NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 39
·18952-18960
·
IF 3.925
Xuezhen Gao,Zhiyong Cao,Changzhen Li,Junshen Liu,Xunyong Liu,Lei Guo
As a supporting material in the high-tech field, the distribution of indium in the earth's crust is small and scattered. An efficient material is required to selectively adsorb indium from the leaching of other minerals and secondary resources. In this study, an adsorbent phytic acid–hyperbranched polyethyleneimine–oxidized carbon fiber (PA–HPEI–OACF) was prepared by modifying carbon fibers with hyperbranched polyethyleneimine (HPEI) and phytic acid (PA) for the efficient adsorption and separation of In(III) in hydrochloric acid media. The adsorption and separation of absorbents was investigated using static adsorption. The adsorption mechanism of absorbents for In(III) was determined by XPS. The maximum adsorption capacity of PA–HPEI–OACF for In(III) was 34.21 mg L−1 at 298 K and pH of 3.5. The adsorption process of PA–HPEI–OACF for In(III) conforms to the pseudo-second-order kinetic model and involves an endothermic reaction. The adsorption isotherm follows the Freundlich isotherm adsorption model. In the In(III), Fe(II), Cu(II), and Zn(II) mixed solution, PA–HPEI–OACF only adsorbed In(III) and Fe(II) at pH 3.5, and the selectivity coefficient of PA–HPEI–OACF for In(III) over Fe(II) was 798.81. The XPS analysis revealed that the adsorption of PA–HPEI–OACF for In(III) was the result of the combined action of amine groups and phosphate groups with In(III).
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Cong Xue,Ling Zhu,Sicong Lei,Mengping Liu,Chengyi Hong,Lei Che,Junliang Wang,Yuping Qiu
In this study, the adsorption behaviors and mechanisms of Pb(II) and Zn(II) by animal-derived biochar (ADB) in single and binary metal systems were comparatively investigated. ADB contains considerable amounts of Ca/P components and is mainly composed of hydroxyapatite (HAP), which plays an important role in the adsorption of Pb(II) and Zn(II). The maximum adsorption capacities of Pb(II) and Zn(II) on ADB were in the order of Zn(II)-single (3.23 mmol g − 1 ) > Pb(II)-single (2.74 mmol g − 1 ) ≈ Pb(II)-binary (2.71 mmol g − 1 ) > Zn(II)-binary (2.31 mmol g − 1 ). In the single metal system, approximately 99.9% of the adsorbed Pb(II) existed as Pb 5 (PO 4 ) 3 Cl, while the dominant adsorption mechanism of Zn(II) was cation exchange, followed by precipitation, accounting for 78.0%–80.6% and 19.4%–21.5% of the adsorption capacity, respectively. These findings were verified by X-ray diffraction refinement, X-ray photoelectron spectroscopy, metal speciation modeling, and Ca(II) exchange experiment. In the binary metal system, the proportion and form of Pb(II) precipitate remained unchanged. However, the binding of Zn(II) to ADB was completely dependent on the cation exchange with Ca(II), and no remarkable Zn(II) precipitation was observed. Phosphate released from HAP preferentially precipitated with Pb(II) than with Zn(II) when they coexisted. Consequently, Pb(II) competition may alter the Zn(II) adsorption mechanism on ADB. Nonetheless, ADB could serve as an efficient biochar for the simultaneous immobilization of Pb(II) and Zn(II) via different mechanisms.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Zhenzhou Yin,Lei Song,Hongwei Song,Kai Hui,Zhipeng Lin,Qian Wang,Lili Xuan,Zehao Wang,Wenjian Gao
After much effort, the remediation of heavy metal contaminated sediments still remains physically hard and technically challenging issue to resolve. In this study, granular activated carbon-supported titanium dioxide nanoparticles (GAC-TiO 2 NPs) are synthesized to remedy heavy metal copper (Cu) contaminated sediments. The concentration and chemical speciation of Cu in overlying water, interstitial water and contaminated sediments are fully assessed to examine the remediation effect of GAC-TiO 2 NPs. The GAC-TiO 2 NPs are separated from GAC-TiO 2 NPs-remedied sediments and characterized by X-ray photoelectron spectra (XPS), which reveals the mechanism of GAC-TiO 2 NPs remedy Cu Contaminated sediments. The results show that after 35 days adding 20% GAC-TiO 2 NPs to contaminated sediments, the Cu concentration in the overlying water and interstitial water decreases 89.47% and 83.52%, respectively, and the exchangeable fraction (F-1) of Cu in sediments decreases from 43.91% to 7.49%. The percentage of residual fraction (F-4) increases sharply from 42.79% to 80.30%. XPS results show that hydroxyl (–OH) plays an important role in the remediation process. The synergistic effects of pH, phosphorus concentration and organic matter (OM) content on the remediation effect are explored. When the pH value is 8, phosphorus concentration is 0.32 mg/L and OM content is 151.2 g/kg, adding 20% GAC-TiO 2 NPs achieves the best remediation effect on Cu contaminated sediment. Biological enzyme-activity experiments prove that GAC-TiO 2 NPs not only reduce the bioavailability and biotoxicity of Cu, but also effectively suppress the negative effects of granular activated carbon (GAC) on enzyme activities. All these results indicate that GAC-TiO 2 NPs is an environmentally friendly remediation material for Cu contaminated sediments with high-potential applications.
研究领域:
环境科学
·
纳米技术
·
生态毒理学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhicheng Xu,Yuran Li,Yuting Lin,Yan Wang,Qiang Wang,Tingyu Zhu
To strengthen the CO oxidation activity of activated carbon for flue gas purification, AC was modified through acid treatment and metal loading. AC-supported Cu shows excellent catalytic oxidation activity compared with other metal-modified AC samples. To investigate the action modes of Cu loaded on activated carbon and the mechanism of CO oxidation, various samples were characterized by XRD, N 2 O titration, SEM, N 2 physisorption, TPD, H 2 -TPR, XPS, in situ DRIFTS and EPR. The results show that oxygen-containing functional groups increase the loading amount and dispersion of Cu. Moreover, Cu species strongly bound to oxygen-containing functional groups are the main contributors to CO oxidation. The roles of oxygen-containing functional groups are further revealed: carboxyl groups are the anchoring sites of Cu, and hydroxyl groups supply oxygen to restore the active structure. Similarly, Ce indirectly promote the oxidation activity of CO by re-oxidizing Cu + to Cu 2+ , which accelerates the catalytic cycle. The reaction mechanism on AC-supported Cu samples has been proposed to follow the double-site Langmuir–Hinshelwood mechanism, with Cu 2+ as oxidation sites, Cu + as adsorption sites and the formation of oxygen vacancies on Cu + during the reaction. AC-Cu performs the highest oxidation activity at a proportion of Cu + of 0.5–0.6. SO 2 causes irreversible chemical poisoning to CO oxidation, while NO leads to reversible poisoning due to competitive adsorption with CO. The novel AC-supported Cu catalyst with Ce improves the resistance against SO 2 and NO, and the reason is explained. These findings provide theoretical guidance for the preparation and application of metal-modified activated carbon.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2024
·
IF 5.6
Yuqian Zhou,Zhongxin Tan,Tuo Zhou
To overcome the challenges of high oxygen content and low energy density in converting biomass into liquid biofuels, this study proposes an efficient and eco-friendly method: first pyrolyzing rice straw biomass, then converting it into liquid biofuel. It was found that: (1) Characterizing the elemental composition, higher heating value (HHV), thermogravimetric properties, and functional groups of rice straw-biochar-liquid fuel (RS-C-LF), along with analyzing the mass and energy balance of the liquefaction process, revealed that 150 °C was the optimal low liquefaction temperature. (2) The HHV, O and S content, mass and energy yield of RS-C-LF150 were significantly enhanced compared to direct biomass-to-liquids and met the biodiesel standard, with values of 42.16 MJ/kg, 0.82 %, 0 %, 67.49 %, and 69.42 %, respectively. (3) The feasibility and commercial potential of this research was further demonstrated through economic and SWOT analysis of this study liquid biofuel (the total production expenditure is only $171.29/bbl), and the design of the zero-waste and self-circulating preparation system.
研究领域:
能源生物学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 4
·045509
·
IF 1.449
Haifeng Gao,Jianfang Wang,Ren Zhang,Lifang Wu,Cheng-an Tao,Guojun Deng
Aqueous Li-ion capacitors (ALICs) have been extensively studied in recent years due to their safety, environmental friendliness and low availability. In this paper, we constructed an ALIC using carbon-coated lithium iron phosphate (LFP) as the positive electrode, activated reduced graphene oxide as the negative electrode and studied its electrochemical performance in 1 M Li2SO4 electrolyte. Here, coating of LFP particles is carried out by dopamine polymerization to form a uniform carbon layer on the surface of the particles, which increases the conductivity and cycle performance of LFP. The optimal ALIC can achieve 82.8 F g−1 (based on the total mass of the positive and negative materials) at a current density of 0.2 A g−1, and shows good cycling stability. The specific capacitance can still retain 73% of the initial value after 1000 charge and discharge cycles. The specific energy density can reach 11.5 Wh kg−1 at a power density of 100 W kg−1.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jieru Yan,Xiaoxue Zuo,Shengjiong Yang,Rongzhi Chen,Tianming Cai,Dahu Ding
Combined pollution caused by organic pollutants and heavy metals pose a significant challenge to the adsorption process . In this study, iron-modified biochar (Fe-BC) was prepared by using ferrate (K 2 FeO 4 ) and wheat stalk as the precursors for the adsorption of copper (Cu 2+ ) and sulfadiazine (SDZ), especially under combined pollution scenarios. Iron modification not only enlarged the surface area but also loaded iron oxide nanoparticles on biochar surface. Accordingly, Fe-BC exhibited better adsorption capability of Cu 2+ and SDZ than the pristine biochar (BC). The corresponding maximum adsorption capacities of Fe-BC 700 were 46.85 mg g −1 and 45.43 mg g −1 towards Cu 2+ and SDZ, respectively. Interestingly, the adsorption was elevated in binary-pollutants system, suggesting a synergistic effect, which was probably attributed to the mutual bridging effects and complexation between Cu 2+ and SDZ. The loaded iron oxide particles could serve as a physical barrier to separate the adsorptions of Cu 2+ and SDZ and thus inhibited the competitive adsorption. Meanwhile, theoretical calculation demonstrated that sulfonamide group was the most probable binding site. Columns packed with Fe-BC 700 showed better performances for Cu 2+ and SDZ removal in binary system (635.73 BV for Cu 2+ and 4846.26 BV for SDZ) than in single systems (571.60 BV for Cu 2+ and 3572.06 BV for SDZ), which was consistent with batch adsorption experiments. These results demonstrated the potential application of Fe-BC 700 for simultaneous adsorption of Cu 2+ and SDZ and provided a cost-effective way for the remediation of organic and inorganic pollutants.
研究领域:
环境科学
·
污染治理
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 9
·2449-2456
·
IF 2.137
Changjiang Zhu,Mingshan He,Jianguang Cui,Qilong Tai,Lei Song,Yuan Hu
In this work, a novel hyperbranched and phosphorus-containing triazine derivative (HPCFA) is synthesized. HPCFA is used as charring-foaming agent and combined with ammonium polyphosphate (APP) as intumescent flame retardant to flame retard polypropylene (PP). PP/HPCFA/APP composite can achieve limited oxygen index value of 31% and pass UL 94V-0 rating by addition of 20 wt% HPCFA/APP (1/2, w/w). Besides, HPCFA is compared with another hyperbranched charring-foaming agent (HCFA). HPCFA and HCFA have similar chemical structure, and their only difference is that HPCFA has phosphorus-containing unit in the main chain compared with HCFA. HPCFA/APP system exhibits superior flame retardancy compared with HCFA/APP system. Char residue analysis demonstrates that HPCFA/APP system can form denser and more compact char layer in comparison with that of HCFA/APP system.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Chaoyue Wu,Zehua Zhao,Jun Zhong,Yang Lv,Xiaofei Yan,Yingying Wu,Houhu Zhang
In this study, the adsorption performance and behavior for dyes by hydrochar derived from sewage sludge (SS) and lignin-containing waste (garden waste, GW) were investigated. The results indicated that the adsorption capacity for methylene blue (MB) increased as the proportion of GW increased, reaching up to 52.39 mg/g under the mixing ratio of GW and SS 5:5 (5GW:5SS-HC), which represented an enhancement of 22.64 % compared with no addition of GW. The adsorption of 5GW:5SS-HC for MB was significantly influenced by the environmental pH, with enhanced adsorption observed in alkaline conditions due to strengthened electrostatic interactions. Adsorption kinetics and thermodynamics indicated that the adsorption for MB occurred on a heterogeneous surface and was primarily a chemical adsorption process. While the addition of GW did not significantly alter the specific surface area or pore structure of the hydrochar, it increased the presence of hydroxyl and other oxygen-containing functional groups, as well as aromatic ring structures. It strengthened the hydrogen bonding and π-π interactions thereby facilitating the adsorption of MB on the surface of hydrochar. Therefore, co-hydrothermal carbonization of GW and SS can produce hydrochar with excellent adsorption performance for MB, providing a novel technological approach for the resource utilization of SS and new insights into the role of lignin component in promoting the adsorption of hydrochars.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Mi Yan,Hongcai Su,Zhihao Zhou,Dwi Hantoko,Jianyong Liu,Jingyi Wang,Runpei Wang,Ekkachai Kanchanatip
The effluent of food waste (FWE) is generated during food waste treatment process. It contains high organic matter content and is difficult to be efficiently treated. In this study, the sample was collected from a 200 t/d food waste treatment center in Hangzhou, China. Subcritical and supercritical water gasification were employed to decompose and convert FWE into energy. The effects of reaction temperature (300–500 °C), residence time (20–70 min) and activated carbon loading (0.5–3.5 wt%) on syngas production and the remaining pollutants in liquid residue were investigated. It was found that higher reaction temperature and longer residence time favored gasification and pollutant decomposition, resulting in higher H 2 production and gasification efficiencies. It is noteworthy that the NH 3 -N was difficult to be converted and removed under current experimental conditions. The addition of activated carbon was found to increase the gasification efficiency. The highest total gas yield, H 2 yield, carbon conversion efficiency, gasification efficiency, total organic carbon removal efficiency and chemical oxygen demand removal efficiency were obtained from gasification at 500 °C for 70 min with 3.5 wt% activated carbon.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2018
·
IF 4.005
Fengzhen Zhang,Kaiyi Wu,Hongtao Zhou,Yun Hu,Preis Sergei,Haizhen Wu,Chaohai Wei
Sludge collected from industrial wastewater treatment possesses a threatening effect on environment, and changing it into functional material provides an alternative for its disposal. Biochar synthesized by pyrolysis of sludge obtained from coking wastewater treatment was evaluated for the catalytic ozonation of phenol in aqueous solution. The present work focused on testing the catalytic performance of biochar, deducing the kinetics of phenol removal in various reaction conditions, and finally elucidating the mechanism of biochar-enhanced phenol removal. The results demonstrated that biochars produced at pyrolysis temperatures of 700 and 900 °C revealed highly comparable catalytic activity in phenol ozonation , leading to around 95% phenol removal within 30 min reaction, due to the abundant carbonyl groups on biochar surface. The biochar, however, was suffered from poor stability, which was attributed to biochar loss and changes in surface chemistry. On the basis of examining reaction variables, an empirical kinetic model was developed well matching experimental results. It was found that ozone concentration adsorbed on biochar surface was first increased with a peak (3.8 mg/L for biochar obtained at 700 °C) at reaction time 10 min, after which it decreased along with proceeding reaction. In light of radical scavenging test, superoxide radical ( O 2 ˉ) was identified as main radical species produced from the interaction of ozone with biochar surface, while hydroxyl radical ( OH) played negligible role in biochar catalytic ozonation. The promoting mechanism of bicarbonate on phenol ozonation was verified to be the generation of O 2 ˉ via series reactions of HCO 3 ˉ with OH and ozone, apart from increase in solution pH. These results provide important implications for future recycling of coking wastewater treatment sludge in environmental remediation.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Qingmei Meng,Yanli Zhang,Di Meng,Xinpeng Liu,Zijian Zhang,Peiling Gao,Aiguo Lin,Lian Hou
Phosphoric acid is used to in-situ activate biochar pyrolyzed by cotton shells to enhance the adsorption ability of sulfadiazine (SDZ). To confirm the optimum condition, different impregnation ratios and impregnation times were investigated. It was found that the biochar (BC) pyrolyzed under the condition of an impregnation ratio of 2.5 and an impregnation time of 6 h showed the highest performance for the removal of SDZ. The maximum adsorption ability was 86.89 mg/g at a temperature of 298 K. The pseudo-second-order model was used to disclose the adsorption process of SDZ by BCs. The experimental data were described by the Langmuir and Temkin isotherms at different temperatures. It was found that the sorption of SDZ was an exothermic process according to the thermomechanical analysis. The activated BC could be recycled for at least five times with a high removal rate of SDZ. Thus, activated BCs are regarded as promising adsorbents for SDZ removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）