CELLULOSE
·
2022
·Vol. 29
·期 17
·9235-9249
·
IF 6.123
Wang Kaili,Li Xiaoran,Peng Haozhe,Dong Youming,Li Yanjun,Liu Xiaorong,Li Jianzhang
It is of great practical significance to prepare high-performance biopolymer composite films from renewable resources to replace ubiquitous petrochemical plastics. However, the unsatisfactory mechanical properties and single functionality of bio-polymers make them unable to meet the requirements of practical application. Herein, the tough, strong and renewable soy protein isolate (SPI) composite films with outstanding photothermal conversion and UV-blocking performance were prepared by facile blending and casting methods with integration of cellulose nanofibrils (CNF)@MXene hybrid nanosheets as reinforcers and branched polyethyleneimine (PEI) as a plasticizer. The resultant SPI/PEI/CNF@MXene films presented outstanding mechanical properties i.e., tensile strength of 17.31 MPa, toughness of 16.01 MJ/m 3 , high strain at failure of 114.10%. Furthermore, the SPI/PEI/CNF@MXene films can almost block 100% of UV spectrum and also exhibit satisfactory photothermal driven conversion. These comprehensive properties make it have great potential application as mulching films, packaging engineering, and UV-blocking fields.
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Journal of Environmental Sciences
·
2022
·
IF 6.796
Ying Cao,Juan Li,Yanxin Zhao,Yumeng Zhao,Wei Qiu,Suyan Pang,Jin Jiang
The degradation of metoprolol (MTP) by the UV/sulfite with oxygen as an advanced reduction process (ARP) and that without oxygen as an advanced oxidation process (AOP) was comparatively studied herein. The degradation of MTP by both processes followed the first-order rate law with comparable reaction rate constants of 1.50 × 10 − 3 se c − 1 and 1.20 × 10 − 3 se c − 1 , respectively. Scavenging experiments demonstrated that both e aq − and H • played a crucial role in MTP degradation by the UV/sulfite as an ARP, while SO 4 • − was the dominant oxidant in the UV/sulfite AOP. The degradation kinetics of MTP by the UV/sulfite as an ARP and AOP shared a similar pH dependence with a minimum rate obtained around pH 8. The results could be well explained by the pH impacts on the MTP speciation and sulfite species. Totally six transformation products (TPs) were identified from MTP degradation by the UV/sulfite ARP, and two additional ones were detected in the UV/sulfite AOP. The benzene ring and ether groups of MTP were proposed as the major reactive sites for both processes based on molecular orbital calculations by density functional theory (DFT). The similar degradation products of MTP by the UV/sulfite process as an ARP and AOP indicated that e aq − / H • and SO 4 • − might share similar reaction mechanisms, primarily including hydroxylation, dealkylation, and H abstraction. The toxicity of MTP solution treated by the UV/sulfite AOP was calculated to be higher than that in the ARP by the Ecological Structure Activity Relationships (ECOSAR) software, due to the accumulation of TPs with higher toxicity.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xinle Liu,Juhua Qin,Jing Wang,Yipeng Chen,Guohao Miao,Peiyao Qi,Jin Qu,Junping Zheng,Xiaofei Liu
The potential application prospects of conductive hydrogel-based flexible sensors in many emerging electronic devices have prompted intensive research on flexible hydrogel strain sensors to meet the needs of different application scenarios. Herein, by simply immersing PVA organohydrogel compounded with cellulose nanofibers (CNFs) and α-zirconium phosphate (α-ZrP) nanosheets in tannic acid (TA)/NaCl/water solvent, we prepared an organohydrogel strain sensor with excellent mechanical properties , anti-freezing and water-retention properties, transparency and UV filtration, and excellent strain sensing properties. The addition of CNFs and α-ZrP nanosheets could synergistically improve the mechanical properties of the organohydrogel and contributed to the enhancement of electrical conductivity with little effect on the transparency of the organohydrogel. TA was used as a physical cross-linking agent to further improve the strength of the organohydrogels (tensile strength of 5.37 MPa, toughness of 29.06 MJ/m 3 , elongation at break of 1057%) and as a UV filtering component to impart nearly 100% UV filtering performance to the organohydrogel. In addition, the organohydrogel exhibited an extremely wide linear (R 2 = 0.995) sensing range (650%), high sensitivity (GF = 2.78) and excellent cycling stability as a strain sensor to detect human motion. This integrated high-performance TA-PVA/ZC organohydrogel shows great potential for flexible sensors.
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PLoS One
·
2021
·Vol. 16
·期 10
·e0258483
·
IF 3.24
Wenping Dong,Chuanxi Yang,Lingli Zhang,Qiang Su,Xiaofeng Zou,Wenfeng Xu,Xingang Gao,Kang Xie,Weiliang Wang
This study investigates the degradation of nifedipine (NIF) by using a novel and highly efficient ultraviolet light combined with hydrogen peroxide (UV/H 2 O 2 ). The degradation rate and degradation kinetics of NIF first increased and then remained constant as the H 2 O 2 dose increased, and the quasi-percolation threshold was an H 2 O 2 dose of 0.378 mmol/L. An increase in the initial pH and divalent anions (SO 4 2- and CO 3 2- ) resulted in a linear decrease of NIF (the R 2 of the initial pH, SO 4 2- and CO 3 2- was 0.6884, 0.9939 and 0.8589, respectively). The effect of monovalent anions was complex; Cl - and NO 3 - had opposite effects: low Cl - or high NO 3 - promoted degradation, and high Cl - or low NO 3 - inhibited the degradation of NIF. The degradation rate and kinetics constant of NIF via UV/H 2 O 2 were 99.94% and 1.45569 min -1 , respectively, and the NIF concentration = 5 mg/L, pH = 7, the H 2 O 2 dose = 0.52 mmol/L, T = 20 ℃ and the reaction time = 5 min. The ·OH was the primary key reactive oxygen species (ROS) and ·O 2 - was the secondary key ROS. There were 11 intermediate products (P345, P329, P329-2, P315, P301, P274, P271, P241, P200, P181 and P158) and 2 degradation pathways (dehydrogenation of NIF → P345 → P274 and dehydration of NIF → P329 → P315).
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Han Chen,Tao Lin,Xiaoshu Yan,Hang Xu
The formation of haloacetonitriles (HANs) during chlorination after sulfite/ultraviolet (UV) treatment of bromate (BrO 3 − ) in the presence of amino acids (AAs) was investigated. During sulfite/UV treatment, the primary species hydrated electrons (e aq − ) and hydrogen atom radicals (H ) dominated the reduction of BrO 3 − to bromide (Br − ), whereas the sulfite anion radicals (SO 3 − ) and H degraded AAs to produce the intermediates HN=C(CH 3 )–COOH, CH 3 –CH=NH, and CH 3 –C≡N via α‑hydrogen abstraction and NH 2 –hydrogen abstraction mechanisms. During post-chlorination, Br − was converted to HBrO/BrO-, and the HN=C(CH 3 )–COOH, CH 3 –CH=NH, and CH 3 –C≡N groups featured higher bromine utilization factor (BUF) and chlorine utilization factor (CUF) values than AAs, enhancing the formation of dibromoacetonitrile (DBAN) and dichloroacetonitrile (DCAN). The energetic feasibility of the transformation pathway, that is, HN=C(CH 3 )–COOH, CH 3 –CH=NH, and CH 3 –C ≡ N formation via hydrogen abstraction by SO 3 − and H and their further conversion to HANs, was proved by density functional theory calculations, which showed stepwise negative Gibbs free energy changes (ΔG < 0). The effects of pH and water matrices (e.g., HCO 3 − , Cl − , Fe 3+ , and natural organic matter) were comprehensively evaluated. Although 72% of BrO 3 − was removed by sulfite/UV treatment in the presence of AAs, the cytotoxicity index (CTI) and genotoxicity index (GTI) during post-chlorination increased by 213% and 125%, respectively, due to the formation of 24 CX 3 R-type disinfection by-products (DBPs), especially brominated DBPs. Accordingly, more attention should be given to the formation of brominated DBPs during post-chlorination when using sulfite/UV processes to remove BrO 3 − in the presence of AAs. As a solution, using monochloramine instead of chlorine as a disinfectant after the sulfite/UV process could significantly lower the CTI and GTI values by alleviating the formation of brominated DBPs.
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Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 3
·586-596
·
IF 5.819
Zhiquan Li,Congwei Luo,Fengxun Tan,Daoji Wu,Xuedong Zhai,Shishun Wang,Xiaoxiang Cheng,Fumiao Zhang,Mingli Li,Qiao Ma
As an endocrine disruptor, bisphenol A (BPA) is a severe threat to human health. In this study, nitrate (NO3−) photolysis with a low-pressure UV lamp (LP-UV) was employed to degrade BPA in different aqueous solutions. Results showed that BPA could be decomposed efficiently in the UV/NO3− process. Moreover, the contributions of UV irradiation (4.1%), ˙OH (52.7%), and reactive nitrogen species (43.2%) were obtained. The observed rate constant of BPA degradation (kobs) increased with NO3− concentration since more active species were generated in high NO3− concentration. The BPA degradation rate was significantly accelerated as the pH value rose. This was ascribed to the increase of the molar absorption coefficient and the amount of ionic BPA under alkaline conditions. kobs declining with increasing BPA concentration resulted from the inner filter effect and the competition of more generated intermediate products. The increasing kobs with the addition of HCO3−/CO32− (0–10 mM) was explained as the accumulation of ˙NO2 in the presence of HCO3−/CO32− in UV/NO3− process. The effect of Cl− (0–20 mM) could be ignored in this study, which suggested that reactive chlorine radicals degraded BPA effectively. The kobs reduced acutely when NOM (0–5 mgC L−1) existed in the solution, and this could be ascribed to the dual roles of the NOM inner filter effect and reactive radical scavenging effect. Further, several degradation products were detected, and possible transformation pathways were put forward. Remarkably, the acute toxicity of BPA was slightly enhanced then decayed in the UV/NO3− process.
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POLYMER
·
2021
·
IF 4.43
Tao Zhang,Yajun Deng,Wenshuo Zhang,Guannan Wang,Yuye Zhong,Cheng Su,Houbin Li
To follow the sustainable tendency, natural resources have been attractive to fabricate the functional materials in various applications. In this present study, curcumin , a natural pigment, was used as a chain extender to synthesize a series of environmentally friendly waterborne polyurethane to prepare self-colored waterborne polyurethane films with excellent ultraviolet (UV) absorption properties. The effect of curcumin content on the performance of waterborne polyurethane film was investigated from the aspects of transparency, thermal stability and mechanical properties . The chemical structure of waterborne polyurethane was systematically characterized by Fourier transform infrared (FT-IR), gel permeation chromatography (GPC) and 1 H nuclear magnetic resonance ( 1 H NMR) spectrums. The transmittance of the WPU-0 without curcumin as control sample was 89.27%, in which the films WPU-1, WPU-2 and WPU-3 respectively decreased the transmittance to 87.69%, 84.38% and 76.89%, and absorbs nearly 100% in UVA (315–400 nm) and UVB (280–315 nm) radiations with increasing of the curcumin content. The thermogravimetric analysis (TGA-DTG) curves showed that the introduction of curcumin could effectively improve the thermal stability of different films. Besides, four waterborne polyurethane films were carried out the tensile stress-strain measurement to investigate the mechanical properties. When adding 6% curcumin chain extender, the stress of WPU-1 film increased to 28.73 MPa relative to the control sample WPU-0 which of the value was only 12.45 MPa. Beyond expectation, while adding 12% and 18% curcumin content, the stress of WPU-2 and WPU-3 films gradually decreased to 20.18 MPa and 11.48 MPa, respectively. In addition, as increasing 18% proportion of curcumin, the elongation at break gradually decreased, specifically, the value at 555% of the WPU-0 sharply reduced to 233% of the WPU-3, indicating that the brittleness of the curcumin-based waterborne polyurethane was increased. The results showed that the naturally green curcumin was incorporated into the waterborne polyurethane structure, and an environmentally-friendly waterborne polyurethane film with good mechanical properties and transparency could been obtained with its own color.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Yingxue Wu,Xianhong Zhang,Dong Chen,Yuhong Ma,Qin Wang,Jiadong Wang,Wantai Yang
Branched polyacrylamides (PAMs) have shown tremendous potential in wastewater treatment, papermaking, and oil drilling due to their unique molecular structure, remarkable shear stability, and effective flocculability. Efficient approaches for their industrial-scale production have attracted increasing attention. Herein, we report a facile, scalable, highly efficient, and cost-effective strategy for the production of branched PAMs through UV polymerization of acrylamide (AM) initiated with a novel water-soluble macro-photoinitiator. Through precipitation copolymerization of AM and 2-hydroxy-1-[4-(2-acryloyloxyethoxy)phenyl]-2-methyl-1-propanone (M2959), poly(AM-co-M2959)s bearing photoinitiator moieties on the backbone were successfully synthesized, which showed excellent water solubility and high photoinitiation efficiency. Most importantly, both the branching degree and main-chain length of the branched PAMs were controllable, given that the molar mass and photoinitiating group content of poly(AM-co-M2959)s could be effectively controlled by adjusting the monomer feed ratio of AM/M2959. The rheological properties of the resultant branched PAMs were characterized in detail, and excellent water solubility and shear resistance were observed, confirming the well-defined branched structure of the as-prepared PAMs. Due to their facile synthesis, simplicity of operation, and high photoinitiation efficiency, these novel macro-photoinitiators have great potential as a versatile platform for the preparation of various branched polymers containing different functional groups (not limited to branched PAMs).
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Lijian Sun,Jing Shen,Xianhui An,Xueren Qian
It is still a challenge to realize super clear cellulose-based film materials with different functional combinations. This study presents a novel concept of fabricating flame-retardant, mechanically strong, UV and blue light double-blocking carboxymethylated cellulose-based nanocomposite bioplastics enabled by nano-metal organic framework (MIL-125(Ti)-NH 2 ). Carboxymethylated cellulose gel with porous structure acts as nanoreactor and carboxyl groups as reactive sites to facilitate the growth and anchorage of nano-MIL-125(Ti)-NH 2 . Super clear bioplastics were obtained through hot-pressing. The results show that the neat carboxymethylated cellulose bioplastic possesses high transmittance (94.1% at 600 nm) and low haze (2.0% at 600 nm). The incorporation of nano-MIL-125(Ti)-NH 2 enabled nanocomposite bioplastics to obtain UV and blue light double-shielding capability meanwhile retaining high transmittance (79–92.8%) and low haze (2.6–7.2%). Moreover, the incorporation of nano-MIL-125(Ti)-NH 2 was found to significantly improve the mechanical strength and decrease the flammability of nanocomposite bioplastics. This facile strategy would direct nanocomposite bioplastics toward diversified applications.
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Qi Chen,Xiaorong Li,Yuan Xie,Weicheng Hu,Zhipeng Cheng,Hui Zhong,Hongjun Zhu
Herein, we demonstrate a novel UV-induced decomposable nanocapsule of natural polysaccharide (HA-azo/PDADMAC). The nanocapsules are fabricated based on layer-by-layer co -assembly of anionic azobenzene functionalized hyaluronic acid (HA-azo) and cationic poly diallyl dimethylammonium chloride (PDADMAC). When the nanocapsules are exposed to 365 nm light, ultraviolet photons can trigger the photo-isomerization of azobenzene groups in the framework. The nanocapsules could decompose from large-sized nanocapsules to small fragments. Due to their optimized original size (~180 nm), the nanocapsules can effectively avoid biological barriers, provide a long blood circulation and achieve high tumor accumulation. It can fast eliminate nanocapsules from tumor and release the loaded drugs for chemotherapy after UV-induced dissociation. Besides, HA is an endogenous polysaccharide that shows intrinsic targetability to CD44 receptors on surface of cancer cells. The intracellular experiment shows that the HA-azo/PDADMAC nanocapsules with CD44 targeting ability and UV-controlled intracellular drug release are promising for cancer chemotherapy.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Liuyang He,Lixin Lv,Suresh C. Pillai,Hailong Wang,Jianming Xue,Yongfei Ma,Yanli Liu,Yulin Chen,Li Wu,Zulin Zhang,Lie Yang
Iron/copper bimetallic nanoparticles based sludge biochar (Fe/Cu-SBC) was prepared by using a modified co-precipitation route. The Fe/Cu-SBC system prepared was subsequently applied to activate periodate (IO 4 − ) to degrade diclofenac sodium (DCF) by using UV light at room temperature (25 °C). The physicochemical properties of both SBC and Fe/Cu-SBC such as morphology, physical properties, crystal structures and functional groups were examined. The type and number of surface functional groups were found to be increased and the catalytic performance was improved by the modification of Fe/Cu bimetallic nanoparticles. The influence of various parameters to evaluate the catalytic efficiency such as periodate (PI) concentration, dosage of catalysts, UV power, initial pH and coexisting anions were investigated. Under the optimized conditions (pH 6.9, UV-power 60 W, PI concentration of 5 mM and 0.1 g Fe/Cu-SBC), it was observed that 99.7% of DCF was degraded with a pseudo-first-order kinetics reaction constant 9.39 × 10 −2 min −1 . The radical scavenging experiments showed that IO 3 radicals were the predominantly reactive oxidants in the Fe/Cu-SBC/UV system. Therefore, this investigation provides a feasible alternative for the degradation of PPCPs in wastewater.
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PLoS One
·
2021
·Vol. 16
·期 4
·e0249915
·
IF 3.24
Jing Han,Ze-Tian Qin,Jing Zhang,Wen-Qiang Wang,Jing-Ya Wu,Yong-Ze Lu,Li-Wei Sun
Ultraviolet (UV) filters are used in cosmetics, personal care products and packaging materials to provide sun protection for human skin and other substances. Little is known about these substances, but they continue to be released into the environment. The acute toxicity of 4,4’-dihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC to Chlorella vulgaris and Daphnia magna were analyzed in this study. The 96 h-EC 50 values of 4,4’-dihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC on C . vulgaris were 183.60, 3.50 and 0.16874 mg/L, respectively. The 48 h-LC 50 of 4,4’-dihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC on D . magna were 12.50, 3.74 and 0.54445 mg/L, respectively. The toxicity of a mixture of 4,4’-dihydroxybenzophenone and 4-MBC showed addictive effect on C . vulgaris , while the toxicity of mixtures of 4,4’-dihydroxybenzophenone and 2,4,4’-trihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC as well as 4,4’-dihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC all showed antagonistic effect on C . vulgaris . The induced no-effect concentrations of 4,4’-dihydroxybenzophenone, 2,4,4’-trihydroxybenzophenone and 4-MBC by the assessment factor (AF) method were 0.0125, 0.00350 and 0.000169 mg/L, respectively.
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