Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jianhua Sha,Yunkai Sun,Haiyan Yu,Zitong Yang,Hongwei Chu,Yan Wang,Qinyan Yue,Weiyan Yin,Shiping Xu
To overcome the recovery challenge of nanoscale photocatalysts, great endeavor has been paid to explore effective nano-TiO 2 immobilization approaches, but comprehensive comparison between these methods is still lacking. Herein, four approaches, namely impregnation-calcination, sol-gel, solvothermal route and click chemistry strategy were fully compared to immobilize nano-TiO 2 onto biochar from the viewpoint of properties characterization, photocatalytic activity, structure stability and pollutant degradation pathway. It was found that, compared to other three methods, product obtained by click chemistry (CC-P25/BC) showed superior adsorption-photocatalysis synergy and persistent long-term stability. These superiorities were not attributed to pore structure, crystallinity or light absorption , but predominated by the robust chemical bonds between TiO 2 and biochar, which served as an effective internal channel for electrons transportation. Besides, with CC-P25/BC as photocatalyst, a unique self-acceleration period was observed during methylene orange (MO) degradation. Via investigating MO degradation pathway and solution environment, we found that it was the strong photocatalytic activity of CC-P25/BC that selectively accelerated MO demethylation, thus leading to solution pH drop and subsequent MO adsorption enhancement and then degradation acceleration. Thus, this study confirmed the superiority of click chemistry in nanoscale photocatalyst immobilization, and affirmed the importance of pollutant degradation process in governing its degradation rate.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 111
·109983-109991
·
IF 3.289
Hong-Tao Fan,Li-Qi Shi,Hua Shen,Xi Chen,Kun-Peng Xie
Hazelnut shell, an agricultural waste, was used to prepare activated carbons by phosphoric acid activation. Hazelnut shell derived activated carbon (HSAC) was characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy and N2 adsorption/desorption isotherms, and was used as an adsorbent for the removal of three tetracycline (TC) antibiotics (tetracycline (TC), oxytetracycline (OTC), and chlortetracycline (CTC)) from aqueous solution. Batch adsorption studies were carried out by varying the initial concentrations of TCs, pH of solution, ionic strength of solution, contact time and temperature. 20 min was required to attain equilibrium. There was no significant influence of ionic strength in a range from 0.0001 to 1 mol L−1 and pH in the range of 4–8 on the uptakes of TCs by the HSAC. The maximum adsorption capacities of the HSAC followed the sequence OTC (321.5 mg g−1) > CTC (313.5 mg g−1) > TC (302.9 mg g−1). The data fitted well with the pseudo-second-order kinetic and Langmuir models. The intraparticle diffusion model indicated that the adsorption of TCs on the HSAC was controlled by both intraparticle diffusion and external mass transfer. Under the test temperature and pressure, the thermodynamic constants revealed that the adsorption of TCs onto the HSAC was spontaneous and endothermic. The HSAC had relatively high potential for the removal of TCs from aqueous solution.
研究领域:
环境科学
·
生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2021
·Vol. 21
·期 3
·1439-1445
·
IF 0
Shi Yanpeng,Zhang Lei,Shao Ji,Shan Xiaoyue,Ye Haipeng,Tan Siwei,Chen Jianrong,Wu Xilin
Herein, a facile and low-cost method for the preparation of activated carbon from peanut shell was developed for the first time for the fast extraction and determination of Bisphenol A in human urine. Bisphenol A was separated by EC-C18 column (250 mm×4.6 mm, 4 μm) and was
detected by VWD, with retention time for qualitative analysis and peak area for quantitation. The parameters, pH values of the urine, adsorbent dose, adsorption time and so on, were optimized to achieve the excellent extraction performance. The detection limit of Bisphenol A in human urine
was 1.0 ng · mL−1 (S/N = 3), and the standard curve was linear in the range of 5.0 ng · mL−1˜200.0 ng · mL−1 (r = 0.9993). The average recovery of Bisphenol A was 78.5˜96.2% at three spiked levels in
the range of 5.00 ng · mL−1˜200.00 ng·mL−1. The method was proved simple, practical and highly sensitive, which could satisfy the request for the determination of Bisphenol A in human urine.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
Biochar
·
2022
·Vol. 4
·期 1
·1-11
·
IF 11.452
Li Yinxue,Shang Hongru,Cao Yongna,Yang Chunhui,Feng Yujie,Yu Yanling
To remove antibiotics from waste water, an alkali active porous biochar, 850BC, was prepared from corncob xylose residue. In preparation, NaOH dipping was used for silicon removal and KOH activation was operated at 850℃. Further characterization containing BET, SEM, and FTIR were confirmed. 850BC possessed a huge specific surface area of 3043 m 2 ·g −1 , developed pore structure and abundant oxygen functional groups. The adsorption performance of sulfamethoxazole on 850BC was quick and efficient, and the adsorption capacity reached 1429 mg·g −1 , which was significantly higher than other adsorbents reported previously. While pseudo-second-order kinetic model and Langmuir model could better describe the adsorption, chemisorption dominated the SMX adsorption onto 850BC. In virtue of pore-filling and π–π interaction as major mechanism, a large surface area and rich oxygen-containing functional groups led to an excellent adsorption performance. Thus, this preparation method provided a biochar-based adsorbent with enhanced specific surface for efficient removal of antibiotic pollutants. Graphical Abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Yunshu Jiang,Yunlong Chen,Futing Zi,Xianzhi Hu,Shuliang Chen,Puqiang He,Li Zhao,Xinrong Li,Jiao Li,Yue Lin,Zhujuan Li
Compared with the cyanide method, the thiosulfate method is a green and clean gold production method, while gold recovery from thiosulfate solution is pending. Although the activated carbon adsorption method has been highlighted, current studies cannot avoid the complexity of activated carbon modification. This study used thiosemicarbazide (TSC) as the additive of the gold solution, investigating the gold recovery performance of pristine activated carbon and its adsorption mechanism. As a result, even for containing gold 100 mg/L, gold adsorption percentage close to 100% could be achieved on original carbon within 12 h when adding 0.02 g TSC. Next, under the optimal conditions, gold loading amount of 42.6 kg/t was attained after five-stage adsorption. Characterization via XPS , FT-IR, BET, and UV–vis verified the gold adsorption mechanism was related to TSC's decomposition into SCN − under activated carbon's catalysis, the formation of Au(SCN) 2 - and whose adsorption on the surface of original carbon. Furthermore, it was found that this method exhibited well gold recovery ability (99%) for gold in both Cu 2+ -en-S 2 O 3 2− and Cu 2+ -NH 3 -S 2 O 3 2− solutions; Additionally, well gold recovery performance (99%) was also achieved for two leaching solutions (Au: 35 and 42 mg/L, Cu 2+ : 3178 mg/L) of an actual ore. Last, gold desorption studies indicated that a good gold desorption rate of 95.3% was achieved within 24 h for carbon containing 5 kg/t of gold when using N, N-dimethylformamide (DMF) as desorbent . This paper gifted untreated activated carbon with excellent adsorption ability towards gold in thiosulfate system for the first time, which is meaningful for the cleaner production gold.
研究领域:
环境科学
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材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
Green Chemical Engineering
·
2022
·
IF 0
Pei-Lin Yi,Wen-Jie Zhang,Ling-Hui Kong,Rong-Fang Shen,Xiao-Jing Guo,Xi Yan,Yan Chen,Wan-Zhong Lang
Herein, we demonstrated that various activated carbons could be endowed with high ability activating peroxymonosulfate (PMS) just through pyrolysis for the degradation of various organic pollutants. The ofloxacin (OFX) was proved to be degraded rather than adsorbed in the advanced oxidation processes. The catalyst showed good stability and could be recovered by simple pyrolysis showing the initial activity. The defects were identified as active sites of the catalyst, and π-π∗ shake up was related to the catalyst activity. Mediated electron transfer was verified to be responsible for the degradation of OFX. The inhibition effect of furfuryl alcohol (FFA) on the degradation of contaminant was proved to be insufficient to verify 1 O 2 . The main OFX degradation intermediates were identified by LC-MS, and possible degradation pathways were proposed. This study provided a simple way for the development of low-cost, metal-free, and high-efficient carbonaceous materials to activate PMS in advanced oxidation processes, and proposed new insights for the exploration of PMS activation mechanism.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
Applied Sciences-Basel
·
2021
·Vol. 11
·期 12
·5522
·
IF 2.679
Changjin Liang,Shaomin Lin,Guiwen Liu
Featured ApplicationDue to the particularity of the source, the sludge can be fired into biochar ceramsite without adding other auxiliary materials, and can be used as the padding of constructed wetland.AbstractBiochar ceramsite was prepared from residual sludge at different temperatures. Specific surface area, compressive strength, and toxic leaching tests were used to compare the properties. Through tests and scanning electron microscopy (SEM), it was found that with the increase of preparation temperature, the ceramsite showed higher porosity, larger specific surface area, and better compressive strength. The leaching amount of toxic heavy metals is low when the temperature is higher than 650 °C. According to X-ray diffraction (XRD) analysis, the main component of sludge is quartz. There were amounts of iron and aluminum in sludge, which were the main reason for its good adsorption efficiency. Through the adsorption experiment on Cr(VI), it was found that the adsorption efficiency of the ceramsite on Cr(VI) was better at low pH, and the adsorption isotherm fitted well with Langmuir and Freundlich types. The adsorption process had both monolayer adsorption and multilayer adsorption, and the adsorption process was in line with the pseudo-second-order kinetics.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Carbon Capture Science & Technology
·
2023
·
IF 0
Xuan Wang,Yaoxing Wang,Xueqi Li,Jian Li,Yanjun Xie,Daxin Liang,Wentao Gan
Utilizing abundantly available biomass materials to prepare adsorbent substances is a simple and cost-effective method for CO 2 adsorption, which, however, is often hampered by low adsorption capacity. Here, we demonstrate near-spherical active carbon (C-DWP/Zn) with high CO 2 adsorption ability, employing delignification combination with ZnCl 2 activation of natural wood powder. Removing lignin from wood cell walls facilitates easy absorption of Zn ions by the cellulose nanofibers (CNFs), thereby promoting micro/nano pores formation. Moreover, rapid dehydration of cellulose molecular chains alters the morphology of activated carbon, resulting in a transition from a granular to a near-spherical shape. Consequently, C-DWP/Zn with high specific surface area of 1769 m 2 g −1 , shows a significantly higher microporous volume than that of a control sample without delignification. The CO 2 adsorption capacity of C-DWP/Zn, with values of 3.51 mmol g −1 and 5.12 mmol g −1 at 1 bar, 25 °C and 0 °C, respectively, is superior to that of commercial activated carbon. Attributable to its optimal micropore structure, C-DWP/Zn exhibits high CO 2 /N 2 selectivity. Furthermore, the high carbon dioxide adsorption efficiency of C-DWP/Zn was maintained and the substance could be reused at least 20 times. Near-spherical active carbon adsorbents prepared from low-value wood powders, all featuring high CO 2 adsorption performances, reasonable CO 2 /N 2 selectivity, good recoverability, suitable heat of adsorption, and fast adsorption kinetics, which are promising candidates for practical CO 2 adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Jun Liao,Xiaoshan He,Yong Zhang,Wenkun Zhu,Lin Zhang,Zhibing He
In this work, Bi 2 O 3 doped horse manure-derived biochar was obtained by carbonizing the H 2 O 2 -modified horse manure loaded with bismuth nitrate under nitrogen atmosphere at 500 °C. The results showed that there was a sharp response between the as-prepared bismuth impregnated biochar and uranium(VI) species in solution, which resulted in a short equilibrium time (<80 min), a fast adsorption rate (about 5.0 mg/(g·min)), a high removal efficiency (93.9%) and a large adsorption capacity (516.5 mg/g) ( T = 298 K, pH = 4, C i = 10 mg/L and m/V = 0.1 g/L). Besides, the removal behavior of the bismuth impregnated biochar for uranium(VI) did not depend on the interfering ions and ion strength, except Al 3+ , Ca 2+ , CO 3 2− and PO 4 3− . These results indicated that the modified biochar might possess the potential of remediating the actual uranium(VI)-containing wastewater. Moreover, the interaction mechanism between Bi 2 O 3 doped biochar and uranium(VI) species was further explored. The results demonstrated that the enrichment of uranium(VI) on the surface of the as-prepared biochar was controlled by various factors, such as surface complexation, ion exchange, electrostatic attraction, precipitation and reduction, which facilitated the adsorption of uranium(VI) on the bismuth impregnated biochar.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Huihui Zhang,Lushi Tan,Zhejuan Zhang,Guirong Zhang,Jiaxing Lu
In this work, different mass percentage of activated carbon (YBC) doped carbon paste electrodes (YBCPE) were firstly prepared, then electrodeposition of Pt nanoparticles was performed at a constant potential -0.1 V vs. Ag|AgCl|KCl (3 M) to prepare working electrodes Pt/YBCPE. It was shown that Pt/YBCPE(16%) exhibits the highest mass activity for formaldehyde oxidation compared to platinum deposited on pure carbon paste electrode (CPE) and other YBCPE(X%) electrodes. Afterwards, poly-o-anisidine (POA) film was prepared by electro-polymerization onto the CPE and YBCPE(16%) in o-anisidine monomer solution at 0.7 V and then Pt nanoparticles were electro-deposited at the POA film surface for fabrication of the Pt/POA/CPE and Pt/POA/YBCPE composite electrodes. The morphology of the composite electrodes was characterized by SEM, TEM, XRD and XPS which revealed that the presence of YBC and POA in the composite electrodes significantly improves the dispersion of Pt nanoparticles on the electrodes. Electrochemical impedance spectroscopy (EIS), chronoamperometry and cyclic voltammetry were used to verify the conductivity and durability of the composite electrode and its electro-catalytic activity. The obtained results indicated that the Pt/POA(16mC)/YBCPE(16%) exhibits excellent electro-catalytic activity towards the formaldehyde oxidation owing to the synergistic effect of the support-catalyst. Some comparisons for the electrooxidation of formaldehyde and the electrooxidation of methanol and formic acid on the composite electrodes also were conducted.
研究领域:
材料科学
·
电化学
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 23
·23981-23993
·
IF 2.914
Li Lincheng,Zhong Dengjie,Xu Yunlan,Zhong Nianbing
In order to improve the adsorption efficiency of the adsorbent and solve the problem of separation difficulty, a novel superparamagnetic micro-nano-bio-adsorbent (PDA/Fe 3 O 4 /BC) was prepared by in situ self-assembly of polydopamine (PDA). The results of scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), X-ray photoelectron spectrometer (XPS), and vibrating sample magnetometer (VSM) characterization showed that the size of bio-adsorbent was about 200 nm. PDA and Fe 3 O 4 modifications increased the specific surface area of adsorbent, changed the surface functional group of biochar (BC), and made the adsorbent have super-high magnetization (294.76 emu g −1 ). PDA/Fe 3 O 4 /BC was applied to treat Cr wastewater. The results show that the adsorption of Cr by PDA/Fe 3 O 4 /BC includes single-layer and multilayer adsorption. The adsorption follows the pseudo-second-order kinetic model. The adsorption is spontaneous and endothermic, and its maximum adsorption capacity and activation energy are 25.25 mg g −1 at 318 K and 23.108 kJ mol −1 , respectively. After adsorption treatment, PDA/Fe 3 O 4 /BC still possesses high magnetization (233.04 emu g −1 ). PDA/Fe 3 O 4 /BC can treat actual electroplating wastewater with Cr(VI) concentration from 20 mg L −1 to less than 0.2 mg L −1 , which met the PRC discharge standard (GB/21900-2008) of electroplating pollutants.
Graphical abstract
研究领域:
环境科学
·
环境工程
·
纳米材料
·
水污染治理
·
应用化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Lei Wu,Guansheng Qi,Wei Lu,Zhenglong He,Jialiang Li,Jinliang Li,Min He
In the process of coal mining, coal spontaneous combustion in the gob area poses serious threats to the safety of mine production. Besides, coal combustion also produces a large amount of greenhouse gas CO 2 , which triggers a series of ecological environment problems. In order to solve these two problems, the idea of mineralizing CO 2 with the alkaline industrial waste calcium carbide slag and then sending the foams to the gob area for coal spontaneous combustion prevention was proposed in this study. First, the effects of calcium carbide slag foaming under the action of different types of foaming agents, including sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS), polyoxyethylene fatty alcohol sodium sulfate (AES), and octyl decyl glucoside (APG0810), were tested and analyzed. Furthermore, the effects of water glass (WG), sodium alginate (SA), polyvinyl alcohol 1799 (PVA), cement, and silica micro-powder on the foam stability were analyzed by investigating the stability coefficient and drainage volume of calcium carbide slag foam. On this basis, the configuration scheme of calcium carbide slag foam with high efficiency and good stability was determined. The experimental results on CO 2 mineralization and coal spontaneous combustion inhibition reveal that the prepared calcium carbide slag foam can rapidly absorb CO 2 . Moreover, after calcium carbide slag foam treatment, the spontaneous combustion tendency of the coal sample is significantly reduced.
研究领域:
矿业工程
·
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）