TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Xue Wang,Congcong Ma,Guangbin Yang,Shengmao Zhang,Yujuan Zhang,Zhengquan Jiang,Laigui Yu,Pingyu Zhang
In recent years, with the increase in energy demand and gradual scarcity of medium and shallow oil and gas resources, oil and gas exploration has shifted to special wells such as deep wells, ultra-deep wells, and extended reach wells. These complex wellbore structures inevitably increase the torque and friction between the casing and the drill pipe during drilling, which aggravates friction and wear, and leads to accidents such as drill sticking and drill breakage in severe cases. In this study, molybdenum disulfide/bentonite (MoS 2 /Bent) nanohybrids as drilling fluid lubricant were synthesized by hydrothermal method using sodium molybdate (Na 2 MoO 4 ) and thiourea (CH 4 N 2 S) as raw materials and bentonite as carrier. The as-synthesized MoS 2 /Bent nanohybrid was characterized by X-ray powder diffractometer, transmission electron microscopy, Fourier transform infrared spectroscopy, and the high temperature resistance and tribological properties of MoS 2 /Bent nanohybrid were evaluated in base slurry. The results show that the friction coefficient of MoS 2 /Bent nanohybrid drilling fluid before aging is reduced by 74 % and the wear rate is reduced by 97 % compared with the base slurry. After high-temperature aging at 240 °C, the friction coefficient is reduced by 77 % and the wear rate is reduced by 90 %. The excellent friction reducing and antiwear performance is attributed to the formation of low shear strength MoS 2 deposition film and oxide tribofilm on the surface of the friction pair during the rubbing process.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2025
·
IF 8
Shuteng Diao,Wenqing Ma,Yiping Wang,Xuhui Zhao,Fazhi Zhang,Xiaodong Lei
Improving saline-alkali soil requires cost-efficient and stable technologies. In this study, a novel technology combining in-situ super-stable mineralization with Ca-bentonite was successfully applied to ameliorate saline-alkali soil. A simulation experiment was conducted on Ca-bentonite in solution to validate its feasibility, and in-situ mineralization using humic acid, Fe(NO 3 ) 3 ·9H 2 O, and Ca-bentonite was performed to treat saline-alkali soil. Additionally, climate modeling and field experiments were employed to investigate the effects of this technology on soil physicochemical properties, crop growth, and crop yield. Under natural conditions, Ca-bentonite can transform into Na-bentonite via cation exchange with Na + . The results from the in-situ mineralization experiment showed that the soil pH, total content of CO 3 2− and HCO 3 − , Na + content, electrical conductivity, and bulk density decreased from approximately 10.30 to below 9.00, 7.81 to 1.53 g/kg, 7.20 to 1.51 g/kg, 2741 to 552 μS/cm, and 1.63 to 1.24 g/cm 3 , respectively. Furthermore, the germination rate of corn increased from 0 % to 83.3 % in climate simulation experiments. Field trials conducted in Inner Mongolia and Jilin, China, further demonstrated significant improvements in soil properties. The seedling emergence rates for corn and oats significantly increased, rising from 0 % to over 85 % and 95 %, respectively. Correspondingly, crop yields reached 323 kg/hm 2 for corn and 182 kg/hm 2 for oats. Together, our study introduces a novel, cost-effective, and efficient technology to enhance crop growth by mitigating soil salinity and alkalinity. This approach provides a new perspective for alleviating salt-alkali stress and contributes to the advancement of healthy and sustainable agricultural practices.
研究领域:
土壤学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2025
·Vol. 47
·期 6
·1-16
·
IF 3.8
Wu Jiawei,Chen Yun,Xie Haijian,Bouazza Abdelmalek,Yan Huaxiang
The high concentration of fulvic acid (FA) derived from natural matter in landfill leachates has generated increasing interest, as it plays a significant role in influencing the mobility of potentially toxic elements in landfill groundwater environments. This study examines the adsorption and transport behavior of FA on landfill unmodified and modified loess soil liners, analyzing key factors (initial concentration, organ-bentonite content, reaction time, and soil–water ratio) using a Box–Behnken design-based Response Surface Methodology (RSM-BBD). Additionally, the research objective includes evaluating the adsorption of lead (Pb 2 ⁺), providing a comprehensive assessment of the soil liners' performance against both organic and inorganic contaminants. RSM-BBD analysis showed that the higher the hexadecyltrimethylammonium chloride-modified bentonite (HTMAC-B) content, the larger the adsorption capacity of the mixed soil for FA, which proved that FA was mainly adsorbed on the HTMAC-B. Loess + HTMAC-B exhibited the highest capacity, which can be 30.6 times that of loess. The presence of Pb 2+ notably enhanced the adsorption capacity of FA on the loess with HTMAC-B mixture. However, the increase in HTMAC-B content resulted in a decrease in the equilibrium adsorption of FA in the FA-Pb 2+ dual-contaminant system, mainly due to the reduction of adsorbed COO-Pb + and (COO) 2 -Pb complexes. When the HTMAC-B content reached 20%, the breakthrough time of Pb 2+ in the modified liner was shortened by 82%. The use of 5% content of HTMAC-B was identified as appropriate to achieve excellent retardation performance for multi-component pollutants such as organics, organic acids and potentially toxic elements. These insights contribute to understanding how geochemical mitigation of humic substances affects the mobility of potentially toxic elements, and from an engineering perspective, the alternative materials presented in this study may facilitate the construction of thinner liners that meet system requirements while exhibiting excellent adsorption performance for multi-component contaminants.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Jinbei Yang,Bin Huang,Maozi Lin
In this work, the chitosan/bentonite composite was favorably prepared and further used for Cr(VI) removal from aqueous solutions via a batch adsorption process. The characteristics of the chitosan/bentonite composite were determined by using scanning electron microscopy, Brunner–Emmet–Teller measurement, Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction, and the results reveal the evidence of the interaction between functional groups of chitosan with bentonite, which is helpful for the adsorption of Cr(VI). The adsorption performance of the chitosan/bentonite composite is better than that of chitosan or bentonite, and the effects of adsorbent dosage, shaking speed, pH, and temperature were investigated. The results indicate that the percentage removal of Cr(VI) increases with an increase in adsorbent dosage, the external diffusion resistance is maintained constant when the shaking speed exceeds 210 rpm, and the optimum pH is 3. The isotherm and kinetic experimental data of Cr(VI) adsorption onto the chitosan/bentonite composite were best-fitted by Redlich–Peterson and Elovich models, respectively. The adsorption process is an exothermic and of the multilayer variety. The desorption rates of Cr(VI) can be achieved at 60.1% with 0.1 M NaOH. The analysis FT-IR of adsorbents before and after adsorption, adsorption thermodynamics and kinetics, and desorption experiment reveal that the adsorption of Cr(VI) on the chitosan/bentonite composite is predominantly a chemical interaction. The above results suggested that the chitosan/bentonite composite can be employed as a cost-effective and environmentally friendly adsorbent for Cr(VI) removal from wastewater.
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
ADVANCED POWDER TECHNOLOGY
·
2018
·
IF 2.943
Wenjing Xu,Yizhen Chen,Wensheng Zhang,Baojun Li
The graphene oxide/bentonite (BG) composites are prepared through graphene oxide (GO) nanosheets successfully intercalated into acid-treated bentonite interlayer and deposited onto external surface. The BG composites exhibit a higher uptake capacity of toluidine blue (TB) dye from water solutions than normal bentonite owing to the synergistic effect between bentonite and GO. The as-prepared composites are characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and N 2 -sorption analysis. The process parameters affecting the adsorption behaviors such as initial pH, temperature, contact time and initial concentration of dye are systematically investigated. The Langmuir isotherm model fit well with the equilibrium adsorption isotherm data and the maximum adsorption capacity is 458.7 mg·g −1 at pH 8 for BG composites modified using 1% GO. The pseudo-second-order kinetic model well describes the adsorption process of TB onto BG composites. The TB adsorption on BG composites is mainly attributed to ion exchange, electrostatic interaction and intermolecular interactions. The outstanding adsorption performances of composites for the removal of TB dye from water demonstrate its significant potential for environmental applications.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 16
·48577
·
IF 2.188
Xianyou Wu,Chao fu,Zhongyang Tan,Yixing Gao,Antong Ma,Wei Nie,Xianghai Ran
In this work, we fabricated a triple-shape memory polymeric composite (TSMPc) by electron beam irradiation of ε-polycaprolactone (ε-PCL)/poly(butylene adipate- co -terephthalate) (PBAT)/bentonite(50/50/4) (wt %). The 95 ± 5 kGy was confirmed to be the saturated irradiation dose by both high-temperature storage modulus and the equilibrated relaxation modulus at nonlinear elastic region. Further results demonstrated that sample exposed to 41.4 kGy exhibited excellent triple-shape memory effect (TSME) though there existed slight plastic flow in PBAT. The two fixity ratios and total recovery ratio can be as high as 99.9, 98.3, and 94.7%. Besides, the strength of irradiated PBAT was improved because of the synergistic mechanical coupling effect from PCL and bentonite. In the meantime, this synergistic effect also improved the integral TSME and the stability of all shapes. Eventually, we made a comparison among the controllable factors, the crosslinking density and amount of deformation Δε B → C were believed to have more influences on the stability of temporary shapes and the recovery behavior during the shape memory cycle “ A → B → C → B r → A r .” © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48577.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2015
·
IF 2.467
Jinming Hua
Four modifiers, amorphous iron (hydr)oxides (Fe x (OH) y ), manganese oxides (Mn x O y ) and cationic surfactants , cetyltrimethylammonium bromide (CTMAB), and poly(dimethyldiallylammonium chloride) (PDMDAAC), were used to synthesize single and complex modified bentonite . Arsenic removal by modified bentonite was investigated through effects of the type, combination and adding level of modifiers. X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and N 2 adsorption-desorption were used to explore the characteristics of the original and modified bentonite. It was found that the type, combination and adding amount of modifiers would have a noticeable influence on the structure and adsorption behavior of resulting bentonite adsorbents. The complex modified bentonite, with manganese oxides and then PDMDAAC at proper addition level, showed the best adsorption properties for arsenic, which could be due to a synergistic effect between PDMDAAC and manganese oxides during modification process. PDMDAAC was found to be favorable for coating of manganese oxides onto bentonite. The adsorbing capacity of modified bentonite depended not only on specific surface area ( SSA ), but mainly on composite components and/or their specific surface properties.
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 RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 316
·期 1
·71-80
·
IF 1.181
Chen Huai,Chen Quan Shui,Huang Bin,Wang Shi Wei,Wang Ling Yu
In this work, a brand new organic superficial active sorbent l -Cysteine hydrochloride modified bentonite (LCMB) has been developed and proposed for treatment of contaminated water containing uranium. Correlation between different factors such as pH, contact time, temperature, initial concentration of U(VI) and efficiency of LCMB for uranium absorption are discussed. At uranium content in water from 25 to 250 mg L −1 , the sorption capacity for LCMB reached 208.3 mg g −1 that is essentially higher in comparison with other sorbents and notably improved from 77 mg g −1 after modification.
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
Crystals
·
2022
·Vol. 12
·期 2
·257
·
IF 2.67
Jiangfeng Wang,Mengting Chen,Xiaohui Li,Xuexuan Yin,Wenlong Zheng
High temperature would dramatically worsen rheological behaviors and increase filtration loss volumes of drilling fluids. Synthetic polymers with high temperature stability have attracted more and more attention. In this paper, a novel quadripolymer was synthesized using 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylamide (AM), sodium styrene sulfonate (SSS), and dimethyl diallyl ammonium chloride (DMDAAC). Firstly, the molecular structure was studied by Fourier transform–infrared spectroscope (FT-IR) and nuclear magnetic resonance (1H-NMR) analysis. It was shown that the synthetic polymer contained all the designed functional groups. Moreover, the effect of temperature and the quadripolymer concentration on the rheological behavior and filtration loss of the bentonite-free drilling fluid were investigated. It was experimentally established that when the adding amount of the quadripolymer was 0.9 wt%, the prepared drilling fluid systems exhibited relatively stable viscosities, and the filtration losses could be controlled effectively after hot rolling aged within 180 °C. Further, it was confirmed that the bentonite-free drilling fluid containing the synthesized quadripolymer had good reservoir protection performance. In conclusion, the synthetic quadripolymer is a promising rheology modifier and a filtrate reducer for the development of the bentonite-free drilling fluid at high temperature.Keywords:synthetic polymer;high temperature;bentonite-free drilling fluid;rheology;filtration
研究领域:
石油工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Rui Tang,Shiqi Xu,Ya Hu,Junhui Wang,Caimei Lu,Linxing Wang,Zhou Zhou,Dankui Liao,Hanbing Zhang,Zhangfa Tong
Discharge of oily wastewater have caused serious environmental pollution and resources waste. Due to the characteristics of hydrophobic and porous, aerogel has been proved to be a kind of promising oil-adsorbing materials for oil adsorption and recovery. However, dissatisfactory adsorption properties and recovery ability of aerogel for oil pollution treatment were still critical issues hindering aerogel applications. Magnetic exfoliated bentonite (MBTex) possesses good magnetic separation property, anti-mold ability and anti-extruding strength. Meanwhile, Polyethyleneimine (PEI) can cross-link with nano-cellulose to form sponge-like structure and prevent the corrosion of magnetic media. Basing on the above-mentioned characteristics of MB and PEI, a new carboxy cellulose nanofibers/polyethyleneimine/magnetic exfoliated bentonite (CNF-C/PEI/MBTex) aerogel was synthesized using simple hydrothermal and chemical vapor deposition (CVD) methods, and the adsorption and recovery ability of different oil on samples were investigated. The results showed that CNF-C/PEI/MBTex aerogel exhibited superhydrophobic properties (contact angle 151°), excellent mechanical properties (full recovery at 80% pressure), anti-mold properties (the anti-mold efficiency was more than 90%) and magnetic responsivity. Furthermore, CNF-C/PEI/MBTex aerogel exhibited high oil adsorption capacity (24.6 ∼ 77.8 times higher than its original weight) and can recover the adsorbed oil by simple hand squeezing (the adsorption capacity still exceeds 90% after 20 cycles). In summary, the present work provides a valuable reference for the synthesis of high-performance adsorbent materials for oil–water separation using cost-effective clays combined with polymers.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 33
·期 1
·177-190
·
IF 7.2
Dong Yinrui,Yang Yongbin,Wang Lin,Duan Qianqian,Li Qian,Zhang Yan,Jiang Tao
Bentonite is a necessary binder in producing pellets. Its excessive use reduces the iron grade of pellets and increases production costs. Minimizing bentonite dosage is essential for producing high-quality iron ore pellets. Addressing the gap in the application of organically-intercalated modified bentonite in the pelletizing field, this study introduces an innovative modification process for bentonite that employs the synergistic effect of mechanical force and dimethyl sulfoxide to enhance the intercalation of organic compounds within bentonite, thus significantly enhancing its binding performance. The colloid value and swell capacity of modified bentonite (98.5 mL/3g and 55.0 mL/g) were much higher than the original bentonite (90.5 mL/3g and 17.5 mL/g). With the decrease of bentonite dosage from 1.5wt% to 1.0wt%, the drop number of green pellets from a height of 0.5 m and the compressive strengths of roasted pellets using the modified bentonite (6.0 times and 2916 N per pellet) were significantly higher than those of the original bentonite (4.0 times and 2739 N per pellet). This study provides a comprehensive analysis of the intercalation modification mechanism of bentonite, offering crucial technical insights for the development of high-performance modified bentonite as iron ore pellet binders.
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Junzhi Yu,Zhansheng Wu,Xiongfang An,Fei Tian,Bing Yu
The stability of biochar is a crucial parameter in determining the potential of biochar for carbon sequestration . Many studies have demonstrated that the addition of clay during the pyrolysis of biomass is beneficial for the production of biochar with a high stability, but finding a strategy for a further improvement of stability of clay-modified biochar is still highly desirable. Herein, the co-pyrolysis of biomass and clay mediated by trace metal elements is proposed as a new strategy for the production of biochar with exceptionally high stability. The results indicate that the biochar resistance index for biochar obtained from the trace metal elements mediated the co-pyrolysis of biomass and clay is ~0.75, which is much higher than that of biochars obtained from biomass pyrolysis or the co-pyrolysis of biomass and clay, demonstrating that the presence of metal ions during the co-pyrolytic process can significantly improve the oxidation resistance of biochar. Thermogravimetric analysis reveals that the carbon retention value is reduced when the addition of metal ions during the co-pyrolytic process, and the presence of metal ions can reduce the starting temperature of the pyrolysis reaction and catalyze the process of biomass pyrolysis. In addition, the percentages of C C, C C, and C H in all biochars obtained from trace metal elements mediated the co-pyrolysis of biomass and clay are greater than 41.82%, which are higher than that of original biochar. Besides, the percentage of oxygen-containing functional groups is found to be decreased after the presence of metal ions during the co-pyrolytic process. The presence of metal ions can form metal nano-sulfides and oxides on the surface, which plays a physical barrier to the anti-oxidation performance of biochar. Furthermore, compared to BBC or BC, MnBBC and ZnBBC have a better leaching resistance to P, while FeBBC has almost no leaching resistance to soil P. Overall, the study reveals that the addition of trace element metal ions during the co-prolysis of biomass and bentonite is an effective method to increase the stability of obtained biochar, and it is also beneficial for retarding the release of nutrients in the soil and thus increase the utilization of nutrients.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）