Simultaneous oxidation and esterification of cellulose for use in treatment of water containing Cu(II) ions

Gupta, Arijit Dutta; Pandey, Sweta; Jaiswal, Vivek; Bhadauria, Vivek; Singh, Harinder

doi:10.1016/j.carbpol.2019.06.003

Cited by 35 publications

(8 citation statements)

References 60 publications

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“…In addition, the band in the 3300-3400 cm -1 region corresponds to bending vibrations of the O-H groups, and the 2900 cm −1 band corresponds to the stretching vibrations of the C-H groups. The peak at 1610 cm −1 is generated by the stretching vibrations of O-H bonds, derived from absorbed water or moisture in the sample, was reduced, which can be attributed to the loss of water due to drying the sample [24]. Absorption bands in the 1500-890 cm −1 region show a reduction in intensity, indicating lower crystallinity and an increase in the amorphous form of cellulose as a result of alkaline treatment [25].…”

Section: Chemical Pretreatment Of Hemp Biomassmentioning

confidence: 99%

Chemical and Enzymatic Treatment of Hemp Biomass for Bioethanol Production

2019

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In this study chemical and enzymatic treatment of hemp biomass were optimized to obtain maximum ethanol production. In the first stage, physical and chemical pretreatment of hemp biomass was carried out. It was found that the Tygra variety is susceptible to alkaline treatment at an optimum concentration of 2% NaOH. Next, the effect of NaOH on the value of reducing sugars and the chemical composition of the solid fraction before and after the treatment was determined. Hemp biomass before and after the chemical treatment was analysed by FTIR spectra and SEM. The effect of enzymatic hydrolysis, i.e., substrate content, temperature, time, pH and dose of enzyme by means of Response Surface Methodology on glucose content was determined. The highest glucose value was observed at 50 °C, in time process between 48 and 72 h, and the dose of enzyme was not less than 20 FPU·g−1. After the optimization of enzymatic hydrolysis two processes of ethanol fermentation from hemp biomass, SHF and SSF, were carried out. In the SHF process a 40% higher concentration of ethanol was obtained (10.51 g/L). In conclusion, hemp biomass was found to be an interesting and promising source to be used for bioethanol production.

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Section: Chemical Pretreatment Of Hemp Biomassmentioning

confidence: 99%

Chemical and Enzymatic Treatment of Hemp Biomass for Bioethanol Production

2019

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“…Presence of the concentration gradient between those of the adsorbed and the unadsorbed As(III) ions and the availability of vacant sites provided the necessary driving force for increase in adsorption capacity as a function of time. 21 Greater number of As(III) ions were adsorbed at the onset of adsorption due to greater number of available active sites. It was also observed that the SB adsorbent exhibited the lesser adsorption capacity than the acid modified slag with the same saturation time.…”

Section: 1 Effect Of Contact Timementioning

confidence: 99%

“…The linearized model for Langmuir isotherm is represented in Eq. ( 21): (21) where q m is the maximum adsorption capacity (mg/g), k L is the Langmuir constant (L/g). Separation factor (R L ) is used to determine the feasibility of the process and is given by Eq.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Application of Chemically Modified Industrial Slag to As(III) Adsorption from Wastewater: Kinetics and Mass Transfer Analysis

Gupta

Jaiswal

Bhadauria³

et al. 2021

ACSi

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In the present study, brick kiln slag (BKS) has been utilized for low concentration As(III) adsorption in batch mode. BKS was modified with H2SO4 (SA) and NaOH (SB) for enhancing As(III) uptake capacity. Maximum adsorption capacity (13.7 mg/g) was observed for SA at 298 K, pH = 7.0, adsorbent dose = 0.3 g and time = 70 min which was 1.4 times higher than that of SB. Adsorption data modelled into Freundlich isotherm and pseudo-second-order kinetics. Mass transfer coefficients decreased with increase in As(III) concentration. Film diffusion significantly dominated the adsorption of As(III) ions irrespective of the initial concentration. Dimensionless Sherwood number (Sh) interrelated As(III) concentration (Co) as: Sh = 2.97(Co)–0.376, Sh = 4.12(Co)–0.215, Sh = 4.83(Co)–0.588 for H2SO4 modified, NaOH modified and native slag respectively. Low temperature (298 K) favoured As(III) adsorption (based on ΔG° value). Therefore, the modified slag can be used as an effective adsorbent for As(III) remediation from groundwater.

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“…It is noticed that in the spectrum of raw pulp there is a weak absorption peak at 1640 cm −1 , while this peak is intensified and it appears at 1645 cm −1 in the other three spectra. Associating carbonyl groups existing in a small amount of hemicellulose or adsorbed water might be responsible for the peak at 1640 cm −1 [17]. After alkali treatment and addition of pivaloyl chloride oxidation process in cellulose converts hydroxyl groups into carbonyl [18].…”

Section: Ftir Analysismentioning

confidence: 99%

“…This peak corresponds to C=O vibrations from the ester functions generated by esterification with pivaloyl chloride [21]. What contributes to the uncommon performance might be that prior alkali treatment renders hydroxyl to adsorb hydrated sodium hydroxide, which reduces the amount of free hydroxyl groups in cellulose and, thus, weakens the reactivity with pivaloyl chloride [17,18]. It can also not be neglected that reagent with tertiary butyl, like pivaloyl chloride, has the nature of limited degree of substitution on cellulose.…”

Section: Ftir Analysismentioning

confidence: 99%

Interface Reinforcement of Pulp Fiber Based ABS Composite with Hydrogen Bonding Initiated Interlinked Structure via Alkaline Oxidation and tert-Butyl Grafting on Cellulose

Zhu

2019

Polymers

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Interface optimization in preparing natural fiber based biocomposite becomes a key factor that determines overall properties, especially mechanical performance. The solution for upgrading interfacial adhesion stemmed from polar fiber and nonpolar polymer remains unclear. Here, a kind of pulp fiber/acrylonitrile-butadiene-styrene (ABS) composite with content ratio of 1:1 was fabricated by functionalizing the cellulose fiber to coordinate interaction between fiber and ABS. With addition of 5 wt % polyacrylamide (PAM) there existed an interlinked three-element structure in composite. Three types of treatment to cellulose fiber, including alkali immersion, pivaloyl chloride grafting for 10 h and 20 h were conducted. Pulp fiber that was treated with alkali for one hour, followed by pivaloyl chloride reaction for ten hours, proved to be effective for interfacial adhesion. X-ray Photoelectron Spectroscopy (XPS) analysis reveals 21.9% of carbonyl and 12.1% of ester function in this fiber, which corresponds to oxidation and grafting. For its composite SEM picture displays that most of cellulose fiber are rooted in ABS and evident traces of tearing or fracture can be observed after tension test. DMA test indicates that this modified pulp fiber/ABS composite exhibits great compatibility, because of combined loss modulus peak ranging from 80 °C to 100 °C. Moreover, the well miscible composite has a tensile strength of 58.1 MPa and elastic modulus of 2515 MPa, increasing by nearly 50% and 60% from those of pure ABS, respectively.

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Simultaneous oxidation and esterification of cellulose for use in treatment of water containing Cu(II) ions

Cited by 35 publications

References 60 publications

Chemical and Enzymatic Treatment of Hemp Biomass for Bioethanol Production

Chemical and Enzymatic Treatment of Hemp Biomass for Bioethanol Production

Application of Chemically Modified Industrial Slag to As(III) Adsorption from Wastewater: Kinetics and Mass Transfer Analysis

Interface Reinforcement of Pulp Fiber Based ABS Composite with Hydrogen Bonding Initiated Interlinked Structure via Alkaline Oxidation and tert-Butyl Grafting on Cellulose

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