Adsorption and leaching characteristics of ammonium and nitrate from paddy soil as affected by biochar amendment

Biochar plays a key role in nitrogen cycling, potentially affecting nitrogen adsorption and leaching when applied to soils. The laboratory experiments were conducted to investigate the adsorption characteristics of rice straw biochar (RSBC) to ammonium (NH4+) and nitrate (NO3–) and the influence of RSBC on leaching characteristics of NH4+ and NO3– at different soil depths using multi-layered soil columns. The results showed that the adsorption characteristics were significantly fitted with Freundlich and Langmuir adsorption isothermal curve models. The Freundlich isotherm model indicated that RSBC has relatively higher adsorption capacity and adsorption intensity to NH4+ than NO3–. Moreover, the Langmuir isotherm model showed that the maximum adsorption capacity of RSBC to NH4+ and NO3– were 31.25 and 10.00 mg/g, respectively. The leaching experiments showed that the contents of NH4+ in the leachates from the soil columns showed significant differences at different depths depending on the application amount of RSBC. Compared with CK (0% RSBC amendment), the overall cumulative losses of NH4+ via leaching were decreased by 23.3, 35.1 and 13.7% after adding 2, 4 and 6% RSBC, respectively. Correspondingly, the contents of residual soil NH4+ in the soil column were increased significantly with the RSBC amendment at different depths. However, the losses of NO3– via leaching from the soil columns could not be retarded obviously by RSBC. Therefore, the application of an appropriate biochar rate is beneficial to retard the losses of soil NH4+ from paddy soil.

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Fabrication of Carboxymethylcellulose/Metal-Organic Framework Beads for Removal of Pb(II) from Aqueous Solution

Materials ◽

10.3390/ma12060942 ◽

2019 ◽

Vol 12 (6) ◽

pp. 942 ◽

Cited By ~ 10

Author(s):

Huo-Xi Jin ◽

Hong Xu ◽

Nan Wang ◽

Li-Ye Yang ◽

Yang-Guang Wang ◽

...

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Photoelectron Spectroscopy ◽

Langmuir Isotherm ◽

Adsorption Equilibrium ◽

Isotherm Model ◽

Maximum Adsorption Capacity ◽

X Ray ◽

Metal Organic ◽

Langmuir Isotherm Model

The ability to remove toxic heavy metals, such as Pb(II), from the environment is an important objective from both human-health and ecological perspectives. Herein, we describe the fabrication of a novel carboxymethylcellulose-coated metal organic material (MOF-5–CMC) adsorbent that removed lead ions from aqueous solutions. The adsorption material was characterized by Fourier-transform infrared spectroscopy, X-ray diffractometry, scanning electron microscopy, and X-ray photoelectron spectroscopy. We studied the functions of the contact time, pH, the original concentration of the Pb(II) solution, and adsorption temperature on adsorption capacity. MOF-5–CMC beads exhibit good adsorption performance; the maximum adsorption capacity obtained from the Langmuir isotherm-model is 322.58 mg/g, and the adsorption equilibrium was reached in 120 min at a concentration of 300 mg/L. The adsorption kinetics is well described by pseudo-second-order kinetics, and the adsorption equilibrium data are well fitted to the Langmuir isotherm model (R2 = 0.988). Thermodynamics experiments indicate that the adsorption process is both spontaneous and endothermic. In addition, the adsorbent is reusable. We conclude that MOF-5–CMC is a good adsorbent that can be used to remove Pb(II) from aqueous solutions.

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Synthesis and evaluation of activated carbon/nanoclay/ thiolated graphene oxide nanocomposite for lead(II) removal from aqueous solution

Water Science & Technology ◽

10.2166/wst.2019.071 ◽

2019 ◽

Vol 79 (3) ◽

pp. 466-479 ◽

Cited By ~ 8

Author(s):

Fatemeh Mojoudi ◽

Amir Hossein Hamidian ◽

Yu Zhang ◽

Min Yang

Keyword(s):

Graphene Oxide ◽

Activated Carbon ◽

Adsorption Capacity ◽

Isotherm Model ◽

Bet Surface Area ◽

Polluted Water ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

High Adsorption ◽

Fast Kinetics

Abstract Novel porous nanocomposite (AC/NC/TGO) was successfully synthesized through the composition of activated carbon, nanoclay and graphene oxide as a Pb(II) adsorbent for the treatment of contaminated aqueous environment. The physicochemical properties and morphology of AC/NC/TGO were examined by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and nitrogen adsorption-desorption techniques. Results showed Pb(II) adsorption on the AC/NC/TGO was rapid in the first 20 min and reached equilibrium in 40 min. Kinetic studies showed significant fit to the pseudo second order kinetic model (R2 ≥ 0.9965) giving an equilibrium rate constant (K2) of 0.0017 g mg−1 min−1 for Pb(II) loaded. The experimental adsorption data were better fitted with the Langmuir isotherm model than with the Freundlich isotherm model. Prepared nanocomposite exhibited high values of Brunauer–Emmett–Teller (BET) surface area of 1,296 m2 g−1 and total pore volume of 1.01 cm3 g−1. Maximum adsorption capacity (Qmax = 208 mg g−1) and a relatively high adsorption rate was achieved at pH 5.0 using an adsorbent dose of 0.5 g L−1 and an initial lead concentration of 50 mg L−1. High adsorption capacity, reusability, fast kinetics and simple synthesis method indicate that prepared nanocomposite can be suggested as a high-performance adsorbent for Pb(II) removal from polluted water.

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Biocompatible LDH-Alginate Composites for the Adsorption of Naphthalene Anionic Dye AG 120: Influence of Alginate Concentration on the Adsorption Characteristics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.906.112 ◽

2014 ◽

Vol 906 ◽

pp. 112-117 ◽

Cited By ~ 1

Author(s):

Sanil Sebastian ◽

Suseeladevi Mayadevi ◽

Sujata Mandal

Keyword(s):

Adsorption Capacity ◽

Sodium Alginate ◽

Layered Double Hydroxide ◽

Maximum Adsorption Capacity ◽

Biological Applications ◽

Adsorption Characteristics ◽

Alginate Concentration ◽

Double Hydroxide ◽

Acid Blue ◽

Acid Blue 120

Layered double hydroxide (MgAl LDH) and its composites containing different quantities of sodium alginate were synthesized. The adsorption characteristics of these materials were evaluated for the adsorption of Acid Blue 120 (AB 120). The adsorption capacity of the composites for the dye was higher than that of pristine LDH. The adsorption capacity varied with alginate concentration and was the highest when the alginate concentration was 5.9 wt%. The maximum adsorption capacity of the composite enhanced by 40%, compared to pristine MgAl LDH. The rate of adsorption of the dye on the composites was also higher than that of pristine MgAl LDH up to an alginate concentration of 11%. The results reveal that LDH composites are more efficient adsorbents compared to pure LDH. Sodium alginate, being a biopolymer can also improve the biocompatibility of the LDH for biological applications.

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A Study of the Adsorption and Removal of Sb(III) from Aqueous Solution by Fe(III) Modified Proteus cibarius with Mechanistic Insights Using Response Surface Methodology

Processes ◽

10.3390/pr9060933 ◽

2021 ◽

Vol 9 (6) ◽

pp. 933

Author(s):

Xiaojian Li ◽

Renjian Deng ◽

Zhie Tang ◽

Saijun Zhou ◽

Xing Zeng ◽

...

Keyword(s):

Response Surface Methodology ◽

Adsorption Capacity ◽

Response Surface ◽

Adsorption Process ◽

Isotherm Model ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Adsorption Time ◽

Initial Concentration ◽

Adsorbent Dose

Environmental pollution caused by excessive Sb(III) in the water environment is a global issue. We investigated the effect of processing parameters, their interaction and mechanistic details for the removal of Sb(III) using an iron salt-modified biosorbent (Fe(III)-modified Proteus cibarius (FMPAs)). Our study evaluated the optimisation of the adsorption time, adsorbent dose, pH, temperature and the initial concentration of Sb(III). We use response surface methodology to optimize this process, determining optimal processing conditions and the adsorption mechanism evaluated based on isotherm model and adsorption kinetics. The results showed that—(1) the optimal conditions for the adsorption of Sb(III) by FMPAs were an adsorption time of 2.2 h, adsorbent dose of 3430 mg/L, at pH 6.0 and temperature 44.0 °C. For the optimum initial concentration of Sb(III) 27.70 mg/L, the removal efficiency of Sb(III) reached 97.60%. (2) The adsorption process for Sb(III) removal by FMPAs conforms to the Langmuir adsorption isotherm model, and its maximum adsorption capacity (qmax) is as high as 30.612 mg/g. A pseudo-first-order kinetic model provided the best fit to the adsorption process, classified as single layer adsorption and chemisorption mechanism. (3) The adsorption of Sb(III) takes place via the hydroxyl group in Fe–O–OH and EPS–Polyose–O–Fe(OH)2, which forms a new complex Fe–O–Sb and X≡Fe–OH. The study showed that FMPAs have higher adsorption capacity for Sb(III) than other previously studied sorbents and with low environmental impact, it has a great potential as a green adsorbent for Sb(III) in water.

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A Study on Adsorption of Heavy Metals with Zeolite and FeS Media

Journal of Korean Society of Environmental Engineers ◽

10.4491/ksee.2020.42.7.349 ◽

2020 ◽

Vol 42 (7) ◽

pp. 349-359

Author(s):

Gimin Lee ◽

Gyuri Kim ◽

Sungkyu Choi ◽

Tae-jin Lee

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Reaction Kinetics ◽

Adsorption Capacity ◽

Second Order ◽

Maximum Adsorption Capacity ◽

Adsorption Characteristics ◽

Removal Of Heavy Metals ◽

Pseudo Second Order ◽

Kinetics Of

Objectives:Adsorption characteristics in aqueous solution were investigated to effectively remove heavy metals by the crystallization of FeS and reaction kinetics were analyzed to compare with heavy metal adsorption characteristics of zeolite.Methods:The adsorption characteristics of each media were analyzed using Langmuir adsorption isotherm, and the adsorption reaction kinetics of heavy metals (Pb, Cu, Zn) on zeolite and FeS media were analyzed by a pseudo-first or pseudo-second order reaction kinetics.Results and Discussion:The maximum adsorption capacity of zeolite was highest in Pb, and the adsorption preference was in the order of Pb>Cu>Zn. In the case of FeS media, Cu was found to have a higher adsorption capacity than Pb or Zn, and the adsorption preference was observed to be Cu>Pb>Zn. It was found that the adsorption mechanism is based on chemical adsorption (chemisorption) because adsorption of each heavy metal onto zeolite or FeS media is more suitable for pseudo-second order kinetics.Conclusions:It was found that the removal of heavy metals through FeS media has a different pattern from zeolite, and when comparing the adsorption capacity of each media, it was found that FeS media is more effective for Zn or Cu except Pb.

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Selective and rapid removal of Mo(VI) from water using functionalized Fe3O4-based Mo(VI) ion-imprinted polymer

Water Science & Technology ◽

10.2166/wst.2020.594 ◽

2020 ◽

Author(s):

Lang Wu ◽

Zhengwei Luo ◽

Hui Jiang ◽

Zijian Zhao ◽

Wenhua Geng

Keyword(s):

Adsorption Capacity ◽

Isotherm Model ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Ion Imprinted Polymer ◽

Imprinted Polymer ◽

Adsorption Selectivity ◽

X Ray ◽

Ion Imprinted ◽

Adsorption Desorption

Abstract Fe3O4 nanoparticles-based magnetic Mo(VI) surface ion-imprinted polymer (Mo(VI)-MIIP) was elaborated employing 4-vinyl pyridine as a functional monomer. The adsorbent preparation was confirmed by Fourier-transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectrometry, X-ray diffraction, vibrating sample magnetometer, thermogravimetric analysis, and surface area analysis. Batch adsorption experiments displayed that the maximum adsorption capacity of Mo(VI)-MIIP was 296.40 mg g−1 at pH 3, while that of the magnetic non-imprinted polymer (MNIP) was only 147.10 mg g−1. The adsorption isotherm model was well-fitted by the Langmuir isotherm model. The adsorption experiments revealed that Mo(VI)-MIIP reached adsorption equilibrium within 30 min, and the kinetics data fitting showed that the pseudo-second-order kinetics model suitably described the adsorption process. Mo(VI)-MIIP exhibited an excellent adsorption selectivity to Mo(VI) in binary mixtures of Mo(VI)/Cr(VI), Mo(VI)/Cu(II), Mo(VI)/H2PO44-, Mo(VI)/Zn(II), and Mo(VI)/I–, with relative selectivity coefficients toward MNIP of 13.71, 30.27, 20.01, 23.53, and 15.89, respectively. After six consecutive adsorption-desorption cycles, the adsorption capacity of Mo(VI)-MIIP decreased by 9.5% (from 228.4 mg g−1 to 206.7 mg g−1 at initial Mo(VI) concentration of 250 mg L−1), demonstrating its reusability.

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Phenol adsorption on industrial activated carbon: evaluation of efficiency

Vodosnabzhenie i sanitarnaia tehnika ◽

10.35776/vst.2021.06.05 ◽

2021 ◽

pp. 49-54

Author(s):

С.А.А. Ахмед ◽

Е.С. Гогина

Keyword(s):

Activated Carbon ◽

Adsorption Capacity ◽

High Efficiency ◽

Freundlich Isotherm ◽

Isotherm Model ◽

Maximum Adsorption Capacity ◽

Phenol Removal ◽

Ph Variation ◽

Wide Ph Range ◽

Coconut Shells

Адсорбция фенола на активированном угле считается одной из наиболее эффективных систем очистки сточных вод. В связи с этим изучена эффективность двух промышленных активированных углей российского производства для очистки сточных вод от фенола. Образцы включают порошкообразный активированный уголь (производимый из березового угля) и дробленый активированный уголь (производимый из скорлупы кокосового ореха). Исследование проведено в условиях изменения pH, влияния времени контакта и различных начальных концентраций фенола на процесс адсорбции. Исследование дополнительно расширено для выяснения кинетики адсорбции и модели изотерм Ленгмюра и Фрейндлиха. Результаты показали, что активированный уголь сохраняет максимальную адсорбционную способность в широком диапазоне pH – от 2 до 9. Это доказывает применимость угля для удаления фенола из различных сточных вод. Механизм адсорбции с использованием обоих образцов активированных углей следовал псевдовторому порядку и соответствовал модели изотермы Ленгмюра. Максимальная адсорбционная способность составила 185,19 и 172,41 мг/г для порошкообразного и дробленого угля соответственно, что свидетельствует о высокой эффективности удаления фенола из сточных вод. The adsorption of phenol on activated carbon is considered one of the most efficient wastewater treatment systems. In this regard, the effectiveness of two Russian manufactured industrial activated carbon types in removing phenol from wastewater has been studied. The samples included powdered activated carbon (made from birch charcoal) and crushed activated carbon (made from coconut shells). The study was carried out under the conditions of pH variation and the effect of contact time and different initial concentrations of phenol on the adsorption process. The study was further expanded to clarify the adsorption kinetics and the Langmuir and Freundlich isotherm model. The results showed that activated carbon retained the maximum adsorption capacity over a wide pH range of 2 to 9. This fact proves the usability of coal for removing phenol from various wastewater types. The adsorption mechanism using both activated carbon samples followed the pseudo-second order and corresponded to the Langmuir isotherm model. The maximum adsorption capacity was 185.19 and 172.41 mg/g for powdered and crushed coal, respectively, suggesting a high efficiency of phenol removal from wastewater.

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Preparation of ureido-functionalized PVA/silica mesoporous fibre membranes via electrospinning for adsorption of Pb2+ and Cu2+ in wastewater

Water Science & Technology ◽

10.2166/wst.2017.405 ◽

2017 ◽

Vol 76 (9) ◽

pp. 2526-2534 ◽

Cited By ~ 6

Author(s):

Meimei Zhou ◽

Weizhen Tang ◽

Pingping Luo ◽

Jiqiang Lyu ◽

Aixia Chen ◽

...

Keyword(s):

Electron Microscopy ◽

Adsorption Capacity ◽

Freundlich Isotherm ◽

Isotherm Model ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Transmission Electron ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Adsorption Desorption

Abstract Ureido-functionalized mesoporous polyvinyl alcohol/silica composite nanofibre membranes were prepared by electrospinning technology and their application for removal of Pb2+ and Cu2+ from wastewater was discussed. The characteristics of the membranes were investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and N2 adsorption-desorption analysis. Results show that the membranes have long ﬁbrous shapes and worm-like mesoporous micromorphologies. Fourier transform infrared spectroscopy confirmed the membranes were successfully functionalized with ureido groups. Pb2+ and Cu2+ adsorption behavior on the membranes followed a pseudo-second-order nonlinear kinetic model with approximately 30 minutes to equilibrium. Pb2+ adsorption was modelled using a Langmuir isotherm model with maximum adsorption capacity of 26.96 mg g−1. However, Cu2+ adsorption was well described by a Freundlich isotherm model with poor adsorption potential due to the tendency to form chelating complexes with several ureido groups. Notably, the membranes were easily regenerated through acid treatment, and maintained adsorption capacity of 91.87% after five regeneration cycles, showing potential for applications in controlling heavy metals-related pollution and metals reuse.

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Isolasi Kitosan Dari Tudung Jamur Merang (Vollvariella Volvaceae) Dan Aplikasinya Sebagai Absorben Logam Timbal (Pb)

Indo J Chem Res ◽

10.30598//ijcr.2018.6-mat ◽

2018 ◽

Vol 6 (1) ◽

pp. 44-50

Author(s):

Matheis F.J.D.P. Tanasale ◽

Adriani Bandjar ◽

Natasya Sewit

Keyword(s):

Experimental Data ◽

Molecular Weight ◽

Adsorption Capacity ◽

Langmuir Isotherm ◽

Freundlich Isotherm ◽

Isotherm Model ◽

Maximum Adsorption Capacity ◽

Langmuir Isotherm Model ◽

Ftir Spectrophotometry ◽

Chitin And Chitosan

Chitosan isolated from mushroom (Vollariella volvaceae) as adsorbent of lead (Pb) metal has been done. The isolation of chitosan was obtained 2.94% from total weight of mushroom. Fungtional groups of chitin and chitosan were indentified by using FTIR spectrophotometry. The chitosan had 74.66% degree of deacetylation and 2.09 x 104 g/mol viscosity molecular weight. The experimental data of the chitosan as adsorbent for Pb metal were correlated with the Langmuir and Freundlich isotherm model. The maximum adsorption capacity of Pb based on the Langmuir isotherm model was 2.66 mg/g.

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Research of Vertical Migration and Occurrence of Cd and As in Acid Paddy Soil under Simulated Irrigation

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/943/1/012004 ◽

2021 ◽

Vol 943 (1) ◽

pp. 012004

Author(s):

Ren Jie ◽

Wen Zhan ◽

Lu Guochun

Keyword(s):

Adsorption Capacity ◽

Vertical Migration ◽

Paddy Soil ◽

Irrigation Water ◽

Water Injection ◽

Soil Columns ◽

Binding Ability

Abstract According to the research of vertical migration and occurrence of Cd and As in acid paddy soil, the conclusions are as follows. The longitudinal migration of Cd in TZkb1, TZ1, TZ2, TZ3 and TZ5 found that Cd in the upper and lower layers of soil columns all lost to varying degrees with the increase of water injection contents (irrigation years). With the longitudinal leaching of irrigation water, when the adsorption capacity of the soil was greater than the water injection and rinsing capacity, the trend of accumulation (TZ4-TZ6) further appeared. The vertical migration results of As in TZkb1, TZ1, TZ2, TZ3 and TZ5 found that As mainly accumulated in the upper layer of soil columns. Without considering other output ways, it can be seen that the binding ability of As to acid paddy soil was stronger than Cd, and its cumulative efficiency in 20 years was higher than Cd. However Cd cumulative efficiency of TZ3 and TZ5 in acid paddy soil may be greater than As with time. In general, As was less affected by irrigation water on vertical leaching of soil columns compared with Cd.

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