Nanomaterials
·
2022
·Vol. 12
·期 12
·1988
·
IF 5.719
Xin Zhao,Peiling Yuan,Ziyan Yang,Wei Peng,Xiang Meng,Jiang Cheng
From the perspective of treating wastes with wastes, bamboo sawdust was integrated with a hydroxyapatite (HAP) precursor to create engineered nano-HAP/micro-biochar composites (HBCs) by optimizing the co-precipitated precursor contents and co-pyrolysis temperature (300, 450, 600 °C). The physicochemical properties of HBCs, including morphologies, porosities, component ratios, crystalline structures, surface elemental chemical states, surface functional groups, and zeta potentials as a function of carbonization temperatures and components of precursors, were studied. Biochar matrix as an efficient carrier with enhanced specific surface area to prevent HAP from aggregation was desired. The sorption behavior of heavy metal (Cu(II), Cd(II), and Pb(II)) and pharmaceuticals (carbamazepine and tetracycline) on HBCs were analyzed given various geochemical conditions, including contact time, pH value, ionic strength, inferencing cations and anions, coexisting humic acid, and ambient temperature. HBCs could capture these pollutants efficiently from both simulated wastewaters and real waters. Combined with spectroscopic techniques, proper multiple dominant sorption mechanisms for each sorbate were elucidated separately. HBCs presented excellent reusability for the removal of these pollutants through six recycles, except for tetracycline. The results of this study provide meaningful insight into the proper integration of biochar–mineral composites for the management of aquatic heavy metals and pharmaceuticals.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
·
2020
·Vol. 53
·期 9
·526-532
·
IF 0.651
Lianzhong Shen,Guiying Xu,Beibei Han,Hui Ge,Shigekazu Kato,Youyuan Dai,Kun Wang,Fei Sun,Weimin Zhou
In this study, carbon black (CB) and carbon (coal-tar pitch-based spherical activated carbon (SAC)) were used to successfully fabricate composite-type SAC (CB/coal-tar-pitch-SAC), and its surface was coated with TiO2 to produce the composite material TiO2/CB/coal-tar-pitch-SAC. CB helps in decreasing the pore size of CB/coal-tar-pitch-SAC and increasing its specific surface area and total pore volume, which can be verified by the Brunauer–Emmett–Teller (BET) method. Practically, TiO2/CB/coal-tar-pitch-SAC can sterilize the bacteria present in the water. This study intensively verifies the high reusing sterilization capacity of TiO2/CB/coal-tar-pitch-SAC. The results indicate that TiO2/CB/coal-tar-pitch-SAC can effectively improve the water environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 13
·7301-7315
·
IF 6.123
Gao Tianliang,Zhao Chuanshan,Wang Sha,Li Xia,Ding Qijun
Activated carbon paper-based materials were prepared from softwood pulp, activated carbon powder, and polyester fiber through wet forming process. Then polyethyleneimine was loaded on the activated carbon paper-based materials using physical impregnation method to fabricate green, low cost, and degradable PEI/activated carbon composite paper-based adsorbent materials (PPCA) for the removal of Cr(VI) from drinking water. The surface characteristics of the adsorbent were analyzed by SEM, EDX, BET, FT-IR, and XPS. It was found that the maximum adsorption capacity of Cr(VI) could reach up to 1.58 mg g −1 when the PEI immersion concentration is 1%, the contact time is 180 min, the temperature is 30 °C and pH = 2. The adsorption of Cr(VI) on PPCA conformed to both the freundlich isotherm model and the quasi-second-order kinetic model, indicating that the adsorption was multi-molecular layer adsorption controlled by chemical reaction process. The adsorption mechanism of Cr(VI) on PPCA included electrostatic attraction, redox and chelation. Overall, this study provides a green, large-scalable production way for the preparation of biodegradable adsorption materials for the efficient removal of Cr(VI) from drinking water aiding the safe management of aqueous system. 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 ENVIRONMENTAL ENGINEERING
·
2021
·Vol. 147
·期 10
·04021038
·
IF 1.86
Yanling Guo,Yanan Cheng,Bingli Wang,Xueke Li,Wanfeng Wang
Nitrosamines have become a focus of considerable research because of their carcinogenicity and environmental universality. In this study, to effectively remove nitrosamines, biological activated carbon (BAC) was acclimatized by a nitrosamine-reducing bacterial strain, and zero-valent iron (Fe0)-assisted BAC was used to degrade nitrosamines from aqueous solution. The influencing factors and degradation mechanism were investigated. Compared with activated carbon (AC), the removal efficiency of more strongly polar nitrosamines by BAC and BAC_Fe0 increased prominently (21.0%–32.3%), yet there was no change between BAC and BAC_Fe0. The highest ratios of nitrosamine degradation by BAC_Fe0 were 49.8%–99.0%, and degradation reaction kinetics conformed best to a pseudo-second-order model (?2>0.9269). The rate constants ?obs for six nitrosamines ranged from 3.4×103 to 6.9 × 105 (M · s)−1. Additionally, the removal ratios and ?2 of the linear nitrosamines partially scaled with their molecular weight, Log??, and Log??? (?2=0.5661−0.952). All nitrosamines were degraded within 30 min under strong acidic conditions; the removal ratios increased by 11.2%−23.1% under anaerobic conditions, but were decreased by ∼10% in the presence of humic acid. The primary degradation products were secondary amines, methylamine, formic acid, nitrate, and nitrite resulting from the reduction of Fe0 and biodegradation by the nitrosamine-reducing bacteria.
研究领域:
环境科学
·
微生物学
·
材料科学
✓ 已验证
DOI
高影响因子
Bioresource Technology Reports
·
2022
·
IF 0
Sen Lin,Yihong Guo,Lei Zhou,Hongjun Yang
Quantitative effects of surface oxidation on Cd 2+ adsorption performance of biochar derived from long-root Eichhornia Crassipes plants were systematically investigated. It was revealed that oxidation degree was positively related with the intensity of surface functional groups and harmless for the structural stability, while biochar yield would decline sharply resulting from for over-oxidization. Correspondingly, the Cd 2+ adsorption capacity exhibited an uptrend with the increasing oxidation on account of the abundant adsorption sites. Moreover, Cd 2+ adsorption on the biochar with different oxidation degrees were also investigated comprehensively, indicating adsorption performances in a similar trend highly sensitive to solution pH and ionic strength . In addition, the adsorption isotherms were found to manifest the saturated adsorption capacity for Cd 2+ increased from 0.333 mol/g to 0.487 mmol/g at 30 °C by strengthening oxidation. All synthesized biochar could keep consistent adsorption performance in multiple adsorption-desorption cycles.
研究领域:
环境科学
·
材料科学
·
生态学
✓ 已验证
DOI
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Shangxing Chen,Linjian Li,Yangping Wen,Guangyao Yang,Guangbin Liu,Yufu Yi,Qingyin Shang,Xiuxia Yang,Shuo Cai
A simple and cheap thick-walled Moso biochar (BC) was selected and combined with carbonate minerals dolomite (DM) to construct a voltammetric sensing platform for application in stripping analysis of thiamethoxam in agricultural and environmental samples. The BC based on thick-walled Moso was prepared by pyrolyzing biomass wastes in limited oxygen atmosphere at temperatures of 600 °C for 2 h, and the BC-DM nanocomposite was obtained through milling and sieving, then liquidphase ultrasonic assistance by dispersing grinded DM and moso bamboo BC into ultra-pure water. The morphology and structure of the BC-DM nanocomposite were characterized by FT-IR, XRD, and SEM-EDX. Under optimal conditions, the BC-DM modified electrode showed high sensitivity and good stripping voltammetric response towards thiamethoxam in a linear range from 0.5 to 35 μg mL -1 with a limit of detection (LOD) of 0.22 μg mL -1 . The prepared nanocomposite sensor was employed for the determination of thiamethoxam in different real samples with acceptable recoveries. Thickwalled moso as biochar with post-modification provides a new promising platform for potential applications in electrochemistry.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Tiantian Nie,Pulin Hao,Zhendong Zhao,Wenjun Zhou,Lizhong Zhu
The bamboo biochars pyrolyzed at 400 °C and 600 °C (BC400 and BC600) were modified by hydrogen peroxide (H 2 O 2 ) to obtain the oxidized biochars. Biochar stability and the effect of oxidation treatment on the adsorption and co-adsorption of tetracycline (TC) and Cu 2+ onto biochars were investigated. The calculated carbon loss of biochars after oxidation treatment indicated that BC600 presented higher carbon stability than BC400 due to the condensed aromatic structure of biochar. Moreover, oxidation treatment introduced O-containing functional groups on biochar surface, but destructed the aromatic structures of oxidized biochars, which in turn affected the adsorption capacity of biochars for TC and Cu 2+ . Oxidation treatment obviously enhanced the adsorption of TC and Cu 2+ onto BC400 owing to the increase of O-containing functional groups, but significantly decreased TC and Cu 2+ adsorption onto BC600 because of the decreased π - π dispersive forces between biochar and adsorbate. The promotion effect of Cu 2+ on TC adsorption onto BC400 changed into inhibition effect after chemical oxidation owing to the pore blockage. However, the promotion degree of Cu 2+ for TC adsorption onto BC600 was enhanced through oxidation treatment due to electrostatic attraction and complexation. Meanwhile, oxidation treatment reduced the inhibition degrees of TC for Cu 2+ adsorption onto biochars, which was attributed to the increased amount of electron-rich groups. The results are helpful for the application of biochars in the soils remediation .
研究领域:
环境科学
·
土壤修复
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jie Dong,Weihua Xu,Shaobo Liu,Youzi Gong,Ting Yang,Li Du,Qiang Chen,Xiaofei Tan,Yunguo Liu
The conversion of biomass wastes to highly efficient biochar-based catalysts has attracted more and more attention because it meets the environmental protection concept of waste recycling. In this work, a novel magnetic catalyst (CoFe 2 O 4 @BC) was developed by using alkaline lignin, the dominant by-products of papermaking industry, as feedstock for biochar. More importantly, PAA (CH 3 C(=O) OOH) was successfully activated by CoFe 2 O 4 @BC nanoparticles for sulfamethoxazole (SMX) elimination. The catalytic activity of CoFe 2 O 4 @BC on PAA activation was systematically studied. When PAA was 825 μM and CoFe 2 O 4 @BC was 100 mg/L, 10 mg/L SMX could be completely degraded. The cycle of Co 3+ /Co 2+ of CoFe 2 O 4 @BC prompted the generation of acetyl(per)oxyl groups (CH 3 C(O)O• and CH 3 C(O)OO•), which were believed to be the dominant reactive substances for SMX degradation. The degradation of SMX was promoted under near-neutral pH conditions, and was inhibited when humic acid and HCO 3 − were added, while the Cl − showed a negligible influence. According to the analysis of oxidation products, three main transformation pathways of SMX were illustrated. The remarkable stability and magnetic separability of CoFe 2 O 4 @BC make it have a wider application prospect in the treatment of various wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2014
·Vol. 113
·期 1
·211-223
·
IF 0.983
Wang Chenwei,Gui Xia,Yun Zhi
A new activated carbon catalyst (AC) with relatively high density of –SO 3 H group was synthesized by HNO 3 oxidation followed by sulfonation with H 2 SO 4 . After 10 wt% HNO 3 oxidation for 8 h and subsequent sulfonation for 15 h, the total acid density and the density of the –SO 3 H group in AC were determined by titration to be 4.43 mmol/g and 0.93 mmol/g, respectively. The resulting AC exhibited relatively high catalytic performance for the esterification of lauric and oleic acid in methanol, which was due to an obvious increasing of –SO 3 H group density. In the meantime, the catalytic performance correlated with density of total acidity and esterification rates was also revealed.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2016
·
IF 4.312
Peigao Duan,Caicai Zhang,Feng Wang,Jie Fu,Xiuyang Lü,Yuping Xu,Xianlei Shi
This study examined a two-stage (noncatalytic pretreatment followed by catalytic upgrading) hydrothermal processing of crude bio-oil produced from the hydrothermal liquefaction of duckweed. The activities of six activated carbons (ACs)-pine wood AC, coconut shell AC, bamboo stem AC, apricot pit AC, peach pit AC, and coal AC-toward the deoxygenation and denitrogenation of the pretreated duckweed bio-oil were determined in supercritical water at 400 °C for 1 h with the addition of 6 MPa of H 2 and 10 wt% AC. All of the ACs exhibited activity similar to Ru/C toward the denitrogenation and deoxygenation of the pretreated duckweed bio-oil. Of the ACs tested, bamboo stem AC produced an upgraded bio-oil with the highest yield (76.3 wt%), the highest fraction (90.13%) of material boiling below 350 °C, and the highest energy density (44.1 MJ/kg). Decreased ash and acidic groups in the pre-treated AC disfavored the production of upgraded bio-oil but aided denitrogenation and desulfurization. The ACs are suspected to leach ions and weak acids into the reaction solution, which would catalyze denitrogenation and desulfurization. The gases mainly consisted of unreacted H 2 , CO 2 and CH 4 together with small amounts of C x H y ( x ≤ 5, y ≤ 12) hydrocarbon gases produced from the cracking of the upgraded bio-oil.
研究领域:
能源植物学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Wenbin Gao,Yuzhen Chen,Jiahao Rao,Zhan Hu,Yan Tan,Yujiao Wen,Yifan Wang,Zhi Zhou,Yongfa Zhu,Nan Zhou
Biochar currently served as the support for dispersed metal nanoparticles and cooperated with pyrite to generate more reactive radicals in organic pollution degradation system. But the mechanism of interaction between biochar and pyrite has not been elucidated. In this paper, biochar with oxygen-containing functional groups (OFGs) served as a stable dispersant to prepare nano-Fe x S y loaded biochar materials (BC OFGs @nano-Fe x S y ). BC OFGs coordinated with nano-Fe x S y to overcome its drawbacks, boosting QNC removal efficiency from 28.64% to 100%. The XPS and the linear sweep voltammetry (LSV) results revealed higher Fe(II) content and higher electron transfer rate on used BC OFGs @nano-Fe x S y , further validating that hydroxyl functional groups on biochar surface provided electrons to Fe(III) to achieve efficient Fe(II)/Fe(III) cycling. Based on comparative experiments and studies on the roles of iron, S(II) species and OFGs, we clearly revealed that OFGs on biochar materials surface coordinated with nano-Fe x S y to catalyze the degradation of QNC. The degradation efficiency of BC OFGs @nano-Fe x S y for QNC was still as high as 91.39% after five cycles, providing full demonstrations that OFGs and S(II) as the abundant electron donor coordinated with Fe species for QNC catalytic degradation and further enhanced the catalytic performance and stability of nano-Fe x S y .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 10
·100528
·
IF 4.316
Zhanwei Xu,Hao Yan,Kai Yao,Kang Li,Jiayin Li,Keren Jiang,Zhi Li
Efficient catalysts for the reduction reaction of SOCl2 are desired for lithium/thionyl chloride batteries with high and stable voltage. In this work, iron phthalocyanine particulates fixed on activated carbon substrates (FePc/AC) are synthesized by an in situ solid approach under the temperatures lower than 300 °C. U–T curves, the value distance to the average U, dU/dT via mathematical differentiation and numerical analysis were employed to investigate to the catalytic reduction of SOCl2 systematically. The U–T curve of the battery containing the FePc/AC displays almost perfect rectangle profile. The average voltage of the battery contains the FePc/AC is 3.00 V, 0.21 V higher than that without the catalysts. After discharge, the surface of the carbon cathode containing FePc/AC displays a well-constructed loose morphology composed of LiCl nanoparticles around 100 nm in diameter. The inside of carbon cathode shows a dense morphology with a mount of nano holes around 50 nm, indicating that the formed LiCl permeates into the interior of the carbon cathode, attributing to that the FePc/AC nanocomposite catalysts facilitate the reduction of SOCl2, leading the formation loose LiCl film in nano scale for electrolyte SOCl2 and the formed LiCl diffusion.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）