Materials
·
2023
·Vol. 16
·期 9
·3356
·
IF 3.4
Yanfei Chen,Yuanlin Chen,Lei Zhang
The present study aimed to investigate the influence mechanism of carboxymethyl cellulose (CMC) on the flotation of fine chlorite. To this end, a series of flotation tests, sedimentation tests, and microscope analyses were conducted. Flotation tests revealed an inverse relationship between particle size and the recovery of chlorite, indicating that finer particles exhibited higher recovery rates. Moreover, it was observed that the recovery of fine chlorite was significantly associated with the water recovery (proportion of water entering the floated product to the weight of water in the initial flotation suspension) and a variety of frother types. Based on these findings, it can be inferred that froth entrainment may constitute a crucial component of the recovery mechanism underlying fine chlorite. Thus, reducing froth entrainment (the phenomenon of hydrophilic minerals entering floated products through foam water) is the key to depress chlorite flotation. Flotation tests indicate that fine chlorite recovered into froth products can be depressed effectively by CMC with a high molecular weight. The results of sedimentation tests and microscope analyses in the presence of CMC prove that CMC with a high molecular weight generates flocculation on fine chlorite particles while that with a low molecular weight does not. It is suggested that the depression of chlorite flotation may be attributed to the reduction in the entrainment resulting from the flocculation induced by CMC.Keywords:chlorite;carboxymethyl cellulose;entrainment;flocculation
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Guangyong Zeng,Liyi Zhang,Benkun Qi,Jianquan Luo,Yinhua Wan
Avicel cellulose was pretreated using two commonly used carboxylic acid-based deep eutectic solvents, i.e., choline chloride-lactic acid and choline chloride-formic acid. The pretreatment process resulted in the formation of cellulose esters with lactic acid and formic acid, which was confirmed by infrared and nuclear magnetic resonance spectra. Surprisingly, the esterified cellulose led to a significant decrease in the 48-h enzymatic glucose yield (≥75%) compared to raw Avicel cellulose. Analysis of changes in cellulose properties caused by pretreatment, including crystallinity, degree of polymerization, particle size and cellulose accessibility, contradicted the observed decline in enzymatic cellulose hydrolysis. However, removing the ester groups through saponification largely recovered the reduction in cellulose conversion. The decreased enzymatic cellulose hydrolysis by esterification may be attributed to changes in the interaction between cellulose-binding domain of cellulase and cellulose. These findings provide valuable insights into improving the saccharification of lignocellulosic biomass pretreated by carboxylic acid-based DESs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yinan Li,Jun Wang,Jiajia Guo,Chenglong Fu,Liulian Huang,Lihui Chen,Yonghao Ni,Qinghong Zheng
Actuators are widely used in bionic devices and soft robots, among which invisible actuators have some unique applications, including performing secret missions. In this paper, highly visible transparent cellulose-based UV-absorbing films were prepared by dissolving cellulose raw materials using N -methylmorpholine-N-oxide (NMMO) and using ZnO nanoparticles as UV absorbers. Furthermore, transparent actuator was fabricated by growing highly transparent and hydrophobic polytetrafluoroethylene (PTFE) film on regenerated cellulose (RC)-ZnO composite film. In addition to its sensitive response to Infrared (IR) light, the as-prepared actuator also shows a highly sensitive response to UV light, which is attributed to the strong absorption of UV light by ZnO NPs. Thanks to the drastic differences in adsorption capacity between the RC-ZnO and PTFE materials for water molecules, the asymmetrically- assembled actuator demonstrates extremely high sensitivity and excellent actuation performance, with a force density of 60.5, a maximum bending curvature of 3.0 cm −1 , and a response time of below 8 s. Bionic bug, smart door and the arm of excavator made from the actuator all exhibit sensitive responses to UV and IR lights.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Aihua Qiao,Renliang Huang,Jiangjiexing Wu,Wei Qi,Rongxin Su
Oily sewage caused by oil spill accidents has become a severe problem in the last decades. Hence, two-dimensional sheet-like filter materials for oil/water separation have received widespread attention. Porous sponge materials were developed using cellulose nanocrystals (CNCs) as raw materials. They are environmentally friendly and easy to prepare, with high flux and separation efficiency. The 1,2,3,4-butane tetracarboxylic acid cross-linked anisotropic cellulose nanocrystalline sponge sheet (B-CNC) exhibited ultrahigh water fluxes driven by gravity alone, depending on the aligned structure of channels and the rigidity of CNCs. Meanwhile, the sponge gained superhydrophilic/underwater superhydrophobic wettability with an underwater oil contact angle of up to 165.7° due to its ordered micro/nanoscale structure. B-CNC sheets displayed high oil/water selectivity without additional material doping or chemical modification. For oil/water mixtures, high separation fluxes of approximately 100,000 L·m −2 ·h −1 and separation efficiencies of up to 99.99 % were obtained. For a Tween 80-stabilized toluene-in-water emulsion, the flux reached >50,000 L·m −2 ·h −1 , and the separation efficiency was above 99.7 %. B-CNC sponge sheets showed significantly higher fluxes and separation efficiencies than other bio-based two-dimensional materials. This research provides a facile and straightforward fabrication method of environmental-friendly B-CNC sponges for rapid, selective oil/water separation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2023
·
IF 4.1
Ning Shi,Tianlang Zhu,Hongyan Zhang,Hongsheng Huang,Liang Zhou,Ying Liu,Riyang Shu
Catalytic conversion of cellulose into the novel platform molecule 2,5-hexanedione (HXD) is regarded as one feasible approach for high-value utilization of biomass resources. Here, we reported one efficient way of one-pot conversion of cellulose into HXD with high yield of 80.3% in H2O and tetrahydrofuran (THF) mixture within Al2(SO4)3 combined with Pd/C as a catalyst. In the catalytic reaction system, Al2(SO4)3 could catalyze the conversion of cellulose into 5-hydroxymethylfurfural (HMF), and Pd/C combined with Al2(SO4)3 could catalyze the hydrogenolysis of HMF into furanic intermediates such as 5-methylfurfuryl alcohol and 2,5-dimethylfuran (DMF) without causing over-hydrogenation of these furanic intermediates. These furanic intermediates were finally transformed into HXD catalyzed by Al2(SO4)3. Besides, the H2O/THF ratio could significantly influence the reactivity of the hydrolytic furanic ring-opening of the furanic intermediates. The catalytic system also showed excellent performance on the conversion of other carbohydrates (glucose and sucrose) into HXD.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2023
·
IF 4.7
Guixing Wang,Xiaona Liu,Zhaoping Song,Dehai Yu,Guodong Li,Huili Wang,Shaohua Ge,Wenxia Liu
Flexible pressure sensors have attracted widespread attention in recent years due to their potential applications for health monitoring and human–machine interfaces. However, the fabrication of environmentally friendly and well-performing pressure sensors using biobased materials remains a great challenge. Herein, a compressible carbon aerogel was prepared by sequential microfibrillation, periodate oxidization, and tannic acid (TA) cross-linking of cellulose fibers (CFs) followed by freeze-drying the as-prepared CF suspension and high-temperature pyrolysis of the obtained CF aerogel. The microfibrillation endows the carbon aerogel with a hierarchical structure, which improves the bonding strength and compressibility of the carbon aerogel. Periodate oxidation and TA cross-linking improved the mechanical properties of the carbon aerogel, while pyrolysis endowed the carbon aerogel with excellent conductivity, enabling the carbon aerogel to be a good pressure-sensing material. When assembled into a pressure sensor, the sensor shows a high sensitivity of 4 kPa–1, a fast response/recovery time of 32/30 ms, a low-pressure detection limit of 0.8 Pa, and good stability and excellent reproducibility (3000 cycles at 0.5 kPa). Moreover, the pressure sensor can be used to accurately monitor various human activities and also spatially resolve pressure variations when integrated into a sensor array. The pressure sensor also responds linearly to increased temperature and humidity. These results suggest that this hierarchical carbon aerogel-based pressure sensor has great potential for application as a multifunctional sensor.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Xiang Ma,Shuang Zhou,Junting Li,Fei Xie,Hui Yang,Cheng Wang,Bradley D. Fahlman,Wenjiang Li
Cellulose-based carbon aerogels as biodegradable and renewable biomass materials have presented potential applications in oil/water separation. Herein, a novel carbon aerogel composed of natural microfibrils/regenerated cellulose (NM/RCA) was directly prepared by economical hardwood pulp as raw material using a novel co-solvent composed of deep eutectic solvent (DES) and N-methyl morpholine-N-oxide monohydrate (NMMO·H 2 O). In addition, the morphology and structure of the filiform natural microfibers could be remained after carbonized at 400 ℃, which resulted in a low density (8–10 mg cm −3 ), high specific surface area (768.89 m 2 g −1 ) and high sorption capability. In addition, the aerogel exhibited high compressibility , outstanding elasticity, excellent fatigue resistance, and recyclability (80.5% height recovery after repeating 100 cycles at the strain of 80%). Due to the morphology and composition of the carbonized microfiber surface, the superhydrophobic materials with a water contact angle of 151.5°, could sorb various oils and organic solvents with 65–133 times its own weight and maintain 91.9% sorption capacity after 25 cycles. In addition, the aerogels could achieve the continuous separation of carbon tetrachloride (CCl 4 ) from water with a high flux rate of 11,718.8 L m −2 h −1 . Therefore, our prepared NM/RCA aerogels are anticipated to have broad potential applications in oil purification and contaminant remediation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yide Liu,Kai Li,Jiuyong Yao,Xiankai Li,Yanzhi Xia
Nanocomposite conductive fibers are of great significance in applications of wearable devices, smart textiles, and flexible electronics. Integration of conductive nanomaterials into flexible bio-based fibers with multifunctionality remains challenging due to interface failure, poor flexibility, and inflammability. Although having broader applications in textiles, regenerated cellulose fibers (RCFs) cannot meet the requirements of wearable electronics owing to their intrinsic insulation. In this study, we constructed conductive RCFs fabricated by coordinating copper ions with cellulose and reducing them into stable Cu nanoparticles coated on their surface. The Cu sheath offered excellent electrical conductivity (4.6 × 105 S m–1), electromagnetic interference shielding, and enhanced flame retardance. Inspired by plant tendrils, the conductive RCF was wrapped around an elastic rod to develop wearable sensors for human health and motion monitoring. The resultant fibers not only form stable conductive nanocomposites on the fiber surface by chemical bonds but also exhibit a huge potential for wearable devices, smart sensors, and flame-retardant circuits.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 31
·2301870
·
IF 19
Dingding Zong,Wenya Bai,Xia Yin,Jianyong Yu,Shichao Zhang,Bin Ding
The expeditious growth of modern transportation and industrialization has given rise to serious noise pollution, which has brought disaster to the world economy and human health. Most existing sound-absorber with single pore structures suffer from large weight and the incidence and dissipation of noise that are difficult to be enhanced simultaneously. Herein, gradient-structured elastic ceramic nanofiber aerogels with cellulose nano-nets are successfully structured through step-by-step directional freeze-casting technology, which has a gradient structure of “larger pore-middle pore-smaller pore” in the propagation direction of sound waves and dual nanofiber networks perpendicular to the direction of sound waves. The integration of gradient pore structures and dual nanofiber networks effectively improves the acoustic contact area of aerogels while increasing the acoustic incidence. The noise reduction coefficient of the obtained lightweight gradient aerogels (average density only 9 mg cm −3 ) reaches 0.58, and the low-frequency air compressor noise can be reduced by 23.1 dB. Besides, the silica sol with hydrophobic groups endows gradient aerogels with good mechanics (plastic deformation only 5.7% after 1000 compressions) and superhydrophobic properties (water contact angle of ≈150°). The successful construction of gradient-structured dual network nanofiber aerogels will offer new horizons for the upgrading of nextgen noise absorbers.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Mei Chen,Pingxiong Cai,Yuanfeng Pan
Agrochemicals play an irreplaceable role in the process of agricultural production. However, unreasonable use of agrochemicals can cause serious harm to the environment. Therefore, the controlled release of agrochemicals is critical in the sustainable development of agriculture and benefiting the environment. In this work, a composite hydrogel was prepared from dialdehyde cellulose and reinforced by polyvinyl alcohol (PVA) while cysteamine dihydrochloride acted as a cross-linking agent to render the hydrogel pH and redox-responsive for the controlled release of a model agrochemical, i.e., salicylic acid (SA). The aldehyde content in the modified cellulose reached 10.65 mmol/g while the yield of oxidized cellulose was 55%. The structure, morphology and properties of the composite hydrogels were characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). In addition, the release behavior of SA loaded in the hydrogels under various different conditions was also studied. The results showed that the addition of PVA could improve the mechanical properties of hydrogels, and the cumulative release of SA could be modulated by varying release conditions or environmental stimuli; and the release kinetics was well fitted with the Korsmeyer-Peppas model. Moreover, the release of SA could be promoted under acidic conditions and in the presence of reducing agent glutathione (GSH). The findings from this work particularly benefit the agricultural production.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Hao Ling,Lei Wang,Qixuan Lin,Quanbo Huang,Xiaoqian Zhang,Junli Ren,Ning Li,Cheng Zhou,Zhiwei Lin,Jingpeng Zhou,Wenguang Wei,Xiaohui Wang
Separating films with both high efficiency and large flux are desperately needed to meet the rising demand for the treatment of oily wastewater, while traditional oil/water separation papers with high separation efficiency usually suffered from low flux due to the unsuitable size of filtration pores. Herein, we report a bio-based porous, superhydrophobic , and antimicrobial hybrid cellulose paper with tunable porous structures for high flux oil/water separation. The size of pores in the hybrid paper can be tuned by both physical supports provided by the chitosan fibers and the chemical shielding supplied by the hydrophobic modification. The hybrid paper with increased porosity (20.73 μm; 35.15 %) and excellent antibacterial properties can efficiently separate a wide range of oil/water mixtures, solely by gravity, with outstanding flux (maximum of 23,692.69 L m −2 h −1 ), tiny oil interception, and high efficiency of over 99 %. This work provides new sights in the development of durable and low-cost functional papers for rapid and efficient oil/water separation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Anxiang Chen,Xia Li,Wenjia Han
In this study, we prepared spherical cellulose nanocrystals (S-CNCs) and stabilized n-hexadecane Pickering emulsions in conjunction with graphene oxide (GO), exploring the interaction between S-CNCs and GO in the emulsions. Both S-CNCs and GO are amphiphilic and synergistically stabilize Pickering emulsions by adhering to the surface of oil droplets and within the emulsion space through hydrogen bonding. GO's two-dimensional sheets assemble into a 3D network structure, further improving the stability of Pickering emulsions. Consequently, the stability of Pickering emulsions can be adjusted by altering the S-CNCs/GO ratio, modifying the spatial distribution relationship of stabilizers in the emulsions. At an S-CNCs concentration of 1 g/L and a GO concentration of 3 g/L, the Pickering emulsion demonstrated excellent stability and exhibited no delamination after 31 days of storage. Thus, the S-CNCs/GO combination serves as an effective Pickering emulsion stabilizer, utilizing the synergistic effect between the two components.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）