scholarly journals A Comprehensive Characterization of Different Fractions of Corn Stover and Their Relationships to Multipollutant Sorption Characteristics

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Dan Peng ◽  
Fan Ouyang ◽  
Min Deng ◽  
Lei Nie ◽  
Sifang Kong
Keyword(s):  
Adsorption Capacity ◽  
Corn Stover ◽  
Organic Pollutants ◽  
Lignin Content ◽  
Chemical Properties ◽  
Cellulose Content ◽  
Adsorption Effect ◽  
Adsorption Processes ◽  
Pseudo Second Order ◽  
Physical And Chemical

Corn stover (CS) is mainly composed of three parts: pith (CSP), rind (CSR), and leaf (CSL). These parts have different lignocellulosic constituents and structural properties. Herein, biosorbents derived from individual corn stover constituents were prepared in an effort to determine the significance of each constituent for multipollutant removal. In this study, SEM, BET, XRD, FTIR, XPS, fibre composition, and contact angle measurements were used to characterize and analyse the physical and chemical properties of the three components of CS and to study their adsorption effects, adsorption isotherms, and kinetics. The lignocellulosic compositions of CSP and CSR were similar, the cellulose content in CSP and CSR was significantly higher than that in CSL, and the hemicellulose content of CSL was much higher than those of CSP and CSR. The minimum lignin content was found in CSP, and the maximum lignin content was found in CSR. The results show that each component had a certain adsorption effect on typical organic pollutants (antibiotics, oils, and dyes). CSP had the strongest oil adsorption capacity, CSR was more suitable for adsorbing antibiotics, and CSL had outstanding adsorption capacity for dye. The pseudo-second-order model and the Langmuir adsorption isotherm model could describe the adsorption processes well, and they consisted of monolayer adsorption accompanied by chemical adsorption reactions. The focus of this study was to provide references for selecting effective adsorbent precursors to remove organic pollutants from wastewater.

scholarly journals Facile Synthesis of Cross-linked Hyperbranched Polyamidoamines Dendrimers for Efficient Hg(Ⅱ) Removal From Water

2021 ◽  
Vol 9 ◽  
Author(s):  
Xue Geng ◽  
Rongjun Qu ◽  
Xiangyu Kong ◽  
Shengnan Geng ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Metal Ion ◽  
Large Scale ◽  
Chemical Properties ◽  
Diglycidyl Ether ◽  
Langmuir Model ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Pseudo Second Order ◽  
Physical And Chemical

Dendrimers as commonly used metal ions adsorption materials have the advantages of good adsorption performance and high reuse rate, but the high cost limits its extensive use. Compared with dendrimers, hyperbranched dendrimers have similar physical and chemical properties and are more economical. Therefore, hyperbranched dendrimers are more suitable for industrial large-scale adsorption. The hyperbranched polyamidoamine (HPAMAM) gels were prepared by cross-linking hyperbranched polyamidoamine (HPAMAM-ECH-x and HPAMAM-EGDE-x) with different amounts of epichlorohydrin (ECH) and ethylene glycol diglycidyl ether (EGDE), respectively. The as-synthesized adsorbents were characterized by FT-IR, SEM and XPS. The prepared adsorbents were used to adsorb Hg(Ⅱ) in aqueous solution, and the effects of solution pH, contact time, temperature and initial concentration of metal ion on the adsorption capacity were investigated. The effect of solution pH indicated that the optimum condition to Hg(Ⅱ) removing was at pH 5.0. The adsorption kinetic curves of the two kinds of materials were in accordance with the pseudo-second-order model. For the HPAMAM-ECH samples, the adsorption thermodynamic curves fitted the Langmuir model, while for the HPAMAM-EGDE samples, both Langmuir and Freundlich equations fitted well. The maximum adsorption capacity of HPAMAM-ECH-3 obtained from Langmuir model toward Hg(Ⅱ) was 3.36 mmol/g at pH 5.0 and 35°C.

The Research on the Physical and Chemical Properties of Eggplant Stalk Fiber for the Complex Utilization of Stalk

2014 ◽  
Vol 881-883 ◽  
pp. 1161-1164
Author(s):  
Li Xia Li ◽  
Hai Tao Chen
Keyword(s):  
Lignin Content ◽  
Chemical Properties ◽  
Test Method ◽  
Chemical Compositions ◽  
Cellulose Content ◽  
Physical And Chemical Properties ◽  
Length Width ◽  
Complex Utilization ◽  
Physical And Chemical ◽  
And Chemical Properties

The physical and chemical properties of stalk fiber extracted by different method was important for the characters of the product. And the research laid the foundation for the complex utilization of eggplant stalk.Morphology of eggplant stalk fiber was determined by Feica microscope, the length, width and length to wide ratio were analyzed by SPSS 17.0. Chemical compositions different analysisof eggplant stalk fiber extracted by mechanical process were analyzed by applying Block test method with Design-expert 6.0.10.The result present that length, width, and length to wide ratio of stalk fiber were 11 mm,1338 um,20,respectively. Cellulose content of eggplant stalk was 34.31 %, hemi-cellulose content was 11.03%, lignin content was10.69 %.Cellulose content of eggplant stalk fiber was 36.2 %, hemi-cellulose content was18.55 %,lignin content was 17.49%.Hemi-cellulose increased by 7.52 %, cellulose increased by1.89 %, lignin increased by 6.8 %.The composition of fiber had significant difference.Beating degree was positively correlated with the beating time, beating time and wet weight were a negative correlation. Strength of stalk fiber was positively with the gramme, and strength was8.3N when gramme was 60 g/m2.

Adsorption of Methylene Blue from Aqueous Solution Using Honeycomb-Cinder

2012 ◽  
Vol 550-553 ◽  
pp. 2259-2262
Author(s):  
Song Bo Cui ◽  
Hua Yong Zhang ◽  
Lu Yi Zhang
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Dye Wastewater ◽  
Batch System ◽  
Adsorption Data ◽  
Adsorption Processes ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Mb Adsorption

The adsorption behavior of methylene blue (MB) dye from aqueous solutions onto honeycomb-cinder (HC) and its acid-activated product was investigated in a batch system. The results showed the adsorption capacity was decreased for raw HC samples with the increase of pH value, while it was increased for activated samples. The adsorption data were fit with Langmuir isotherm model for MB adsorption by all samples. The MB adsorption capacity on samples was increased from 2.62 mg/g to 7.81 mg/g and 7.00 mg/g after acid-activated by HCl and H2SO4, respectively. The adsorption processes of MB followed pseudo-second-order kinetics with a coefficient of correlation≥0.99. This study demonstrated that acid-activated HC has superior adsorbing ability for MB than raw HC and can be used as alternative adsorbents in dye wastewater treatment.

scholarly journals Efficient adsorption of Hg(II) from aqueous solution by N, S co-doped MnFe2O4@C magnetic nanoparticles

2020 ◽  
Vol 81 (6) ◽  
pp. 1273-1282 ◽  
Author(s):  
Hangdao Qin ◽  
Hao Cheng ◽  
Chenggui Long ◽  
Xiaogang Wu ◽  
Yanhong Chen ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Chemical Properties ◽  
Point Of Zero Charge ◽  
Simple Method ◽  
Transmission Electron ◽  
Pseudo Second Order ◽  
Enhanced Adsorption ◽  
Adsorption Desorption ◽  
Physical And Chemical ◽  
Co Doped

Abstract N, S co-doped MnFe2O4@C magnetic nanoparticles were successfully synthesized by a simple method involving the preparation of MnFe2O4 nanoparticles and subsequent pyrolysis treatment. The physical and chemical properties of MnFe2O4, MnFe2O4@C and MnFe2O4@C–NS nanoparticles were characterized by X-ray diffraction (XRD), vibrating sample magnetometry (VSM), transmission electron microscopy (TEM), N2 adsorption–desorption and the pH at the point of zero charge. Their performances in the adsorption of Hg(II) from water were investigated. The adsorption process followed pseudo-second-order kinetics and the experimental data of equilibrium isotherms fitted well with the Langmuir model. MnFe2O4@C–NS showed the highest adsorption capacity of 108.56 mg/g, increasing more than 1.7 times compared to MnFe2O4. The enhanced adsorption performance was attributed to the larger specific surface area as well as the complexation of N and S ligands on the surface. The thermodynamic parameters of ΔH°, ΔS° and ΔG° at 30 °C were −24.39 kJ/mol, −0.046 kJ/mol K and −10.45 kJ/mol, respectively, which indicated that the adsorption of Hg(II) on MnFe2O4@C–NS was exothermic and spontaneous in nature. Moreover, MnFe2O4@C–NS showed superior selectivity towards Hg(II) compared with other metal ions generally present in mercury-containing industrial wastewater.

The Removal and Inhibitory Effect of CNTs on Model Viruses

2013 ◽  
Vol 743-744 ◽  
pp. 402-408 ◽  
Author(s):  
Shi Yuan Liu ◽  
Xiang Zheng ◽  
Ye Yang ◽  
Jia Liu ◽  
Jie Li
Keyword(s):  
Freundlich Isotherm ◽  
Inhibitory Effect ◽  
Multilayer Adsorption ◽  
Adsorption Effect ◽  
Ms2 Bacteriophage ◽  
Adsorption Processes ◽  
Pseudo Second Order ◽  
Static And Dynamic Tests ◽  
The Impact ◽  
Removal System

Nanomaterial is becoming an important adsorption or disinfection material for removing virus from drinking water. In this study, static and dynamic tests were used to examine adsorption and inhibition characteristics of carbon nanotubes (CNTs) on two model viruses -- f2 and MS2 bacteriophage. Controlling variate method was used to systematically investigate the adsorption kinetics and adsorption isotherms of CNTs on two model viruses; as well as to find the impact of different CNTs dosages on adsorption effect; and then to study the inhibitory effect of CNTs.The results showed that: (1) The adsorption process of f2 and MS2 bacteriophage on CNTs corresponded well with the pseudo-second-order kinetics equation. Time to reach a saturation equilibrium adsorption is about 30min. (2) Both the Langmuir and Freundlich isotherm adequately described two adsorption processes which indicated that the removal mechanism of virus was a mix of monolayer and multilayer adsorption. (3)The dosage of a single removal system should not be too high in practical application. (4) The inhibition of CNTs on model viruses exhibited.

scholarly journals Effect of chemical aging of Alternanthera philoxeroides-derived biochar on the adsorption of Pb(II)

2019 ◽  
Vol 80 (2) ◽  
pp. 329-338
Author(s):  
Xuan Wang ◽  
Yande Jing ◽  
Yongqiang Cao ◽  
Shuo Xu ◽  
Lidong Chen
Keyword(s):  
Adsorption Capacity ◽  
Structural Changes ◽  
Aging Treatment ◽  
Alternanthera Philoxeroides ◽  
Order Kinetic ◽  
Adsorption Effect ◽  
Chemical Aging ◽  
Adsorption Capacities ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Abstract In this study, biochar was prepared from Alternanthera philoxeroides (AP) under O2-limited condition at 350 °C (LB) and 650 °C (HB) and treated with aging by HNO3/H2SO4 oxidation. Structural changes of the biochar after aging treatment and the treatment's effect on Pb(II) absorption were explored. The results showed that oxygen-containing functional groups, aromatic structure and surface area of the biochar increased after the aging treatment. However, the integrity of the tubular structure was broken into fragments. The adsorption process of Pb(II) was in accordance with the pseudo-second-order kinetic model and fitted by the Langmuir model. With the increase of pH, the adsorption capacities of Pb(II) increased gradually, and the adsorption effect was best at pH 5. The aged HB presented a decrease of the carboxyl group, which caused less adsorption capacity of Pb(II) than that of aged LB. The maximum adsorption capacities of Pb(II) on fresh biochar at 350 °C and 650 °C were 279.85 and 286.07 mg·g−1 and on aged biochar were 242.57 and 159.82 mg·g−1, respectively. The adsorption capacity of HB for Pb(II) was higher than that of LB, and the adsorption capacity of aged biochar for Pb(II) decreased obviously, which might be attributable to changes in physicochemical properties of biochar after the aging treatment.

Physical and chemical properties of bio-oils from microwave pyrolysis of corn stover

2007 ◽  
Vol 137-140 (1-12) ◽  
pp. 957-970 ◽  
Author(s):  
Fei Yu ◽  
Shaobo Deng ◽  
Paul Chen ◽  
Yuhuan Liu ◽  
Yiqin Wan ◽  
...  
Keyword(s):  
Corn Stover ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Microwave Pyrolysis ◽  
Physical And Chemical ◽  
And Chemical Properties

Removal of bromate from water using modified activated carbon

2012 ◽  
Vol 12 (3) ◽  
pp. 398-405 ◽  
Author(s):  
Tongmian Liu ◽  
Fuyi Cui ◽  
Dongmei Liu ◽  
Zhiwei Zhao ◽  
Zhiquan Liu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Electrostatic Interactions ◽  
Adsorption Process ◽  
Chemical Properties ◽  
Modified Activated Carbon ◽  
Surface Basicity ◽  
Adsorption Data ◽  
Physical And Chemical ◽  
And Chemical Properties

Coal-based activated carbon (AC) was treated chemically with nitric acid, sodium hydroxide and ammonia, and its ability to adsorb bromate was investigated. Several techniques were used to characterize the physicochemical properties of these materials, including surface area, pHpzc, and Boehm titration. Results indicated that surface physical and chemical properties can influence the adsorption uptake of bromate on ACs simultaneously. Surface basicity and pHpzc were both found to influence the electrostatic interactions between the bromate ions and the surface of the carbon. A correlation was found between basic groups and the adsorption capacity for bromate. The adsorption capacity of the carbon was found to be linearly proportional to the amount of basic groups on the surface. The bromate adsorption data collected from all the samples were found to fit the Toth isotherm model, indicating that the bromate adsorption process could occur on heterogeneous surfaces.

Removal of Mn(II) from Aqueous Solution Using Saponified Garlic Peel

2014 ◽  
Vol 694 ◽  
pp. 382-386 ◽  
Author(s):  
Bo Liang ◽  
Wan He Zhao ◽  
Kai Huang ◽  
Hong Min Zhu
Keyword(s):  
Metal Ion ◽  
Chemical Properties ◽  
Correlation Coefficients ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Physical And Chemical ◽  
Garlic Peel

The removal of Mn (II) ion by saponified garlic peel (S-GP) was investigated using batch adsorption. SEM and FT-IR were employed to investigate the physical and chemical properties of S-GP. The adsorption was evaluated as a function of initial metal ion concentration, contact time and temperature. The maximum adsorption capacity for Mn (II) was 0.51 mol/kg, and the adsorption process followed the Langmuir model. Pseudo-second-order models fitted the experimental data well and kinetic parameters, rate constants, equilibrium sorption capacity and related correlation coefficients at various temperatures were calculated and discussed. A possible adsorption mechanism based on a cation exchange was proposed for the adsorption of Mn (II).

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