SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Siyu Wei,Wei Zhou,Rui Han,Jihui Gao,Guangbo Zhao,Yukun Qin,Chunhao Wang
Thermochemical heat storage has been successfully employed as a reliable solution for enhancing the utilisation of renewable energy. In this paper, we report novel composite sorbents fabricated by impregnating CaCl 2 into porous minerals with different structural properties. Sepiolite (SP), diatomite (DT), and expanded perlite (EP) were chosen as the mesoporous , macroporous , and foamed macroporous matrices, respectively. The pore structure of the matrix exerts a vital influence on the loading of salt hydrates and the performance of the composite material. EP/Ca had the highest energy storage density of 2166 J/g with a water exchange amount of 1.20 g/g, while the energy storage densities of SP/Ca and DT/Ca were 1026 J/g and 1520 J/g, respectively. The foamed macropores of EP provided more space for salt hydrate loading, whereas DT and SP only possessed mesoporous pores with limited pore volumes , thus contributing to lower salt hydrate content. Moreover, EP/Ca exhibited good structural stability during heat storage cycles because of the foamed macroporous structure. In contrast, the restrictive effect of the holes of DT on the salt solution was low, thus causing DT/Ca leakage and caking. Therefore, EP was chosen as the most suitable matrix for supporting salt hydrates. Moreover, this work presents an excellent perspective for exploring new sorption heat-storage materials with low cost, mass production, and high performance.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Lei Li,Guangxia Qi,Bangda Wang,Dongbei Yue,Yi Wang,Tsutomu Sato
A novel multifunctional composite adsorbent which possesses the ability for anion exchange and toxic metal complexation has been synthesized by the hybridization of layered double hydroxides (LDH) and fulvic acid (FA) in this study. The results show that FA with lots of functional groups can be effectively and stably anchored on the surface of LDH through coagulation process without occupying the interlayer of LDH. Therefore, the anion exchange ability remains and the adsorption capacity of Orange II can reach 1.9 mmol/g, which is almost as much as stoichiometric anion exchange capacity of pure LDH. Moreover, the composite adsorbent’s adsorption capacity of Cu 2+ , Pb 2+ , Ni 2+ and Cd 2+ can also get to 2.25 mmol/g, 0.98 mmol/g, 0.99 mmol/g and 0.16 mmol/g respectively with an adsorption preference order of Cu 2+ > Pb 2+ > Ni 2+ > Cd 2+ . In addition, Orange II and toxic metals are able to be simultaneously removed by this composite adsorbent, and the adsorption of toxic metals can be enhanced by the synergetic adsorption of Orange II. Anion exchange with Cl − in LDH matrix accounts for the adsorption of Orange II, while the adsorption of toxic metal is mainly attributed to the complexation of carboxyl functional group derived from FA.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Feifan Chen,Bo Zhang,Weihao Cai,Nengquan Fan,Yongkang Lu,Luxia Yin,ZeKai Zhang,Wensheng Ning
Ag/SiO2–Al2O3 aerogel composites with different molar ratio of Si to Al were prepared by the sol–gel synthesis followed by drying under atmospheric pressure and then characterized by XRD, FT-IR, BET, SEM, XRF, TG-DTG, and Py-FTIR, respectively. The effect of doping Al on their physicochemical properties and adsorption desulfurization performance was investigated in comparison with Ag/SiO2. The incorporation of Al in Ag/SiO2 resulted in a gradual decrease in the specific surface area, an increase in the actual content of Ag, and an appearance of Brönsted acid centers. The actual content of Ag in Ag/SiO2–Al2O3-n increased first and then decreased with the increase in Al content. Doping Al in Ag/SiO2 led to an improvement in the adsorption capacity and the adsorptive selectivity for thiophene at the presence of toluene and cyclohexene, as well as the solvent washing regeneration performance, attributed to the adsorption of thiophenics on Ag/SiO2–Al2O3-n by π-complexation of Ag(I) and the acid–base interaction of Lewis and Brönsted centers with thiophenics simultaneously, and the increase in the actual content of Ag in the adsorbents. Ag/SiO2–Al2O3-100 had the largest adsorption capacity for thiophene and benzothiophene, 12.2 mg of S/gads (0.57 mmol of S/mmol of (Ag + Al)) and 17.7 mg of S/gads (0.53 mmol of S/mmol of (Ag + Al)), respectively.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2024
·
IF 9.9
Aimin Li,Qiongfen Yu,Ming Li,Rong Zhu,Shengnan Sun,Danya Zhan,Xuewu Li,Yiping Xia,Zhihao Song,Xiaokang Guan,Yunfeng Wang
Solar drying is an energy-efficient and environmentally friendly method. However, during periods without sunlight, the lack of energy input to the dryer causes it to cease drying, leading to challenges such as water vapor condensation and product rehydration. To address this, our study proposed a continuous solar dryer (CSD) that integrated conventional solar drying with sorption thermal energy storage (STES), characterized by internal circulation dehumidification at night. The inclusion of adsorption beds within the dryer removed water vapor inside the drying chamber and released sorption heat to supply energy for continuous drying. A series of composite adsorbents was prepared based on an activated carbon fiber (ACF) matrix through impregnation and spraying methods. Among these, ACF-calcium alginate-1/1 (ACF-CA-1/1) was identified as the optimal adsorbent for system-scale preparation and then used for drying mushrooms. Experimental results showed that ACF-CA-1/1 exhibited an adsorption capacity of 0.45 g/g at 20 ℃ and 80 % relative humidity (RH), with an energy storage density of 676.7 J/g. During nighttime drying from 21:00 to 9:00, the adsorption beds facilitated a reduction of 2.64 kg water from 10 kg mushrooms, resulting in a moisture ratio decrease of 29.53 %. The average RH within the drying chamber with STES was 61.37 % and 45.46 % on the first and second nights, respectively. Furthermore, the overall energy efficiency and specific moisture extraction rate of the dryer with STES were 15.50 % and 6.9 × 10 −5 kg/kJ, respectively. Those of the dryer without STES were 14.23 % and 6.3 × 10 −5 kg/kJ for the same factors, respectively. Notably, solar drying with STES achieved a 30.74 % decrease in RH of drying chamber, an 8-hour reduction in drying time, and a 1.27 % increase in energy efficiency compared to solar drying without STES. Herein, the CSD effectively overcame the rehydration problem of agricultural products at night, offering a promising solution to the intermittent nature of solar drying.
研究领域:
食品科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xia Zhao,Hong Wang,Hong Peng,Linling Wang,Xiaohua Lu,Yanjun Huang,Jing Chen,Taikang Shao
Two buoyant ALG/HA/HGMs composite adsorbents, AHG(acid) and AHG(base), were prepared by encapsulating hollow glass microspheres and humate within alginate gel beads in this study. Both AHG(acid) and AHG(base) were characterized and their adsorption properties for removal of copper(II) ions from aqueous solution and kaolin soil were investigated. In aqueous solution, the maximum adsorption capacities of copper on AHG(acid) and AHG(base) were 34.8 and 40.4 mg g −1 , respectively, and the adsorption kinetics for AHG(acid) and AHG(base) followed the mechanism of the pseudo-second order kinetic model, and their equilibrium data were well fitted with the Langmuir isothermal model. The removal of copper from contaminated kaolin by AHG(acid) and AHG(base) was conducted by soil washing with deionized water containing buoyant adsorbents. As AHG(acid) could release hydrogen ions and reduce the pH value of the system consisting of adsorbent, water and kaolin, while AHG(base) could release hydroxide ions and increase the pH value of the system, the removal efficiency of copper from kaolin soil by AHG(acid) was much higher than that by AHG(base). Under soil washing conditions of the dosage of AHG(acid) of 3%, water/soil ratio of 3/1, and washing time of 48 h, the removal efficiency of copper from kaolin by AHG(acid) was 72.8%, and after 5 times reuse of AHG(acid) it was kept at 70%, while the pH value of kaolin soil was maintained in the pH range of 4.60–4.80. The results indicate that AHG(acid) has a potential application prospect in removing heavy metals from soil compared with AHG(base).
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Chengyue Yang,Jinwen Jiang,Ying Wu,Yong Fu,Yu Sun,Feng Chen,Guiyang Yan,Jianshe Hu
In this work, we developed a cheap and effective magnetic composite adsorbent ( MSP ) by introducing starch/polyethyleneimine to the surface of magnetic mesoporous silica. The prepared material was characterized by FT-IR, TG, XRD, SEM and TEM to determine its composition and morphology. Adsorption experiment showed that the removal rate of mercury(II) and adsorption capacity could reach 97.87% and 244.87 mg/g after 150 min. The kinetic study indicated that the adsorption data fitted well with the pseudo-second-order model, and the adsorption equilibrium data belonged to the Langmuir model. Meanwhile, the study of coexisting ions showed that MSP had a highly selective adsorption of mercury(II), and the adsorption capacity of the adsorbent after five times accounted for 91.27% of the initial adsorption capacity, which indicated magnetic nanomaterial manifested excellent selectivity and reutilization for mercury(II) adsorption. All in all, a feasible methods and cheap materials were implied to prepare a new magnetic composite adsorbent, and it will be a candidate for uptake of mercury(II) ions from industrial wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yanbo Pei,Menglin Li,Wei Li,Kai Su,Junmin Chen,Hongwei Yang,Daiyan Hu,Shengli Zhang
A cellulose-based composite adsorbent (PEI-PAM-CF) was fabricated via a facile cross-linking of polyethyleneimine/polyacrylamide (PEI/PAM) and cellulose using epichlorohydrin as the cross-linker. It possessed a double-network structure and emitted blue fluorescence. Compared with the control samples (PEI-CF and PAM-CF), the PEI-PAM-CF showed a synergy effect for the Cr(VI) removal. It can effectively remove Cr(VI) at low concentration with no structure destroyed for the adsorbent. Other coexisting anions (NO 3 - , Cl - , H 2 PO 4 - and CH 3 COO - ) and cations (Na + , K + , Mg 2+ , Ca 2+ and Cr 3+ ) had no significant effect on Cr(VI) removal except SO 4 2- . After five adsorption/desorption cycles, the Cr(VI) removal only decreased with a loss of 7%, suggesting that the PEI-PAM-CF had good regeneration performance. Most importantly, the electrostatic adsorption mechanism between Cr(VI) and the PEI-PAM-CF was revealed by a reversible fluorescence “on-off-on” phenomenon and the DFT calculation. The adsorption sites on the PEI-PAM-CF were attributed to the amino groups of the PEI and PAM . Hence, the PEI-PAM-CF was potential for the treatment of Cr(VI)-containing wastewater at low concentration.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2017
·Vol. 5
·期 2
·403-412
·
IF 4.036
Jian-Rong Li,Lei Xu,Ming-Lai Fu,Yun-Xia Wang,Hang Xiao
A facile strategy was designed to prepare magnetically layered chalcogenide Fe3O4/KMS-1 (FK) composite adsorbents combining the advantages of rapid magnetic separation and satisfactory adsorption performance under vigorous stirring in ethanol solution at room temperature. The dispersion degree of Fe3O4 in ethanol was superior to that in water, which gave a better result with the preparation in ethanol. Characterization by SEM-EDS, XRD, magnetic test, N2 physical-adsorption and TG-DTG demonstrated formation of FK and its adsorption performance. The results showed that the Fe3O4 microspheres could be well distributed over the surface of KMS-1 by electrostatic attraction in ethanol and the obtained FK could be easily separated from water after adsorption using a magnet. The pH slightly affected the adsorption capacity in the range of 3 to 6. Both KMS-1 and Fe3O4 retained their own original adsorption capacity in FK and FK0.3 was the best composite adsorbent when the mass ratio of Fe3O4 and KMS-1 was 0.3. As the amount of loaded Fe3O4 was decreased, the adsorption capacity of the composite adsorbents increased. The kinetic data of FK0.3 fit well with pseudo-second-order models. The co-existing ions had a slight effect on the removal of Zn(II) by FK0.3. The interlayer spacing of KMS-1 in FK increased from 0.851 nm to 1.123 nm after adsorption. The FK composite adsorbents can be considered as an excellent recoverable adsorbent in the treatment of wastewater.
研究领域:
材料科学
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环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Zhongli He,Bing Song,Cai Liang,Bin Liu,Zhirui Ma,Keliang Pang,Jiangang Yang
Concerns about arsenic emission issues are growing as the arsenic discharged from coal-fired power plants seriously endangers the ecological environment and public health. The gas-phase arsenic capture by a CaO–Ca12Al14O33 synthetic sorbent at 1000–1200 °C in the simulated flue gas was conducted, with the influence of the addition ratio of Ca12Al14O33, temperature, retention time, and acid gases NO/SO2 considered in the study. The results indicated that the synthetic sorbent containing 15 wt % Ca12Al14O33 (Ca85Al15) exhibited much better arsenic adsorption performance than CaO, which was ascribed to the greatly strengthened sintering resistance of CaO particles by adding Ca12Al14O33, enabling arsenic adsorption and chemical reactions. Both the increasing temperature and retention time facilitated arsenic adsorption by Ca85Al15, and the hypertoxic arsenic vapor (As3+) was converted into arsenate (Ca3(AsO4)2) with less toxicity. In the presence of NO, the arsenic capture was gradually suppressed with increasing retention time. On the other hand, SO2 could slightly facilitate the capture of arsenic at 1000–1100 °C for 10 min; nevertheless, due to the formation of Ca4Al6O12SO4, the promotion effect was inhibited at a higher temperature and a longer retention time. In general, the study provided a basis for developing highly efficient solid sorbents toward controlling arsenic vapor emission derived from coal combustion, and the appropriate conditions for arsenic capture were at 1000–1100 °C.
研究领域:
环境科学
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材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Xiao Teng,Bo Zhang,Luxia Yin,Wanyi Tao,Zhang Wen,Zekai Zhang,Wensheng Ning
A series of PdO/CeO 2 /SiO 2 -z aerogel composites with different molar ratio of Si/Ce were facilely fabricated via sol-gel method combined with atmospheric drying technology, where a major of Ce 3+ species could be oxidized to Ce 4+ species by adding hydrogen peroxide. They were used to remove thiophenics from model fuels and aromatics, compared with PdO/SiO 2 and CeO 2 /SiO 2 aerogel composites. Adding Ce and Pd led to an appearance of weak Lewis acid centers on the surface of adsorbents. Compared with PdO/SiO 2 and CeO 2 /SiO 2 , the adsorption capacity of PdO/CeO 2 /SiO 2 -z significantly increased, in which PdO/CeO 2 /SiO 2 -100 performed best and the adsorption capacity for thiophene was 15.0 mg-S/g ads , which was about the sum of PdO/SiO 2 -636 and CeO 2 /SiO 2 -100. The case was attributed to π-complexation of Pd 2+ and S-M (Pd, Ce, acted as Lewis acid centers) bond (σ) with thiophenics, where the adsorption process was dominated by S–Ce bond. Combined with the same chemical state of Pd and Ce in single metal and bimetal adsorbents verified by XPS , it can be deduced that no synergistic interaction between Pd and Ce species was formed in the adsorption process. PdO/CeO 2 /SiO 2 -100 exhibited a higher resistance for competitive adsorption of aromatics and a good solvent washing regeneration performance. The adsorption process of PdO/CeO 2 /SiO 2 -100 for thiophene was well fitted by Langmuir isothermal and pseudo-secound-order model and were spontaneous and endothermic. The solvents (n-heptane, benzene and p-xylene) have no obvious effect on the adsorption thermodynamics and kinetics of PdO/CeO 2 /SiO 2 -100.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Kun Zhou,Boran Wu,Lianghu Su,Wenshu Xin,Xiaoli Chai
Phosphate removal is an important measure required to control eutrophication of water bodies as it inhibits excessive algal growth. Currently available phosphate removal methods have various limitations and function poorly under wide pH ranges. This study successfully prepared and characterized a novel nanocomposite adsorbent, nHFZO@I402, which has high capacity and specific affinity towards phosphate. The nHFZO@I402 constituted of nanostructured hydrated ferric oxide and hydrated zirconium oxide loaded on the surface and inside the pores of a polymeric anion exchanger. Batch experiments were conducted to investigate the effects of varied conditions on phosphate adsorption. The results demonstrated that nHFZO@I402 achieved high phosphate removal efficiencies over a wide pH range (4–11), which indicates higher adaptability towards varying environmental conditions. In addition, nHFZO@I402 exhibited enhanced phosphate adsorption capacity regardless of coexisting anions (chloride, nitrate, sulfate, and carbonate) at different concentrations. Kinetic analysis suggested that the adsorption process best-fitted with the pseudo-second-order kinetic model, suggesting chemical sorption mechanism. Furthermore, the underlying mechanism of phosphate adsorption by nHFZO@I402 was assessing through XPS analysis. Phosphate removal was effected by the replacement of hydroxyl groups by phosphate species and interaction between ammonium groups and phosphate. In general, these results indicated that nHFZO@I402 is a highly efficient adsorbent for phosphate removal with excellent adaptability to varying and undesirable environmental conditions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yan Zhang,Haryo Wibowo,Li Zhong,Mika Horttanainen,Zunbo Wang,Caimeng Yu,Mi Yan
High CO 2 content exists in the raw syngas produced from supercritical water gasification of food waste, CO 2 removal to improve quality of the syngas is necessary before further utilization. In this study, Cu-BTC, Mg/Cu-BTC, Cu-BTC@MWCNT, and Mg/Cu-BTC@MWCNT were synthesized and characterized as CO 2 adsorbents. The adsorption experiments were conducted to investigate the optimal adsorbent and adsorption conditions. The results indicated that Mg 2+ and multi-walled carbon nanotubes (MWCNT) doped into Cu-BTC influenced the physical properties of adsorbents. Among of all studied adsorbents, Mg/Cu-BTC@MWCNT had the maximum CO 2 adsorption capacity (3.63 mmol/g) and selectivity (14.28) at 25 °C and 100 kPa. Analysis of variance (ANOVA) exhibited that adsorption pressure had significant effects on CO 2 adsorption capacity of Mg/Cu-BTC@MWCNT. The influences of different operating parameters on CO 2 adsorption capacity and selectivity were discussed in Mg/Cu-BTC@MWCNT. The adsorption isotherms of gas components on Mg/Cu-BTC@MWCNT can be sorted as follows: CO 2 > CO > CH 4 > H 2 . In additional, the regeneration experiment with 5 times was conducted and the result showed that Mg/Cu-BTC@MWCNT has high stability.
研究领域:
材料科学
·
环境工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）