Journal of Water Process Engineering
·
2021
·
IF 5.485
Chuanbin Wang,Xiangping Li,Wenzhu Wu,Guanyi Chen,Junyu Tao
Cadmium emission from industrial processes is causing serious environmental problems, and biochar adsorption is an effective approach to control the cadmium content in wastewater. Producing biochar from Enteromorpha prolifera could not only provide sustainable biochar resource, but also promisingly solve the algae bloom problem worldwide. This work prepared Enteromorpha prolifera biochar (EPB) via slow pyrolysis method, the effect of different KOH to EPB mass ratios and different influencing parameters were also studied. Characterizations including SEM-EDS, FTIR and elemental analysis were comprehensively conducted to explore the physicochemical properties of EPB. The results showed that EPB activated by KOH with an impregnation ratio of 1:2 had the optimal cadmium removal performance, where a removal efficiency of 99.8% was obtained. Electrostatic interaction was a major adsorption mechanism. The isotherm analysis showed that Langmuir isotherm model could better fit the adsorption data. As a result, KOH activated EPB presented satisfactory features as a promising cadmium adsorbent with multiple environmental benefits.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Liying Jiang,Ke Li,Lingen Xia,Jiajun Gao,Lu Tang,Yanbo Jia
Hydrothermal carbonization (HTC) has been a promising treatment technology of heavy metal-enriched hyperaccumulator biomass to produce superior hydrochar adsorbent for contamination removal from the wastewater. However, a high amount of heavy metal in derived hydrochar limits its further application. In this study, the effect of reaction temperature (180–270 ℃) and medium pH during HTC on heavy metal contents, speciation and leaching risk of hydrochar from the hyperaccumulator biomass Sedum alfredii Hance was investigated to assess its environmental risk. HTC at a low reaction temperature and acid addition facilitated the removal of Zn/Cd/Pb from the solid phase, meanwhile the addition of acid favored the immobilization of Zn/Cd/Pb and lowered the potential leaching risk of Zn/Cd/Pb. Hydrochar prepared from HTC at 240 °C and pH = 2 had lower heavy metal content and lower releasing risk, followed by KOH modification to obtain high adsorption performance. The modified hydrohcar (KSAB) were characterized by SEM, XRD, BET, Boehm titration and FT-IR, and showed that the surface specific surface area and pore structure were optimized and OFGs of hydrochar were improved significantly after KOH treatment. Adsorption experiments showed that the Cd(II) adsorption process onto KSAB well accorded with pseudo-second-order kinetics and Langmuir isotherms. The maximum Cd(II) adsorption capacity of KSAB was 25.69 mg/g, which was 17 times compared to that of pristine hydrochar. Microstructure characteristics and mechanism analysis further suggested that electrostatic interactions, surface complexation, cation-π and ion exchange were the main Cd(II) removal mechanisms of KOH-modified hydrochar. Therefore, hydrochar derived from hyperaccumulator biomass can be used as a highly efficient absorbent to remove Cd(II) from wastewater after KOH modification.
研究领域:
环境科学
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污染治理
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材料科学
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产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2015
·Vol. 4
·期 2
·130-134
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IF 0
Gao Yupeng,Wang Libo,Li Zhengyang,Zhang Yafei,Xing Baolin,Zhang Chuanxiang,Zhou Aiguo
Two-dimensional (2D) carbide Ti 3 C 2 was synthesized by exfoliating Ti 3 AlC 2 in HF solution and used for supercapacitive performance investigation in 3 M KOH electrolyte. The specific surface area (SSA) of as-synthesized Ti 3 C 2 was 22.35 m 2 /g. Ti 3 C 2 -based supercapacitor electrodes exhibited good energy storage ability and had a volumetric capacitance 119.8 F/cm 3 at the current density of 2.5 A/g. Moreover, the addition of carbon black into Ti 3 C 2 powders greatly improved the performance of Ti 3 C 2 -based capacitors because carbon black restrained the preferred orientation of 2D Ti 3 C 2 , providing fast ion transport channels, and in turn, decreasing electrical resistance from 16.7 Ω to 3.5 Ω.
研究领域:
材料科学
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电化学
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产品关联
DOI
MOLECULES
·
2024
·Vol. 29
·期 9
·2024
·
IF 4.2
Xia Wang,Fanyuan Kong,Wulan Zeng,Huaxiang Zhang,Chunling Xin,Xiangjun Kong
Every late autumn, fluttering poplar leaves scatter throughout the campus and city streets. In this work, poplar leaves were used as the raw material, while H3PO4and KOH were used as activators and urea was used as the nitrogen source to prepare biomass based-activated carbons (ACs) to capture CO2. The pore structures, functional groups and morphology, and desorption performance of the prepared ACs were characterized; the CO2adsorption, regeneration, and kinetics were also evaluated. The results showed that H3PO4and urea obviously promoted the development of pore structures and pyrrole nitrogen (N–5), while KOH and urea were more conductive to the formation of hydroxyl (–OH) and ether (C–O) functional groups. At optimal operating conditions, the CO2adsorption capacity of H3PO4– and KOH–activated poplar leaves after urea treatment reached 4.07 and 3.85 mmol/g, respectively, at room temperature; both showed stable regenerative behaviour after ten adsorption–desorption cycles.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Carbon Capture Science & Technology
·
2025
·
IF 10.5
Tingwei Wang,Xuelong Quan,Zhiqiang Sun,Zhao Sun
Excessive CO 2 emissions lead to a gradual increase in global average temperatures and an increased frequency of extreme weather events. Exploiting advanced materials for CO 2 capture has become a key issue of concern to all countries. In this study, a new biomass carbonization strategy, co-modification by H 2 O 2 and KOH, is proposed to prepare microporous biochar from pine sawdust with high CO 2 adsorption capacity. Results indicate that the co-modification strategy can produce biochar with a specific surface area as high as 3522.7 m 2 /g (with a micropore ratio of 90.3%), which increases by 56.7% compared to the biochar produced by biomass carbonization without H 2 O 2 treatment. The adsorption properties of the co-modification-derived biochar are investigated by CO 2 -TPD and TG, and the biochar exhibits a maximum CO 2 adsorption capacity of 6.60 mmol/g at 30°C and retains over 91.2% of this capacity after 10 cycles. It is revealed that H 2 O 2 -KOH modification can significantly promote the physisorption capacity of the biochar, highlighting the enhanced CO 2 capture efficiency due to alkaline hydrogen peroxide treatment on the biochar and its enhancement in CO 2 capture.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Fuqiu Ma,Wenmin Zhu,Wanting Cheng,Jiaqi Chen,Jianzhang Gao,Yun Xue,Yongde Yan
In this study, the electrosorption property of potassium hydroxide modified activated carbon fiber felt (ACFF-KOH) to Co 2+ in simulated radioactive effluent was evaluated. Factors influencing the electrosorption such as applied voltage, initial concentration, pH, cyclic flow rate, competitive ions and cycle numbers on Co 2+ removal rate were investigated. Kinetic models and isotherm models were used to evaluate the electrosorption performance of ACFF-KOH. The results showed that the voltage enhanced the removal capacity of Co 2+ , which raised from 5.92 to 14.80 mg·g −1 when the applied voltage increased from 0 to 1.6 V. Higher initial concentration of the solution induced larger electrosorption capacity. In addition, the optimal adsorption pH of the electrosorption was around 5. When competing ions exist, the removal rate of Co 2+ decreased. Furthermore, ACFF-KOH had excellent cycling performance, and the removal rate remained above 85 % after 6 cycles. The pseudo-first-order (PFO) model fitted the data better than the pseudo-second-order (PSO) model, indicating that physisorption was the rate-limiting step during the eletrosorption process. A s the Langmuir isotherm had a higher regression coefficient (0.9983) than the Freundlich isotherm, monolayer adsorption was the main adsorption mechanism for Co 2+ on the ACFF-KOH electrode. The BET results showed that KOH modification improved the pore parameters of ACFF. According to the XPS and XRD results, Co(OH) 2 precipitates were generated on the electrode surface after electrosorption. The above results indicated that ACFF-KOH had excellent electrosorption and regeneration performance for Co 2+ in aqueous solution, thus it has great application value in the treatment of cobalt-containing radioactive effluent.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Shijin Dai,Libing Liu,Hongping He,Bo Yang,Deli Wu,Youcai Zhao,Dongjie Niu
Molten salt has been increasingly acknowledged to be useful in the destruction of chlorine-containing organic wastes (COWs), e.g., organochlorine . However, the operational temperatures are usually high, and local structure and thermodynamic property of the molten salt remain largely unclear. In this study, novel molten NaOH-KOH is developed for organochlorine destruction, and its eutectic point can be lowered to 453 K with 1:1 mol ratio of NaOH to KOH. Further experiment shows that this molten NaOH-KOH is highly-efficient towards the destructions of both trichlorobenzene and dichlorophenol, acquiring the final dechlorination efficiencies as 88.2% and 94.1%, respectively. The organochlorine destruction and chloride salt enrichment are verified by fourier-transform infrared spectrometer . Molten NaOH-KOH not only eliminates the C-Cl and C C bonds, but also traps generated CO 2 , other acidic gases, and possibly particulate matters as a result of the high surface area and high viscosity. This makes it possibly advantageous over incineration for organic waste destruction for carbon neutrality . To sufficiently reveal the inherent mechanism for the temperature dependent performance, molecular dynamics simulation is further adopted. Results show that the radial distance between ions increases with temperature, causing larger molar volume and lower resistance to shear deformation. Moreover, thermal expansion coefficient, specific heat capacity, and ion self-diffusion coefficient of the molten NaOH-KOH are found to increase linearly with temperature. All these microscopic alterations contribute to the organochlorine destruction. This study benefits to develop highly-efficient molten system for COWs treatment via a low-carbon approach.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2015
·Vol. 43
·期 10
·1569-1572
·
IF 0.754
Ming-Yan LUO,Bei LÜ,Guo-Bin SHEN,Fei-Fang ZHANG,Bing-Cheng YANG
Electrodialytic eluent generator, one of the key components of ion chromatography system, was fabricated and evaluated. The data achieved indicated that its performance could be comparable to that of commercial one. The maximal operation pressure was over 20 MPa, the generated KOH concentration was up to 100 mM, and the designed usage lifetime was about 354 day (take 8 h working time per day). This device will be helpful to the improvement of domestic instruments of ion chromatography.
研究领域:
分析化学
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仪器科学与技术
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分离科学
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离子色谱技术
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DOI
高影响因子
THERMOCHIMICA ACTA
·
2012
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IF 1.805
Yang Lu,Juan Han,Chengzhuo Sheng,Ping Yu,Zhenjiang Tan,Yongsheng Yan
The phase diagrams for the systems containing polyoxyethylene (10) lauryl ether (POELE10) and three salts (KOH, K 2 CO 3 and K 3 PO 4 ) have been determined experimentally. Three experiential equations were used to correlate the binodal data. The liquid–liquid equilibrium data of these systems were obtained by experimental method and calculated method using lever rule. The tie-line data were correlated by using Othmer-Tobias and Bancroft and simple Setschenow-type equations. Furthermore, the effect of salt on the binodal curve for the studied systems has been discussed by means of salting-out coefficient, effective excluded volume (EEV) and Gibbs free energy of hydration of the ions (Δ G hyd ). It was found that the salts composed of anion with a higher valence are better salting-out agents than those with a lower valence. The order of salting-out abilities of salts is K 3 PO 4 > K 2 CO 4 > KOH for the investigated systems. Finally, the phase-separation ability of POELE10 is more powerful compared with that of other polymers and two-phase can easily form at the lower concentration, which indicates that lower cost is a remarkable advantage of POELE10–salt ATPSs.
研究领域:
化学
·
生物学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shi Feng,Jing Guo,Qiang Yang,Fucheng Guan,Qiang Yao,Yonghe Wang,Fengyu Quan,Shijun Zeng
To solve the inherent problems of conductive hydrogels, such as relatively low mechanical properties and fatigue resistance, inability to work after water loss, and difficulty weaving. In this study, the borax-crosslinked polyvinyl alcohol/k-carrageenan (kC) conducting hydrogels (BPK KOH ) were prepared by a simple one-pot method, and KOH treatment was used instead of the cumbersome and time-consuming freeze-thaw cycle to improve the comprehensive properties. The KOH treatment increased the hydrogel hydrogen bonding content by 7.72 % and synergized with the induction of kC by K + to enhance the tensile and compressive strengths by 8.12 and 34.6 times, respectively. Meanwhile, the BPK KOH hydrogel's fatigue resistance and shape recovery after water loss were improved. Additionally, the BPK KOH hydrogels can be monitored for finger bending, showing clear and stable differences in electrical signals. BPK KOH hydrogels combined with Morse code realize applications in information transmission and encryption/decryption. Notably, introducing KOH ensures the molding and preparation of BPK KOH hydrogel fibers while having good signal responsiveness and monitoring ability. More importantly, it can be woven into fabrics that can be loaded with heavy weights, which has the potential to be directly applied in smart wearables. This work provides new ideas for applying flexible sensors and wearable smart textiles.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Small Methods
·
2025
·
IF 9.1
Zhaoxi Chen,Peng Wang,An Pei,Gaige Zhang,Daoru Liu,Peilin Sun,Guangxu Chen
Alkali-catalyzed hydrolysis effectively depolymerizes waste polyesters and recovers high-purity monomers. Nonetheless, the conventional acid-based neutralization process (ABNP) for polyesters recycling faces economic and efficiency challenges due to substantial alkali consumption. To address these challenges, this study developed an electrochemical recovery and separation system (ERSS), a three-chamber electrolyzer separated by cation exchange membranes (CEM), with an ion separation module (ISM) situated between the anode and cathode of a water electrolysis system. Through water electrolysis, the system can efficiently recover excess KOH from polyester hydrolysates by leveraging directed ion migration under an electric field. Experimentally, the system achieves outstanding performance in real PET hydrolysates, with a KOH Faraday efficiency of 96.4%, yielding 88.4% for ethylene glycol (EG) and 89.3% for p-phthalic acid (PTA). The system operates stably and continuously for 100 h, processing ≈6 liters of hydrolysate. Additionally, it has exceptional KOH recovery across multiple polyester hydrolysates. A techno-economic analysis (TEA) shows that compared to the traditional ABNP, the ERSS significantly reduces chemical input costs in the hydrolysis unit, achieving savings of up to 62.5%. This study provides an efficient and cost-effective solution for the alkaline hydrolysis recycling of waste polyesters, effectively mitigating the economic drawbacks of excessive KOH usage.
研究领域:
化学工程
·
环境科学
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材料科学
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电化学
·
聚合物回收
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产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 8
·4618-4624
·
IF 2.3
Zheng Xiaoxia,Wang Yinwei,Feng Xiao,Cao Jieqi,Gong Xinbin,Yu Weiqiang,Wang Xinhong,Shi Song
Heterogeneous solid base catalysts have attracted widespread attention for various reactions from the perspective of green and economy chemistry due to their advantages such as low corrosiveness, high reaction efficiency, and easy separation. The unique properties of polyacrylonitrile fibers (PANF) such as good mechanical strength and a surface rich in cyanine and economy make them suitable catalytic supports. Herein, potassium oxide was introduced into PANF by redox strategy. Characterization using XRD, FT-IR, solid-state 13 C NMR, XPS, SEM, CO 2 -TPD, etc. confirmed the successful preparation of this heterogeneous base catalyst and the participation of PANF in the redox process of KNO 3 to promote the decomposition of KNO 3 . The acquired catalyst showed obvious activity for the oxidation of methylene compounds and the yield of fluorenones can reach 100% at 100 °C. This strategy provides a new development path for the application of PANF and the synthesis of heterogeneous bases. Graphical Abstract
研究领域:
催化化学
·
绿色化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）