Russian Journal of Physical Chemistry A
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2021
·Vol. 95
·期 10
·2031-2041
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IF 0.691
Yan Xiaoju,Sun Yue,Ma Cong,Kong Xiangji,Zhang Yan,Tao Wen
Abstract This research compared the adsorption behavior of anionic dye methyl orange (MO) and cationic dye methylene blue (MB) by five carbon materials, i.e. rice husk biochar (RH), sawdust biochar (SD), activated carbon (AC), bamboo biochar (BB) and palm biochar (PB). Scanning electron microscopy (SEM), Boehm titration, Brunauer–Emmett–Teller (BET) analysis and zeta potential were used to characterize the physicochemical properties of the adsorbents. The pH had a great influence on the adsorption processes. The adsorption processes for two dyes followed the pseudo-second order kinetic model. The Langmuir, Freundlich and Temkin isotherm models all showed good fit to the experimental adsorption data. The thermodynamic studies revealed that all the reactions of MO were exothermic processes with decrease in entropy, while those of MB were just the opposite. The adsorption capacity of RH was the highest, which may be due to its physicochemical properties. The adsorption capacities of SD were the smallest, and the poor physiochemical properties of PB caused that the dyes adsorption onto PB was non-spontaneous and non-feasible. All adsorbents showed higher adsorption capacity for MB than that for MO, which may be due to the additional electrostatic attraction effect between adsorbents and cationic MB dye.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
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IF 8
Stelgen Inkoua,Chao Li,Muhammad Rashid,Muhammad Mahboob Naeem,Shu Zhang,Wenran Gao,Mortaza Gholizadeh,Xun Hu
Spirulina platensis contains abundant nitrogen-containing organics, which might react with derivatives of cellulose/lignin during hydrothermal carbonization (HTC), probably affecting yield, property of hydrochar , and pore development in activation of hydrochar. This was investigated herein by conducting co-HTC of spirulina platensis with cellulose, lignin, and sawdust at 260 °C and subsequent activation of the resulting hydrochars with K 2 C 2 O 4 at 800 °C. The results showed that cross-condensation of spirulina platensis-derived proteins with cellulose/lignin-derived ketones and phenolics did take place in the co-HTC, forming more π-conjugated heavier organics, retaining more nitrogen species in hydrochar, reducing yields of hydrochar, making the hydrochar more aromatic and increasing the thermal stability and resistivity towards activation. This enhanced the yield of activated carbon (AC) by 7 %–20 % and significantly increased specific surface area of the AC from activation of hydrochar of spirulina platensis + lignin to 2074.5 m 2 /g (859.3 m 2 /g from spirulina platensis only and 1170.1 m 2 /g from lignin only). Furthermore, more mesopores from activation of hydrochar of spirulina platensis + cellulose (47 %) and more micropores from activation of hydrochar of spirulina + sawdust (93 %) was generated. The AC from spirulina platensis + lignin with the developed pore structures generated sufficient sites for adsorption of tetracycline from aqueous phase and minimized steric hindrance for mass transfer with the abundant mesopores (43 %).
研究领域:
生物工程
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材料科学
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Bing Zhang,Xin Mao,Yu Shen,Tengfei Ma,Bing Zhang,Bin Liu,Wenxin Shi
The structural variances of adsorbents play a crucial role in determining the number of effective adsorption sites and pretreatment performance. However, there is still a gap in comprehending the impact of different carbon structural adsorbents on membrane fouling . Therefore, this study aimed to compare the efficacy of granular activated carbon (GAC), powdered activated carbon (PAC), and activated carbon fiber (ACF) in mitigating membrane fouling during municipal sewage reclamation using an aerobic granular sludge membrane bioreactor (AGMBR). The results demonstrated that the utilization of PAC significantly enhanced the normalized flux and reduced fouling resistance in comparison to GAC and ACF systems. PAC effectively adsorbed low and medium-molecular-weight pollutants present in raw sewage, resulting in an increase in average particle size and a decrease in foulant content on the membrane surface. The Hermia model indicated that adsorption pretreatment minimized standard blocking while promoting the formation of a sparse and porous cake layer. Moreover, according to the extended Derjaguin–Landau–Verwey–Overbeek theory, PAC has been demonstrated as the optimal antifouling system owing to its enhanced repulsion between membrane-foulant and foulant-foulant interactions. Correlation analysis revealed that the exceptional antifouling performance of the PAC system was due to its high removal rates of chemical oxygen demand (~78 %) and suspended solids (~97 %). This research offers valuable insights into the mitigation of membrane fouling through the utilization of adsorbents featuring diverse carbon structures .
研究领域:
环境科学
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污水处理
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DOI
PubMed
高影响因子
CHEMOSPHERE
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2019
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IF 5.108
Liping Lou,Qian Huang,Yiling Lou,Jingrang Lu,Baolan Hu,Qi Lin
To investigate the role of adsorption by biochar and biodegradation by bacteria in the wastewater treatment system of microorganisms immobilized on biochar, Nonylphenol (NP) removal (adsorption + degradation) rates and degradation rates from water by NP degrading bacteria immobilized on bamboo charcoal (BC) and wood charcoal (WC) were examined in a short-term and long-term. Results showed that cells immobilized on different biochar had different NP removal effects, and cells immobilized on bamboo charcoal (I-BC) was better. After eight rounds of long-term reuse, the cumulative removal rate and the degradation rate of NP in water by I-BC were 93.95% and 41.86%, respectively, significantly higher than those of cells immobilized on wood charcoal (69.60%, 22.78%) and free cells (64.79%, 19.49%) (P < 0.01). The rise in the ratio of the degradation rate to the removal rate indicated that the long-term NP removal effect is more dependent on biodegradation. The amount of residual NP in I-BC still accounted for about 50%, indicating that the secondary pollution in the disposal of carrier could not be ignored. In addition, promotion effect of biochar on microorganisms were observed by SEM , quantitative PCR and 16S rRNA. Pseudomonas , Achromobacter , Ochrobactrum and Stenotrophomonas were predominant bacteria for NP degradation. The addition of biochar (especially bamboo charcoal) also effectively delayed the transformation of their community structure.
研究领域:
环境工程
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微生物学
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水处理
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 21
·21609-21618
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IF 2.914
Tan Guangcai,Mao Yi,Wang Hongyuan,Junaid Muhammad,Xu Nan
Biochar (BC) and activated carbon (AC) were both produced from corn straw. Biochar-supported zerovalent iron (BC-ZVI) and activated carbon-supported zerovalent iron (AC-ZVI) were synthesized and applied for Se(IV)/Se(VI) removal. The sorption capacity of BC-ZVI for Se(IV) and Se(VI) was reported at 62.52 and 35.39 mg g −1 , higher than that of AC-ZVI (56.02 and 33.24 mg g −1 ), respectively, due to its higher iron content and more positive charges. The spectroscopic analyses showed that Se(IV)/Se(VI) were reduced to Se(0)/Se(-II) of less toxicity and solubility. The effects of various factors such as pH, ionic strength, co-existing cations and anions, and natural organic matter (NOM) were also investigated. Ionic strength showed no significant effect on Se(IV)/Se(VI) removal, but pH was critical. The presence of NO 3 − and SO 4 2− did not cause obvious inhibition to the removal, while PO 4 3− inhibited the sorption capacity of BC-ZVI and AC-ZVI for Se(IV)/Se(VI) significantly. Common cations (K + , Ca 2+ , and Mg 2+ ) were found to slightly enhance the removal, while NOM significantly decreased the sorption capacity of BC-ZVI and AC-ZVI for Se(IV)/Se(VI). Besides, NOM showed stronger inhibition effect on AC-ZVI than that on BC-ZVI. These results indicated that BC-ZVI, compared with AC-ZVI, could be a promising sorbent to remove Se(IV)/Se(VI) due to its low cost and high efficiency.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2015
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IF 4.642
Yawei Shi,Xiangwen Zhang,Guozhu Liu
Activated carbons derived from hydrothermal carbonization of sucrose and subsequent KOH activation have been prepared and tested for the adsorptive removal of refractory thiophenic compounds. Textural and chemical properties of the carbons and their corresponding impacts on adsorption rates and capacities were discussed in detail. The optimum carbon possessed high adsorption capacity (41.5 mgS/g for 300 ppmwS model oil), fast adsorption rate (97% saturated within 5 min) as well as relatively good selectivity for the adsorption of thiophenic compounds due to the abundant small micropores, suitable mesopore fraction and various oxygen functionalities present in the carbon. Combined with the economic and environmental merits of the preparation procedure, the sucrose-derived activated carbons are promising candidates for potential practical applications.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
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IF 6.9
Xin Zhong,Chao Li,Yuewen Shao,Lijun Zhang,Shu Zhang,Xun Hu
Bio-oil, a major product from biomass pyrolysis, is a renewable source for production of functional carbon materials such as activated carbon (AC). Bio-oil can be activated directly via mixing with an activator or be pre-carbonized followed by subsequent activation. These two processes feature with distinct reaction network and might affect pore characteristics in different ways. This was investigated herein by direct activation of bio-oil or biochar from pre-carbonization of bio-oil using K 2 C 2 O 4 or KOH as the activator at 800 ºC. The results indicated that bio-oil was pre-carbonized into biochar at 500 ºC improved yields of AC (83.6 % versus 17.5 % from direct activation of bio-oil with K 2 C 2 O 4 ) through enhanced aromatic degree and resistivity to cracking. This also diminished specific surface area of resulting AC (716.3 versus 1035.5 m 2 g −1 from direct activation). Much more intensive cracking reactions in direct activation of bio-oil with K 2 C 2 O 4 were confirmed with in-situ IR technique. This not only formed AC of more developed pore structures, especially more mesopores/macropores, but also generated gases as dominate product (yield: 74.5 %). Similar result was observed from activation with KOH, but KOH was more effective than K 2 C 2 O 4 for cracking. This, however, did not result in AC of more developed pore structures, as the K 2 CO 3 derived from KOH tended to be wrapped with organics in direct activation of bio-oil and was difficult to be washed away, blocking pores generated.
研究领域:
能源材料
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化学工程
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DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 109
·63620-63626
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IF 3.708
Yuchen Liu,Xiangdong Zhu,Feng Qian,Shicheng Zhang,Jianmin Chen
Recently, considerable attention has been given to the hydrothermal liquefaction (HTL) of waste rice straw for the production of bio-oil and hydrochar. However, hydrochar material could not be directly applied in the environmental field, due to its limited porosity and surface area. In order to improve the porosity and adsorption capacity of rice straw-derived hydrochar, it was activated and magnetized to a magnetic activated carbon. The activation condition for hydrochar was firstly considered, due to the negative effect of the magnetic medium. Results suggested that the as-prepared magnetic activated carbon possessed a large surface area (around 674 m2 g−1), and exhibited both a high adsorption capacity and a fast adsorption rate for triclosan (TCS) removal. In addition, magnetic activated carbon can be easily recovered from aqueous solutions by an external magnetic field. Overall, the waste rice straw-derived hydrochar can be transformed to a highly efficient magnetic adsorbent for TCS removal.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Materials Today Sustainability
·
2025
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IF 7.9
Xinyuan Dong,Peng Xu,Lihua Gao,Xiao Han,Junhong Zhang,Zhijun He
An environmentally friendly and low-cost co-carbonization technology has been reported as an effective route for the preparation of carbon-based synfuel for sintering processes employed in the steel industry, in which loaded CaO catalysts promote the synergistic role between sawdust (SD) and bituminous coal (BC). In this work, a series of experiments were conducted to research the effects of the co-carbonization temperature, co-carbonization holding time and addition amount of CaO on synfuel. Finally, a co-carbonization temperature of 550 °C, a co-carbonization holding time of 30 min, and the added amount of CaO at 4 wt% were reasonable preparation conditions based on the biomass/coal of 4/6. According to the above experimental parameters, the solids yield, bulk density and heat value of SD/BC synfuel were 61.07%, 403 kg m −3 and 27.82 MJ kg −1 , respectively. These results showed that adding CaO increases the order and density of synfuel microcrystals. For the surface structure, the addition of CaO could improve the content of aromatic C C and C–O, whereas the content of carbonyl C O decreased in the carbonization process, which demonstrated that the addition of CaO could improve transformation of the graphite-like structure. Additionally, SD/BC synfuel loaded with CaO exhibited a rougher surface and larger pores compared to that without CaO loading, and the number of pores decreased because the formation of CaCO 3 coated the synfuel surface. The above indicators of carbon-based synfuel obtained from this study agree with the practical requirements of sintering operations. This work reveals the mechanism of biomass/coal and CaO interaction on the preparation of carbon-based synfuel.
研究领域:
能源科学
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环境科学
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DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2020
·Vol. 17
·期 3
·1075
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IF 2.849
Jinpeng Wang,Ming Zhang
In this paper, biochar (BC) was prepared from discarded grapefruit peel and modified to prepare magnetic biochar (MBC). Physical and chemical properties of BC and MBC were characterized, and the results showed that the type of iron oxide loaded by MBC was γ-Fe2O3. Compared with BC, MBC has a larger specific surface area and pore volume, with more oxygen-containing functional groups on the surface. BC and MBC were used to adsorb and remove endocrine-disrupting chemical (EDC) bisphenol A (BPA) from simulated wastewater. The results showed that the adsorption kinetics and adsorption isotherm of BPA adsorption by BC and MBC were mainly in accordance with the pseudo-second-order kinetics model and the Langmuir model. This indicates that the adsorption of BPA on BC and MBC is mainly a chemically controlled monolayer adsorption. Adsorption thermodynamics show that BC and MBC adsorption of BPA is a spontaneous exothermic reaction, and lowering the temperature is conducive to the adsorption reaction. The effect of solution pH on the adsorption of BPA by both was significant. The optimum pH for BC and MBC to absorb BPA was 6 and 3, respectively. The concentration of Na+in the range of 0–0.10 mol·L−1can promote the adsorption of BPA to MBC. MBC loaded with γ-Fe2O3not only has excellent magnetic separation ability, but can also reach about 80% of the initial adsorption capacity after four cycles of adsorption. By analyzing the adsorption mechanism, it was found that the H-bond and the π–π electron donor–acceptor interaction (EDA) were the main forces for BC and MBC to adsorb BPA.Keywords:biochar;magnetic biochar;adsorption;bisphenol A;γ-Fe2O3
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Zahra Essa Khan,Mengjiao Fan,Yuchen Jiang,Shu Zhang,Murtaza Khan,Qurshia Choudhry,Muhammad Rashid,Zanib Anwar,Sobia Kousar,Xun Hu
Herein, hydrothermal carbonization treatment of shrimp shells or together with glucose at 200 ºC plus subsequent activation with K 2 C 2 O 4 at 800 ºC was conducted, aiming to understand the retainment of organics and development of pore structures of resulting activated carbon. The results indicated that the organics in shrimp shells were highly unstable and the activation formed activated carbon with a mass yield of 5.6 %. Hydrothermal carbonization resulted in the leaching of some organics but promoted the aromatization of others, which in overall enhanced the resistivity of remaining organics towards cracking in activation, increasing the yield of activated carbon to 10.3 %. However, the leaching of a significant portion of aliphatic organics also decreased the specific surface area to 1128.1 m 2 /g (1593.2 m 2 /g from direct activation of shrimp shells. The co-hydrothermal carbonization of shrimp shells with glucose further increased activated carbon yield and enhanced the specific surface area of the activated carbon (1326.6 m 2 /g), due to additional aliphatic organics formed. Additionally, direct activation of shrimp shells formed activated carbon with dominant micropores (89.6 %), while hydrothermal carbonization of shrimp shells plus activation formed mainly mesopores (71.7 %). The presence of glucose in co-hydrothermal carbonization not only rendered micropores to dominate (80.3 %) but also retained appreciable amount of mesopores, forming activated carbon of superior capacity for the adsorption of methylene blue. Leaching of organics via the hydrothermal carbonization, promoted the formation of mesopores/macropores while suppressed the generation of micropores. Additionally, hydrothermal carbonization treatment resulted in wrapping of SiO 2 with organics, deterring further removal of SiO 2 via solid phase reactions with K 2 C 2 O 4 .
研究领域:
生物医学工程
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环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2018
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IF 5.651
Hao Zheng,Xia Liu,Guocheng Liu,Xianxiang Luo,Fengmin Li,Zhenyu Wang
Biochar (BC) and activated carbon (AC) amendments have been applied to remediate contaminated sediments because of their benefits in reducing toxicity and/or the bioavailability of contaminants. However, their ecotoxicity to benthic organisms, which are not well understood, should be carefully considered before their practical application. Therefore, a wood-derived BC (WBC) or a coconut shell-derived AC (CAC) was incorporated into a marine sediment at 5% (dw%) to investigate their effects on the growth and nutritional quality of a marine clam ( Meretrix meretrix ). CAC and WBC had no effect on the pH and calcium content of the sediment, but significantly increased the electrical conductivity (EC) and total organic carbon (TOC), and decreased the dissolved organic carbon (DOC). After 28 days of cultivation, WBC reduced the shell growth of the clam by 36.4%, and CAC reduced the soft tissues of the clam by 9.05%. This was probably because WBC and CAC adsorb organic matters and the feeding algae may colonize within their pores, thus, reducing food bioavailability for the clams. Water extracts of CAC and WBC had negligible effects on soft tissue growth, whereas the CAC extract inhibited the growth of clam shells by 57.9%. WBC and CAC had little influence on the nutritional quality of clams, including moisture, crude protein , and crude lipid contents. These findings are helpful to understand the ecotoxicological risks of BC and AC amendments to benthic organisms when used for the remediation of contaminated marine sediments.
研究领域:
环境科学
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海洋生物学
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DOI
高影响因子
危险品化学品经营许可证（带存储）