RSC Advances
·
2019
·Vol. 9
·期 72
·42343-42350
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IF 3.049
Zhibing Yin,Nian Liu,Siyao Bian,Jihui Li,Shuying Xu,Yucang Zhang
Catalytic oxidative pyrolysis is a promising method for the preparation of highly adsorptive biochar by introducing oxygen-containing groups. Here, a K2FeO4-catalyzed oxidative pyrolysis was described for enhancing the adsorption capability of areca leaf biochar toward methylene blue at low temperature. It was shown that the maximum adsorption capacity of the biochar pyrolyzed at 200 °C was greatly improved from 122.67 to 251.95 mg g−1 with the catalysis of K2FeO4 due to the introduction of surface oxygen-containing groups. In addition, a high adsorption capability was observed over a wide pH range for the K2FeO4-modified biochar and nearly neutral pH was obtained after adsorption, further demonstrating the great advantages of K2FeO4-catalyzed oxidative pyrolysis. Mechanistic studies revealed that the adsorption of the pristine biochar was mainly determined by hydrogen bonding and electrostatic interaction. Whereas, the adsorption of the K2FeO4-modified biochar was attributed to cation exchange besides hydrogen bonding and electrostatic interactions.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dongmei Ma,Yang Yang,Bingfeng Liu,Guojun Xie,Chuan Chen,Nanqi Ren,Defeng Xing
Zero-valent iron and biochar composite (ZVI/BC) is a prospective catalyst for activating persulfate and specific surface area (SSA) of ZVI/BC is one of the most important factors affecting its efficacy in the removal of environmental contaminants. However, the green fabrication of ZVI/BC with large SSA remains a challenge. In this study, ZVI/BC with a highly porous structure and large SSA fabricated by co-pyrolysis of K 2 FeO 4 and bamboo was prepared and characterized. The large SSA stemmed from the catalytic and corrosive functions of K and the oxidation of K 2 FeO 4 onto bamboo. ZVI/BC fabricated with 0.05 mol/L K 2 FeO 4 (BC-Fe 0.05 ) showed optimal sulfadiazine (SDZ) removal performance in the peroxydisulfate (PDS) activation system with complete removal after 10 min, as it showed the highest adsorptive ability of SDZ. Moreover, BC-Fe 0.05 was able to remain stable after four cycles or 80 days of storage. Higher temperature, lower pH, and Cl − were beneficial to SDZ removal efficiency, whereas CO 3 2– and HPO 4 2− had inhibitory effects. Non-radical species ( 1 O 2 ) and radical species (SO 4 − , OH, and O 2 − ) both contributed to SDZ degradation, and 1 O 2 was the most important reactive oxygen species. Four degradation pathways were proposed based on ten identified intermediates. Potential eco-toxicity analysis by ECOSAR suggested that most intermediates were less toxic than their parent compound. Overall, this study describes a green fabrication method for ZVI/BC with large SSA using K 2 FeO 4 as the iron precursor. Generally, ZVI/BC with large SSA is an effective catalyst for activating persulfate to degrade antibiotics.
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MOLECULES
·
2023
·Vol. 28
·期 8
·3410
·
IF 4.6
Yuyu He,Liangmeng Ni,Qi Gao,Hao Ren,Mengfu Su,Yanmei Hou,Zhijia Liu
To effectively remove methylene blue (MB) from dye wastewater, a novel activated carbon (BAC) was manufactured through co-pyrolysis of bamboo shoot shell and K2FeO4. The activation process was optimized to a temperature of 750 °C and an activation time of 90 min based on its excellent adsorption capacity of 560.94 mg/g with a yield of 10.03%. The physicochemical and adsorption properties of BACs were investigated. The BAC had an ultrahigh specific surface area of 2327.7 cm2/g and abundant active functional groups. The adsorption mechanisms included chemisorption and physisorption. The Freundlich model could be used to describe the isothermal adsorption of MB. The kinetics confirmed that the adsorption of MB belonged to the pseudo-second-order model. Intra-particle diffusion was the main rate-limiting step. The thermodynamic study showed that the adsorption process was endothermic and temperature was beneficial for the improvement of adsorption property. Furthermore, the removal rate of MB was 63.5% after three cycles. The BAC will have great potential for commercial development for purifying dye wastewater.Keywords:bamboo shoot shell;activated carbon;adsorption process;methylene blue;K2FeO4
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BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Qiuju Wang,Zhao Zhang,Guoren Xu,Guibai Li
Magnetic porous biochars (MC HCl , MC HAc ) with nanostructure on surfaces were prepared from penicillin fermentation dregs by pyrolysis with K 2 FeO 4 activation and used in penicillin adsorption. MC HCl and MC HAc had high BET surface areas of 672 and 735 m 2 /g, respectively; mainly be attributed to the activation of K 2 FeO 4 as well as acid pickling. Saturation magnetizations of MC HCl and MC HAc were 75.29 and 42.45 emu/g, respectively; the magnetism was mainly derived from the Fe 3 O 4 and Fe 3 C in magnetic biochars. MC HCl had nano sticks of ~ 80 nm and MC HAc had petal-like slice of ~ 30 nm on surfaces. The maximum adsorption capacities of penicillin on MC HCl and MC HAc were 196 and 322 mg/g at 308 K, respectively. The adsorptions of penicillin on MC HCl and MC HAc were consistent with pseudo primary kinetics and the Langmuir adsorption isotherm model, and thermodynamic analysis indicated that the adsorption mechanism included physical and chemical adsorption.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zilong Zhao,Xing Wang,Guocheng Zhu,Feng Wang,Yu Zhou,Wenyi Dong,Hongjie Wang,Feiyun Sun,Haijiao Xie
Herein, we report a novel strategy for the fabrication of almond shell biochar-based materials containing highly dispersed graphene nanosheet structures by sequential treatment with hydrochloric acid and potassium ferrate. The resulting material serving as particle electrodes endowed the three-dimensional electrolysis system with excellent and stable Cu-ethylene diamine tetraacetic acid (Cu-EDTA) decomplexation and mineralization ability, along with Cu(Ⅱ), chemical oxygen demand, and dissolved total organic carbon removal efficiencies of 96.8%, 92.5%, and 86.2%, respectively. In contrast to excess Cu(Ⅱ) or EDTA, the complete complexation between Cu(Ⅱ) and EDTA facilitated EDTA degradation. During the reaction, the adsorption toward Cu(Ⅱ), rather than EDTA, in the complexing system, alleviated the burden of electrochemical oxidation for Cu-EDTA decomplexation. This, together with direct and indirect electrocatalytic oxidation mediated by adsorbed hydroxyl radicals on the particle electrode surface, contributed to the enhanced removal of Cu-EDTA. Density functional theory calculations further demonstrated the main types of active sites and the importance of the graphene nanosheet structure of the particle electrodes. This work provides different perspectives on the electrocatalytic removal of heavy metal complexes.
研究领域:
环境科学
·
材料科学
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122651
·
IF 7.5
Zhiquan Xiang,Lei Bo,Yijie Zhang,Lei Jiang,Jian Wang,Juncheng Jia,Chuan Jin
A domestic wastewater treatment plant(DWWTP) experienced inflow shocks due to the illegal discharge of external industrial wastewater, which adversely affected the effluent quality. This study systematically investigates the removal performance and underlying mechanisms of K₂FeO₄ with respect to various pollutants in both simulated and real wastewater influents. The removal of inorganic pollutants is primarily attributed to the coagulation effect of the in-situ generated Fe(III) (reduction product). Conversely, the degradation of organic pollutants relies on direct oxidation by Fe(VI), wherein high-valent intermediate iron species (Fe(V)/Fe(IV)) serve as critical oxidative intermediates. Engineering trials, integrated with machine learning (ML) model predictions, demonstrate that K₂FeO₄ pretreatment effectively transforms refractory organic phosphorus (O-P) and organic nitrogen (O-N) and significantly enhances wastewater biodegradability, thereby creating favourable conditions for subsequent biological treatment. This work elucidates the synergistic "oxidation-coagulation" mechanism of K₂FeO₄ in wastewater pretreatment, providing a robust theoretical foundation for its full-scale engineering application.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Li Siwen,Lin Yingzi,Wang Gaoqi,Zhu Suiyi,Liu Gen,Shi Chunyan,Chen Lei
This study researched the formation of disinfection by-products (DBPs) in sulfamethazine (SMZ) chlorination after preoxidation by K2FeO4 and O3 and the influence of preoxidation on cytotoxicity and biological toxicity. Then, the study emphatically analyzed the influencing factors such as NaClO dosage, pH value, reaction temperature, fulvic acid (FA), and bromide and iodide ions. The results showed that preoxidation by K2FeO4 effectively inhibited the formation of DBPs of haloketones (HKS) and trihalomethanes (THMs), with an average inhibition rate of over 60%. The formation of DBPs after preoxidation by O3 was higher than that by K2FeO4; preoxidation by K2FeO4 reduced the influence of NaClO dosage, temperature, and pH value on the production of DBPs after SMZ chlorination. The cytotoxicity and biological toxicity of SMZ chlorination after preoxidation were evaluated and compared by calculating the LC50 value of DBPs and the luminescent bacteria method. The results of both calculation methods showed that the toxicity of DBPs after preoxidation by K2FeO4 was lower than that by O3 preoxidation. K2FeO4 and O3 preoxidation improved the SMZ removal efficiency by 8.41 and 10.49%, respectively, and inhibited the formation of most DBPs, but the preoxidation promoted the formation of highly toxic DBPs (HANs). The toxicity of DBPs formed in SMZ chlorination after preoxidation by K2FeO4 and O3 was slightly higher than that of chlorination disinfection alone, but it was still within the safe range. This study provides more new details about the formation and toxicity changes of DBPs in the process of SMZ chlorination after preoxidation.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Zhiliang Cui,Guoren Xu,Banu Ormeci,Jiayin Hao
In this study, a novel magnetic material (MPC800) was synthesized from penicillin mycelial dreg via K 2 FeO 4 fabrication. The characterization results demonstrated that Fe 3 O 4 particles were successfully loaded on the surface of MPC800, which provided independent functional sites, with high surface area accompanied by strong magnetic separation performance. The removal capacities of Cu 2+ and Cd 2+ on MPC800 in the single-metal system reached 93.28 mg/g and 69.20 mg/, respectively, at 25 °C and pH 5.0, which were 12.31 and 19.60 times higher than those before activation. The sorption of Cu 2+ and Cd 2+ on MPC800 fitted well to the pseudo-second-order model and Langmuir isotherm model. In the binary-metals system, the sorption of Cu 2+ on MPC800 was slightly affected. At the same time, the uptake of Cd 2+ was severely inhibited, indicating that competitive adsorption occurred between the two metal ions , and the adsorption preference of Cu 2+ was better than that of Cd 2+ on MPC800. Furthermore, MPC800 was highly effective in metal ion solutions prepared with natural water and has an excellent recycling capacity.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Bo Jiang,Yunshu Zhang,Cong Li,Jiaqi Guo,Chunmeng Sun
Nanoscale zero-valent iron loaded on N-doped biochar (nZVI/NBC) is a novel catalyst for activating peroxydisulfate (PDS) toward efficient degradation of endocrine disruptors in water. In this study, spent coffee grounds were modified by K 2 FeO 4 and then transformed into nZVI/NBC by one-step pyrolysis . The nZVI/NBC modified with 0.3 mol/L K 2 FeO 4 displayed an excellent PDS activating performance, and the specific surface area and average pore width of this nZVI/NBC were 277.19 m 2 /g and 2.47 nm, respectively. Bisphenol A (BPA) as a typical endocrine disruptor can be efficiently degraded by nZVI/NBC/persulfate advanced oxidation process . The optimum dosage of nZVI/NBC was 0.1 g/L, and the optimum PDS concentration was 20 mM. pH (3−9) had little effect on BPA degradation. In addition, the presence of Cl − had a facilitating effect on BPA degradation, while CO 3 2− and HPO 4 2− had strong inhibitory effects. nZVI/NBC had long-term stability in that the activation rate remained stable after five cycles and 90 days of storage in air and natural light. This study also investigated the activation mechanism of PDS by nZVI/NBC and concluded that radical (•OH, SO 4 •− , and O 2 •− ) and non-radical ( 1 O 2 ) processes were simultaneously presented under the synergistic catalysis of ZVI and N. The formation of metastable PDS intermediates on the surface of biochar substantially enhanced the adsorption of PDS/BPA and the electron transfer process. Finally, the degradation pathways of BPA were speculated based on nine identified intermediates. Overall, this study described a rapid and green method for nZVI/NBC fabrication, which simultaneously achieved the recycling of spent coffee grounds and the degradation of endocrine disruptors in water.
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