scholarly journals Biosorption of zinc from aqueous solution using algae and plant biomass

2021 ◽  
Vol 10 (1) ◽  
pp. 33-43
Author(s):  
Iva Melčáková ◽  
Tomáš Růžovič
Keyword(s):  
Sorption Capacity ◽  
Contact Time ◽  
Invasive Plant ◽  
Plant Biomass ◽  
Sorption Data ◽  
Reynoutria Japonica ◽  
Filamentous Green Algae ◽  
Low Concentrations ◽  
Stems And Leaves ◽  
Ph Level

In the present study, the sorption capacity of plant biomass has been studied; particularly the ability of biomass algae Chlorella vulgaris, filamentous green algae Spirogyra sp. and roots, stems and leaves of an invasive plant Reynoutria japonica to bind up Zn2+ ions. The results of this biosorption study revealed that the rate and extent of uptake were affected by pH level, contact time and initial metal concentration. The maximum uptake of metal ions was obtained at pH 6.0. The equilibrium sorption data for metal system at pH 6 were described by the Langmuir isotherms model. For Zn2+, sorption capacity qmax of 17 mg/g was achieved using biomass from leaves. Removal of Zn2+ with 1g of biosorbent from leaves was almost 77% when present in low concentrations, whereas it is lower at higher concentrations.

A Comparative Sorption Study of Ni (II) form Aqueous Solution Using Silica Gel, Amberlite IR-120 and Sawdust

2019 ◽  
Vol 233 (9) ◽  
pp. 1275-1292 ◽  
Author(s):  
Atta ul Haq ◽  
Muhammad Rasul Jan ◽  
Jasmin Shah ◽  
Maria Sadia ◽  
Muhammad Saeed
Keyword(s):  
Sorption Capacity ◽  
Silica Gel ◽  
Low Cost ◽  
Sorption Process ◽  
Second Order ◽  
Order Kinetic ◽  
Sorption Data ◽  
Desorption Study ◽  
Pseudo Second Order ◽  
Sorption Study

Abstract The presence of heavy metals in water causes serious problems and their treatment before incorporating into the water body is a challenge for researchers. The present study was conducted to compare the sorption study of Ni (II) using silica gel, amberlite IR-120 and sawdust of mulberry wood in batch system under the influence of pH, initial Ni (II) concentration and contact time. It was observed that sorption process was depending upon pH and maximum sorption was achieved at pH 7.0. Kinetic data were well fitted into pseudo-second order kinetic model due to high R2 values and closeness of experimental sorption capacity and calculated sorption capacity of pseudo-second order. Isotherms study showed that Langmuir is one of the most suitable choices to explain sorption data due to high R2 values. The monolayer sorption capacities of silica gel, amberlite IR-120 and sawdust were found to be 33.33, 25.19, and 33.67 mg g−1, respectively. Desorption study revealed that NaCl is one of the most appropriate desorbent. It may be concluded from this study that sawdust is a suitable sorbent due to low cost, abundant availability and recycling of the materials for further study.

Leach Behavior of SRL TDS-131 Defense Waste Glass in Water at High&Low Flow Rates

1983 ◽  
Vol 26 ◽  
Author(s):  
Aaron Barkatt ◽  
William Sousanpour ◽  
Alisa Barkatt ◽  
Morad A. Boroomand ◽  
Pedro B. Macedo
Keyword(s):  
Contact Time ◽  
Protective Layer ◽  
High Flow ◽  
Low Flow ◽  
Matrix Elements ◽  
Flow Rates ◽  
Low Concentrations ◽  
Controlling Mechanism ◽  
The Matrix ◽  
Leach Behavior

ABSTRACTLeach tests carried out on SRL TDS-131 Defense Waste Class indicate that at high flow rates the controlling mechanism is simple corrosion. The matrix elements (Si, Al) are leached out at rates similar to those of the leaching of the alkalis and of boron, and the leaching process is nearly linear with time. At slow flow rates (below 1 m/yr) leaching becomes controlled by the build-up of a protective layer. Al and most of the Si remain in the leached surface layer. The leach rates decrease in the course of the test before leveling off at constant values which are almost inversely proportional to the contact time, indicating that leachate concentrations have become solubility-limited. The low concentrations observed at this stage indicate the formation of alteration products.

scholarly journals Synthesis and Physico-Chemical Evaluation of Polyurethane Microstructures for Transmembrane Delivery of Reynoutria japonica Extract

2017 ◽  
Vol 54 (4) ◽  
pp. 651-654
Author(s):  
Florina Ardelean ◽  
Razvan Susan ◽  
Florin Borcan ◽  
Alina Moaca ◽  
Diana Simona Antal ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Invasive Plant ◽  
Aqueous Solubility ◽  
Japanese Knotweed ◽  
Reynoutria Japonica ◽  
Good Thermal Stability ◽  
Starting Point ◽  
First Results ◽  
Polymer Microstructures ◽  
Transmembrane Delivery

Polymer microstructures containing plant extracts are a novel technique used to increase the bioavailability of active agents with low aqueous solubility. Japanese knotweed (Reynoutria japonica) is an invasive plant with multiple biomedical properties. The aim of the present study was to obtain and characterize polyurethane microstructures used as a drug delivery system of a Japanese knotweed extract. The results indicate the obtaining of microstructures with an almost neutral pH, with sizes between 540 and 1134 nm, with a medium stability against the tendency to form clusters and a very good thermal stability. These first results present the potential of the obtained polyurethane microstructures as candidates for the transmembrane drug delivery of Japanese knotweed extracts, as a starting point for further bioactivity investigations.

scholarly journals Invasive alien plant species of the southern part of the Nowogard Plain (NW Poland)

2011 ◽  
Vol 21 (1) ◽  
pp. 31-38
Author(s):  
Karolina Konopska
Keyword(s):  
Plant Species ◽  
Invasive Plant ◽  
Field Studies ◽  
Invasive Plant Species ◽  
Alien Plant Species ◽  
Impatiens Glandulifera ◽  
Alien Plant ◽  
Reynoutria Japonica ◽  
Invasive Alien Plant ◽  
Nw Poland

Invasive alien plant species of the southern part of the Nowogard Plain (NW Poland)Investigations on the distribution of selected invasive plant species in southern part of the Nowogard Plain were conducted in the vegetation seasons of years 2008-2010. Field studies were based on the cartogram method. The article shows the distribution of twelve selected invasive plant species:Echinocystis lobata, Heracleum sosnowskyi, Impatiens glandulifera, Impatiens parvifora, Padus serotina, Reynoutria japonica, Robinia pseudacacia, Solidago canadensis, Solidago gigantea, Quercus rubra, Rosa rugosaandAcer negundoin the study area.

scholarly journals Sorption-Capacity Limited Retardation of Radionuclides Transport in Water-Saturated Packing Materials

1984 ◽  
Vol 44 ◽  
Author(s):  
C. Pescatore ◽  
T. Sullivan
Keyword(s):  
Sorption Capacity ◽  
Retardation Factor ◽  
High Level Waste ◽  
Radionuclide Transport ◽  
Breakthrough Time ◽  
Packing Materials ◽  
Sorption Data ◽  
Waste Package ◽  
High Level ◽  
Water Saturated

AbstractRadionuclides breakthrough times as calculated through constant retardation factors obtained in dilute solutions are non-conservative. The constant retardation approach regards the solid as having infinite sorption capacity throughout the solid. However, as the solid becomes locally saturated, such as in the proximity of the waste form-packing materials interface, it will exhibit no retardation properties, and transport will take place as if the radionuclides were locally non-reactive. The magnitude of the effect of finite sorption capacity of the packing materials on radionuclide transport is discussed with reference to high-level waste package performance. An example based on literature sorption data indicates that the breakthrough time may be overpredicted by orders of magnitude using a constant retardation factor as compared to using the entire sorption isotherm to obtain a concentrationdependent retardation factor.

Characterization of biochars from a plant biomass and its effect on lead sorption capacity

2018 ◽  
Vol 108 ◽  
pp. 189-197 ◽  
Author(s):  
Noeline B. Fernandez ◽  
Manohar D. Mullassery ◽  
Diana Thomas ◽  
R Surya ◽  
Y. Jelen Das
Keyword(s):  
Sorption Capacity ◽  
Plant Biomass ◽  
Lead Sorption

Adsorption of CuCl2 on Mg-Al HTlc: Effect of EDTA and Addition Sequences

2012 ◽  
Vol 573-574 ◽  
pp. 150-154
Author(s):  
Yun Bo Zang ◽  
Nai Ying Wu
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Contact Time ◽  
Room Temperature ◽  
Copper Ions ◽  
Sorption Process ◽  
Langmuir Model ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Pseudo Second Order

In this study, removal of copper ions from aqueous solutions by synthetic Mg-Al-HTlc was investigated as a function of contact time, EDTA and addition sequences at room temperature. It is found that HTlc could reduced copper ions concentration effectively. The kinetics closely fit pseudo-second order kinetics with necessary time 9 h to reach equilibrium. The sorption process followed langmuir model. The maximum sorption capacity calculated was found to be 39.4 mg/g. The presence of EDTA and addition sequences could affect sorption of Cu(II) onto HTlc.

scholarly journals Regeneration and growth in crowns and rhizome fragments of Japanese knotweed (Reynoutria japonica) and desiccation as a potential control strategy

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11783
Author(s):  
Jacob W. Lawson ◽  
Mark Fennell ◽  
Mark W. Smith ◽  
Karen L. Bacon
Keyword(s):  
Plant Material ◽  
Invasive Plant ◽  
Maximum Growth ◽  
Maximum Height ◽  
Japanese Knotweed ◽  
Reynoutria Japonica ◽  
Potential Control ◽  
The North ◽  
Growth Increments ◽  
Herbicide Treatment

Reynoutria japonica (Japanese knotweed) is a problematic invasive plant found in many areas of Europe and North America. Notably, in the UK, the species can cause issues with mortgage acquisition. Control of R. japonica is complicated by its ability to regenerate from small fragments of plant material; however, there remains uncertainty about how much (in terms of mass) rhizome is required for successful regeneration. This study investigated the ability of crowns and rhizomes with different numbers of nodes to regenerate successfully from three sites in the north of England, UK. Two of the sites had been subject to herbicide treatment for two years prior to sampling and the third site had no history of herbicide treatment. No significant differences were observed in regenerated stem diameter, maximum height of stem and maximum growth increments among crowns. All traits measured from the planted crowns were significantly greater than those of the planted rhizome fragments and at least one node was necessary for successful regeneration of rhizomes. The smallest initial fragment weight to regenerate and survive the experiment was 0.5 g. Subjecting all plant material to desiccation for 38 days resulted in no regrowth (emergence or regeneration) after replanting. These findings suggest that desiccation could be a valuable management strategy for small to medium scale infestations common in urban settings.

scholarly journals The Effect of Nutrient Regime on Biomass Allocation and Nutrient Accumulation in Red Oak Seedlings

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 859F-859
Author(s):  
Jill C. Larimer ◽  
Dan Struve
Keyword(s):  
Biomass Allocation ◽  
Plant Biomass ◽  
N Fertilizer ◽  
Water Soluble ◽  
Fertilizer Treatment ◽  
Total N ◽  
Whole Plant ◽  
Total Plant Biomass ◽  
Total Plant ◽  
Stems And Leaves

ln Spring 1993, red oaks (Quercus rubra) were propagated from seed. From June through October, plants were fertilized twice daily with 1.4 liters of 20N–10P–20K water-soluble fertilizer solution at concentrations of 0, 25, 50, 100, 200, or 400 ppm N. Destructive harvests were conducted six times at intervals from June through Dec. 1993. Leaf area, stem height, root length, root area, and dry weights of roots, stem, and leaves of harvested plants were measured and tissue nutrient concentrations were analyzed. There was no relationship between whole-plant N concentration and total plant biomass (r = 0). However, there were some linear relationships between total plant N and total plant biomass for an individual fertilizer treatment. Biomass allocation between root, stems, and leaves was very consistent across all fertilizer levels at any one harvest. Percent total N in roots, stems, and leaves also was fairly consistent across fertilizer levels. This was true at each harvest, except the first two, in which a greater percentage of total N was partitioned to the leaves and a smaller percentage was partitioned to the roots in the high (100, 200, 400 ppm N) fertilizer treatments. Whole-plant K concentrations increased with increasing fertilizer level, but decreased over time. Whole-plant P concentrations increased linearly with whole-plant dry weight in the higher (100, 200, 400 ppm N) fertilizer treatments.

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