Removal of phosphate and chromium(vi) from liquids by an amine-crosslinked nano-Fe3O4 biosorbent derived from corn straw

RSC Advances ◽  
2016 ◽  
Vol 6 (53) ◽  
pp. 47237-47248 ◽  
Author(s):  
Hantao Wang ◽  
Xing Xu ◽  
Zhongfei Ren ◽  
Baoyu Gao
Keyword(s):  
Amine Functionalization ◽  
Corn Straw ◽  
Chromium Vi ◽  
Nano Fe3o4 ◽  
Co Precipitation

A magnetic biocomposite based bio-sorbent (corn straw) was prepared after in situ co-precipitation with Fe2+ and Fe3+ solutions and amine functionalization.

Adsorption of phosphate on surface of magnetic reed: characteristics, kinetic, isotherm, desorption, competitive and mechanistic studies

RSC Advances ◽  
2016 ◽  
Vol 6 (6) ◽  
pp. 5089-5099 ◽  
Author(s):  
Tiantian Wang ◽  
Xing Xu ◽  
Zhongfei Ren ◽  
Baoyu Gao ◽  
Hantao Wang
Keyword(s):  
Starting Material ◽  
Amine Functionalization ◽  
Mechanistic Studies ◽  
Co Precipitation

A magnetic biocomposite was prepared by Fe3O4in situ co-precipitation and amine functionalization processes by using virgin reed as starting material.

scholarly journals A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 536
Author(s):  
Mosab Kaseem ◽  
Karna Ramachandraiah ◽  
Shakhawat Hossain ◽  
Burak Dikici
Keyword(s):  
Industrial Applications ◽  
Mg Alloys ◽  
Anodic Films ◽  
Electrolytic Oxidation ◽  
Recent Developments ◽  
Plasma Electrolytic ◽  
Co Precipitation ◽  
Corrosive Environments ◽  
Double Hydroxide

This review presents an overview of the recent developments in the synthesis of layered double hydroxide (LDH) on the anodized films of Mg alloys prepared by either conventional anodizing or plasma electrolytic oxidation (PEO) and the applications of the formed composite ceramics as smart chloride traps in corrosive environments. In this work, the main fabrication approaches including co-precipitation, in situ hydrothermal, and an anion exchange reaction are outlined. The unique structure of LDH nanocontainers enables them to intercalate several corrosion inhibitors and release them when required under the action of corrosion-relevant triggers. The influences of different variables, such as type of cations, the concentration of salts, pH, and temperature, immersion time during the formation of LDH/anodic film composites, on the electrochemical response are also highlighted. The correlation between the dissolution rate of PEO coating and the growth rate of the LDH film was discussed. The challenges and future development strategies of LDH/anodic films are also highlighted in terms of industrial applications of these materials.

scholarly journals Phase Transition and Coefficients of Thermal Expansion in Al2−xInxW3O12 (0.2 ≤ x ≤ 1)

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4021
Author(s):  
Andrés Esteban Cerón Cerón Cortés ◽  
Anja Dosen ◽  
Victoria L. Blair ◽  
Michel B. Johnson ◽  
Mary Anne White ◽  
...  
Keyword(s):  
Phase Transition ◽  
Thermal Expansion ◽  
Thermal Shock ◽  
Monoclinic Phase ◽  
Ceramic Materials ◽  
Precipitation Method ◽  
Scanning Calorimetry ◽  
Orthorhombic Crystal ◽  
Co Precipitation

Materials from theA2M3O12 family are known for their extensive chemical versatility while preserving the polyhedral-corner-shared orthorhombic crystal system, as well as for their consequent unusual thermal expansion, varying from negative and near-zero to slightly positive. The rarest are near-zero thermal expansion materials, which are of paramount importance in thermal shock resistance applications. Ceramic materials with chemistry Al2−xInxW3O12 (x = 0.2–1.0) were synthesized using a modified reverse-strike co-precipitation method and prepared into solid specimens using traditional ceramic sintering. The resulting materials were characterized by X-ray powder diffraction (ambient and in situ high temperatures), differential scanning calorimetry and dilatometry to delineate thermal expansion, phase transitions and crystal structures. It was found that the x = 0.2 composition had the lowest thermal expansion, 1.88 × 10−6 K−1, which was still higher than the end member Al2W3O12 for the chemical series. Furthermore, the AlInW3O12 was monoclinic phase at room temperature and transformed to the orthorhombic form at ca. 200 °C, in contrast with previous reports. Interestingly, the x = 0.2, x = 0.4 and x = 0.7 materials did not exhibit the expected orthorhombic-to-monoclinic phase transition as observed for the other compositions, and hence did not follow the expected Vegard-like relationship associated with the electronegativity rule. Overall, compositions within the Al2−xInxW3O12 family should not be considered candidates for high thermal shock applications that would require near-zero thermal expansion properties.

scholarly journals Sustainable Chromium (VI) Removal from Contaminated Groundwater Using Nano-Magnetite-Modified Biochar via Rapid Microwave Synthesis

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 103
Author(s):  
Xiaoming Song ◽  
Yuewen Zhang ◽  
Nan Cao ◽  
Dong Sun ◽  
Zhipeng Zhang ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Microwave Treatment ◽  
Contaminated Groundwater ◽  
Maximum Adsorption Capacity ◽  
Intraparticle Diffusion Model ◽  
Adsorption Mechanisms ◽  
Chromium Vi ◽  
Modified Biochar ◽  
Pseudo Second Order ◽  
Nano Fe3o4

This study developed a nano-magnetite-modified biochar material (m-biochar) using a simple and rapid in situ synthesis method via microwave treatment, and systematically investigated the removal capability and mechanism of chromium (VI) by this m-biochar from contaminated groundwater. The m-biochar was fabricated from reed residues and magnetically modified by nano-Fe3O4. The results from scanning electron microscopy (SEM) and X-ray diffraction (XRD) characterisations confirmed the successful doping of nano-Fe3O4 on the biochar with an improved porous structure. The synthesised m-biochar exhibited significantly higher maximum adsorption capacity of 9.92 mg/g compared with that (8.03 mg/g) of the pristine biochar. The adsorption kinetics followed the pseudo-second-order model and the intraparticle diffusion model, which indicated that the overall adsorption rate of Cr(VI) was governed by the processes of chemical adsorption, liquid film diffusion and intramolecular diffusion. The increasing of the pH from 3 to 11 significantly affected the Cr(VI) adsorption, where the capabilities decreased from 9.92 mg/g to 0.435 mg/g and 8.03 mg/g to 0.095 mg/g for the m-biochar and pristine biochar, respectively. Moreover, the adsorption mechanisms of Cr(VI) by m-biochar were evaluated and confirmed to include the pathways of electrostatic adsorption, reduction and complexation. This study highlighted an effective synthesis method to prepare a superior Cr(VI) adsorbent, which could contribute to the effective remediation of heavy metal contaminations in the groundwater.

Studies on Adsorption Performance of Reactive Dye Remazol Navy RGB (RN-RGB) via Epoxide Functional Magnetic ?-Al2O3 Nanocomposite Particles

2017 ◽  
Vol 9 (4) ◽  
pp. 421-429
Author(s):  
S. S. Bristy ◽  
H. Ahmad
Keyword(s):  
Sol Gel ◽  
Reactive Dye ◽  
Al2o3 Nanoparticles ◽  
Silica Layer ◽  
Seeded Polymerization ◽  
Nanocomposite Particles ◽  
Adsorption Performance ◽  
Magnetite Fe3o4 ◽  
Co Precipitation

The nanocomposite particles named as ?-Al2O3/Fe3O4/SiO2/poly(glycidyl methacrylate) or ?-Al2O3/Fe3O4/SiO2/PGMA were prepared by multi-step process. At first, ?- Al2O3 nanoparticles were prepared by sol-gel method. Magnetite, Fe3O4, nanoparticles were then precipitated by in situ co-precipitation in presence of ?-Al2O3 particles, followed by incorporation of mesoporous silica layer using Stöber process. Finally, the surface of the ?-Al2O3/Fe3O4/SiO2 nanocomposite particles was modified by seeded polymerization of GMA using free radical polymerization. The surface modification, morphology and size distribution of the prepared nanocomposite particles were confirmed by FTIR, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The adsorption capacity of ?-Al2O3/Fe3O4/SiO2/PGMA nanocomposite particles was evaluated using remazol navy RGB (RN-RGB) as a model dye.

Treated sugarcane bagasse for maintenance of sheep in Brazil

1996 ◽  
Vol 1996 ◽  
pp. 172-172
Author(s):  
A.L. Abdalla ◽  
D.M.S.S. Vitti ◽  
N.L. del Mastro ◽  
M.S. Bueno
Keyword(s):  
Body Weight ◽  
Sugarcane Bagasse ◽  
Present Experiment ◽  
Dry Matter ◽  
Weight Changes ◽  
Corn Straw ◽  
Microbial Synthesis ◽  
Body Weight Changes ◽  
Wool Production

Several treatments for increasing digestibility of sugarcane bagasse (SCB) have been studied in Brazil for many years (Abdalla et al., 1990). Despite some improvements in in situ digestibility obtained with steam and pressure treatments, the SCB has not performed well when given to cattle (Mello Junior, et al., 1989). More recently, irradiation and ammonia has been tested in studies to improve the digestibility of SCB, rice and corn straw, rice and soybean hulls and others rough feed. The purpose of the present experiment was aimed to determine the intake, body weight changes, wool production and microbial synthesis in sheep fed with grass hay (Cynodon dactilon) or SCB treated with 600kGy of radiation and ammonia (20g/kg dry matter (DM)).

scholarly journals A Green Microbial Fuel Cell-Based Biosensor for In Situ Chromium (VI) Measurement in Electroplating Wastewater

Sensors ◽  
2017 ◽  
Vol 17 (11) ◽  
pp. 2461 ◽  
Author(s):  
Li-Chun Wu ◽  
Teh-Hua Tsai ◽  
Man-Hai Liu ◽  
Jui-Ling Kuo ◽  
Yung-Chu Chang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Electroplating Wastewater ◽  
Chromium Vi

scholarly journals Construction of in situ degradation bacteria of corn straw and analysis of its degradation efficiency

2020 ◽  
Vol 70 (1) ◽  
Author(s):  
Xiujie Gong ◽  
Hongtao Zou ◽  
Chunrong Qian ◽  
Yang Yu ◽  
Yubo Hao ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Degradation Efficiency ◽  
Corn Straw ◽  
X Ray ◽  
In Situ Degradation ◽  
Infrared Spectrometer ◽  
Scanning Electron

Abstract Purpose The highly efficient degradation bacteria were selected from the humus from the very cold straw in China for many years to construct the in situ degradation bacteria, and the degradation efficiency of corn straw was determined by process optimization. Methods According to the main components of corn straw, through morphological, physiological, and biochemical screening, three highly efficient complementary degradation strains were selected to construct the compound flora, and the degradation efficiency was analyzed by Fourier transform infrared spectrometer, field emission scanning electron microscope, and X-ray diffractometer. Result The corn straw selected in this paper is mainly composed of cellulose (31.99%), hemicellulose (25.33%), and lignin (14.67%). Through the determination of enzyme activity, strain Streptomyces sp. G1T has high decomposition ability to cellulose and hemicellulose but weak utilization ability to lignin; strain Streptomyces sp. G2T has the strongest decomposition ability to cellulose and hemicellulose among the three strains. The decomposition ability of strain Streptomyces sp. G3T to lignin was the strongest among the three strains. Therefore, by compounding the three strains, the decomposition ability has been greatly improved. The optimal process conditions obtained by single factor and response surface method are as follows: pH is 7, temperature is 30 °C, inoculation amount is 5%, rotational speed is 210 rpm, and the weight loss rate of straw is 60.55% after decomposing for 7 days. A large amount of degradation of corn straw can be seen by Fourier transform infrared spectrometer, field emission scanning electron microscope, and X-ray diffractometer. Conclusion Streptomyces sp. G1T, Streptomyces sp. G2T, and Streptomyces sp. G3T screened from straw humus in very cold areas were used to construct in situ degradation bacteria, which had good straw degradation activity and had the potential to be used for straw treatment in cold areas after harvest. This characteristic makes the complex bacteria become a strong competitive candidate for industrial production, and it is also an effective biotechnology in line with the current recycling of resources.

Sign in / Sign up

Export Citation Format

Share Document