scholarly journals Enhancement of chromate reduction in soils by surface modified biochar

2017 ◽  
Vol 186 ◽  
pp. 277-284 ◽  
Author(s):  
Sanchita Mandal ◽  
Binoy Sarkar ◽  
Nanthi Bolan ◽  
Yong Sik Ok ◽  
Ravi Naidu
Keyword(s):  
Chromate Reduction ◽  
Modified Biochar ◽  
Surface Modified

Surface-modified biochar in a bioretention system for Escherichia coli removal from stormwater

Chemosphere ◽  
2017 ◽  
Vol 169 ◽  
pp. 89-98 ◽  
Author(s):  
Abbe Y.T. Lau ◽  
Daniel C.W. Tsang ◽  
Nigel J.D. Graham ◽  
Yong Sik Ok ◽  
Xin Yang ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Bioretention System ◽  
Modified Biochar ◽  
Surface Modified

Utility of Surface-Modified Biochar for Sequestration of Heavy Metals in Water

2021 ◽  
pp. 27-48
Author(s):  
E. Parameswari ◽  
R. Kalaiarasi ◽  
V. Davamani ◽  
T. Ilakiya ◽  
P. Kalaiselvi ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Modified Biochar ◽  
Surface Modified

scholarly journals Surface-Modified Biochar with Polydentate Binding Sites for the Removal of Cadmium

2019 ◽  
Vol 20 (7) ◽  
pp. 1775 ◽  
Author(s):  
Rongqi Chen ◽  
Xi Zhao ◽  
Juan Jiao ◽  
Yan Li ◽  
Min Wei
Keyword(s):  
Photoelectron Spectroscopy ◽  
Disulfide Bonds ◽  
Selective Adsorption ◽  
Isotherm Models ◽  
Infrared Spectrometry ◽  
Maximum Adsorption Capacity ◽  
Disulfide Linkage ◽  
Modified Biochar ◽  
Before And After ◽  
Surface Modified

In this study, a surface chemical-modified rice husk biochar with abundant amino groups and disulfide bonds for the removal of cadmium was prepared using cystamine dihydrochloride as a modification ligand and glutaraldehyde as a crosslinker. The biochars were characterized by Fourier transform infrared spectrometry (FTIR), elemental analysis, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetry analysis (TGA), and nitrogen sorption (BET) before and after modification. The adsorption properties of the modified biochars for Cd (II) were investigated in detail via adsorption isotherm models, adsorption kinetics models, and selective adsorption experiments. The surfaces of the cystamine-modified biochars with granular nanopolymers of sufficient functional groups of primary amine and disulfide linkage rendered the biochar surface more conducive to electrostatic attraction and surface complexation. The theoretical maximum adsorption capacity of the modified biochars (81.02 mg g−1) was almost 10-fold greater than that of the raw biochars (8.347 mg g−1) for Cd (II). Besides, the cystamine-modified biochars had a better affinity for Cd (II) compared to other heavy metals (Zn, As, Cd, Co, Ni, Cr), showing six-fold greater affinity for Cd (II) than Zn2+. The results of this study indicate that the modification of biochars derived from rice husks shows great potential in the removal of Cd (II) from contaminated water.

Analytical Electron Microscopy of Surface-Modified Ceramics

1985 ◽  
Vol 43 ◽  
pp. 276-279
Author(s):  
P. S. Sklad
Keyword(s):  
Electron Microscopy ◽  
Analytical Electron Microscopy ◽  
Theoretical Models ◽  
Ceramic Materials ◽  
Solute Concentration ◽  
Second Phase ◽  
Analytical Electron ◽  
Implantation Techniques ◽  
Lattice Damage ◽  
Surface Modified

Over the past several years, it has become increasingly evident that materials for proposed advanced energy systems will be required to operate at high temperatures and in aggressive environments. These constraints make structural ceramics attractive materials for these systems. However it is well known that the condition of the specimen surface of ceramic materials is often critical in controlling properties such as fracture toughness, oxidation resistance, and wear resistance. Ion implantation techniques offer the potential of overcoming some of the surface related limitations.While the effects of implantation on surface sensitive properties may be measured indpendently, it is important to understand the microstructural evolution leading to these changes. Analytical electron microscopy provides a useful tool for characterizing the microstructures produced in terms of solute concentration profiles, second phase formation, lattice damage, crystallinity of the implanted layer, and annealing behavior. Such analyses allow correlations to be made with theoretical models, property measurements, and results of complimentary techniques.

Experimental and Theoretical Comparable Study of Pure and Zinc Porphyrin Surface Modified ZnO Nanorod Arrays for Hybrid Solar Cell Applications

2020 ◽  
pp. 114-119
Keyword(s):  
Solar Cell ◽  
Electrochemical Impedance ◽  
Hybrid Solar Cell ◽  
Cell Performance ◽  
Solar Cell Performance ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Annealing Effects ◽  
Vertically Aligned ◽  
Surface Modified

Experimental and theoretical study Porphyrin-grafted ZnO nanowire arrays were investigated for organic/inorganic hybrid solar cell applications. Two types of porphyrin – Tetra (4-carboxyphenyle) TCPP and meso-Tetraphenylporphine (Zinc-TPP)were used to modify the nanowire surfaces. The vertically aligned nanowires with porphyrin modifications were embedded in graphene-enriched poly (3-hexylthiophene) [G-P3HT] for p-n junction nanowire solar cells. Surface grafting of ZnO nanowires was found to improve the solar cell efficiency. There are different effect for the two types of porphyrin as results of Zn existing. Annealing effects on the solar cell performance were investigated by heating the devices up to 225 °C in air. It was found that the cell performance was significantly degraded after annealing. The degradation was attributed to the polymer structural change at high temperature as evidenced by electrochemical impedance spectroscopy measurements.

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