The Diatomite Modified by PAM and Applied to Adsorb Pb(II) in the Simulated Wastewater

A study of the modified diatomite prepared by the PAM coated on the surface of the raw diatomite and applied to treat the simulated wastewater with intensive concentration of lead ions [Pb(Ⅱ)]. Pb(Ⅱ) has been considered as one of some significantly toxic heavymetals (Cd,Cr,Pb, Mn,Cu,Zn,et al) contaminated the surfacewaters. The results indicated that modification could enhance the diatomite and acidic heavymetal wastewater’s compatibility; Obtained that modified diatomite’s saturated adsorption capacity could reach 66.15~ 68.95mg/g, superior to raw one; At the same time, the comparation of four common adsorbents and modified diatomite’s adsorption capacity under some given conditions showed: modified diatomite > zeolite > vermiculite > raw diatomite > red soil; Observed by SEM, PAM molecule arrayed on the diatomite’s surface smoothly that improved its interior structure and the charge on the surface, even enhanced the sedimentation performance of the diatomite in heavymetal wastewater.

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Kinetics of lead ion biosorption from aqueous solution onto lyophilized Aspergillus niveus

Water Practice & Technology ◽

10.2166/wpt.2010.020 ◽

2010 ◽

Vol 5 (1) ◽

Cited By ~ 6

Author(s):

Hülya Karaca ◽

Turgay Tay ◽

Merih Kıvanç

Keyword(s):

Adsorption Capacity ◽

Correlation Coefficients ◽

Freundlich Isotherm ◽

Second Order ◽

Lead Ions ◽

Lead Ion ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Aspergillus Niveus ◽

Pseudo Second Order

The biosorption of lead ions (Pb2+) onto lyophilized fungus Aspergillus niveus was investigated in aqueous solutions in a batch system with respect to pH, contact time and initial concentration of the ions at 30 °C. The maximum adsorption capacity of lyophilized A. niveus was found to be 92.6 mg g−1 at pH 5.1 and the biosorption equilibrium was established about in 30 min. The adsorption capacity obtained is one of the highest value among those reported in the literature. The kinetic data were analyzed using the pseudo-first-order kinetic, pseudo-second-order kinetic, and intraparticle diffusion equations. Kinetic parameters, such as rate constants, equilibrium adsorption capacities, and related correlation coefficients for the kinetic models were calculated and discussed. It was found that the adsorption of lead ions onto lyophilized A. niveus biomass fit the pseudo-second-order kinetic model well. The Langmuir and Freundlich isotherm parameters for the lead ion adsorption were applied and the Langmuir model agreed better with the adsorption of lead ions onto lyophilized A. niveus.

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Sorption mechanism of lead ions onto manganese oxide-modified diatomite from aqueous solutions

10.5004/dwt.2018.23050 ◽

2018 ◽

Vol 135 ◽

pp. 198-209

Author(s):

Lili Ma ◽

Qinglin Xie ◽

Nanchun Chen ◽

Hui Xu ◽

Qingfeng Yu ◽

...

Keyword(s):

Aqueous Solutions ◽

Manganese Oxide ◽

Lead Ions ◽

Sorption Mechanism ◽

Modified Diatomite

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Adsorption of lead ions on magnetically separable Fe3O4 watermelon composite

Applied Water Science ◽

10.1007/s13201-020-01307-y ◽

2020 ◽

Vol 10 (10) ◽

Author(s):

Kayode Adebowale ◽

Abisola Egbedina ◽

Blessed Shonde

Keyword(s):

Adsorption Capacity ◽

Scale Up ◽

Lead Ions ◽

X Ray Diffraction ◽

Solution Ph ◽

Freundlich Isotherms ◽

Watermelon Rind ◽

Pseudo Second Order ◽

Polar Interactions ◽

Low Dosage

Abstract The search for green methods for the synthesis of eco-friendly and sustainable materials is the focus of many studies. In this paper, magnetite nanoparticles (WM-Fe3O4) were synthesized using watermelon rind as a stabilizing agent and their adsorption capacity for the removal of lead ions was evaluated. The synthesized WM-Fe3O4 was characterized using Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. Adsorption capacity and mechanism of WM-Fe3O4 for the removal of lead ions from water were evaluated. The adsorption isotherms data were well described by both Langmuir and Freundlich isotherms showing the heterogeneous nature of the adsorbent. Adsorption kinetics followed the pseudo-second-order model which confirmed the heterogeneity of the adsorbent and shows that adsorption followed chemisorption. Adsorption capacity was found to be 138 mg/g for lead. The initial solution pH had an influence on the adsorption. The removal efficiency decreased after pH 7. Effect of varying adsorbent mass indicates that a low dosage is required thereby favouring industrial scale up. The adsorption of lead ions was mainly controlled by electrostatic attraction and polar interactions. This adsorbent has potentials for the efficient capture of heavy metals with possibilities for the future replacement of expensive adsorbents.

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Adsorption of rhodamine B and Cr3+ ion onto graphene/chitosan composite

Journal of Computational Methods in Sciences and Engineering ◽

10.3233/jcm-204556 ◽

2020 ◽

pp. 1-12

Author(s):

Yanji Li ◽

Meng Ni ◽

Qiang He ◽

Xiang Li ◽

Wei Zhang ◽

...

Keyword(s):

Adsorption Capacity ◽

Rhodamine B ◽

Ph Value ◽

Removal Rate ◽

Ion Concentration ◽

Particle Diffusion ◽

Solution Ph ◽

Magnetic Chitosan ◽

Correlation Degree ◽

Simulated Wastewater

Graphene and chitosan acted as the adsorbents for simulated wastewater with rhodamine B. The novel material produced by freeze-drying obviously outperformed graphene and chitosan in treating rhodamine B. Factors (e.g., contaminant concentration, reaction time, solution pH value, adsorption dose and temperature) overall impacted the adsorption. The optimal conditions for graphene-chitosan treatment of dyes included the concentration of pollutants at 400 mg/L, the dose of adsorbent as 5 mg, the solution pH at 4 and at 25∘C, and for 12 h, in which the maximal treatment amount reached 858.00 mg/g. The adsorption processes of Chitosan/graphene composites and magnetic Chitosan/graphene composites for simulated wastewater from Rhodamine B reactor followed Langmuir and Freundlich models, respectively. The in-particle diffusion model shows that the adsorption process of the composites for Rhodamine B simulated wastewater is not determined by either surface diffusion or in-particle diffusion. The magnetic Chitosan/graphene composites exhibit high recyclability, which can be respectively reused 3 times and 5 times and retain 80% adsorption capacity after being administrated with Rhodamine B simulated wastewater. By analyzing grey correlation degree, it is demonstrated that the concentration of pollutants and the reaction temperature critically affect the adsorption capacity. The electrochemical treatment with graphite rod for the Cr3+ was under the initial voltage of 30.6 V, at the pH of 5.59, and at the temperature of 18.5∘C; the removal rate of the samples was nearly 62.35% with the chromium ion concentration declined from 0.3333 g/L to 0.1255 g/L.

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Preparation of Modified Polyurethane Fiber and Study of its Lead Ions Adsorption

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.887-888.711 ◽

2014 ◽

Vol 887-888 ◽

pp. 711-715

Author(s):

Xiao Wu ◽

Xin Hua Liu ◽

Cui E Wang ◽

Wei Chao Lv ◽

Hong Zhang Li

Keyword(s):

Adsorption Capacity ◽

Lead Ions ◽

Wet Spinning ◽

Chitosan Powder

Modified polyurethane fiber was prepared by wet spinning method, Different amount of chitosan powder that dissolving in polyurethane solution to get spinning solution were examined. This materials presents excellent adsorption capacity on Pb2+. the absorption type on Pb2+ of this modified fibers was monomolecular. The modified fibers get the maximum adsorption 25.53mg/g when the quality ratio of chitosan and polyurethane was 1:1 under the condition of 30°C and pH 6.

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Study on the modification of Phu Yen diatomite by mixed Fe-Mn oxide and the use of the modified material as an arsenic removal adsorbent in water environment

Vietnam Journal of Catalysis and Adsorption ◽

10.51316/jca.2021.003 ◽

2021 ◽

Vol 10 (1) ◽

pp. 13-20

Author(s):

Thien Tran Vinh ◽

Tu Nguyen Thi Thanh ◽

Son Bui Hai Dang

Keyword(s):

Adsorption Capacity ◽

Arsenic Removal ◽

Water Environment ◽

Surface Characteristics ◽

Reduction Reaction ◽

Arsenic Adsorption ◽

Solution Ph ◽

Mn Oxide ◽

Oxidation Reduction ◽

Modified Diatomite

The paper presents the modification of Phu Yen diatomite by oxidation-reduction reaction between Fe (II) and KMnO4 salts in solution pH = 6 on the diatomite surface. Characteristics of modified materials and the influence of research factors on these characteristics were investigated using techniques XRD, EDX, XPS, SEM, TEM, BET. Arsenic adsorption capacity of modified materials, the influence of environmental factors on the adsorption capacity were also investigated and evaluated. The results showed that mixed oxide-modified diatomite has higher arsenic adsorption capacity than natural diatomite and modified diatomite by individual oxides.

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Sorption and Environmental Risks of Phosphorus in Subtropical Forest Soils

Adsorption Science & Technology ◽

10.1155/2021/5142737 ◽

2021 ◽

Vol 2021 ◽

pp. 1-7

Author(s):

Jianhong Liang ◽

Liuhuan Chen ◽

Ding Liu ◽

Chenxu Yi ◽

Jing Zhu

Keyword(s):

Adsorption Capacity ◽

Forest Soils ◽

Subtropical Forest ◽

Environmental Risks ◽

Red Soil ◽

Soil Types ◽

P Adsorption ◽

P Sorption ◽

Limestone Soil ◽

P Leaching

Phosphorus (P) is one of the key limiting factors for the growth of forests and their net primary productivity in subtropical forest ecosystems. Phosphorus leaching of the forest soil to the catchment and groundwater in karst region is the main source of water eutrophication. Strong P sorption capacity of minerals is generally assumed to be a key driver of P leaching in subtropical ecosystems which varies among different soil types. Here, we estimated P adsorption capacity of the O/A and AB horizon in both limestone soil and red soil of subtropical forests by fitting the Langmuir and Freundlich isotherm to investigate the potential environmental risks of P. The maximum P sorption capacity ( Q m ), P sorption constant ( K L ), P sorption index (PSI), degree of P saturation (DPS), and maximum buffer capacity (MBC) were calculated. The results indicate that Q m of the O/A horizon in both soils were similar. Comparing these two soils, the red soil had a higher K L and MBC in the AB horizon; Q m of limestone soil was larger but K L was lower, indicating that the adsorption capacity of limestone soil was weaker and MBC was lower. There was no significant difference in PSI between the two soils. The DPS values of both soils were below 1.1%, indicating that P saturation is low in both subtropical forest soils due to the lack of marked anthropogenic disturbance. In the O/A horizon, P saturation associated with available P (DPSM3 and DPSOlsen) and that associated with P in the Fe-Al bound state (DPScitrate) were higher in the red soil than in the limestone soil. DPS did not differ significantly in the AB horizon, except for higher DPSM3 and DPScitrate in the red soil. The findings highlight the influence of the soil types on P adsorption. The P adsorption and buffering of red soils were higher than those of limestone soils, indicating a lower risk of P leaching in red subtropical forest soils.

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APLIKASI ABSORBEN DAN FILTER CHITOSAN DARI LIMBAH CANGKANG KEPITING UNTUK MENINGKATKAN KUALITAS AIR YANG MENGANDUNG LOGAM BERAT

GEMA LINGKUNGAN KESEHATAN ◽

10.36568/kesling.v12i1.59 ◽

2014 ◽

Vol 12 (1) ◽

Author(s):

Ngadino . ◽

Koerniasari .

Keyword(s):

Adsorption Capacity ◽

Room Temperature ◽

Lead Ions ◽

Lead Ion ◽

Metallic Ions ◽

Crab Shell ◽

Natural Polymer ◽

Shell Waste ◽

Crab Shell Waste

Chitosan is a natural polymer derived from crab shell waste through a process of deproteination,demineralization, and deacetylation. Chitosan reported to be an effective adsorbent to remove someheavy metals. The main objective of this study is to evaluate the effectiveness of chitosan from crab shellwaste as an adsorbent and filter for increase water quality that contain heavy metals such as mercury(Hg) and lead (Pb). This experimental involved the determination of the adsorption and filter of chitosanfor mercury and lead ion. It was used solution of 500 mg/L lead and 1 mg/L mercury and was addedchitosan 0 %/ 2 % and 4 %. Then the mixture was continuously stirred using magnetic stirrer for 1hours at room temperature. After that solution was filtered and filtrate were analyzed using atomicadsorption spectroscopy to determine amount of lead and mercury adsorbed by chitosan. The resultindicated that the adsorption capacity of chitosan depends strongly on concentration of chitosan and onthe species of metallic ions in the water. The adsorption capacity for the mercury on chitosan was lowerthan lead. Chitosan, a type of biopolymer, is a good adsorbent to remove various kinds of heavy metalions. Chitosan has the highest adsorption capacity for mercury and lead ions because they have functionalgroups such as hydroxyls and amines which can bind mercury and lead ions. This chitosan can be a goodcandidate as adsorbent for adsorption of not only mercury and lead ions but also other heavy metal ions inwater.

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