Synthesis of Double Crosslinked Amphoteric Cassava Starch Resin and Performance of Absorbing Cu (II)

2013 ◽  
Vol 726-731 ◽  
pp. 588-591
Author(s):  
He Ping Li ◽  
Yang Hu ◽  
Hu Qiang Lv ◽  
Yong Zhe Yang ◽  
Yao Zhang
Keyword(s):  
Acrylic Acid ◽  
Infrared Spectrum ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Cassava Starch ◽  
Sodium Polyphosphate ◽  
Adsorption Time ◽  
Resin Adsorption ◽  
And Performance ◽  
Main Material

Sodium polyphosphate-crosslinked starch was synthesized by using cassava starch and sodium polyphosphate as main material and crosslinked agent individually. On above basis, double crosslinked amphoteric cassava starch resin was synthesized by N,N'-methylene bisacrylamide as inner-crosslinked agent, dimethyl diallyl ammonium chloride (DMDAAC) and acrylic acid as amphoteric grafted monomer. The product was characterized by infrared spectrum (FTIR). The results indicate that the cassava starch was modified successfully, and the final product was double crosslinked amphoteric cassava starch resin. Adsorption behavior of Cu2+ was studied in the condition of different adsorption time, and found that the removal rate and the adsorption capacity of Cu2+ reached up to 98.3% and 196.6 mg/g respectively.

Absorption of Hg (II) Form Aqueous Solution onto Double Crosslinked Amphoteric Cassava Starch Resin

2014 ◽  
Vol 886 ◽  
pp. 253-256
Author(s):  
He Ping Li ◽  
Yun Yan Huang ◽  
Jin Wei Yuan ◽  
Guan Wei Yang ◽  
Hu Qiang Lv ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Acrylic Acid ◽  
Removal Rate ◽  
Cassava Starch ◽  
Sodium Polyphosphate ◽  
Adsorption Time ◽  
Scanning Electron ◽  
Main Material

Sodium polyphosphate-crosslinked starch was synthesized by using cassava starch and sodium polyphosphate as main material and crosslinked agent individually. On above basis, double crosslinked amphoteric cassava starch resin was synthesized through three steps of reactions, which included the inner-crosslinked reaction of starch with N,N'-methylene bisacrylamide, the grafted reaction of the obtained copolymer with dimethyl diallyl ammonium chloride (DMDAAC) and the grafted reaction of the obtained copolymer with acrylic acid. The product was characterized by scanning electron microscopy (SEM). The results indicate that the cassava starch was modified successfully. Adsorption behavior of Hg2+ was studied in the condition of different adsorption time, and found that the removal rate and the adsorption capacity of Hg2+ reached up to 95.98% and 191.97 mg/g respectively.

scholarly journals Preparation of grafting copolymer of acrylic acid onto loess surface and its adsorption behavior

2020 ◽  
Vol 82 (4) ◽  
pp. 673-682
Author(s):  
Fengqin Tang ◽  
Di Gao ◽  
Li Wang ◽  
Yufeng He ◽  
Pengfei Song ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Vinyl Pyrrolidone ◽  
Mineral Particle ◽  
Gravimetric Analysis ◽  
Order Kinetic ◽  
Experimental Conditions ◽  
Order Kinetic Model ◽  
Grafting Copolymer

Abstract Loess is a typical natural mineral particle distributed widely around the world, and it is inexpensive, readily accessible, and harmless to the environment. In this study, loess was modified by surface grafting copolymerization of functional monomers, such as acrylic acid, N-vinyl pyrrolidone, and N,N-methylenebisacrylamide as a cross-linking agent, which afforded a novel loess-based grafting copolymer (LC-PAVP). After being characterized by scanning electron microscopy, thermal gravimetric analysis and Fourier-transform infrared spectroscopy, its adsorption capacity and mechanism of removing lead ions (Pb2+) were investigated. With the study of the optimal experimental conditions, it was demonstrated that the removal rate of Pb2+ by LC-PAVP can reach up to 99.49% in 60 min at room temperature. It was also found that the kinetic characteristics of the adsorption capacity due to the pseudo-second-order kinetic model and the thermodynamics conformed well with the Freundlich model. In summary, as a lost-cost and eco-friendly loess-based adsorbent, LC-PAVP is a good potential material for wastewater treatment.

Sorption of Ag+, Cu2+ on Thiol-Functionalized Poly (Acrylic Acid)/SiO2 Composite Nanofiber Membranes

2011 ◽  
Vol 356-360 ◽  
pp. 488-492
Author(s):  
Ran Xu ◽  
Min Jia ◽  
Feng Ting Li
Keyword(s):  
Acrylic Acid ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Sol Gel ◽  
Electrospinning Method ◽  
Composite Nanofiber ◽  
Pseudo Second Order ◽  
Nanofiber Membranes ◽  
Kinetics Of ◽  
Poly Acrylic Acid

Thiol-functionalized poly (acrylic acid)/SiO2 (PAA/SiO2) composite nanofiber membranes have been fabricated by a sol-gel electrospinning method and their adsorption capacity for Ag+, Cu2+ was investigated. Results showed the PAA/SiO2 fibers had a diameter between 300 nm-700 nm. FTIR results demonstrated that the mercapto groups have been introduced into the silica skeleton. The adsorption of Ag+, Cu2+ on the membranes fit the Redlich-Peterson isotherm model best. The equilibrium adsorption capacity of Ag+ (575.64 mg/g) on PAA/SiO2 nanofiber membranes is higher than Cu2+ (331.52 mg/g). The desorption rate reached 98% in 30 min. The removal rate of Ag+, Cu2+ still maintained above 75% after six regeneration cycles. Adsorption kinetics of Ag+, Cu2+ followed a pseudo-second-order model.

Study on Tdsorption of Heavy Metalion in Metallurgical Wastewater by Montmorillonite

2012 ◽  
Vol 461 ◽  
pp. 601-605
Author(s):  
Xiu Yan Zhou ◽  
Xiang Xin Xue ◽  
Yu Hua Zhao ◽  
Ou Liu
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Adsorption Time ◽  
Adsorbent Dosage ◽  
Temperature Conditions ◽  
Multiple Heavy Metals

In this study, the sorption of single heavy metal (Cu2+, Pb2+ and Zn2+) and multiple heavy metals in simulated metallurgical wastewater by montmorillonite was investigated. The effect of adsorption time and temperature conditions, etc. on the adsorption was also studied. The results showed that in the same concentration of adsorbent dosage, removal rate of single heavy metal is the highest (99.9%, 88.1% and 98.3%) when the concentration of Cu2+, Pb2+ and Zn2+ is 50 mg/L, 20mg/L and 100mg/L, respectively. The adsorption of multiple heavy metals in simulated metallurgical wastewater is the highest in 4 hours at 20°C. The adsorption capacity is in order of Pb2+≈Zn2+>Cu2+>Cd2+ and removal rate is 90.8%, 87.3%, 70.0% and 51.6%, respectively.

Adsorption of Cu2+ from Aqueous Solution by Walnut Shell

2013 ◽  
Vol 864-867 ◽  
pp. 1327-1332 ◽  
Author(s):  
Xiu Guo Lu ◽  
Pei Pei Yan ◽  
Xiao Fang Dang
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Equilibrium Concentration ◽  
Walnut Shell ◽  
Adsorption Time ◽  
Adsorbent Dosage ◽  
Initial Ph

Walnut shell was used as adsorbent to remove Cu2+ metal ions from the simulated aqueous solution. The influence of factors, namely: particle size, initial pH, oscillation intensity, adsorbent dosage and adsorption time were investigated through single factor experiments.The results show that, the adsorption capacity reached the peak for Cu2+ in 25°C when the initial pH was 5, particle size was 1.25~1.6mm, adsorbent dosage was2.5g, oscillation speed reached 200r/min, and the adsorption time was 360min, all above leads the removal rate of Cu2+reached 75.7%, and the adsorption capacity of Cu2+ 0.702 mg/g. The pseudo-second-order model was fitted to describe the adsorption of Cu2+ , it was shown that adsorption rate for the metal ions in proportion to the square of the concentration.The equilibrium concentration of adsorption fitted well with Langmuir isotherm equation, the process of adsorption was single molecular layer adsorption.

Efficiency of Adsorption of Wastewater Containing Uranium by Fly Ash

2013 ◽  
Vol 639-640 ◽  
pp. 1295-1299 ◽  
Author(s):  
Shi You Li ◽  
Shui Bo Xie ◽  
Cong Zhao ◽  
Ya Ping Zhang ◽  
Jin Xiang Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Uranium Concentration ◽  
Ph Value ◽  
Removal Rate ◽  
Adsorption Behavior ◽  
Maximum Adsorption Capacity ◽  
Adsorption Time ◽  
Effects Of Ph ◽  
Adsorption Quantity

The effects of pH, different initial concentrations of uranium and adsorption time were investigated to study the properties of the sorption of uranium by fly ash. The results show that pH value is the major factor of dominating adsorption rate. The highest adsorption capacity was obtained at pH 5 and the adsorption time was 60 minutes. The increasing of initial uranium concentration resulted in the decreasing of U removal rate and the increasing of adsorption quantity, and the maximum adsorption capacity was 8.38mg/g. The adsorption behavior accorded with both the Freundlich and Langmuir isotherms.

Analysis of organic removal rates in the aerated submerged fixed film process

1998 ◽  
Vol 38 (8-9) ◽  
pp. 213-221 ◽  
Author(s):  
Mohamed F. Hamoda ◽  
Ibrahim A. Al-Ghusain
Keyword(s):  
Pilot Plant ◽  
Removal Rate ◽  
Domestic Wastewater ◽  
Removal Rates ◽  
Hydraulic Loading ◽  
Organic Removal ◽  
Wide Range ◽  
Fixed Film ◽  
Cod Removal Rate ◽  
And Performance

Performance data from a pilot-plant employing the four-stage aerated submerged fixed film (ASFF) process treating domestic wastewater were analyzed to examine the organic removal rates. The process has shown high BOD removal efficiencies (> 90%) over a wide range of hydraulic loading rates (0.04 to 0.68 m3/m2·d). It could also cope with high hydraulic and organic loadings with minimal loss in efficiency due to the large amount of immobilized biomass attained. The organic (BOD and COD) removal rate was influenced by the hydraulic loadings applied, but organic removal rates of up to 104 kg BOD/ m2·d were obtained at a hydraulic loading rate of 0.68 m3/m2·d. A Semi-empirical model for the bio-oxidation of organics in the ASFF process has been formulated and rate constants were calculated based on statistical analysis of pilot-plant data. The relationships obtained are very useful for analyzing the design and performance of the ASFF process and a variety of attached growth processes.

scholarly journals Stormwater Runoff Treatment Using Pervious Concrete Modified with Various Nanomaterials: A Comprehensive Review

2021 ◽  
Vol 13 (15) ◽  
pp. 8552
Author(s):  
Vahid Alimohammadi ◽  
Mehdi Maghfouri ◽  
Delaram Nourmohammadi ◽  
Pejman Azarsa ◽  
Rishi Gupta ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Compressive Strength ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Stormwater Runoff ◽  
Infiltration Rate ◽  
Stormwater Treatment ◽  
Adsorption Mechanisms ◽  
Wide Range ◽  
Adsorption Processes

Clean water is a vital need for all living creatures during their lifespan. However, contaminated stormwater is a major issue around the globe. A wide range of contaminants, including heavy metals, organic and inorganic impurities, has been discovered in stormwater. Some commonly utilized methods, such as biological, physical and chemical procedures, have been considered to overcome these issues. However, these current approaches result in moderate to low contaminant removal efficiencies for certain classes of contaminants. Of late, filtration and adsorption processes have become more featured in permeable concretes (PCs) for the treatment of stormwater. As nanoparticles have vast potential and unique characterizations, such as a higher surface area to cure polluted stormwater, employing them to improve permeable concretes’ capabilities in stormwater treatment systems is an effective way to increase filtration and adsorption mechanisms. The present study reviews the removal rate of different stormwater contaminants such as heavy metals, organic and other pollutants using nanoparticle-improved PC. The application of different kinds of nanomaterials in PC as porous media to investigate their influences on the properties of PC, including the permeability rate, compressive strength, adsorption capacity and mix design of such concrete, was also studied. The findings of this review show that different types of nanomaterials improve the removal efficiency, compressive strength and adsorption capacity and decrease the infiltration rate of PC during the stormwater treatment process. With regard to the lack of comprehensive investigation concerning the use of nanomaterials in PC to treat polluted stormwater runoff, this study reviews 242 published articles on the removal rate of different stormwater contaminants by using PC improved with nanoparticles.

scholarly journals Hydrothermal Synthesis of Sodalite-Type N-A-S-H from Fly Ash to Remove Ammonium and Phosphorus from Water

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2741
Author(s):  
Pengcheng Lv ◽  
Ruihong Meng ◽  
Zhongyang Mao ◽  
Min Deng
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Kinetic Studies ◽  
Solute Concentration ◽  
Raw Material ◽  
Sodium Aluminosilicate ◽  
Equilibrium Data ◽  
One Step ◽  
Ft Ir

In this study, the hydrated sodium aluminosilicate material was synthesized by one-step hydrothermal alkaline desilication using fly ash (FA) as raw material. The synthesized materials were characterized by XRD, XRF, FT-IR and SEM. The characterization results showed that the alkali-soluble desilication successfully had synthesized the sodium aluminosilicate crystalline (N-A-S-H) phase of sodalite-type (SOD), and the modified material had good ionic affinity and adsorption capacity. In order to figure out the suitability of SOD as an adsorbent for the removal of ammonium and phosphorus from wastewater, the effects of material dosing, contact time, ambient pH and initial solute concentration on the simultaneous removal of ammonium and phosphorus are investigated by intermittent adsorption tests. Under the optimal adsorption conditions, the removal rate of ammonium was 73.3%, the removal rate of phosphate was 85.8% and the unit adsorption capacity reached 9.15 mg/L and 2.14 mg/L, respectively. Adsorption kinetic studies showed that the adsorption of ammonium and phosphorus by SOD was consistent with a quasi-secondary kinetic model. The adsorption isotherm analysis showed that the equilibrium data were in good agreement with the Langmuir and Freundlich model. According to thermodynamic calculations, the adsorption of ammonium and phosphorus was found to be a heat-absorbing and spontaneous process. Therefore, the preparation of SOD by modified FA has good adsorption properties as adsorbent and has excellent potential for application in the removal of contaminants from wastewater.

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