Sustainability
·
2023
·Vol. 15
·期 15
·11867
·
IF 3.9
Na Chai,Lihui Gao,Shulei Li,Zilong Ma,Lingni Li,Ming Hu
Modified persimmon peel–montmorillonite composites (PMHC-KOH/NaHCO3) for efficient and rapid removal of methylene blue (MB) were synthesized using hydrothermal carbonization and simple alkali impregnation. The surface properties and material compositions of the hydrochars were determined with SEM, zeta potential, and XRD, and the adsorption mechanism of MB on two modified hydrochars was analyzed with FTIR, XPS, and DFT calculation. The results showed that modified hydrochars with a rough surface structure and rich oxygen-containing groups exhibited a strong affinity for MB, and the adsorption capacity of PMHC-NaHCO3and PMHC-KOH for MB reached 121.28 mg/g and 278.41 mg/g, respectively, with PMHC-KOH achieving more rapid adsorption of MB, at a rate of 0.043 g/mg/min. After five adsorption/desorption cycles, the two modified hydrochars still maintained a high adsorption rate of MB (92.32%/98.43%). The excellent adsorption performance of the modified hydrochars was attributed to hydrogen bonding, π-π interaction, electrostatic attraction, and ion exchange. DFT calculations revealed that oxygen-containing groups of the modified hydrochars played an important role in the adsorption of MB and confirmed that electrostatic attraction, hydrogen bonding, and π-π interactions were the key forces for rapid and efficient adsorption of MB. The prepared adsorbents gave full play to the regenerative applicability of agricultural waste, the simple alkali impregnation method eliminated the need for the additional cost of pyrolysis and activation, and their application in MB adsorption realized the treatment of waste with waste.Keywords:alkali-modified hydrochar;methylene blue;oxygen-containing functional groups;adsorption
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL QUALITY
·
2019
·Vol. 48
·期 2
·502-509
·
IF 2.579
Ying-heng Fei,Dan Zhao,Yadong Cao,Hermine Huot,Ye-tao Tang,Hongguo Zhang,Tangfu Xiao
To solve both the problems of P deficiency in arable soil and excessive waste sludge disposal, we evaluated hydrothermal carbonization of sludge with the aim of recycling sludge P resources for soil amendment. In contrast with pyrochars obtained through pyrolysis, hydrochars generated from hydrothermal carbonization often feature variable properties and therefore require detailed characterization. In this study, sludge-derived hydrochars were evaluated to determine their P content and fractionation, release and availability of P, and P adsorption and desorption behavior. We also assessed changes in P availability after soil was amended with the hydrochars. Our results showed that the chars were rich in total P (up to 25,175 mg kg −1 ), but most of the free fractions were transformed to bound fractions, thereby reducing the available P concentrations. However, available P content was >417 mg kg −1 , which was far higher than soil demand. The hydrochars shifted from releasing to adsorbing P adsorbent when the environmental P concentration increased above 20 mg L −1 . The hydrochars showed a high phosphate adsorption capacity (up to 23,815 mg kg −1 ) and the adsorbed P could be readily released. The addition of 1% P-laden hydrochar significantly enhanced the soil available P content by 8.93 mg kg −1 . These findings have important implications for further development of hydrochar-based P carriers as a slow-releasing fertilizer. Core Ideas Charring transformed P from readily available fractions to moderately available ones. Sludge-derived hydrochars showed the best performance in long-term P release. Sludge-derived hydrochars had better P retention capacity than their feedstock. Applying the sludge-derived hydrochar improved the available P content of soil.
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
Qingnan Chu,Sheng Xu,Lihong Xue,Yang Liu,Yanfang Feng,Shan Yu,Linzhang Yang,Baoshan Xing
Clay-hydrochar composites (CHCs) are of great significance in ammonium (NH 4 + ) adsorption and have the potential to be applied to paddy fields to prevent ammonia (NH 3 ) volatilization. In this study, three CHCs were produced by infusing different clays to poplar-sawdust-derived hydrochar , including a bentonite hydrochar composite (BTHC), montmorillonite hydrochar composite (MTHC), and kaolinite hydrochar composite (KTHC). These three CHCs were applied to a paddy soil column system growing rice. The temporal variations in NH 3 volatilization and NH 4 + loss in floodwater were monitored after three fertilization dates. The results showed that among the three CHCs, only the BTHC significantly reduced cumulative NH 3 volatilization (by 41.8%), compared to that of the unamended control (without addition of hydrochar or clay-hydrochar-composite). In the unamended control, NH 3 volatilization loss accounted for 31.4% of the applied N fertilizer; with the BTHC amendment, NH 3 volatilization loss accounted for 17.4% of the applied N fertilizer. The reduced N loss via the BTHC amendment resulted in an increased N supply and further improved the N use efficiency and yield by 37.36% and 18.8% compared to that of the control, respectively. The inhibited NH 3 volatilization was mainly attributed to the increased soil NH 4 + retention as a result of BTHC's larger pore volume and specific surface area. In addition, the BTHC treatment significantly reduced the abundance of archaeal amoA genes ( AOA ), which possibly inhibited nitrification and increased soil NH 4 + retention. This study, for the first time, screened BTHC as an excellent material for mitigating NH 3 volatilization from paddy fields. The reduced NH 3 volatilization loss might contribute to increased soil N retention and plant N use efficiency.
研究领域:
农业科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yaozu Mi,Shuo Zhang,Haohao Yan,Genji Yang,Hua Yang,Yang Zhou,Lei Miao,Xinyan Gao,Yaqi Hong,Hailian Zang,Chunyan Li
In this study, we utilized typical Chinese medicine herbal residues (CMHRs)－Scutellaria baicalensis ( Scutellaria baicalensis Georgi) residue (SR), as the raw material and employed Na 2 SiO 3 and Fe 2 (SO 4 ) 3 as modifying agents to fabricate a novel and multifunctional hydrochar (FeSi-SRHC), which was designed for comprehensive removal of typical contaminants such as Cu 2+ , Zn 2+ , tetracycline (TC), and ciprofloxacin (CIP), along with relevant bio-contaminants (resistant bacteria (RBs) and resistance genes (RGs)) present in wastewater. Based on the analysis of adsorption kinetics and Freundlich isotherm, it was found that FeSi-SRHC exhibited physical monolayer adsorption for Cu 2+ /Zn 2+ while mainly chemical multilayer adsorption for TC/CIP in single-contamination system. Furthermore, Langmuir isotherm demonstrated excellent adsorption capacity of FeSi-SRHC towards Cu 2+ /Zn 2+ /TC/CIP with maximum capacities of 255.75, 265.26, 425.53, and 404.86 mg/g, respectively. In the co-contamination system, the presence of Cu 2+ , Zn 2+ , TC, and CIP exhibited varying degrees of inhibitory or promotive effects on the mutual adsorption by FeSi-SRHC. This divergence stemmed from differences in complexation intensities and concentration ratios among diverse co-existing contaminants. Based on XPS and Density Functional Theory (DFT) analyses, the adsorption process for Cu 2+ , Zn 2+ , TC, and CIP by FeSi-SRHC primarily involves pore fill, complexation reactions, ion exchange, hydrogen bonding, π-π stacking interactions, and electrostatic interactions. Bio-contaminant removal experiments revealed that the release of baicalin and wogonoside from FeSi-SRHC disrupts the structure of RBs cells and compromises the integrity of resistance plasmids. The practical application experiment showed that FeSi-SRHC displayed favorable performance for removing heavy metals, antibiotics, and bio-contaminants in actual wastewater. This study presented a “Treating waste with waste” strategy, which provided a method with low carbon, eco-friendly, and inexpensive for CMHRs resources and turning waste into treasure while proposing a idea to address the challenges associated with treating heavy metal, antibiotic, and bio-contaminant contamination in wastewater.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Jianhua Qu,Yang Liu,Jiao Meng,Fuxuan Bi,Shouyi Ma,Guangshan Zhang,Yifan Wang,Yue Tao,Zhao Jiang,Ying Zhang
Herein, magnetic porous pinecone-derived hydrochar (MPHC MW ) co-activated by KHCO 3 and K 2 FeO 4 through one-step microwave-assisted pyrolysis was innovatively synthesized for hexavalent chromium (Cr(VI)) and anthracene (ANT) removal from water. The analyses of characterization consequences and co-activation mechanisms not merely proved the high specific surface area (703.97 m 2 /g) and remarkable microporous structures of MPHC MW caused by the synergistic chemical activation of KHCO 3 and K 2 FeO 4 , but also testified successful loading of Fe 0 and Fe 3 O 4 on MPHC MW by the process of carbothermal reduction between K 2 FeO 4 and carbon matrix of hydrochar. The resultant MPHC MW possessed pH-dependence for Cr(VI), while adsorption for ANT was hardly impacted by the pH of solution. Moreover, the adsorption processes of MPHC MW could attain equilibrium within 60 min for Cr(VI) and 30 min for ANT with multiple kinetics, and the corresponding adsorption capacity for Cr(VI) and ANT was 128.15 and 60.70 mg/g, respectively. Additionally, the adsorption percentages of MPBC MW for Cr(VI)/ANT was maintained at 87.87/82.64% after three times of adsorption-desorption cycles. Furthermore, pore filling, complexation, electrostatic interaction, reduction and ion exchange were testified to enhance the removal of Cr(VI), while the ANT removal was achieved via π-π stacking, complexation, pore filling and hydrogen bonding force.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Yu-Nan Zhang,Jian-Zhong Guo,Chunzheng Wu,Wei-Wei Huan,Lin Chen,Bing Li
Chemical modification on hydrochars can significantly improve their ability of removing heavy metal ions from wastewater, but so far no research has focused on the chemical modification through free radical reaction. In this work, a cation functionalized hydrochar (CFHC) bearing − N + H 2 R was synthesized by grafting-polymerization of glycidyl methacrylate (GMA) onto bamboo hydrochar under initiation by benzoyl peroxide, followed by the amination with the introduced epoxy group and diethylenetriamine and a subsequent hydrochloric acid treatment. The resulted CFHC exhibited a superior removal capacity of 424.09 mg·g −1 for Cr(VI), and the highest sorption occurred at pH of 2. Combining a series of characterizations and tests, it was concluded that the sorption conformed to the pseudo-second-order and Freundlich equations, indicating a multilayer chemisorption process that mainly driven by electrostatic reaction, reduction, and surface complexation. This research proved that a free radical polymerization treatment could effectively transform hydrochars into super adsorbents for wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Shaojuan Yan,Jianhua Qu,Fuxuan Bi,Shuqi Wei,Siqi Wang,Zhao Jiang,Lei Wang,Hongwen Yu,Ying Zhang
KOH-activated N -doped hydrochar (KHCN) was synthesized via co-activation method to eliminate atrazine (AT) in water efficiently. Compared to primitive HC, KHCN had advantages of splendid specific surface area (1205.82 m 2 /g) and developed microsphere structures on the surface. Specially for KHCN, the extra melamine added strengthened and preserved partial structure of polar oxygen-containing groups that were decomposed in the process of pore making. Besides, the estimated uptake amount of AT onto KHCN (216.50 mg/g) was remarkably superior to KHC (114.25 mg/g). KHCN exhibited the pH-dependence for AT removal, and presented excellent uptake capacity at a relatively neutral environment. Notably, the proposed mechanisms for AT removal by KHCN included electrostatic attraction, pore filling, π-π EDA, H-bond as well as hydrophilic effect. Hence, the porous N -doped hydrochar was a kind of adsorbent which was easy to prepare and had the application prospect for AT removal in natural water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2020
·
IF 6.793
Yu Xia,Hainan Luo,Dong Li,Zeliang Chen,Shengshu Yang,Zhengang Liu,Tianxue Yang,Chao Gai
A novel amino-functionalized hydrochar material (referred to NH 2 –HCs) was prepared and used as the soil amendment to immobilize multi-contaminated soils for the first time. The results showed that the application of NH 2 –HCs significantly improved (P < 0.05) soil properties (i.e., pH value, cation exchange capacity and organic content). By introduction of NH 2 –HCs, the contaminated soil showed the highest value of 96.2%, 52.2% and 15.5% reductions in Cu, Pb and Cd bioavailable concentrations and the leaching toxicity of Cu, Pb and Cd were remarkably reduced by 98.1%, 31.3% and 30.4%, respectively. Most of exchangeable Cu, Pb and Cd reduced were transformed into its less available forms of oxidizable and residual fractions. Potential ecological risk assessment indicated that the element Cd accounted for the most of total risks in NH 2 –HCs amended soils. The mechanism study indicated that surface complexation, chemical chelating and cation-pi interaction of NH 2 –HCs played a vital role in the immobilization of heavy metals. Pot experiments further verified that the application of NH 2 –HCs significantly improved plant growth and reduced metal accumulations. The present study offered a novel approach to prepare amino-functionalized hydrochars with great potential as the green and alternative amendments for efficiently immobilizing heavy metals in multi-contaminated soil.
研究领域:
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Long Cheng,Yuanhui Ji,Xiaomin Liu
In this experiment, the interfacial interaction mechanism associated with the sorption of methylene blue (MB) and methyl orange (MO) on Fe-doped porous graphite hydrochar (Fe@PGHC) was studied. The characterization results indicated that Fe@PGHC was fabricated successfully and possessed a well-distributed pore size, graphene-like properties and a large surface area (2340 m 2 /g). The sorption results demonstrated that the pseudo-second-order kinetics and Sips isotherm models matched well with the MB/MO uptake behaviour. The results of density functional theory (DFT) calculations revealed that increasing the number of oxygen-containing functional groups improved the sorption capacity of MB and decreased the sorption capacity of MO. MB was regarded as an electron acceptor, MO was regarded as an electron donor, and the interaction between adsorbent and MB/MO included π-π, electrostatic and hydrogen bond interactions. The above results demonstrated that Fe@PGHC was a green and promising adsorbent for the sorption of organic dyes from aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yingyi Li,Shangui Zhang,Yanan Qin,Congcong Yao,Qingda An,Zuoyi Xiao,Shangru Zhai
Strategy exploration for tailored conversing bio-wastes into valuable functional matrices with varied potentiality is a hotspot in the field of environmental remediation and green chemistry. As is known, the direct combustion of rice hulls has led to serious atmospheric pollution. Accordingly, how to controllably convert rice hulls into catalytic functional materials for water remediation is highly demanded yet remains a great improvement. Herein, low-cost and environmentally friendly surface-loaded cobalt/ hydrochar composites (Co-RHs) were successfully synthesized by hydrothermal carbonizing cobalt-impregnated rice hull waste. The Co-RH-130 exhibited prominent performance in efficiently activating peroxymonosulfate (PMS) to degrade carbamazepine (CBZ), which could remove 95.78% of CBZ within 60 min. Additionally, the Co-RH-130 in recyclability tests maintained high stability and recyclability from the synergy of cobalt oxides and hydrochar, and the inherent mechanically stable of the rice hulls. Based on quenching tests and EPR analysis, SO 4 •− and O 2 •− were proved as the predominant reactive species for the CBZ degradation and the reaction mechanism was elucidated. Most importantly, the degradation experiment of the fixed-bed column was used to simulate the degradation process under actual conditions to evaluate the efficiency and practical application value, which showed that the continuous degradation rate of 97.06% of CBZ could still be reached in the Co-RH-130/PMS system at 720 min. This work might provide a contributing solution for the controllable conversion of rice hull waste and practical treatment for continuous organic wastewater.
研究领域:
环境科学
·
绿色化学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Bing Li,Jian-Zhong Guo,Jia-Lin Liu,Ling Fang,Jian-Quan Lv,Kangle Lv
Hydrochar produced from agricultural and forestry wastes and its application into the environment are very attractive. Herein, a high-efficiency dithiocarbamate-modified hydrochar (DTHC) was prepared successfully and then applied to eliminate Pb(II) from aqueous solutions. DTHC was characterized by various techniques. It was found that dithiocarbamate and amine groups were successfully grafted onto the surface of hydrochar. The surface area of DTHC was 7.94 m 2 ·g −1 , which was four folds less than pristine hydrochar (31.60 m 2 ·g −1 ), but its adsorption capacity obviously increased. Adsorption experiments showed that the Pb(II) adsorption process onto DTHC well accorded with pseudo-2nd-order kinetics and Langmuir isotherms. The highest Pb(II) uptake by DTHC at 293 K determined from the Langmuir model was 151.51 mg·g −1 . Fourier transform infrared spectra and X-ray photoelectron spectroscopy verified that dithiocarbamate, carboxylate , amine and sulfonate groups all facilitated the Pb(II) adsorption. The adsorption mechanism was ascribed to the inner-sphere surface complexation of Pb(II) by these groups and to the ion exchange between Pb(II) and Na(I). Thus, DTHC is an effective adsorbent for Pb(II) removal from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Kangxin Xiao,Huan Liu,Yang Li,Linlin Yi,Xiuju Zhang,Hongyun Hu,Hong Yao
For efficient hydrothermal treatment of biomass, this study aims to figure out the correlations between complex chemical constitution of orange peel (OraPeel) as typical bio-waste and the physicochemical structure of its derived hydrochar , which could be utilized to adjust hydrochar properties for specific applications (e.g., adsorbent, fuel) by regulating respective proportions of each component in bio-waste. Cellulose, hemicellulose and lignin were used as the control variables of feedstocks composition in this work. After hydrothermal process, lignin added feedstock produced more hydrochar, which contained rougher surface with nearly doubled BET areas and more benzene rings. Hemicellulose-aided hydrochar possessed higher density of carbonaceous microspheres and richer hydroxyl. This char was simultaneously covered by more esters or lactones with more aromatic oxygen-containing groups inside. Similar to hemicellulose, cellulose improved the formation of diverse oxygenous groups but reduced the size of microspheres on hydrochar.
研究领域:
环境科学
·
生物质能源
·
环境工程
·
材料化学
·
废物资源化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）