JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2021
·Vol. 102
·期 1
·425-433
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IF 3.639
Yingying Han,Jinhua Du,Yan Wang
BACKGROUND Apple wine is a popular alcoholic beverage for its nutrition and fresh taste. However, the methanol existing in apple wine restricts its quality. Unfortunately, there are no methods to reduce the methanol content in fruit wine. To this end, bentonite (B), calcium chloride (CC) and their combination (B&CC) were added into apple juice in this study. The treated juice (0) and supernatant obtained by standing the juice at 25 °C for 24 h were fermented at 25 °C and 10 °C, respectively. RESULTS Bentonite was an excellent methanol interrupter, a pectin retainer and a wine quality defender both at 25 and 10 °C. The lowest methanol content of 1.41 mg L −1 and higher pectin content of 84.74 mg L −1 were reached in the finished wine by B0 at 10 °C. Calcium chloride decreased pectin content, elevated methanol content and changed the profile of individual organic acids. In fact, the wine by B&CC0 at 25 °C showed dramatic changes in individual organic acids. The content of l -malic acid and succinic acid was only 2.22% and 6.29% of the control, respectively, while the lactic acid content was 17.72 times that of the control. CONCLUSIONS It is suggested that B0 and fermented at 10 °C was the most effective way to decrease methanol content, retain pectin content and defend wine quality. © 2021 Society of Chemical Industry.
研究领域:
食品科学
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化学
·
饮料技术
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 4
·6360-6374
·
IF 4.223
Wu Jiawei,Xie Haijian,Zhang Chunhua,Bouazza Abdelmalek,Sun Zhilin,Qiu Zhanhong
The leakage of chemical compounds in landfill leachate led to serious environment pollution, especially, the compounds termed endocrine disruptors such as bisphenol A (BPA). It is very important to study the adsorption behavior of endocrine disruptors in modified soil for predicting and evaluating the potential harm of endocrine disruptors to the soil. Bentonite-amended Chinese loess mixtures, with various proportions of bentonite, were used for the removal of BPA from an aqueous solution. A batch test was used to investigate the adsorption properties of bisphenol A on bentonite and Chinese loess mixtures. The influences of bentonite proportion, temperature, reaction time, pH, and soil-water ratios on the adsorption process were considered. The Fourier transform infrared spectra (FTIR) was used to clarify the change of functional groups before and after the adsorption of BPA on soil. The adsorption mechanism of BPA on soil was discussed preliminary. The results show that the addition of bentonite to the loess can improve the adsorption rate of BPA. The adsorption of BPA was mainly a spontaneous, exothermic, entropy decreasing physical adsorption process. The interaction between bentonite content and reaction concentration had a beneficial effect on BPA adsorption. The linear relationship between bentonite content and adsorption capacity was obtained. The results indicate that bentonite amended loess can provide a good liner for BPA.
研究领域:
环境科学
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土壤学
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DOI
PubMed
高影响因子
CLAYS AND CLAY MINERALS
·
2023
·Vol. 71
·期 1
·91-105
·
IF 2.2
Jiang Lei,Sun Hongjuan,Peng Tongjiang,Du Juan,Xia Lingxi
Humic acid (HA) can cause environmental pollution, due to which, its removal from aqueous solutions has become an increasingly important issue. Although bentonite has an affinity for HA, the adsorption capacity of raw bentonite is still poor. As a commonly used organic modifier, 3-aminopropyltriethoxyorganosilane (APTES) exhibits excellent flocculation capability for HA. Therefore, the objective of the present study was to investigate the effectiveness of the addition of 3-aminopropyltriethoxyorganosilane (APTES) to raw bentonite to increase the adsorption of HA from aqueous solution. The experimental results showed that, when the solid-to-liquid ratio was 1:1, the amino-modified bentonite exhibited the highest adsorption capacity ( q max = 272.23 mg g -1 ). The adsorption affinity of amino-modified bentonite was mainly determined by the number of amino groups loaded onto its surface. The adsorption of HA on amino-modified bentonite occurred through electrostatic interactions and hydrogen bonding. These findings demonstrate the excellent potential of amino-modified bentonite in effectively remediating HA pollution.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMICAL PAPERS
·
2021
·Vol. 76
·期 1
·123-135
·
IF 2.097
Shen Qiang,Xu Min-Hong,Wu Tao,Pan Guo-Xiang,Tang Pei-Song
Accumulation of tetracycline (TC) in soul and aqueous environments threatens the ecology balance and human health. In this work, Magnetic bentonite (MB) modified with two kinds of starch (corn starch and carboxymethyl starch) were synthesized for removal of TC. The composite materials were characterized by XRD, SEM, VSM and FTIR techniques. The adsorption capacities of TC for raw bentonite (RB), magnetic bentonite (MB), corn starch modified magnetic bentonite (ST-MB) and carboxymethyl starch modified magnetic bentonite (CMS-MB) were evaluated with batch adsorption equilibrium experiments. The modeling of isothermal adsorption and kinetic adsorption for four materials was done. The fitting results shows adsorption of CMS-MB composite follows the Langmuir model and pseudo-second model. The CMS-MB composite showed the best adsorption performance with Langmuir theoretical adsorption maximum of 169.7 mg/g. The adsorbent CMS-MB can be easily separated by magnetic force from solution with extremely low turbidity. The adsorption mechanism was also discussed.
研究领域:
环境科学
·
材料科学
·
生物化学
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2015
·
IF 3
Yinghao Min,Yanmei Zhou,Min Zhang,Han Qiao,Qi Huang,Tongsen Ma
The removal of ionic liquid (1-butyl-3-methyl imidazolium chloride: BMImCl) was studied from aqueous solution by raw bentonite, acid-activated bentonite and organic-modified bentonite. These types of bentonite sample were characterized by FT-IR, TGA and XRD. The effects of contact time, BMImCl initial concentration, pH, ionic strength, and humic acid on the removal of BMImCl were investigated via batch adsorption experiments. The adsorption kinetics models were applied to predict the adsorption constants, and the kinetic data indicated that the pseudo-second-order model gave a better fit. Furthermore, the Langmuir, Freundlich and Temkin isotherms models were also introduced to describe adsorption process in order to obtain possible mechanism of the removal. The applied isotherms models demonstrated that the adsorption data of acid-activated bentonite samples were well described by Temkin adsorption isotherm, and the isotherm model of organic-modified bentonite was Langmuir adsorption isotherm. The adsorption experiments indicated that these bentonite samples might be applied in repair of soil and water contaminated by ionic liquids.
研究领域:
环境科学
·
土壤修复
·
水污染治理
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吸附材料
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环境功能材料
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DOI
高影响因子
CLAY MINERALS
·
2026
·
IF 2.1
Chao Li,Tie Geng,Zhen Wen,Jingrui Wei,Xinliang Li,Ming Duan,Shuai Liu
Oil-based drilling fluids (OBDFs) are widely used in high temperature ultra-deep wells, high
inclination wells, horizontal wells and various complex wellbores due to their excellent
lubricity, high temperature stability, salt tolerance, and contamination resistance. However,
the intrusion of drill cuttings during drilling destabilizes water-in-oil (W/O) emulsion drilling
fluids. Therefore, bentonite, a common component of drill cuttings, was selected to study the
factors influencing its dispersion stability in W/O emulsions. The macroscopic stability of the
system was evaluated via static observation, and the dispersion state was characterized using
optical microscopy. Additionally, the viscosity, contact angle of bentonite after adsorption of
different surfactants, interfacial tension, and the charge of the bentonite particles were
measured. Results indicate different surfactants affect dispersion stability through distinct
mechanisms. The system stabilized by a nonionic surfactant exhibited low interfacial tension
and the highest stability. Furthermore, dispersion stability increased with surfactant
concentration. Finally, binary surfactant systems were formulated with Span80. Calcium
stearate demonstrated a significant synergistic effect with Span80, enhancing the stability of
bentonite dispersed in the emulsion, with an optimal ratio of 1:1. The mechanism of stable dispersion of bentonite in oil was analyzed, providing theoretical guidance for improving the
stability of W/O emulsion drilling fluids during drilling operations.
Keywords: Bentonite, water-in-oil emulsion, surfactant, dispersion stability, oil-based
drilling fluids, interfacial tension.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Chandra Bhanu Gupt,Sanandam Bordoloi,Sreedeep Sekharan,Ajit K. Sarmah
Low hydraulic conductivity and high chemical immobilization are the two characteristics that make bentonite a mandatory construction material for hazardous waste containment applications. We performed a comprehensive batch sorption study on Barmer bentonite (BB), an exclusive construction clay mined in India, using lead (Pb 2+ ) as a model contaminant. The maximum adsorption capacity of BB was obtained as 55 mg g −1 at pH 5 and 27 ± 2℃. Adsorption was extremely rapid, with equilibrium attained <5 min for the BB. Increased adsorbent dosage resulted in higher Pb 2+ percentage removal, while adsorption capacity decreased. Ionic strength, salt concentration, valency and ionic radius played a critical role in suppressing the adsorption of Pb 2+ . Clay fabric change was observed to be dispersed at low ionic strength and gradually attained aggregated face-to-face structures at high ionic strength. The simultaneous presence of other metals/salts strongly influenced Pb 2+ removal by BB, while divalent salt exhibited high suppression of adsorptive reaction at low concentrations. Sorption isotherm and kinetic modeling results indicated the possibility of chemisorption of Pb 2+ on BB. Based on the thermodynamic analysis, it was noted that Pb 2+ adsorption on BB is exothermic, spontaneous and adsorption reaction is less favorable at a higher temperature.
研究领域:
环境科学
·
土壤学
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DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2017
·
IF 2.299
Sen Du,Luyan Wang,Ni Xue,Meishan Pei,Weiping Sui,Wenjuan Guo
The modified bentonite with a graft amount of 30% was prepared by polyethylenimine reacting with the epoxy bonds on the molecular of (3-Glycidyloxypropyl) trimethoxysilane and being grafted on the bentonite to remove amino black10B. The effects of pH, time, temperature and concentration on the adsorption capacity were studied. As the pH value increases from 3 to 10, the adsorption capacity decreased from 264.5 to 140.4 mg/g. The adsorption process reached equilibrium at 90 min when pH=3. The adsorption kinetics indicates that the adsorption process was very fast and in accordance with the secondary adsorption kinetics. The data about thermodynamic equilibrium was consistent with the Langmuir model. The adsorption process mainly depended on electrostatic attraction and hydrogen bonding and the adsorption data of Bent-PGLYMO-PEI showed that the maximum adsorption capacity reached 327.7 mg/g.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2016
·Vol. 310
·期 2
·671-678
·
IF 0.983
Li Shicheng,Wang Xiaoli,Huang Zhaoya,Du Liang,Zhang Dong,Tan Zhaoyi,Fu Yibei,Wang Xiaolin
In this study, we examined the sorption and desorption behavior of U(VI) on/from a Chinese bentonite in the solid–liquid system using batch experiments, and the influence of pH, ionic strength and humic acid (HA) on the sorption–desorption hysteresis in the solid–liquid system were quantitatively calculated. It was revealed that the hysteresis was enhanced with increasing pH and increasing ionic strength. HA promoted the sorption, but lower the sorption–desorption hysteresis. Meanwhile, hysteresis in ternary bentonite-HA-U system was found to be higher than that in bentonite-U-HA system, indicating different sorption structures formed because of different addition sequence.
研究领域:
环境科学
·
地球化学
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产品关联
DOI
高影响因子
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2023
·
IF 0.7
Zihao Meng,Jian Wu,Qingyun Li,Youyan Liu,Aixing Tang
Lipase OF from Candida cylindracea was adsorbed onto surfactant-modified Na-bentonite (Bent), and the effects of the surfactants on the catalytic properties of immobilized lipase were studied in detail. The results showed that both the specific activity and enzyme loading of immobilized lipase varied significantly with modified support of different surfactants. The highest specific activity was obtained with Tween20-modified Bent: 11.9-fold higher than the non-modified sample. Upon modification by a single surfactant, two kinds of surfactants were combined to process the modification. It was surprising to find that the enzyme immobilized on CTAB (60%) and TX-100 (40%) co-modified Bent yielded a specific activity recovery of 133.4% indicating that the enzyme might be “activated”. Kinetic analyses for the hydrolysis of p-nitrophenyl palmitate (p-NPP) showed that Km decreased from 5.57 mg mL−1 of free lipase to 3.43 mg·mL−1 and Vmax increased 1.35-fold higher. The structure, surface morphology, and hydrophobicity of the modified bentonite and immobilize lipase were characterized via X-ray diffraction, Fourier transform-infrared spectroscopy, scanning electron microscopy, and contact angle measurements. We assumed that lipase molecules may be bound to the surface of the carrier, and the surface hydrophobicity and the change of the functional group caused by the modification of surfactant may be the key factor affecting lipase immobilization.
研究领域:
生物化学
·
酶工程
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Yangchun Leng,Qintang Li,Qiang Tian,Xiaoyuan Chen,László Almásy,Yuliang Liu,Guangai Sun,Xianguo Tuo,Minhao Yan,Mark J. Henderson
The ability of bentonite and montmorillonite pillared by Al-oxide and mixed (Ln-Al)-oxides (Ln = La, Ce) to remove 239 plutonium solution species from water is comparatively investigated at pH 7 and pH 4. Small-angle scattering and neutron contrast variation with H 2 O/D 2 O mixtures is used to verify the ingress of water in the calcined products after hydrophilicity was introduced by an NH 3 -H 2 O vapor treatment. The size and shape of the (La/Ce)-Al oxo-hydroxy pillaring cations (2 nm spheres) is determined by small-angle x-ray scattering from the pillaring solutions. Not all of the oxide pillars improved Pu uptake compared with sodium montmorillonite. At neutral and acidic pH only (Ce-Al)-oxide pillared clays showed the ability to remove Pu over the concentration range studied (1.35 × 10 −8 –8 × 10 −8 mol dm −3 ) with distribution coefficient ( K D ) values >10 4 . XPS analysis of the (Ce-Al)-oxide pillared clays indicates the presence of Ce 4+ as cerium dioxide. The progressive improvement in sorption performance in the order of pillar type Al 2 O 3 < La 2 O 3 -Al 2 O 3 << CeO 2 -Al 2 O 3 reflects the increasing access of Pu solution species to the clay mineral layers by changes to the basal spacing and specific surface area, and also to the higher stability of the (Ce-Al)-oxide pillars.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 3
·502
·
IF 3.164
Wenjuan Guo,Tingcheng Xia,Meishan Pei,Yankai Du,Luyan Wang
The main object of this work is to remove Amido black 10B using a new type of bentonite-based adsorbent with cationic groups by the modification of polyallyl amines between the interlayers of bentonite. Fourier transform infrared, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy were used to characterize the functionalized bentonite. A series of batch adsorption experiments were performed. The maximum adsorption amount was 144.08 mg g−1when the pH was 2 and the contact time was 120 min. In addition, the equilibrium isotherm data were analyzed using Langmuir and Freundlich isotherm models, while only the Langmuir model could provide a high correlation. Therefore, this study provided a new functionalized bentonite as a low-cost adsorbent for dye removal from water.
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DOI
高影响因子
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