Adsorption of Cr(VI) from aqueous solution by chemically modified natural cellulose

Zhu, Hongxiang; Kong, Qiaoping; Cao, Xuejuan; He, Hui; Wang, Jin; He, Yubin

doi:10.1080/19443994.2015.1108237

Cited by 17 publications

(4 citation statements)

References 29 publications

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“…The higher surface area usually equates to greater adsorption capability. However, the adsorption capacity of activated carbon is also influenced by pore size and volume [34]. The pore size properties determine the dimension of the contaminant elements that the carbon may absorb.…”

Section: Outcomes Of Hybrid Compositesmentioning

confidence: 99%

Multiresponse Optimization of Mechanical and Physical Adsorption Properties of Activated Natural Fibers Hybrid Composites

Velmurugan

Shankar

Natrayan

et al. 2022

Adsorption Science & Technology

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In the current scenario, natural fiber-based biodegradable composites have increased because natural composite fibers are very cheap, biodegradable, lightweight, fireproof, and nontoxic. The present research work was carried out to optimize the mechanical properties of hybrid composites reinforced by Calotropis gigantea and hemp. To achieve these objectives, the following process parameters were determined, and RSM carried out optimization with the Box-Behnken experimental setup at three different levels: compression molding temperature (°C), pressure (bar), and time (min). The fibers were pretreated for 4 hours with a 5% NaOH solution to prevent moisture absorption. Regression equations were constructed to evaluate the mechanical properties, and the best process parameters were established. The results reveal that a pressure of 35 bar, a time duration of 7 minutes, and a temperature of 176°C are the best conditions for compression molding. The second aim was to compare CGF and hemp fiber-derived activated carbon adsorbents by determining physical adsorption properties, chemical compositions, and scanning electron microscope. Natural fibers were shown to be ideal candidates for manufacturing mesoporous activated carbon adsorbents with high surface area (1389–1433 m2/g), high mesopore percentage (63–68%), and high carbon content (80–87%). Even though hemp activated carbon had a greater mesoporous structure (69%) than CGF-derived activated carbons, the CGF-derived activated carbons had larger surface areas and higher C content.

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Section: Outcomes Of Hybrid Compositesmentioning

confidence: 99%

Multiresponse Optimization of Mechanical and Physical Adsorption Properties of Activated Natural Fibers Hybrid Composites

Velmurugan

Shankar

Natrayan

et al. 2022

Adsorption Science & Technology

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show abstract

“…(2015)11Chitosan/carboxyl methyl cellulose/silica hybrid membrane1.360 min.0.3 g dm −3 120 mg dm −3 333 K16.08 mg g -1 He et al. (2015)12Chemically modified natural cellulose1120 min.--400 mg dm −3 343 K32.4 mg g -1 Zhu et al. (2015)13Treated waste news paper360 min.3 g dm −3 20 mg dm −3 318 K59.88 mg g -1 Dehghani et al.…”

Section: Resultsmentioning

confidence: 99%

Ultrasound assisted batch operation for the adsorption of hexavalent chromium onto engineered nanobiocomposite

Sarkar

2019

Heliyon

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The study demonstrates the comparative retention characteristics of chromium from aqueous environment on iron(III) cellulose nanocomposite bead under conventional (C-ads) and ultrasound assisted (U-ads) batch adsorption operation. Optimization of process parameters was achieved varying pH, contact/sonication time, initial Cr(VI) concentration, adsorbent dose at fixed solution temperature. Equilibrium was achieved within 5 h and 30 min of contact time in C-ads and U-ads respectively. Langmuir isotherm is found suitable in C-ads while Temkin in U-ads. Both the operation is aided by change in negative free energy, positive enthalpy and entropy. Ultrasound assisted adsorption is much favorable in terms of efficiency, feasibility, spontaneity and randomness. Both the operations follow more the second order than the first order kinetic model. The pore diffusion prevails more in case of U-ads while the surface adsorption in C-ads.

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“…Inorganic nanoparticles and polymeric matrices are mainly combined to provide the qualities of polymeric composites. Due to their high thermal properties, environmental resilience (durability), electrical, toxicological, and mechanical behavior, conductive polymers can be used as a nanocomposite matrix [13,14]. Specific polymers like epoxy matrix are widely recognized as highly fragile.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Numerous Influencing Parameters of Nano-SiO2/Banana Fiber-Reinforced Hybrid Composites using Taguchi and ANN Approach

Natrayan

Surakasi²,

Patil

et al. 2023

Journal of Nanomaterials

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High specific strength, strength-to-weight ratio, cheap cost, and other advantages, nanofillers are now the subject of most research on natural fibers. The current research’s main goal is to combine the Taguchi and artificial neural networks (ANN) approaches to maximize the mechanical characteristics of nanocomposites. The parameters: (i) nano-SiO2 wt%, (ii) banana fiber wt%, (iii) compression pressure in MPa, and (iv) compression molding temperature in °C were selected to achieve the objectives above. An L16 orthogonal array was used to optimize the process parameters based on the Taguchi technique. According to the intended experiment, mechanical characteristics, such as tension, bending, and impact strength, were assessed. The ANN was used to forecast outcomes that were optimized. The fiber mat thickness of banana fiber and the weight ratio of nano-SiO2 showed a considerable improvement in the mechanical characteristics of hybrid composites. According to the Taguchi technique, the most significant mechanical characteristics were 47.36 MPa tensile, 64.48 MPa flexural, and 35.33 kJ of impact under circumstances of 5% SiO2, 19 MPa pressure, and 110 °C. With 95% accuracy, ANN-predicted mechanical strength. The ANN forecast was more accurate than the regression model and experimental data. The above nanobased hybrid composites are mainly employed to satisfy the needs of the contemporary vehicle sector.

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Adsorption of Cr(VI) from aqueous solution by chemically modified natural cellulose

Cited by 17 publications

References 29 publications

Multiresponse Optimization of Mechanical and Physical Adsorption Properties of Activated Natural Fibers Hybrid Composites

Multiresponse Optimization of Mechanical and Physical Adsorption Properties of Activated Natural Fibers Hybrid Composites

Ultrasound assisted batch operation for the adsorption of hexavalent chromium onto engineered nanobiocomposite

Optimizing Numerous Influencing Parameters of Nano-SiO2/Banana Fiber-Reinforced Hybrid Composites using Taguchi and ANN Approach

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