NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Haixia Li,Hai Zhu,Junqiang Qiu,Danning Zheng,Lifang Gao,dan zhou,Dan Xu
Overuse of antibiotics cause environmental pollution, and activated carbon adsorption was an effective way to remove antibiotics from polluted water. Herein, a cost-effective biomass carbon adsorbent for adsorption of chloramphenicol (CHL) was prepared from pomelo peel using KHCO3 activator. The activated carbon boasted a significant specific surface area (SBET) of 1608 m2·g-1 with a maximum adsorption capacity (Qmax) for CHL reaching 549.5 mg·g-1. The effect of adsorption behavior on adsorption capacity was studied. The adsorption process followed the pseudo-second-order kinetic and Langmuir model. Combined with FT-IR and XPS methods, the adsorption action included both physical adsorption and chemical adsorption. The rate-limiting step was diffusion through boundary layer. The adsorption mechanism mainly included processes pore filling, functional group binding, hydrogen bond and π-π interaction. Thermodynamic parameters demonstrated the spontaneous and exothermic properties. This work demonstrated the rational application of waste biomass carbon for efficient adsorption of antibiotics, which can provide a new help for antibiotic removal from polluted water.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Shining Zhang,Xikai Qiao,Jiangtao Wei,Guoyue Fu,Zijun Ma,Weiyi Zhang,Jiayu Zheng,Qinglan Hao,Haihong Bao,Jie Chang,Botao Teng
Two-electron water oxidation reaction (2e-WOR) is a promising approach to produce H 2 O 2 under mild conditions without pollution. Despite of the crucial roles of electrolytes in 2e-WOR, the effects of electrolytes on the performance and reaction pathway remain in debate and seldom reported. In this work, the effects of KHCO 3 and K 2 CO 3 electrolytes on the reaction pathways in 2e-WOR reactions were systematically explored using experimental approaches and DFT calculations. Our results highlight that the crucial distinction in 2e-WOR reaction mechanism lies in the formation of CO 3 ·- , which arises from the reactions of ·OH with HCO 3 - in KHCO 3 but ·OH with CO 3 2- in K 2 CO 3 . DFT calculations reveal that H 2 O 2 formation via ·OH+CO 3 2- →CO 3 ·- +OH - in K 2 CO 3 is more thermodynamically favorable than that via ·OH+HCO 3 - →CO 3 ·- +H 2 O in KHCO 3 . This finding aligns well with experimental results showing a significantly higher H 2 O 2 generation rate in K 2 CO 3 compared with KHCO 3 . Moreover, another pathway of OH - -e→·OH followed by 2·OH→H 2 O 2 at the anode was unanimously ruled out, as no H 2 O 2 was detected in KOH electrolyte and the high endothermicity of OH - -e→·OH (Δ E = 2.95 eV) was verified by DFT calculation. ·OH plays a crucial role in 2e-WOR by reacting with CO 3 2- or HCO 3 - to form CO 3 ·- , as well as the subsequent formation of HCO 4 - , which ultimately hydrolyzes to produce H 2 O 2 . This work provides a novel insight into the reaction mechanism of 2e-WOR in different electrolytes, laying a solid foundation for the design of high-efficient electrolytes and the development of high-performing catalysts, as well as the optimization of operational conditions in the 2e-WOR process.
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Qing-Shuai Zhang,Yu-Le Wang,Li Yue,Yu-Dong Shan,Song-Hai Wu,Yong Liu,Xu Han
Although selective oxidation of benzene to phenol (SOBP) by H2O2 is an important chemical process, overoxidation of benzene by the produced nonselective •OH during the activation of H2O2 inevitably reduces the oxidation selectivity. We, therefore, attempt to mediate the oxidation selectively by using electrophilic KHCO3 in the oxidation system. In this study, Mo–Cu/NC has been successfully synthesized via ball-milling bimetallic Mo–Cu and N-doped carbon, which exhibits high reactivity in SOBP by H2O2 and KHCO3 with a desirable phenol yield of 25.1% and selectivity of 100%. A series of characterizations and DFT calculations reveal that the reaction between H2O2 and KHCO3 produces HCO4–, which is then moderately activated on Mo1Cu2/NC via the nonradical pathway with the formation of Mo-(η2-O2) peroxo. Meanwhile, Ov at Mo1Cu2/NC facilitates the adsorption of benzene, which is then selectively oxidized by Mo-(η2-O2) peroxo to phenol via the oxygen atom transfer pathway. This study provides new insights on the importance of Mo-(η2-O2) peroxo mediated by H2O2–KHCO3 in selective oxidation of aromatic C–H bond via the nonradical pathway.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2022
·
IF 5.64
Aihua Liu,Xiner Lu,Xinying Zhou,Cicong Xu,Xiaoqing Liang,Kairong Xiong
An efficient KHCO 3 /zeolite composite powder was prepared mechanochemically for methane explosions suppression. The suppression performance of the composite powder was investigated using a 20 L spherical explosion system. The suppression mechanism was elucidated by the analysis of pyrolysis characteristics, explosion products, and KHCO 3 suppression kinetic model . Results indicate that the composite powder significantly improved dispersion and exhibited suppression performance better than KHCO 3 . The addition of 0.1 g/L of the composite powder with 45 wt% KHCO 3 loading had excellent inhibition effect in different concentrations explosion, and for 7 vol% methane explosion, it performed the best inhibition effect, where the maximum explosion pressure ( P max ) and maximum explosion pressure rise rate ((d P /d t ) max ) were reduced by 85.76% and 94.59%, respectively. The suppression effects of KHCO 3 /zeolite composite powder involved the endothermic and barrier effects, adsorbing free radicals and consuming of H and OH radicals by Na + and KHCO 3 decomposition products.
研究领域:
化学工程
·
安全科学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2024
·
IF 4.5
Xiaoqing Liang,Xinying Zhou,Xiner Lu,Aihua Liu
Exploring the application of slag in methane explosion suppression can contribute to its waste resource utilization. In this study, waste slag was subjected to high-temperature scorching and modified using the sol-gel method. Subsequently, a mechanochemical technology was employed to create a composite powder consisting of KHCO 3 and modified slag. A 20 L explosion ball was also used to assess the features of explosion suppression, and pyrolysis characteristics and explosion products were analyzed to clarify the underlying mechanism. The best explosion suppression was shown by adding 0.1 g/L 40 wt% of KHCO 3 /modified slag composite powder. It reduced P max and (d P /d t ) max by 42.35% and 89.47%, respectively, while extending the time for the flame to reach the edge of the transparent window by a factor of 7.1 in 9.5% methane explosion. The KHCO 3 /modified slag composite powder efficiently suppresses explosions by absorbing heat, creating barriers, and adsorbing and consuming free radicals.
研究领域:
材料科学
·
能源安全
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 2
·1-18
·
IF 3.8
Deng Yu,Chen Jingfan,Xiao Zhidan,Liu Jiaying,Zhang Jie,Zhu Bingqi,You Xiaotong,Ni Fuquan,Ao Tianqi,Tan Yanping
N self-doped porous biochars (KBCs) were synthesized through high-temperature carbonization and KHCO 3 activation using chicken feathers as biomass. Subsequently, it was employed for the remediation of tetracycline hydrochloride (TC)-contaminated water and soil. The properties of KBCs were analyzed by various characterization techniques. The results verified that KBC 800-2 exhibited outstanding specific surface area (1648.89 m 2 g −1 ) and pore volume (0.806 cm 3 g −1 ). The maximum adsorption capacity of KBC 800-2 for TC was 147.8 mg g −1 , which was superior to that of raw biochar (15.5 mg g −1 ). The results of pseudo-second-order and Freundlich indicated that the process was dominated by chemisorption. Moreover, the adsorption capacity of KBC 800-2 was stable over a wide pH range of 3–12 and high coexisting ionic strength. The consequences proved that the enhancement of pore filling effect and π-π electron interactions between TC and N self-doped adsorbent were the predominant driving forces to improve the adsorption efficiency of TC. Notably, compared to T50 (soil and 50 mg kg −1 TC), the properties of organic carbon, total nitrogen, and sucrase, urease, and catalase activities in TKBC 800-2 (soil, 50 mg kg −1 TC, and 2% KBC 800-2 ) were increased by 108.57%, 4.98%, 886.08%, 89.52%, and 78.08% respectively. KBC 800-2 as a low-cost and highly effective adsorbent for antibiotic pollution has enormous application potential. Graphical
研究领域:
环境科学
·
材料工程
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化学工程
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污染修复
·
吸附技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qiao Xu,Yinsong Si,Rui He,Xiaoming Qi,Xiuping Su,Yaqin Fu
Fast and safe electric heating is highly needed in extreme climates or thermal therapy. Herein, porous activated carbon derived from silk waste is prepared by a simple method. Various porous activated carbons are obtained using different types and concentrations of activator (KOH, KCl, and KHCO3). The effect of the microstructure on the electric heating performance of these carbons is investigated carefully. The type, activator concentration, and carbonization temperature play key roles in the regulation of electric heating properties. The porous carbon activated by 0.05 M KHCO3 at 800 °C demonstrates larger specific surface area (3077 m2 g–1), higher graphitization degree, and lower resistance (2.4 Ω cm), which synergistically contribute greatly to its higher electrothermal efficiency and better electric heating performance. The equilibrium temperature could reach 73 °C in 2 min under a safe voltage of 12 V, proving the better pore-forming capacity and activating function of KHCO3. An electric heating cotton@carbon composite fabric with quite good electric heating property and stability is also prepared, which could reach 38 °C in 2 min under 12 V safe voltage and maintain a temperature 10 °C higher than the ambient temperature even when bent at an angle of 55°. This activated carbon derived from waste protein using a simple and cheap process has great potential in practical applications.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2020
·
IF 4.966
Minggao Yu,Xueyan Wang,Kai Zheng,Shixin Han,Chuandong Chen,Rongjun Si,Lei Wang
Methane explosion threats the safety in mining, gas recovery and the related downstream industry. The present study examined the suppression effect of KHCO 3 (K) modified montmorillonite (K/MMT) inhibitor on reducing the hazard of methane/air mixtures explosion. The characteristic indices of explosion containing the maximum pressure (P max ), the maximum rate of pressure rise ( (dP/dt) max ), the time of pressure peak arriving ( t max ), were experimentally obtained in a standard 20 L explosion device. The hazard mitigating effect of each modified inhibitor was evaluated. which also elucidated the inhibition mechanism based on the characteristic parameters of K/MMT. Results showed that the K/MMT demonstrates better suppression effect than monomer inhibitor and the maximum decrease of P max (34.9 %) and (dP/dt) max (94.4 %) occurs when 45 wt% KHCO 3 are loaded (45 wt%-K/MMT). When 45 wt%-K/MMT is used, 0.125 g/L is the optimal concentration to decrease K G to a minimum of 0.849 MPa m/s. This work presents an efficient modified inhibitor by using innovative technology, which is applied to mitigate or prevent disaster. The technology also provides theoretical support and technical guidance for the future development of inhibitors.
研究领域:
矿业安全
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Greenhouse Gases-Science and Technology
·
2018
·Vol. 9
·期 1
·10-18
·
IF 1.991
Wei Liu,Ye Wu,Tianyi Cai,Xiaoping Chen,Dong Liu
Global climate change resulting from substantial CO 2 emissions is increasingly attracting attention, and coal-fired power plants are a major source of CO 2 emission, so it is necessary to control and reduce CO 2 emissions from power plants. Using alkali-based solutions for CO 2 capture is thought to be an effective method to achieve this but poor CO 2 sorption/desorption kinetics inhibit its development. The use of nanofluids, prepared by adding nanoparticles to an alkali-based solution, is a promising way to improve CO 2 sorption/desorption reactivity because the addition of nanoparticles not only improves the gas-liquid mass/heat transfer but also enhances the reaction kinetics. In this paper, a nanostructured Cu/TiO(OH) 2 was prepared and used to accelerate the CO 2 sorption/desorption performance of a potassium-based solution. The CO 2 sorption/desorption reaction rates increased with the thermal conductivity of the nanofluid but the inclusion of more nanoparticles resulted in particle sedimentation. The potassium-based solution containing 0.014 vol% of the nanostructured Cu/TiO(OH) 2 was therefore the targeted nanofluid that gave the best CO 2 sorption/desorption performance and cyclic stability. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
·
2020
·Vol. 235
·期 4
·451-466
·
IF 2.03
Yuli Xue,Yan Zhang,Xiaoling Tan,Wenqing Li,Zhongshu Li,Shaonan Xu,Peng Zhang,Jian Wang,Peiping Zhang,Shiding Miao
It is of importance to reclaim single-salt of potash from Li + -type brines of low concentration. In this work the potassium salts KHCO 3 was efficiently separated from the lithium carbonate-type brines with the aid of CO 2 carbonation. The phase field was provided in which the precipitation of KHCO 3 occurs and single-salt of potassium can be obtained. The low concentration of [Li + ] was also successfully concentrated to a high level (8.1 g/L), and this concentration can be used as sources for Li + -salts production using pre-developed strategies, which looks forward wider applications of the lithium resources of natural brine. This state-of-art was traced via isotherm evaporation on the quaternary system of Li + –K + –CO 3 2− –H 2 O at 298.15 K in which the carbonation steps were performed by CO 2 . Metastable phase diagram was found to consist of three invariant points, seven univariant curves, and four crystallization fields corresponding to Li 2 CO 3 , KHCO 3 , potassium carbonate sesquihydrate (K 2 CO 3 ⋅ 3/2H 2 O), and a potassium carbonate and potassium bicarbonate double salt (K 2 CO 3 ⋅ 2 KHCO 3 ⋅ 1.5H 2 O). There was no crystallization field corresponding to LiHCO 3 . The pH-composition diagram and density-composition diagram were also plotted. This work was carried out in aim of extracting/separating single salts of alkali metals from carbonate-type brines of west China.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2024
·Vol. 16
·期 2
·554
·
IF 3.3
Xin He,Honghao Wang,Chunlei Tang,Hong Yan,Hua Jin
Iron hydroxyl sulfate minerals (IHSMs, including schwertmannite and jarosite) are a promising material for environmental applications with excellent adsorption of metal oxygen anions. The acid mine drainage (AMD) abundant in iron and sulfate ions holds potential for the production of valuable IHSMs, thereby achieving resource recycling whilst simultaneously mitigating water contamination, which is important for the sustainable remediation of AMD. Conventional mineralization, which promotes the generation of minerals from Fe3+and SO42−through the energy provided by chemical or biological oxidation, can only partially mineralize iron in AMD containing substantial quantities of Fe2+. In this study, an improved method for mineralizing AMD containing iron of a different valence into IHSMs under the induction of KHCO3was proposed. For AMD containing Fe2+, the combination of KHCO3and H2O2was used to promote the hydrolysis of iron (92.7%) and sulfate (11.1%) into IHK minerals, which resulted in a significant increase in iron removal of 75.2% and a minor increase in sulfate removal of 4.9%, compared with the formation of schwertmannite from oxidation solely involving H2O2. For the AMD containing Fe3+, the energy generated by the acid–base reaction in water could also directly promote the formation of IK minerals from 97.2% iron and 6.9% sulfate. XRD and FTIR analyses confirmed the identification of the IHK and IK minerals as IHSMs transitioning from schwertmannite to jarosite. SEM and elemental analyses indicated that the mineral exhibited denser aggregate spheres with the incorporation of KHCO3in mineralization yet displayed enhanced mineralization abilities for the contaminant ions in AMD. Moreover, despite the SSA of the modified minerals being diminished (2.02, 1.83 and 1.83 m2/g for IH, IHK and IK, respectively), the presence of more sulfate in the mineral enhanced the adsorption capacity of Cr(VI). Furthermore, the water quality results also illustrated that the removal ratios of iron and sulfate in AMD notably increased with the involvement of KHCO3in mineralization. In conclusion, the KHCO3-induced mineralization of iron-containing (either divalent or trivalent) AMD into IHSMs not only improved the mineralization ratios and contaminant removal ratios for better remediation of AMD but also obtained mineral resources with better adsorption of Cr(VI), thereby fostering the sustainable advancement of the remediation of AMD. Therefore, this innovative strategy employing KHCO3-assisted chemical mineralization to form IHSMs holds ample potential and promises to be an efficacious methodology for the sustainable remediation of iron-rich AMD.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Mingchao Wang,Zhiji Zhou,Zilong Liang,Shaowen Du,Guoshuai Cai,Xiangjian Wang,Yunlei Zhou,Haijun Zhang
Hydromagnesite (HM) is a widely distributed primary natural carbonate mineral . To expand the application range of hydromagnesite and tap its fire-extinguishing potential, a new type of high-efficiency KHCO 3 @HM dry powder was prepared by coating potassium bicarbonate on the surface of hydromagnesite with a dip coating method. KHCO 3 @HM dry powder obtained a chemical inhibition effect through this method, and the fire extinguishing efficiency has been further improved. A series of tests were carried out to confirm the excellent physical and chemical inhibition effect of KHCO 3 @HM dry powder. Specific surface area tests showed that the specific surface area of KHCO 3 @HM dry powder (31.405 m 2 /g) was higher than NH 4 H 2 PO 4 dry powder (12.766 m 2 /g). Flowability tests showed that KHCO 3 @HM dry powder (0.04 g/s) achieved the same flowability as NH 4 H 2 PO 4 dry powder (0.04 g/s). Local oil basin fire experiments showed that the average fire extinguishing time of KHCO 3 @HM dry powder was shorter with less powder consumption. Under 0.2 MPa driving pressure, the fire extinguishing time of KHCO 3 @HM dry powder was 2.2 s faster than NH 4 H 2 PO 4 dry powder, and the dry powder consumption was 3.71 g less than NH 4 H 2 PO 4 dry powder. The cooling effect of KHCO 3 @HM dry powder (208 ℃) in 10 s was better than NH 4 H 2 PO 4 dry powder (157 ℃), and KHCO 3 @HM dry powder (399 ppm) showed a better smoke suppression effect than NH 4 H 2 PO 4 dry powder (545 ppm). The pyrolysis of KHCO 3 @HM dry powder reduced the fire temperature, diluted the oxygen concentration, and captured free radicals. The final pyrolysis products formed a thick oxide film to provide good heat insulation and asphyxiation effects. The excellent cooling, dilution, asphyxiation, and chemical inhibition mechanisms of KHCO 3 @HM dry powder were demonstrated, and finally achieved a comprehensive performance comparable to NH 4 H 2 PO 4 dry powder.
研究领域:
材料科学
·
消防工程
·
化学工程
✓ 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）