PROCESS BIOCHEMISTRY
·
2018
·
IF 2.616
Ganggang Chong,Junhua Di,Jianghao Qian,Chu Wang,Yucai He,Xiaoyu Huo,Changhai Wu,Lin Zhang,Ziwei Zhang,Yajie Tang,Cuiluan Ma
To decrease alkaline dosage and increase the enzymatic saccharification of sugarcane bagasse (SB), dilute mixed alkali salts soaking (0.5% K 2 CO 3 , 0.068% K 2 SO 3 ) in an autoclave at 100–125 °C for 10–60 min was attempted to pretreat SB. The increased pretreatment severity at elevated temperatures resulted in the increase of delignification and enzymatic saccharification. It was found the optimum pretreatment temperature and pretreatment time were 120 °C for 40 min. Furthermore, FTIR, XRD and SEM characterized the porosity, morphology, and crystallinity changes of the pretreated SB samples. After the enzymatic in situ saccharification of 50 g/L SB in dilute K 2 CO 3 /K 2 SO 3 (0.35% K 2 CO 3 , 0.048% K 2 SO 3 ) media for 72 h, the reducing sugars and glucose could be obtained at 32.94 and 20.18 g/L, respectively. Finally, the SB-hydrolysates containing 20 g/L glucose were used for ethanol fermentation in the presence of dilute alkali salts. After 48 h, the ethanol yield was 0.394 g ethanol/g glucose, which represents 77.25% of the theoretical yield. In conclusion, an effective process about the biomass pretreatment, enzymatic saccharification and ethanol fermentation was successfully demonstrated in “one-pot” media containing low loading of alkali salts K 2 CO 3 /K 2 SO 3 .
研究领域:
生物能源
·
生物质转化
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Siji Chen,Bolun Zhang,Yuhan Xia,Huan Chen,Guang Chen,Shanshan Tang
Edible fungus substrate (EFS) is a kind of agricultural waste produced by the cultivation of edible fungus. Improper handling of a large quantity of EFS may lead to environmental pollution. In this work, three porous carbon materials (PCEFS), derived from EFS, were prepared using simple techniques, including carbonization and chemical activation. Three types of alkalis were used as activators to investigate the different physicochemical properties of PCEFS (PCEFS-MA, PCEFS-K, and PCEFS-Na), which aims to clarify the influence of mixed alkali (MA) on the preparation method. The textural characterization of the PCEFS showed that the treatments produced some of changes, especially in the surface area and the structure of pores. Besides, synthetic dye Rhodamine B (RhB) was selected as the model dye to test the adsorption properties, including the effects of pH, the adsorption kinetics, and the adsorption isotherms. Moreover, the maximum adsorption capacities of 1497 mg g −1 , 1103 mg g −1 , and 1055 mg g −1 for PCEFS-MA, PCEFS-K, and PCEFS-Na at the pH value of 9 were observed, which were higher than some of the contemporary adsorbents. This study has given evidence that MA can serve as an efficient activator for preparing porous carbon material.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Ning Li,Yan-Ling Xing,Zhi-Hong Liu
Two pure mixed alkali metal borates with Non-Linear Optical (NLO) properties, Li 6 Rb 5 B 11 O 22 and Li 4 Cs 3 B 7 O 14 , have been synthesized by a high-temperature solid state reaction, and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of Li 6 Rb 5 B 11 O 22 and Li 4 Cs 3 B 7 O 14 in 1 mol · dm −3 HCl (aq), and of LiCl·H 2 O(s) in (1 mol · dm −3 HCl + H 3 BO 3 + RbCl/CsCl) (aq) have been determined by microcalorimeter at T = 298.15 K, respectively. From these data and with the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol · dm −3 HCl (aq), together with the use of the standard molar enthalpies of formation for LiCl·H 2 O(s), RbCl(s)/CsCl(s), H 3 BO 3 (s), HCl(aq) and H 2 O(l), the standard molar enthalpies of formation of −(11173.1 ± 9.5) kJ · mol −1 for Li 6 Rb 5 B 11 O 22 and −(7145.1 ± 5.9) kJ · mol −1 for Li 4 Cs 3 B 7 O 14 were obtained on the basis of the appropriate thermochemical cycles.
研究领域:
化学
·
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2017
·
IF 2.002
Muhammad Ali Khan,Yan-Yan Li,Shang-Xiong Huang-Fu,Hong Chen,Li-Jun Zhang,Peng-Fei Liu,Ju-Song Yu,Rui-Huan Duan,Ling Chen
A new anhydrous mixed alkali metals borophosphate, Li 3 Cs 2 BP 4 O 14 , has been synthesized by the solid-state reaction. Single crystal X-ray diffraction analysis reveals that the title compound crystallized in a tetragonal geometry with space group of P 4 2 / mbc (No. 135) and cell parameters of a = 10.3413(5) Å, b = 10.3413(5) Å, c = 12.042(2) Å. Its one-dimensional (1D) chain structure is constructed by fundamental building unit (FBU) of [B(P 2 O 7 ) 2 ] 5− which contains P–O–P connections with B:P = 1:4. Thermal analysis, UV–Vis-near-IR diffuse reflectance spectroscopy, IR spectroscopy and theoretical calculations have been well performed on this new borophosphate compound.
研究领域:
材料科学
·
晶体学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
·
2013
·
IF 1.989
Ning Li,Rui-Bin Zhang,Zhi-Hong Liu
Two pure mixed alkali/alkaline earth metal borates with three-dimensional framework, LiBaB 9 O 15 and NaBaB 9 O 15 , have been synthesized by high-temperature solid state reaction, and characterized by XRD, FT-IR, DTA–TG techniques and chemical analysis. The molar enthalpies of solution of LiBaB 9 O 15 and NaBaB 9 O 15 in 1 mol L −1 HCl(aq), and of LiCl·H 2 O(s)/NaCl(s) in [1 mol L −1 HCl + H 3 BO 3 + Ba(OH) 2 ·8H 2 O](aq) have been determined by microcalorimeter at 298.15 K, respectively. From these data and with the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol L −1 HCl (aq), together with the use of the standard molar enthalpies of formation for Ba(OH) 2 ·8H 2 O(s), LiCl·H 2 O(s)/NaCl(s), H 3 BO 3 (s), HCl(aq) and H 2 O(l), the standard molar enthalpies of formation of −(6796.8 ± 7.3) kJ mol −1 for LiBaB 9 O 15 and −(6829.9 ± 7.3) kJ mol −1 for NaBaB 9 O 15 were obtained on the basis of the appropriate thermochemical cycles.
研究领域:
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Jun-Feng Wang,Xiao-Lan Wang
Two mixed alkali-alkaline earth metal borates of NaSrBO 3 and KSr 4 B 3 O 9 have been synthesized by high-temperature solid state reaction, which were further characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of NaSrBO 3 (s) and KSr 4 B 3 O 9 (s) in 2.00 cm 3 of 1 mol · dm −3 HCl(aq), at T = 298.15 K were measured to be −(206.84 ± 0.43) kJ · mol −1 and −(494.59 ± 0.53) kJ · mol −1 , respectively. The molar enthalpy of solution of NaCl(s) in 2.00 cm 3 of {1 mol · dm −3 HCl + H 3 BO 3 + Sr(OH) 2 · 8H 2 O}(aq) mixed solvent at T = 298.15 K was measured to be (5.17 ± 0.02) kJ · mol −1 . From these data and with the incorporation of the previously determined enthalpies of solution of H 3 BO 3 (s) in HCl(aq) of Sr(OH) 2 · 8H 2 O(s) in (HCl + H 3 BO 3 )(aq), and of KCl(s) in {HCl + H 3 BO 3 + Sr(OH) 2 · 8H 2 O}(aq), together with the use of the molar enthalpies of formation for NaCl(s)/KCl(s), Sr(OH) 2 · 8H 2 O(s), H 3 BO 3 (s), HCl(aq) and H 2 O(l), the standard molar enthalpies of formation of NaSrBO 3 (s) and KSr 4 B 3 O 9 were calculated to be −(1653.1 ± 1.4) kJ · mol −1 and −(5071.1 ± 3.4) kJ · mol −1 on the basis of the designed thermochemical cycles, respectively.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 26
·9088-9102
·
IF 4.39
Bei Xue,Yao Guo,Zhaofeng Huang,Shengyue Gu,Qian Zhou,Wei Yang,Kezhi Li
In this study, a novel NixCo3−xO4 nanotube array hierarchical structure derived from zeolitic imidazolate frameworks (ZIFs) is grown on Ni foam (NixCo3−xO4 NAHS/Ni foam) using the template-assisted and self-assembly approach for a high-performance hybrid energy storage device in alkaline solution. The material characteristics of the resultant samples were characterized by XPS, XRD, ICP, SEM, TEM and BET. Due to the unique hollow structure with a large specific surface area and the exposure of large active sites originating from ZIFs, the optimal NixCo3−xO4 NAHS/Ni foam exhibits substantially enhanced electrochemical properties. The NixCo3−xO4 NAHS/Ni foam directly acts as an electrode, which provides an excellent specific capacity of 290.48 mA h g−1 at 1 A g−1. Subsequently, the corresponding hybrid alkaline batteries that consist of NixCo3−xO4 NAHS/Ni foam and carbon materials display a highly satisfactory specific capacity of 54.94 mA h g−1 at 1 A g−1, a satisfactory long-term stability of 85.47% after 2000 cycles, a maximum energy density of 43.95 W h kg−1 and a power density of 8000 W kg−1. This work combines the design of the electronic structure with the optimization of composition, and provides a reference for the application of hybrid rechargeable alkaline batteries (RABs).
研究领域:
材料科学
·
能源存储与转换
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Yuhe Zhou,Guocan Zheng,Zuohua Liu,Renlong Liu,Changyuan Tao
The leachate of waste phosphogypsum (PG) contains substantial amounts of phosphate, sulfate, and fluoride, which poses an immense threat to the safety of the aquatic ecosystem . In this study, a multi-stage precipitation approach is proposed to treat PG leachates using hybrid alkaline reagents including barium hydroxide (Ba(OH) 2 ) and quicklime (CaO). To avoid potential environmental impacts, hazardous environmental contaminants are removed from the PG leachates by adding alkaline reagents in a specific order. The multi-stage precipitation approach achieves nearly 100% removal efficiencies for phosphate, fluoride, and metal ions as well as satisfactory removal efficiencies for sulfate and ammonia nitrogen (93.6% and 94.8% respectively). The compositions of generated mineral precipitates are comprehensively investigated by analytical techniques including X-ray diffraction (XRD), transmission electron microscope (TEM), etc. The main precipitated mineral phases are barite (BaSO 4 ), brushite (CaHPO 4 ·2H 2 O), and hydroxyapatite (Ca 5 (PO 4 ) 3 OH). This is further proven by the geochemical modeling using Visual MINTEQ, in which the precipitation of mineral phases is calculated. Furthermore, a straightforward economic analysis indicates the proposed method has a lower cost of the use of alkaline reagents. Overall, this study establishes an effective and eco-friendly approach for the treatment of waste PG leachates to remove hazardous environmental contaminants and recover valuable precipitates.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Xinyue Wang,Jinhui Wang,Xinyuan Zhang,Fei Liang,Zhanggui Hu,Yicheng Wu
Cyanurate anions are promising functional bulding blocks for birefringent materials. In this work, two new isocyanurates with mixed alkali cations were successfully synthesized by a hydrothermal method, namely, RbK(H2C3N3O3)2·2H2O (I) and Cs3Li(H2C3N3O3)4·3H2O (II). Compounds I and II are both featured with two-dimensional layers constructed by an isocyanurate six-membered ring extending along the bc plane. The characterization results show that both of these two new compounds exhibit wide band gaps (Eg ∼ 5.2 eV) and giant birefringence (Δn > 0.3) simultaneously. Moreover, theoretical calculations are performed to evaluate the relationship between microscopic structures and their anisotropic optical properties, indicating that the π-conjugated groups make a dominant contribution to the optical anisotropy. These findings demonstrate that the combination of alkali cations and merits of π-conjugated (iso)cyanurates would promote the study of optical integrated devices for emerging photonic technologies.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 13
·2302662
·
IF 8
Quanhua Lin,Xianqiu Lin,Xu Feng,Wangming Yang,Jiajia Tan,Wenjie Qiu,Shunchun Yao,Zhifeng Chen,Jianrong Qiu,Shifeng Zhou
The rational control of intrinsic defects in materials can significantly enhance their scientific and technological potentials, but it remains a long-standing challenge in nanocrystal-in-glass composites (NGCs). Herein, a defect engineering strategy mediated by the mixed alkali effect is proposed and experimentally demonstrated for NGCs. Interestingly, the hybridization of large alkali ions can effectively increase the barrier of Li + migration and reduce the Li-related defects in LiNbO 3 NGC. As a result, a novel LiNbO 3 NGC with greatly reduced Li-related defects, high crystallinity of over 60%, and excellent optical transmission are successfully fabricated. This unique NGC configuration facilitates efficient transverse second harmonic generation (TSHG) in a broad wavelength region. Based on the above effects, a standard TSHG device is fabricated and implemented to monitor ultrashort optical pulses with duration in the order of ≈10 −13 s over a broad wavelength region, down to 780 nm. The proposed strategy not only provides a new idea for defect engineering in materials science but also has great significance for boosting the practical applications of NGCs in ultrashort optical pulse monitoring.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 37
·6518-6525
·
IF 3.545
Qi-Ming Qiu,Guo-Yu Yang
Three new mixed-alkaline-metal borates, namely KNa8[Li@B12O18(OH)6](CO3)2 (1), Cs10[Li@B12O20(OH)2]2·6H2O (2) and Cs5[Li@B12O20(OH)2]·3H2O (3), have been synthesized under hydro/solvothermal conditions. Compound 1 is a borate carbonate with the isolated [Li@B12O18(OH)6]5− clusters and interesting layers formed by Na+ and CO32− ions, forming a 2D supramolecular structure with a 3,6-connecting binodal system. After changing the synthetic conditions, the isolated [Li@B12O18(OH)6]5− clusters are successfully extended to the layers in 2 and 3 by condensation reactions with the elimination of water molecules between oxoboron clusters. Each new fundamental building block [Li@B12O22(OH)2]9− in 2 and 3 connects with four neighboring units to form a 2D layer via B–O–B bonds for the first time, and 14-membered rings are also observed. Such a layer structure is first observed in dodecaborates. Since compound 3 crystallizes in the non-centrosymmetric space group, the second harmonic generation measurement and the dipole moments calculation have been carried out.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Qian Wang,Fei Yang,Xing Wang,Jing Zhou,Jia Ju,Ling Huang,Daojiang Gao,Jian Bi,Guohong Zou
By introduction of K+, Rb+, and Cs+ cations into the classical commercial nonlinear optical crystal LiB3O5 (LBO), the series of novel mixed-alkali-metal borates Li2.6K0.4[B5O8(OH)2] (K-LBO), Li2.85Rb0.15[B5O8(OH)2] (Rb-LBO), and Li2.9Cs0.1[B5O8(OH)2] (Cs-LBO) have been obtained under hydrothermal conditions. The steric hindrance effect generated by the introduction of large alkali-metal cations and partial substitution of small Li+ cations broke the three-dimensional (3-D) framework of [B3O7]5– borate–oxygen clusters in LBO and resulted in a structure rearrangement to produce infrequent [B10O26]22– 2-D layers. The unique layered structure induced an increase in birefringence in A-LBOs (A = K, Rb, Cs), which is favorable for phase matching during second-harmonic generation. All three compounds are potential deep-ultraviolet nonlinear optical materials, which was proved by UV–vis–NIR diffuse reflectance spectroscopy and second-harmonic-generation measurements.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）