scholarly journals Characterization of three Pb-resistant fungi and their potential Pb2+ ions adsorption capacities

2018 ◽  
Vol 78 (12) ◽  
pp. 2616-2625 ◽  
Author(s):  
Xin Sun ◽  
Fei Han ◽  
Hui Wang ◽  
Fupeng Song ◽  
Xiumin Cui ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
High Performance ◽  
Adsorption Process ◽  
Inhibitory Concentration ◽  
Removal Rate ◽  
Langmuir Equation ◽  
Adsorption Capacities ◽  
Heavy Metal Remediation ◽  
Elovich Equation

Abstract Bioremediation is preferred in heavy metal remediation, and the high-performance microbe is of prime importance. In the present research, three Pb-resistant microbes were isolated and growth characteristics and adsorption capacities were evaluated. The results showed that R. oryzae SD-1, T. asperellum SD-5, and M. irregularis SD-8 can grow well under 100 mg L−1 Pb2+ ions stress. There is a higher minimum inhibitory concentration (MIC) of Pb but lower MICs of Cd and Zn in T. asperellum SD-5. However, there were similar MICs of Cu among the three microbes. R. oryzae SD-1 exhibited a higher adsorption capacity and removal rate relative to the other two microbes under various Pb2+ ion levels. The Langmuir equation was fitted for the adsorption capacity of T. asperellum SD-5 and M. irregularis SD-8, and their maximum adsorption capacities were approximately 456.62 mg g−1 and 93.62 mg g−1. Moreover, the Elovich equation and the double constant equation can describe the adsorption process of Pb2+ ions in Pb-resistant microbes well. The strongest adsorption capacity under lower Pb2+ ion level was observed in M. irregularis SD-8, while the strongest adsorption capacities under higher Pb2+ ion levels were seen in R. oryzae SD-1 and T. asperellum SD-5. Therefore, three novel Pb-resistant microbes may be used as efficient, easily cultivated materials for Pb-contaminated soil remediation.

Adsorption of Cu(II) and Zn(II) Ions by Solidified Landfilled Sludge and its Pyrolyzed Produce

2014 ◽  
Vol 955-959 ◽  
pp. 2629-2634 ◽  
Author(s):  
Wu Yao ◽  
Wei Qin Zhu ◽  
Yin Na Zhan ◽  
Yang Wu
Keyword(s):  
Surface Roughness ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Functional Group ◽  
Adsorption Process ◽  
Langmuir Equation ◽  
Ftir Analysis ◽  
Aromatic Rings ◽  
Adsorption Capacities ◽  
Hydroxy Aldehydes

In this study, using solidified landfilled sludge (SLS) and its pyrolyzed produce (PSLS) as adsorbents, adsorption characteristics of Cu2+and Zn2+onto SLS and PSLS was investigated. These results revealed that PSLS had more irregular pores and its surface roughness increased, and the surface area of PSLS was twice than that of SLS. Adsorption studies showed that adsorption capacity of Cu2+and Zn2+increased with the increasing dosage of adsorbents, and the adsorption process of Cu2+and Zn2+onto SLS or PSLS could be divided into the first rapid step and the second slower step. Based on Langmuir equation, the maximum limiting adsorption capacities of Cu2+and Zn2+onto PSLS was much higher that onto SLS. Moreover, FTIR analysis showed that the adsorption of Cu2+and Zn2+on SLS depended on active functional group such as hydroxy aldehydes while that relied on the groups such as C=C bond of aromatic rings, Si-O-Si or Si-O-C structures for PSLS.

Characterization of Adsorbents Derived from Palm Fiber Waste and its Potential on Methylene Blue Adsorption

2020 ◽  
Vol 841 ◽  
pp. 273-277
Author(s):  
Ariany Zulkania ◽  
Muhammad Iqbal ◽  
Syamsumarlin
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Phosphoric Acid ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Methylene Blue Adsorption ◽  
Palm Fiber ◽  
Methylene Blue Removal ◽  
Phosphoric Acid Concentration

In this study, two types of adsorbent including activated carbon and bio-sorbent were produced from Palm fiber wastes (PFW), which were activated by phosphoric acid. The influence of adsorbent type and phosphoric acid concentration on methylene blue adsorption was investigated. The most optimum adsorbent was determined based on adsorption capacity and removal percentage of each adsorbent. The result shows that 9.984 mg/g of adsorption capacity and 99.84% of removal percentage were achieved in 90 minutes’ adsorption, which demonstrates the huge potential of bio-sorbent and was chosen to be the most optimum adsorbent based on methylene blue removal. The characterization of bio-sorbent was then investigated using FTIR and SEM. FTIR result shows that bio-sorbent contains cellulose which affected the adsorption process while SEM result shows the cleaner pores and surface compared to bio-sorbent before activation.

Study on Adsorption of U(VI) From Aqueous Solution by Activated MgO

2017 ◽  
Author(s):  
Qingqing Liu ◽  
Xiaoyan Li
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Batch System ◽  
15Mg Dose ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of

The activated MgO was synthesized by microwave homo-precipitator method and characterized by SEM, EDS and FT-IR methods. It was used to adsorption of U(VI) from aqueous solution with batch system. The paper discussed the effect of pH, temperature, contact time, adsorbent dose and initial U(VI) concentration on the adsorption. The results showed that activated MgO has good adsorption capacity for U(VI), the removal rate and equilibrium adsorption capacity reached 83.5% and 84.04mg·g−1 at pH 5.0, 15mg dose and 313K,respectively. The adsorption kinetics of U(VI) onto activated MgO were better fitted with pseudo-second-order kinetic.The adsorption isotherm data were fitted well to Freundlich isotherm model.The thermodynamic parameters showed that the adsorption process is endothermic and spontaneous.

scholarly journals Dewatered alum sludge: a potential adsorbent for phosphorus removal

2006 ◽  
Vol 54 (5) ◽  
pp. 207-213 ◽  
Author(s):  
Y. Yang ◽  
D. Tomlinson ◽  
S. Kennedy ◽  
Y.Q . Zhao
Keyword(s):  
Water Treatment ◽  
Adsorption Capacity ◽  
Phosphorus Removal ◽  
Adsorption Process ◽  
Study Groups ◽  
Phosphorus Adsorption ◽  
Langmuir Adsorption ◽  
Adsorption Capacities ◽  
Alum Sludge ◽  
Best Fit

Alum sludge refers to the by-product from the processing of drinking water in water treatment works. In this study, groups of batch experiments were designed to identify the characteristics of dewatered alum sludge for phosphorus adsorption. Air-dried alum sludge (moisture content 10.2%), which was collected from a water treatment works in Dublin, was subjected to artificial P-rich wastewater adsorption tests using KH2PO4 as a model P source. Adsorption behaviours were investigated as a function of amount and particle size of alum sludge, pH of solution and adsorption time. The results have shown that pH plays a major role not only in the adsorption process but also in the adsorption capacity. With regard to adsorption capacity, this study reveals the Langmuir adsorption isotherm being the best fit with experimental data (R2=0.98–0.99). The maximum adsorption capacities range from 0.7 to 3.5 mg-P/g when the pH of the synthetic P solution was varied from 9.0 to 4.3, accordingly. The outcome of this study indicated that alum sludge is suitable for use as an adsorbent for removal of phosphate from wastewater.

Optimization of the Adsorption Process of Bezaktiv Turquoise Blue «VG» Textile Dye onto Diatomite Using the Taguchi Method

2018 ◽  
Vol 762 ◽  
pp. 81-86 ◽  
Author(s):  
Hakim Aguedal ◽  
Abdelkader Iddou ◽  
Janis Locs
Keyword(s):  
Taguchi Method ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Removal Rate ◽  
Textile Dye ◽  
Adsorption Parameters ◽  
Thermal Regeneration ◽  
Factors Affecting ◽  
Relevant Factors

A design of experiments based on the Taguchi method was used to evaluate the main parameters affecting the removal of textile dyes from aqueous solution. By using the adsorption capacity of textile dye as target response, several experiments were carried out using L27 orthogonal array, and the higher-the-better as quality characteristics was applied. The controlling factors, including initial dye concentration, contact time and pH of solution were assessed. Analysis of variance (ANOVA) was used to determine the effects of each factor on the adsorption capacity. The optimum adsorption conditions giving higher adsorption capacity were selected as initial dye concentration of 500 mg.L-1, contact time of 180 min and pH of solution of 2. The analysis results revealed that the most relevant factors affecting the adsorption process of textile dye are the initial dye concentration and pH of solution. After 3 cycles of thermal regeneration, the diatomite behavior did not change and more than 60 % of dye was eliminated from solution after regeneration at 600°C. From the obtained results, the Taguchi method was very successful to optimize of the adsorption parameters for maximum removal rate, and gives more credibility for industrial application.

scholarly journals Removal of triphenylmethane dye from aqueous solutions through an adsorption process over waste materials

2020 ◽  
Vol 10 (4) ◽  
pp. 5772-5779
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Dye Removal ◽  
Functional Group ◽  
Adsorption Process ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Pseudo Second Order ◽  
Best Fit

Water pollution is the most significant issue due to rapid growing industrial development especially textile dye industry. Therefore, the adsorption process experiment was conducted to determine the removal ability of the adsorbent chosen. The removal rate and adsorption capacity of Phenol red and Cresol were analyzed by using eggshell adsorbent in the adsorption process. The experiment was conducted with parameters of initial concentration, dosage, pH and contact time. Results indicated that the removal rate achieved more than 90% and the adsorption capacity exceeded more than 5 mg/g. The functional group before adsorption process eggshell adsorbent and after adsorption process eggshell adsorbent was analyzed by using FTIR (Fourier Transform Infrared Spectroscopy). The study of adsorption isotherm and kinetics model was carried out to identify the efficiency of the eggshell adsorbent reacting with the dye solution. The adsorption isotherm that applied in this research was Langmuir isotherm, Jovanovic isotherm and Freundlich isotherm. Moreover, Pseudo-first-order and Pseudo-second-order chosen were conducted to determine the kinetic studies. In short, eggshell adsorbent is highly effective on dye removal through adsorption capacity. The functional group of the eggshell adsorbent was found such as alcohols, phenol, alkanes, carbonyls, ester, saturated aliphatic, aldehydes, aromatics, 2°amines and phosphorus. For kinetics study, Freundlich isotherm was analyzed as the best fit isotherm model as it achieved the highest R2 value which is closed to 1 and Pseudo-second-order was analyzed as the best fit kinetic model in this experiment. Therefore, eggshell adsorbent is highly effective in dye removal.

Performance of poly(styrene-co-divinylbenzene) functionalized with different aminophosphonate pendant groups, in the removal of phenolic compounds from aqueous solutions

2016 ◽  
Vol 88 (10-11) ◽  
pp. 993-1004 ◽  
Author(s):  
Corneliu-Mircea Davidescu ◽  
Radu Ardelean ◽  
Popa Adriana
Keyword(s):  
Phenolic Compounds ◽  
Aqueous Solutions ◽  
Functional Groups ◽  
Adsorption Process ◽  
Active Centers ◽  
One Pot ◽  
Batch System ◽  
Adsorption Capacities ◽  
The Difference

AbstractIn the present work, we describe the synthesis and characterization of styrene-6.7%-divinylbenzene copolymers functionalized with aminophosphonate groups by “one-pot” reactions. Different aminophosphonate groups were grafted on the copolymer with the aim of obtaining adsorbents for removal of phenolic compounds from aqueous solutions. Adsorption experiments were carried out in batch system. The phenolic compounds studied were phenol and 2,4,6-trimethyl-phenol. The best adsorption capacity was observed in the case of polymeric adsorbents functionalized with aminophosphonate groups in para- position of the aromatic nucleus for both phenol and 2,4,6-trimethyl-phenol. In comparison, the copolymers with the functional groups in ortho- position and respectively in meta- position were slightly less efficient. The differences in adsorption efficiency may be explained taking into account the structure of the adsorption active centers. The possible explanation is that the active functional groups responsible for the adsorption process, grafted in ortho- or meta- position could be affected by possible steric hindrance effects. The difference between the adsorption capacities of the polymers of the same series, are rather small and depending on the nature of the radical found in the structure of the aminophosphonate: isopropylamine or isobuthylamine.

scholarly journals Adsorption of p-Nitrophenol onto PDMDAAC-Modified Bentonites

2005 ◽  
Vol 23 (5) ◽  
pp. 407-416 ◽  
Author(s):  
Xianjia Peng ◽  
Zhaokun Luan ◽  
Hongmei Zhang ◽  
Binghui Tian ◽  
Bin Fan
Keyword(s):  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Interlayer Space ◽  
Removal Rate ◽  
Cost Effective ◽  
Dual Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Adsorption Capacities ◽  
Ph Dependent

A novel organobentonite was prepared by modifying bentonite with poly(dimethyldiallylammonium chloride) (PDMDAAC), a harmless and cost-effective type of polycation. Zeta potential and X-ray diffraction measurements suggest that PDMDAAC was intercalated into the bentonite interlayer space. PDMDAAC—bentonite has been found to be effective for the removal of p-nitrophenol with a removal rate of 81.4% being achieved. The adsorption process was pH-dependent and was slightly decreased by the Ca2+ and Mg2+ ions co-existing in the solution. A dual-phase adsorption mechanism was suggested for the process. The adsorbents obtained from the regeneration of PDMDAAC—bentonite still exhibit good adsorption capacities.

Fabrication of a novel graphene oxide/β-FeOOH composite and its adsorption behavior for copper ions from aqueous solution

2015 ◽  
Vol 44 (22) ◽  
pp. 10448-10456 ◽  
Author(s):  
Tingshun Jiang ◽  
Lu Yan ◽  
Lei Zhang ◽  
Yingying Li ◽  
Qian Zhao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Copper Ions ◽  
Removal Rate ◽  
Second Order ◽  
Adsorption Behavior ◽  
Kinetics Model ◽  
Pseudo Second Order

A graphene oxide/β-FeOOH composite was prepared and its adsorption capacity was evaluated by Cu2+removal. The adsorption process was well fitted with the pseudo-second-order kinetics model. The removal rate of Cu2+reached 93.8%.

scholarly journals Phosphorus and Nitrogen Adsorption Capacities of Biochars Derived from Feedstocks at Different Pyrolysis Temperatures

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1559 ◽  
Author(s):  
Lei Zhou ◽  
Defu Xu ◽  
Yingxue Li ◽  
Qianchen Pan ◽  
Jiajun Wang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Process ◽  
Pyrolysis Temperature ◽  
Nitrogen Adsorption ◽  
P Adsorption ◽  
Adsorption Capacities ◽  
Plant Waste ◽  
Endothermic Reactions ◽  
Egg Shell ◽  
Feedstock Material

This study investigates the P and NO3− adsorption capacities of different biochars made from plant waste including rice straw (RSB), Phragmites communis (PCB), sawdust (SDB), and egg shell (ESB) exposed to a range of pyrolysis temperatures (300, 500 and 700 °C). Results indicate that the effect of pyrolysis temperature on the physiochemical properties of biochar varied with feedstock material. Biochars derived from plant waste had limited adsorption or even released P and NO3−, but adsorption of P capacity could be improved by adjusting pyrolysis temperature. The maximum adsorption of P on RSB700, PCB300, and SDB300, produced at pyrolysis temperature of 700, 300 and 300 °C, was 5.41, 7.75 and 3.86 mg g−1, respectively. ESB can absorb both P and NO3−, and its adsorption capacity increased with an increase in pyrolysis temperature. The maximum NO3− and P adsorption for ESB700 was 1.43 and 6.08 mg g−1, respectively. The less negative charge and higher surface area of ESB enabled higher NO3− and P adsorption capacity. The P adsorption process on RSB, PCB, SDB and ESB, and the NO3− adsorption process on ESB were endothermic reactions. However, the NO3− adsorption process on RSB, PCB and SDB was exothermic. The study demonstrates that the use of egg shell biochar may be an effective way to remove, through adsorption, P and NO3− from wastewater.

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