scholarly journals Removal of arsenic from contaminated water utilizing tea waste

2016 ◽  
Vol 13 (3) ◽  
pp. 843-848 ◽  
Author(s):  
I. Hossain ◽  
N. Anjum ◽  
T. Tasnim
Keyword(s):  
Contaminated Water ◽  
Tea Waste ◽  
Removal Of Arsenic

scholarly journals Electrospun chitosan–polyvinyl alcohol composite nanofibers loaded with cerium for efficient removal of arsenic from contaminated water

2014 ◽  
Vol 2 (39) ◽  
pp. 16669-16677 ◽  
Author(s):  
Reena Sharma ◽  
Nahar Singh ◽  
Ashish Gupta ◽  
Sangeeta Tiwari ◽  
Sandeep Kumar Tiwari ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Composite Nanofibers ◽  
Contaminated Water ◽  
Efficient Removal ◽  
Electrospinning Technique ◽  
Removal Of Arsenic

Cerium-PVA/CHT nanofibers prepared through electrospinning technique have demonstrated 80% removal of Arsenic from contaminated water within the initial 10 minutes.

scholarly journals Hybrid Beads of Zero Valent Iron Oxide Nanoparticles and Chitosan for Removal of Arsenic in Contaminated Water

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2876
Author(s):  
Mian Fawaz Ahmed ◽  
Muhammad Asad Abbas ◽  
Azhar Mahmood ◽  
Nasir M. Ahmad ◽  
Hifza Rasheed ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Ph Value ◽  
Zero Valent Iron ◽  
Polluted Water ◽  
Oxide Nanoparticles ◽  
Contaminated Water ◽  
Contact Period ◽  
Removal Of Arsenic ◽  
Optimized Conditions

Water contaminated with highly hazardous metals including arsenic (As) is one of the major challenges faced by mankind in the present day. To address this pressing issue, hybrid beads were synthesized with various concentrations of zero valent iron oxide nanoparticles, i.e., 20% (FeCh-20), 40% (FeCh-40) and 60% (FeCh-60) impregnated into a polymer of chitosan. These hybrid beads were employed as an adsorbent under the optimized conditions of pH and time to facilitate the efficient removal of hazardous arsenic by adsorption cum reduction processes. X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), Brunauer- Emmett-Teller BET, a porosity test and wettability analysis were performed to characterize these hybrid beads. The porosity and contact angle of the prepared hybrid beads decreased with an increase in nanoparticle concentration. The effects of various adsorption factors such as adsorbent composition, contact period, pH value and the initial adsorbate concentration were also evaluated to study the performance of these beads for arsenic treatment in contaminated water. FeCh-20, FeCh-40 and FeCh-60 have demonstrated 63%, 81% and 70% removal of arsenic at optimized conditions of pH 7.4 in 10 h, respectively. Higher adsorption of arsenic by FeCh-40 is attributed to its optimal porosity, hydrophilicity and the presence of appropriate nanoparticle contents. The Langmuir adsorption kinetics described the pseudo second order. Thus, the novel beads of FeCh-40 developed in this work are a potent candidate for the treatment of polluted water contaminated with highly toxic arsenic metals.

scholarly journals Modification of tea biochar with Mg, Fe, Mn and Al salts for efficient sorption of PO43− and Cd2+ from aqueous solutions

2018 ◽  
Vol 9 (1) ◽  
pp. 57-66 ◽  
Author(s):  
Gökçen Akgül ◽  
Tuğba Bolat Maden ◽  
Elena Diaz ◽  
Eduardo Moreno Jiménez
Keyword(s):  
Aqueous Solutions ◽  
Low Cost ◽  
Adsorption Properties ◽  
Pollutant Removal ◽  
Metal Salts ◽  
Contaminated Water ◽  
Surface Functionality ◽  
Inorganic Pollutant ◽  
Tea Waste

Abstract There is a requirement to provide more efficient, sensitive, low-cost materials for remediation of contaminated water. Biochar as a sorbent is an effective and low-cost material to remove contaminants in water but its adsorption properties can be improved by impregnation of metals on the surface. In this study, a biochar derived from industrial tea waste was modified with Mg, Fe, Mn and Al salts to create different composites, which were tested for PO43− and Cd2+ sorption. The modifications created biochars with the (hydr)oxides of each metal and changed the characterization parameters and surface functionality. Cd2+ was efficiently removed by all the materials even at high Cd2+ loadings in the water (100 mg Cd2+ L−1), the biochar with Mg being the most efficient in Cd2+ removal. The biochar with Mg also achieved the best sorption of PO43−, sorbing up to 30% at 20 mg PO43− L−1. Tea waste biochar can be modified with metal salts to enhance inorganic pollutant removal from waters, especially with Mg salts.

scholarly journals Enhanced As (V) Removal from Aqueous Solution by Biochar Prepared from Iron-Impregnated Corn Straw

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Jiaming Fan ◽  
Xin Xu ◽  
Qunli Ni ◽  
Qi Lin ◽  
Jing Fang ◽  
...  
Keyword(s):  
Chemical Extraction ◽  
Contaminated Water ◽  
Iron Oxyhydroxide ◽  
Corn Straw ◽  
Surface Complexes ◽  
Amorphous Iron ◽  
Fe Oxides ◽  
Surface Areas ◽  
Ph Range ◽  
Removal Of Arsenic

Fe-loaded adsorbents have received increasing attention for the removal of arsenic in contaminated water or soil. In this study, Fe-loaded biochar was prepared from iron-impregnated corn straw under a pyrolysis temperature of 600°C. The ratio of crystalline Fe oxides including magnetite and natrojarosite to amorphous iron oxyhydroxide in the composite was approximately 2 : 3. Consisting of 24.17% Fe and 27.76% O, the composite exhibited a high adsorption capacity of 14.77 mg g−1 despite low surface areas (4.81 m2 g−1). The pH range of 2.0–8.0 was optimal for arsenate removal and the adsorption process followed the Langmuir isotherms closely. In addition, pseudo-second-order kinetics best fit the As removal data. Fe oxide constituted a major As-adsorbing sink. Based on the X-ray diffraction spectra, saturation indices, and selective chemical extraction, the data suggested three main mechanisms for arsenate removal: sorption of arsenate, strong inner-sphere surface complexes with amorphous iron oxyhydroxide, and partial occlusion of arsenate into the crystalline Fe oxides or carbonized phase. The results indicated that the application of biochar prepared from iron-impregnated corn straw can be an efficient method for the remediation of arsenic contaminated water or soil.

scholarly journals Fe3O4-Functionalized Boron Nitride Nanosheets as Novel Adsorbents for Removal of Arsenic(III) from Contaminated Water

ACS Omega ◽  
2020 ◽  
Vol 5 (18) ◽  
pp. 10301-10314
Author(s):  
Raghubeer S. Bangari ◽  
Vivek K. Yadav ◽  
Jayant K. Singh ◽  
Niraj Sinha
Keyword(s):  
Boron Nitride ◽  
Contaminated Water ◽  
Boron Nitride Nanosheets ◽  
Removal Of Arsenic
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