100% (NB could be degraded completely) under optimal reaction conditions: 0.75 g 5% Pd/C, 2000 mg/L NB, T = 493 K, P = 3 MPa, t = 6 h under the atmosphere of Ar with a stirring speed of 950 r/min. The deactivation of Pd/C catalyst had not been observed after being reused for 12 recycles (the degradation degree of NB was more than 97%).

Adsorption of Aniline Using Novel Mesoporous Carbon Nitride

2014 ◽  
Vol 925 ◽  
pp. 135-139 ◽  
Author(s):  
Mei Shie Sam ◽  
Hendrik O. Lintang ◽  
Mohd Marsin Sanagi ◽  
Siew Ling Lee ◽  
Leny Yuliati
Keyword(s):  
Surface Area ◽  
Mesoporous Carbon ◽  
Carbon Nitride ◽  
Adsorption Process ◽  
Organic Pollutant ◽  
Comparison Study ◽  
Adsorption Sites ◽  
First Time ◽  
Mesoporous Carbon Nitride ◽  
Mcm 41

Aniline is a toxic organic pollutant that is abundantly present in the environment. One of approaches to remove the aniline is by adsorption process. In this study, mesoporous carbon nitride (MCN) was proposed for the first time to be a potential adsorbent for aniline. The adsorption studies were carried out at room temperature on the aniline solution with various initial concentrations for both bulk carbon nitride (BCN) and MCN. Owing to its larger surface area, the MCN showed much higher adsorption capacity towards aniline compared to the BCN. This result indicated that adsorbent with large surface area is very crucial in the adsorption of aniline. Comparison study was also carried out using mesoporous silica, MCM-41, which was reported to act as a good adsorbent for aniline. The adsorption capability of MCN was found to be higher than that of MCM-41. It was suggested that the MCN with larger pore diameter might have more suitable and favourable adsorption sites for aniline compared to MCM-41. This study obviously showed that MCN would be a new potential adsorbent for removal of aniline.

Sign in / Sign up

Export Citation Format

Share Document