Materials
·
2023
·Vol. 16
·期 11
·3994
·
IF 3.4
Qingxiang Wang,Yan Yue,Wenfei Liu,Qing Liu,Yu Song,Chengjun Ge,Hongfang Ma
Biochar can be used to address the excessive use of tetracycline and micronutrient chromium (Cr) in wastewater that potentially threatens human health. However, there is little information about how the biochar, made from different tropical biomass, facilitates tetracycline and hexavalent chromium (Cr(VI)) removal from aqueous solution. In this study, biochar was prepared from cassava stalk, rubber wood and sugarcane bagasse, then further modified with KOH to remove tetracycline and Cr(VI). Results showed that pore characteristics and redox capacity of biochar were improved after modification. KOH-modified rubber wood biochar had the highest removal of tetracycline and Cr(VI), 1.85 times and 6 times higher than unmodified biochar. Tetracycline and Cr(VI) can be removed by electrostatic adsorption, reduction reaction, π–π stacking interaction, hydrogen bonding, pore filling effect and surface complexation. These observations will improve the understanding of the simultaneous removal of tetracycline and anionic heavy metals from wastewater.
研究领域:
环境科学
·
污染控制
·
材料科学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Chang Liu,Xiaowei An,Peifen Wang,Xuli Ma,Xingfa Li,Xin Chen,Yongguo Li,Xiaogang Hao,Xiaoxu Zhang,Abuliti Abudula,Guoqing Guan
In this study, a highly efficient and cost-effective adsorbent for gaseous iodine, nitrogen-doped KOH-activated coconut shell biochar (NKBC), is presented. A two-step pore expansion assisted by KOH activation process, enhanced by nitrogen doping, created a hierarchical porous structure with ultra-high specific surface area of 2977.90 m 2 /g, large total pore volume of 2.19 cm 3 /g and available micropore volume of 1.17 cm 3 /g, resulting in an iodine adsorption capacity of 6635 mg/g at 75℃ within 3 hours. The low desorption rate (12.93 % at room temperature) highlights the material's stability. Grey relational analysis identified specific surface area and pore structure as key determinants of adsorption capacity, while pore size distribution and nitrogen content significantly influenced desorption. DFT calculations confirmed the enhanced iodine adsorption by nitrogen functionalities and the effectiveness of micro- and narrow mesopores in iodine capture. This sustainable approach offers a significant advancement in developing high-capacity adsorbents for the effective remediation of radioactive iodine.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yi Qin,Bo Chai,Chunlei Wang,Juntao Yan,Guozhi Fan,Guangsen Song
A porous biochar (BC) was prepared using the recycled agricultural waste rape straw as resources by combining high temperature carbonization with KOH activation procedure, and applied into tetracycline hydrochloride (TC) adsorption. The multiple characteristic techniques were adopted to investigate the structures and properties of as-prepared BC. The results demonstrated that the BC activated by KOH would possess the more graphite-like structures, more abundant oxygen-containing functional groups, and larger specific surface area (1531 m 2 /g) comparing with unactivated BC, which were favorable for the TC adsorption. The effects of initial TC concentration, solution pH value, salt ionic strength and adsorption temperature on the adsorption performances were explored in detail. The adsorption data could be well fitted by the pseudo-second-order kinetic model and Freundlich isothermal model. The maximum adsorption capacity of KOH activation BC could reach 325.07 mg/g at 30 °C. The endothermic and spontaneous properties of the adsorption system was implied by thermodynamic study. The adsorption TC mechanism of KOH activation BC was involved in the pore filling, π-π electron donor-acceptor interaction, hydrogen bonding and electrostatic action. Regeneration experiments showed that the TC removal efficiency could still attain 97.0% even after six cycling experiment, suggesting that the BC had the excellent reusability and stability. These results indicate the feasibility of a win-win strategy for the application of agricultural waste to water remediation.
研究领域:
环境科学
·
农业资源利用
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DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 43
·30176-30189
·
IF 3.9
Wei Yang,Lei Zhang,Meng Li,Ting Zhang,Yue Liu,Juan Liu
In this work, bamboo charcoal (BC) is prepared by pyrolysis of bamboo. Then, KOH modification and surface deposition of Goethite (α-FeOOH) are performed to obtain a new KOH-modified BC loaded with α-FeOOH (FKBC) adsorbent for copper (Cu2+) and fluoride (F−) ion adsorption from aqueous solution. Surface morphology and physiochemical properties of the prepared adsorbent are characterized by scanning electron microscopy-energy dispersive spectrometer, X-ray diffraction, and N2 adsorption–desorption. The effect of pH, contact time, adsorbent dosage, and initial concentration on Cu2+ and F− adsorption is also investigated. In addition, adsorption kinetics and isotherms are fitted to pseudo-second-order kinetics and Langmuir model, respectively. Thermodynamic parameters suggest that the adsorption process is spontaneous and endothermic. The adsorption mechanism is further characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The Cu2+ absorption mainly occurs through ion exchange, coordination reactions, and surface precipitation, while the F− adsorption mainly occurs via ion exchange and hydrogen bonding. The selective adsorption experiments reveal that FKBC has good selectivity for Cu2+ and F−. The adsorption–desorption experimental results indicate that FKBC can be reused for Cu2+ and F− adsorption after regeneration. Results indicate that FKBC can be a promising adsorbent for Cu2+ and F− removal from aqueous solutions.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Biobased Materials and Bioenergy
·
2014
·Vol. 8
·期 1
·35-42
·
IF 0.586
Wang Xuyu,Wang Sai,Yin Xueqiong,Chen Junhua,Zhu Li
Activated carbon (AC) was prepared from cassava residue using a two-step activation, including carbonization and subsequent KOH activation. The conditions of activation were optimized through single factor and orthogonal experiments. Heating at 700 °C for 90 min resulted in a charcoal
yield of 20%, the optimal condition for carbonization. Factors affecting surface area (S
BET) were KOH/char ratio > activation temperature > activation time. The porous structure of the AC was characterized using the physical adsorption of N2 at 77 °K.
AC with a S
BET of 460–2655 m2/g and pore volume of 0.41–1.198 cm3/g were prepared. Prepared AC had a high proportion of micropores (range: 83.0–92.0%) compared to mesopores. The average diameters of the micropores and mesopores were
in the range of 0.991–1.093 nm and 19.37–37.97 nm, respectively. The highest adsorption capacities for formaldehyde and iodine were 295 mg/g and 1387 mg/g, respectively. SEM images demonstrated the topographic structure of the AC.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Balaji Panchal,Yuzhuang Sun,Cunliang Zhao,Bangjun Liu,Kai Bian,Jinxi Wang,Qiaojing Zhao
Declining fossil fuel reserves and fluctuating petroleum prices have prompted global research efforts to develop clean, renewable, and sustainable alternatives to traditional fossil fuels. In this study, a reusable and eco-friendly activation catalyst was designed by combining KOH with a polymer. A series of three polymer catalysts were synthesized, and their catalytic activities were compared with those of COP-KOH, COP-K 3 PO 4 and COP-KF. It was found that the prepared COP-KOH catalyst showed the highest activity. The catalyst was characterized by FT-IR, which confirmed the presence of potassium support successfully coordinated on the COP. Additional analyses included N 2 and BET, XPS, SEM, mapping, and basicity measurement by ICP analysis. The prepared catalysts a possessed mesoporous structure, high surface area of 4.2961 m 2 /g −1 , pore volume of 2.2439 m 2 /g −1 , and high basicity. Here, the activity and stability of the potassium modified mesoporous polymer COP-KOH catalyst in green fuel synthesis from waste fried sunflower oil was evaluated. The green fuel conversion rate of 96.42 % was achieved under optimal reaction conditions, with a molar ratio of 6:1 methanol to fried sunflower oil, a catalyst concentration of 85 wt%, a reaction temperature of 61 °C, and a reaction time of 4.5 h. A satisfactory yield of 92.1 % was obtained after use for four consecutive cycles without significant deactivation, and after the fourth cycle catalyst was reactivated with KOH. The characteristic differences in the FT-IR results of the fresh catalyst, used catalyst, and re-activated COP-KOH catalyst, indicated the mode of interaction between the catalyst and reactants. The kinetics of the transesterification reaction was also determined, and the activation energy was found to range from 20.9 to 23.4 kJ . mol −1 . The properties of the green fuel were found to be in good agreement with the ASTM D6571-02 standard. The catalyst is recyclable, and using inexpensive feedstock makes the overall process more cost-effective and environmentally friendly.
研究领域:
化学工程
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COMPOSITE MATERIALS
·
2020
·
IF 1.972
Chang Xu,Dong Zhang
Multifunctional structural supercapacitor based on the structural electrolyte of cement/PVA-KOH composite and the structural electrode of highly electrically graphene was fabricated with sandwich structure. A bicontinuous microstructure composed of PVA and hardened cement paste is formed. Flexible PVA in cement/PVA-KOH composite increases ions’ accessibility with graphene at the interface between the structural electrode and the structural electrolyte. The addition of KOH changes the structure of PVA from crystalline state to amorphous state. So PVA can complex and discomplex with KOH to realize ionic conduction. The effects of PVA’s content, polymerization degree and hydrolysis degree on the electrochemical properties and mechanical properties were analyzed. The composite’s ionic conductivity increases with PVA’s content and hydrolysis degree, and it shows a tendency of decreasing after increasing with PVA’s polymerization degree. Similarly, the specific capacitance of the structural supercapacitor also increases with PVA’s content and hydrolysis degree, but decreases with PVA’s polymerization degree. Compared with the polymerization degree, the hydrolysis degree plays a more prominent part in affecting the specific capacitance of the structural supercapacitors. For mechanical properties of cement/PVA-KOH composite, the compressive strength is mostly improved by PVA at a content of 2%. It decreases with PVA’s polymerization degree and increases with PVA’s hydrolysis degree. The conflict between the power density and energy density in structural energy storage is eased remarkably and the electrical and mechanical properties can be improved simultaneously. The two chief obstacles are tackled in the PVA1799-based structural supercapacitor.
研究领域:
材料科学
·
电化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2020
·
IF 0.593
Shuai Ru,Zhaoquan Ai
2,2’-Bipyridine with strong coordination ability for metal ions was used to prepare N-doped porous carbon materials by a facile method of solution agitation and annealing, with KOH as the activated solvent. Applied to supercapacitors, these porous carbon materials exhibit high specific capacitance and outstanding rate performance, which are attributed to their larger specific surface area, richer pore structure, and N-doping after KOH activation, leading to fast electron transport and increased ion storage in the unique architecture.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Yan Zhang,Yun-Peng Zhao,Le-Le Qiu,Jian Xiao,Fa-Peng Wu,Jing-Pei Cao,Yong-Hui Bai,Fang-Jing Liu
High-performance supercapacitors extremely depend on reasonable microstructure of electrode materials, but how to efficiently control the pore structure of principal carbon materials remains a challenge. In this study, corncob-based porous carbon (CPC X ) with controllable pore structures is synthesized by means of KOH activation strategy, and the technical parameters of KOH activation are comprehensively investigated including activation temperature, activation time and KOH/biochar ratio. The optimal sample with a KOH/biochar mass ratio of 3 activated at 650 °C for 1 h (denoted as CPC 650 – 1-3 ) possesses sub-nanopores concentrated at 0.6 nm and 0.8 nm, and larger micropores distribute at 1.2 nm and 1.5 nm. These highly cross-linked microporous structures provide accessible specific surface area (SSA) for electrode materials and act as high-speed channels for fast ion diffusion and transfer. The activated carbon material has a high SSA (2998 m 2 g −1 ) and a large V micro /V meso ratio of 8.26. The specific capacitance of CPC 650 – 1-3 reaches 258 F g −1 at 0.5 A g −1 and remains a satisfied retention of 74 % even at 10 A g −1 . Moreover, CPC 650 – 1-3 //CPC 650 – 1-3 symmetric supercapacitors exhibit a high energy density of 6.4 Wh kg −1 at power density of 500.1 W kg −1 . It also has a capacitance retention of 90.1 % after 10,000 cycles, highlighting its excellent cycle stability. These results indicate that corncob-based microporous carbon materials have broad application prospects in promoting the high added-value utilization of biomass waste and the development of high-performance supercapacitors.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qingtang Zhang,Xiaoyu Wu,QiQi Shu,Ce Su,Xiaomei Wang
Nano porous Li 2 FeSiO 4 /C composite (LFS-10S) was prepared by KOH selective etching Li 2 FeSiO 4 -(SiO 2 ) 0.1 /C composites. This method allows directly pore-creating on Li 2 FeSiO 4 crystal. Common porous Li 2 FeSiO 4 /C (LFS) were also prepared as a control. LFS-10S and LFS were characterized by XRD, SEM, TEM and nitrogen adsorption/desorption test. XRD analysis shows that the LFS-10S material was composed of crystalline particles with a monoclinic crystal system in the P 2 1 space group. SEM and TEM tests indicate that the particle size of LFS-10S is 20 ∼ 30 nm. The nitrogen adsorption/desorption test shows that the specific surface area of LFS-10S is 123.23 m 2 /g, larger than that of LFS (71.56 m 2 /g). These features make LFS-10S exhibit better electrochemical performance over LFS. The specific discharge capacity of LFS-10S at 0.1 C is as high as 235.2 mA h g −1 , higher than that of LFS (158.4 mA h g −1 ). Moreover, the rate performance, cycling performance and lithium ion diffusion coefficient of LFS-10S are all better than those of LFS.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Wenshuai Jiang,Yaning Wang,Yiheng Liu,Qianfang Jia,Caojie Zhao,Jin Yang,Wu Ren,Qingjun Liu
Graphene oxide (GO) and MXene-based membranes have been widely used in the field of water purification due to their excellent separation properties. However, the poor stabilities of these species in water and the ‘trade-off’ effect between permeability and retention greatly limit their practical applications. In this study, modified GO/MXene composite membranes were prepared via double regulation with sodium alginate (SA) and KOH. During the modulation process, SA formed more hydrogen bonds with GO/MXene nanosheets. Meanwhile, SA acts as a “mortar” during the assembly of GO/MXene nanosheets, avoiding their aggregation and disordered stacking. During the subsequent regulation in the KOH solution, K+ not only enlarged the interlayer spacing of the composite membrane, but also interacted with the oxidation groups on the GO (cation-π) to play a fixed role in fixing the interlayer spacing of the composite membrane to reduce the swelling of the composite membrane. Furthermore, the number of oxygen-containing functional groups on the surfaces of the GO/MXene composite membranes was significantly reduced under alkaline conditions, which further enhanced the selectivity of the composite membranes to the selectivity of the composite membrane to the dye molecules. Due to the synergistic effect generated by the dual regulation of SA and KOH, the K+/GO/MXene composite membranes exhibited excellent water treatment performance, in terms of their permeability and dye retention, as well as high physical stability. By optimizing the content of SA and the ratio of GO/MXene, the composite membrane with the optimal separation performance was successfully synthesized. Compared with ordinary GO/MXene composite membranes, the water flux of the K+/GO/MXene-SA composite membrane was enhanced from 48 to 88.07 Lm −2 h −1 bar −1 .The K+/GO/MXene-SA composite membrane has excellent MB dye separation performance, with a removal rate of more than 97.75 %. In addition, the K+/GO/MXene-SA composite membrane demonstrated an excellent structural stability in acidic and alkaline solutions. The filtered composite membrane still maintains excellent stability and has good recyclability after desorption.These results therefore provide new insights into the design of two-dimensional membrane separation materials for use in the purification of dye effluents.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Yifang Mi,Wenqiang Wang,Sen Zhang,Yalong Guo,Yufeng Zhao,Guojin Sun,Zhihai Cao
Biomass-based activated carbon (CBACs) was successfully prepared by pyrolysis-activation of Taihu cyanobacteria. When the impregnation ratio and activated temperature were 2 and 800 o C, respectively, the optimal CBACs possessed an ultra-high specific surface (2178.90 m 2 ·g −1 ) and plenty of micro-and meso-pores, as well as a high pore volume (1.01 cm 3 ·g −1 ). Ascribed to ultra-high surface area, π-π interaction, electrostatic interaction, as well as hydrogen bonding interactions, the CBACs displayed huge superiority in efficient dye removal. The saturated methylene blue (MB) adsorption capacity by CBACs could be as high as 1143.4 mg·g −1 , superior to other reported biomass-activated carbons. The adsorption was endothermic and modelled well by the pseudo-second-order kinetic, intra-particle diffusion, and Langmuir models. This work presented the effectiveness of Taihu cyanobacteria adsorbent ascribed to its super large specific surface area and high adsorption ability.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）