Low-cost and high-efficiency metallurgical copper slag@polyaniline core–shell composite as an adsorbent for the removal of Cr(VI) from aqueous solution

2021 ◽  
Vol 851 ◽  
pp. 156741
Author(s):  
Yubo Wu ◽  
Haifeng Li ◽  
Zelin Zhao ◽  
Xialin Yi ◽  
Dongdong Deng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
High Efficiency ◽  
Low Cost ◽  
Copper Slag ◽  
Core Shell ◽  
Shell Composite

Preparation and enhanced photoelectrochemical performance of selenite-sensitized zinc oxide core/shell composite structure

2015 ◽  
Vol 3 (8) ◽  
pp. 4239-4247 ◽  
Author(s):  
Tiantian Hong ◽  
Zhifeng Liu ◽  
Hui Liu ◽  
Junqi Liu ◽  
Xueqi Zhang ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Ion Exchange ◽  
Chemical Synthesis ◽  
Water Splitting ◽  
Low Cost ◽  
Core Shell ◽  
Nanorod Arrays ◽  
Photoelectrochemical Performance ◽  
Vertically Aligned ◽  
Shell Composite

A fast, versatile and low-cost hydrothermal chemical synthesis based on ion-exchange has been used to deposit a shell of cupric selenite onto vertically aligned zinc oxide nanorod arrays with a buffer layer of zinc selenite for photoelectrochemical water splitting.

Magnetic poly-o-vanillin functionalized core-shell nanomaterials as a smart sorbent for scavenging of mercury (II) from aqueous solution

2021 ◽  
Author(s):  
Lin Qian ◽  
Zheng Zeng ◽  
Shuyuan Zhang ◽  
Kai Xia ◽  
Yongfu Guo
Keyword(s):  
Aqueous Solution ◽  
Shell Structure ◽  
Magnetic Nanoparticle ◽  
Low Cost ◽  
Core Shell ◽  
Rapid Removal ◽  
Core Shell Structure

In the present work, a poly-o-vanillin-functionalized magnetic nanoparticle of PoVan/CoFe2O4@mSiO2 with core-shell structure was synthesized through a facile，green and low cost method. The rapid removal of Hg(II) by the prepared...

scholarly journals Semiconductor Photocatalyst of Tin Oxide Quantum Dots Prepared in Aqueous Solution for Degradation of Organic Pollutants in Contaminated Water

2021 ◽  
Author(s):  
Jianqiao LIU ◽  
Ye HONG ◽  
Xinyue TIAN ◽  
Xiangxu MENG ◽  
Ge GAO ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
High Efficiency ◽  
Low Cost ◽  
Contaminated Water ◽  
Long Term Stability ◽  
High Concentrations ◽  
Average Size ◽  
Source Materials

Stannous chloride and thiourea are used as source materials to prepare SnO2 quantum dots in the aqueous solution by a facile hydrolysis-oxidation process. The quantum dots have an average size of 1.9 nm with good dispersibility as well as long-term stability, and are validated to be an effective photocatalyst for the degradation of organic oil pollutants in contaminated water. The pollutant is removed by the quantum dots exposed to ultraviolet-visible irradiation at room temperature. The optimized condition is concluded to be a solution with quantum dot concentration of 10-3 mol/L and the degradation speed reaches the maximum at the 12 th hour after irradiation. After 48 hours, 91.9 % of octane is removed, concluding a high degradation efficiency. The prepared SnO2 quantum dots are potentially applicable in the remediation of marine environment as they hold the advantages of high efficiency, low cost and being environmental-friendly. The promotion and inhibition mechanisms of the photocatalytic SnO2 QDs at low and high concentrations are discussed.

scholarly journals Facile preparation and highly efficient sorption of magnetic composite graphene oxide/Fe3O4/GC for uranium removal

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aili Yang ◽  
Zhijun Wang ◽  
Yukuan Zhu
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
High Efficiency ◽  
Removal Rate ◽  
Low Cost ◽  
Hydrothermal Carbonization ◽  
Maximum Adsorption Capacity ◽  
Magnetic Composite ◽  
Order Kinetic

AbstractIn this work, we reported for the first time a novel magnetic composite graphene oxide/Fe3O4/glucose-COOH (GO/Fe3O4/GC) that was facilely prepared from glucose through the hydrothermal carbonization and further combination with graphene oxide (GO). The chemical and structural properties of the samples were investigated. By the batch uranium adsorption experiments, the magnetic composite GO/Fe3O4/GC exhibits an excellent adsorption performance and fast solid–liquid separation for uranium from aqueous solution. GO/Fe3O4/GC (the maximum adsorption capacity (Qm) was 390.70 mg g−1) exhibited excellent adsorption capacity and higher removal rate (> 99%) for U(VI) than those of glucose-COOH (GC) and magnetic GC (MGC). The effect of the coexisting ions, such as Na+, K+, Mg2+, Ca2+, and Al3+, on the U(VI) removal efficiency of GO/Fe3O4/GC was examined. The equilibrium sorption and sorption rate for the as-prepared adsorbents well fit the Langmuir model and pseudo second-order kinetic model, respectively. The thermodynamic parameters (ΔH0 = 11.57 kJ mol−1 and ΔG0 < 0) for GO/Fe3O4/GC indicate that the sorption process of U(VI) was exothermic and spontaneous. Thus, this research provides a facile strategy for the preparation of the magnetic composite with low cost, high efficiency and fast separation for the U(VI) removal from aqueous solution.

scholarly journals Optimization of experimental parameters for retention of Pb(II) ions from aqueous solution on clay adsorbent

2020 ◽  
Vol 2 (1) ◽  
pp. 38-47
Author(s):  
Bianca Azanfire ◽  
Dumitru Bulgariu ◽  
Lăcrămioara Nemeş ◽  
Laura Bulgariu
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Environmental Remediation ◽  
High Efficiency ◽  
Low Cost ◽  
Initial Solution ◽  
Clay Material ◽  
Solution Ph ◽  
Experimental Parameters ◽  
Potential Applicability

The removal of Pb(II) ions is an important issue for the treatment of industrial wastewater, due to its serious consequences on environment and human health. In this study a local clay material was tested as adsorbent for the retention of Pb(II) ions from aqueous solution. The proposed method can be considered low-cost, mainly due to the high availability of clay material in this region, and the high removal percent of Pb(II) ions (> 99%) allows us to say that this method has a high efficiency. Therefore, the finding of the optimal values of the most important experimental parameters which affects the efficiency of Pb(II) ions adsorption on clay adsorbent, represent the next important step in highlighting the practical applicability of this process. The most important experimental parameters, including initial solution pH,adsorbent dose, initial Pb(II) ions concentration, contact time and temperature, were analyzed in batch systems. The obtained experimental results indicates that the efficiency of adsorptionprocess is highest at initial solution pH of 7.0, 4.0 g adsorbent/L, 5 min of contact time and high temperature (50 C). Under these conditions, the removal percent of Pb(II) ions is over 99 % over the initial concentration range between 20 and 310 mg Pb(II)/L. The results of this study suggest that this clay material is an excellent adsorbent for Pb(II) ions removal and broadens the potential applicability of these materials in environmental remediation.

Study on a New Glass Polishing Plate

2012 ◽  
Vol 548 ◽  
pp. 199-202 ◽  
Author(s):  
Jin Shen Chen ◽  
Hong Mei Zhi ◽  
Shao Guo Wen
Keyword(s):  
Rare Earth ◽  
Cerium Oxide ◽  
Low Cost ◽  
Water Soluble ◽  
Bonding Agent ◽  
Core Shell ◽  
Abrasive Tool ◽  
Grinding Efficiency ◽  
Shell Composite ◽  
Glass Polishing

This paper reports a polishing disk which can substitute for rare earth. Using alumina - cerium oxide core-shell composite abrasive as abrasive, unsaturated resin as bonding agent, abrasive tool can be prepared by adding a water soluble pore-forming agent, suitable heat absorbing agent and active stuffing and the suitable addition amounts which are 25.6%, 46.8%, 18.5%, 3.8% and 1.2%, respectively .This abrasive tool can conduct the temperature in the grinding zone rapidly. It also has high grinding efficiency smooth polishing surface and without cracks or scratches, which meet furthermore, it has the merits of low cost and extensive use prospect. The polishing effect of rare earth polishing disk, but the low cost make it suitable for wide promotion.

scholarly journals Facile Preparation and Highly Efficient Sorption of Magnetic Composite Graphene Oxide/Fe3O4/GC for Uranium Removal

2021 ◽  
Author(s):  
Aili Yang ◽  
Zhijun Wang ◽  
Yukuan Zhu
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
High Efficiency ◽  
Removal Rate ◽  
Low Cost ◽  
Hydrothermal Carbonization ◽  
Maximum Adsorption Capacity ◽  
Magnetic Composite ◽  
Order Kinetic

Abstract In this work, we reported for the first time a novel magnetic composite graphene oxide/Fe3O4/glucose-COOH (GO/Fe3O4/GC) that was facilely prepared from glucose through the hydrothermal carbonization and further combination with graphene oxide (GO). The chemical and structural properties of the samples were investigated. By the batch uranium adsorption experiments, the magnetic composite GO/Fe3O4/GC exhibits an excellent adsorption performance and fast solid-liquid separation for uranium from aqueous solution. GO/Fe3O4/GC (the maximum adsorption capacity (Qm) was 390.70 mg g-1) exhibited excellent adsorption capacity and higher removal rate (> 99%) for U(VI) than those of glucose-COOH (GC) and magnetic GC (MGC). The effect of the coexisting ions, such as Na+, K+, Mg2+, Ca2+, and Al3+, on the U(VI) removal efficiency of GO/Fe3O4/GC was examined. The equilibrium sorption and sorption rate for the as-prepared adsorbents well fit the Langmuir model and pseudo second-order kinetic model, respectively. The thermodynamic parameters (ΔH0 = 11.57 kJ mol-1 and ΔG0 < 0) for GO/Fe3O4/GC indicate that the sorption process of U(VI) was exothermic and spontaneous. Thus, this research provides a facile strategy for the preparation of the magnetic composite with low cost, high efficiency and fast separation for the U(VI) removal from aqueous solution.

Removal of Cu(II) and Ni(II) ions from an aqueous solution using α-Fe2O3 nanoparticle-coated volcanic rocks

2015 ◽  
Vol 72 (12) ◽  
pp. 2154-2165 ◽  
Author(s):  
Xianfang Zhu ◽  
Tiehong Song ◽  
Zhuo Lv ◽  
Guodong Ji
Keyword(s):  
Aqueous Solution ◽  
High Efficiency ◽  
Adsorption Process ◽  
Low Cost ◽  
Volcanic Rocks ◽  
Fe2o3 Nanoparticles ◽  
Combined Control ◽  
Intra Particle Diffusion ◽  
Fe2o3 Nanoparticle ◽  
Pseudo Second Order

An adsorbent, volcanic rocks coated with α-Fe2O3 nanoparticles, was prepared and utilized for the removal of Cu(II) and Ni(II) ions from an aqueous solution. Characterization of the coated volcanic rocks indicated that the α-Fe2O3 nanoparticles were successfully and homogeneously distributed on the volcanic rocks, including penetration into rock pores. Batch experiments were conducted to investigate adsorption performance. The adsorption behavior of both ions was found to best fit a pseudo second-order model and Langmuir isotherm. The maximum adsorption capacities of Cu(II) and Ni(II) ions were 58.14 mg g−1 and 56.50 mg g−1 at 293 K, respectively, and increased with rising temperature. The loaded α-Fe2O3 nanoparticles onto volcanic rock significantly increased removal of Cu(II) and Ni(II) ions. The adsorption process was combined control of film diffusion and intra-particle diffusion. Adsorption thermodynamics indicated the adsorption process was spontaneous and occurred mainly through chemisorption. The results confirmed that the volcanic rocks coated with α-Fe2O3 nanoparticles acted as a high-efficiency and low-cost absorbent, and effectively removed Cu(II) and Ni(II) from wastewater.

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