scholarly journals PARAMETER EFFECTS OF PH, DOSAGE AND CONTACT TIME ON BORON REMOVAL FROM SYNTHETIC SEA WATER USING MORINGA OLEIFERA SEEDS

2020 ◽  
Vol 21 (2) ◽  
pp. 12-24
Author(s):  
Mohammed Saedi Jami ◽  
Nur Syahirah Zakaria ◽  
Moussa Ahmed ◽  
Nik Rashida Nik Abdul Ghani ◽  
Mohammed Ngabura ◽  
...  
Keyword(s):  
Contact Time ◽  
Moringa Oleifera ◽  
Sea Water ◽  
Ph Value ◽  
Saline Water ◽  
Human Life ◽  
Freundlich Isotherm ◽  
Human Beings ◽  
Adsorption Parameters ◽  
Effects Of Ph

Boron is one of the key elements required in flora, fauna, as well as human beings. However, human life and eco-systems could be seriously affected when exposed to excessive levels of boron, especially in seawater and groundwater. In this work Moringa oleifera was selected as a precursor adsorbent owing to its eco-friendliness characteristics and favourable removal efficiency of adsorbates. Besides, M. oleifera does not significantly affect the conductivity of water and pH value after the treatment. The main aim of this work was to investigate the potentiality of M. oleifera in the treatment of boron from contaminated saline water. The effect of adsorption parameters such as pH (7 - 9), adsorbent dose of 4000 – 8000 mg/L of solution and contact time of 60 – 180 min was thoroughly investigated. Face-centred Central Composite Design (FCCCD) was applied to optimize these parameters. Consequently, the highest percentage of removal (65%) was achieved at the pH of 8, 120 min of contact time and 6000 mg/L of adsorbent dosage. The adsorption studies stated that the adsorption fitted well with the Freundlich isotherm. Therefore, the outcome of this work revealed that boron could be significantly treated using a prepared adsorbent from M. oleifera. ABSTRAK: Boron merupakan salah satu elemen yang diperlukan oleh flora, fauna, juga manusia. Walau bagaimanapun, hidup manusia dan ekosistem pasti terkesan apabila di dedahkan secara berlebihan, terutama pada air di lautan dan daratan. Kajian ini menggunakan Moringa oleifera sebagai penjerap kerana ia mempunyai ciri-ciri mesra dan berkesan membuang bahan terjerap dengan berkesan. Selain itu, M. oleifera tidak langsung memberi kesan kepada konduktiviti air dan nilai pH selepas perawatan. Tujuan utama kajian ini adalah mengkaji potensi M. oleifera dalam larutan rawatan air garam boron yang tercemar. Kesan parameter penjerapan seperti pH (7-9), dos penjerapan 4000 – 8000 mg/L larutan dan masa interaksi 60 – 180 minit di kaji dengan teliti. Kaedah Komposisi Tumpuan Tengah Muka (FCCCD) digunakan bagi mengoptimumkan parameter-parameter ini. Hasilnya, peratus tertinggi penyingkiran adalah sebanyak (65%) pada pH 8, 120 min masa interaksi dan 6000 mg/L dos penjerapan. Kesimpulannya, kajian penjerapan ini menyokong kuat teori isoterma Freundlich. Oleh itu, hasil kajian ini menunjukkan boron dapat dirawat dengan menggunakan larutan penjerapan daripada M. oleifera.

Nano-ZrO2/TiO2 Impregnated Orange Wood Sawdust and Peach Stone Shell Adsorbents for Cr (VI) Removal

2020 ◽  
Vol 16 (7) ◽  
pp. 880-892
Author(s):  
Şerife Parlayıcı ◽  
Kübra Tuna Sezer ◽  
Erol Pehlivan
Keyword(s):  
Contact Time ◽  
Ph Value ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
Wood Sawdust ◽  
Adsorption Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Equilibrium Status

Background: In this work, Cr (VI) adsorption on nano-ZrO2๏TiO2 impregnated orange wood sawdust (Zr๏Ti/OWS) and nano-ZrO2๏TiO2 impregnated peach stone shell (Zr๏Ti/PSS) was investigated by applying different adsorption parameters such as Cr (VI) concentrations, contact time, adsorbent dose, and pH for all adsorbents. Methods: The adsorbents were characterized by SEM and FT-IR. The equilibrium status was achieved after 120 min of contact time and optimum pH value around 2 were determined for Cr (VI) adsorption. Adsorption data in the equilibrium is well-assembled by the Langmuir model during the adsorption process. Results: Langmuir isotherm model showed a maximum adsorption value of OWS: 21.65 mg/g and Zr๏Ti/OWS: 27.25 mg/g. The same isotherm displayed a maximum adsorption value of PSS: 17.64 mg/g, and Zr๏Ti/PSS: 31.15 mg/g. Pseudo-second-order kinetic models (R2=0.99) were found to be the best models for describing the Cr (VI) adsorption reactions. Conclusıon: Thermodynamic parameters such as changes in ΔG°, ΔH°, and ΔS° have been estimated, and the process was found to be spontaneous.

Nanoparticle Fe3O4 magnetized activated carbon from Armeniaca sibirica shell for the adsorption of Hg(II) ions

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 6100-6120
Author(s):  
Yinan Hao ◽  
Yanfei Pan ◽  
Qingwei Du ◽  
Xudong Li ◽  
Ximing Wang
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Entropy Change ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
Initial Concentration

Armeniaca sibirica shell activated carbon (ASSAC) magnetized by nanoparticle Fe3O4 prepared from Armeniaca sibirica shell was investigated to determine its adsorption for Hg2+ from wastewater. Fe3O4/ASSAC was characterized using XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), SEM (scanning electron microscopy), and BET (Brunauer–Emmett–Teller). Optimum adsorption parameters were determined based on the initial concentration of Hg2+, reaction time, reaction temperature, and pH value in adsorption studies. The experiment results demonstrated that the specific surface area of ASSAC decreased after magnetization; however the adsorption capacity and removal rate of Hg2+ increased 0.656 mg/g and 0.630%, respectively. When the initial concentration of Hg2+ solution was 250 mg/L and the pH value was 2, the adsorption time was 180 min and the temperature was 30 °C, and with the Fe3O4/ASSAC at 0.05 g, the adsorption reaching 97.1 mg/g, and the removal efficiency was 99.6%. The adsorption capacity of Fe3O4/ASSAC to Hg2+ was in accord with Freundlich isotherm models, and a pseudo-second-order kinetic equation was used to fit the adsorption best. The Gibbs free energy ΔGo < 0，enthalpy change ΔHo < 0, and entropy change ΔSo < 0 which manifested the adsorption was a spontaneous and exothermic process.

Pseudo-Second-Order Kinetics for the Adsorption of Uranyl Ion onto Peat at Different pH Value

2010 ◽  
Vol 113-116 ◽  
pp. 33-36
Author(s):  
Zhi Rong Liu ◽  
Qin Qin Tao ◽  
Chuan Xi Wen
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Ph Value ◽  
Second Order ◽  
Uranyl Ions ◽  
Batch Tests ◽  
Effects Of Ph ◽  
Pseudo Second Order

Batch tests were used to investigate the effects of pH and contact time on the adsorption capability of peat. The results indicate that adsorption of uranyl ions on peat increase with increasing pH from 1 to 5. However it takes longer contact time to reach the adsorption equilibrium with increase of pH from 1 to 5. The adsorption process can be described by type 1 of the pseudo-second-order kinetics excellently.

scholarly journals Application of Moringa in the Removal of Salts from the Desalinator Reject

2019 ◽  
pp. 1-13
Author(s):  
A. J. Gomes Filho ◽  
S. C. de Paiva ◽  
G. M. C. Takaki ◽  
A. S. Messias
Keyword(s):  
Contact Time ◽  
Moringa Oleifera ◽  
Chemical Elements ◽  
Saline Water ◽  
Physical Chemical ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Whole Seed ◽  
Semi Arid ◽  
Moringa Oleifera Lam

This study aims to analyze the reject produced by the desalinators implanted in the semi-arid Pernambuco in contact with the seeds of Moringa oleifera Lam. For this, Moringa seeds were collected and prepared with the following treatments: reject (control), reject with whole seed with and without husks, reject with crushed seed with and without husks, seed residue with and without husks, in five replicas. Each replica was constituted with doses equivalent to 2.0 g of Moringa seeds for 200 mL of reject, with contact time corresponding to 30, 60, 120 and 180 minutes, in a completely randomized design, under laboratory conditions, total of 140 experimental units. The physical-chemical and statistical analyses were performed through analysis of variance (ANOVA), and the F test, at confidence interval of 95%. It has been found through laboratory tests that seeds with crushed or ground Moringa husks are equally effective at adsorbing sodium from 1,868,0 mg/L to 24,6 mg/L (98,7 %), calcium from 1,005.0 mg/L to 894.6 mg/L (11%), magnesium from 741.0 mg/L to 728.3 mg/L (1.7%) and chloride from 6,997.5 mg/L to 6,782.4 mg/L (1.8%). Therefore, Moringa seed can be considered promising in the adsorption of chemical elements of saline water desalinizers.

Kinetics and Thermodynamics of Sodium Alginate/Hydroxyapatite Composite Adsorption Fiber for Cd(II) Adsorping

2013 ◽  
Vol 743-744 ◽  
pp. 578-583 ◽  
Author(s):  
Zhi Yun Song ◽  
Wang Xiao ◽  
Jun Hao ◽  
Yong Zhu Cui ◽  
Li Hua Lv ◽  
...  
Keyword(s):  
Sodium Alginate ◽  
Adsorption Kinetics ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
High Concentration ◽  
Kinetics And Thermodynamics ◽  
Hydroxyapatite Composite ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Physical And Chemical

In this study, kinetics and thermodynamics of sodium alginate/ hydroxyapatite composite adsorption fiber for adsorping Cd () were studied. The morphology and structure were characterized by SEM and IR, and the effects of pH value and bath ratio on Cd () adsorption were discussed. The model of adsorption kinetics and thermodynamics were simulated, and the parameters were calculated. The results showed that the sodium alginate/hydroxyapatite composite adsorption fiber possessed good adsorption ability towards Cd (). The optimum adsorption was found at the pH value of 6-7. High removal percent of more than 90% at low concentration and high concentration of Cd () was obtained at the bath ratio of 1:100 and 1:1000, respectively. The adsorption kinetics and thermodynamics studies showed that the pseudo-second-order model and Freundlich isotherm described the adsorption behaviors well. The thermodynamic parameters indicated that the adsorption of Cd () onto sodium alginate/hydroxyapatite composite adsorption fiber was physical and chemical sorption, endothermic in nature.

Co-Sorption Characteristics of Zn(II) and As(V) on Mixed Fe/Al-PILCs

2013 ◽  
Vol 681 ◽  
pp. 26-30
Author(s):  
Su Yuan Wu ◽  
Hong Zheng ◽  
Peter G. Weidler ◽  
Peng Cai
Keyword(s):  
Aqueous Solutions ◽  
Langmuir Isotherm ◽  
Contact Time ◽  
Room Temperature ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Single System ◽  
Batch System ◽  
Maximum Sorption ◽  
Sorption Characteristics

Co-sorption characteristics of Zn(II) and As(V) on the mixed Fe/Al-PILCs was investigated in a batch system at room temperature. The effects of relevant parameters, such as pH value of solution, adsorbent dosage, initial Zn(II) and As(V) concentrations and contact time were examined, respectively. The results show that co-sorption capacities and co-sorption rates of Zn(II) and As(V) by Fe/Al-PILC are higher and faster than those of single Zn(II) or single As(V) by Fe/Al-PILC. Co-sorption isotherm data of Zn(II) and As(V) by Fe-Al-PILC were fitted well to Langmuir isotherm and the maximum sorption capacities of Zn(II) and As(V) on mixed Fe-Al-PILCs (Q0) are 16.98 mg/g and 16.29 mg/g, respectively, which are higher than those in single system. n>1 from Freundlich isotherm indicate that the sorption of Zn(II) and As(V) by Fe-Al-PILC is favorable. E values from D-R model indicate that the type of sorption of Zn(II) and As(V) by Fe-Al-PILC is physical. The results indicate that there is significant potential for Fe/Al-PILCs as an adsorbent material for Zn(II) and As(V) removal from aqueous solutions.

scholarly journals Biosorption of zinc from aqueous solution by cyanobacterium Fischerella ambigua ISC67: optimization, kinetic, isotherm and thermodynamic studies

2018 ◽  
Vol 78 (7) ◽  
pp. 1525-1534 ◽  
Author(s):  
Moein Safari ◽  
Salman Ahmady-Asbchin
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Bacterial Biomass ◽  
Freundlich Isotherm ◽  
Ion Concentration ◽  
Infrared Analysis ◽  
Order Kinetic ◽  
Biosorption Process ◽  
Initial Ph ◽  
Effects Of Ph

Abstract In this present study, biosorption of Zn(II) from aqueous solution by cyanobacterium Fischerella ambigua was investigated in batch experiments. The effects of pH, bacterial dosage, initial Zn(II) concentration, contact time and temperature were studied. Removal process was influenced significantly by the variation of pH, biosorbent concentration, initial Zn(II) ion concentration, temperature and contact time. Optimum biosorption conditions were found to be initial pH of 5, bacterial dosage of 0.2 g/l and initial Zn(II) ion concentration of 175 mg/l at room temperature and contact time of 90 min. The maximum uptake capacity of F. ambigua for Zn(II) ions was found to be 98.03 mg/g at optimum conditions. The correlation coefficient for the second-order kinetic model was 0.995. The Freundlich isotherm model showed better fit to the equilibrium of the system, compared with the Langmuir model. Fourier transform infrared analysis of bacterial biomass revealed the presence of carboxyl, hydroxyl, sulfite and amino groups, which are likely responsible for the biosorption of Zn(II). The negative values of Gibbs free energy, ΔG°, confirm the spontaneous nature of the biosorption process. Finally, F. ambigua adsorption capacity was compared with other biosorbents. Results showed that F. ambigua was an efficient biosorbent in the removal of Zn(II) ions from an aqueous solution.

scholarly journals Removal of Cr(VI) and Cu(II) Ions from Aqueous Solution by Carbon Prepared from Henna Leaves

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
T. Shanthi ◽  
V. M. Selvarajan
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Metal Removal ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Lawsonia Inermis ◽  
Experimental Conditions ◽  
Initial Concentration ◽  
Adsorbent Dosage

Carbon prepared from leaves of henna (Lawsonia inermis) was used to study the adsorption of Cr(VI) and Cu(II) ions from their aqueous solutions. The experimental conditions which include pH, contact time, initial concentration, and adsorbent dosage on the metal removal were investigated. The capacity of adsorption depends on pH value; it increases with an increase in pH value from 1 to 7 and then decreases. The highest percentage of metal removal was achieved in the adsorbent dosage of 0.7 g and at an initial concentration of 100 ppm metal ion. The adsorption isotherm studies revealed that data was confirmed with both the Langmuir and Freundlich isotherm models. The removal percentage was found to be higher for Cu(II) when compared with Cr(VI). The potential of carbon prepared from henna leaves for the removal of these two solutions containing heavy metals was substantiated.

scholarly journals Treatment of wastewater from a dairy plant by adsorption using synthesized copper oxide nanoparticles: kinetics and isotherms modeling optimization

2021 ◽  
Author(s):  
Nada M. Al-Ananzeh
Keyword(s):  
Copper Oxide ◽  
Contact Time ◽  
Adsorption Process ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Copper Oxide Nanoparticles ◽  
Batch Adsorption ◽  
Oxide Nanoparticles ◽  
Sophora Japonica ◽  
Kinetics And Isotherms

Abstract Dairy plants produce 1 to 4 liters of wastewater per one liter of processed milk. The wastewater contains high values of COD and BOD concentrations, in addition to high levels of dissolved solids. In this study, synthesized copper oxide nanoparticles (CuONPs) coupled with Sophora Japonica fruit, were used as an adsorbent, for the first time, to treat the effluent of dairy plants in a batch adsorption process. The analysis techniques, FTIR, XRD and SEM were utilized to characterize the adsorbent. The COD removal, using (CuONPs)-based adsorbent, was investigated by varying contact time, masses of the adsorbent, initial COD value and temperatures. The optimum conditions for highest removal percentage were contact time of 120 minutes, a temperature of 25 °C, pH value of 7.5, and 1 g of adsorbent. The initial COD values used were in the range of 100–700 ppm. The COD percent removal was in the range of 77 to 95%. Freundlich isotherm exhibited the best fitting for the results (R2 = 0.998) with a favorable spontaneous exothermic adsorption process. Based on the calculated normalized deviation value, the modified diffusion model, intra-diffusion, and pseudo-second order kinetics all showed very good fitting for the adsorption data as indicated by the kinetics study.

Adsorption of chromium ion (VI) by activated coal modified with aminoprophylthriehoxylsilane – 3

2020 ◽  
pp. 42-49
Author(s):  
Nasanjargal Sh ◽  
Ganchimeg Yu ◽  
Burmaa G ◽  
Munkhpurev B ◽  
Zolzaya Z ◽  
...  
Keyword(s):  
Contact Time ◽  
Freundlich Isotherm ◽  
Isotherm Model ◽  
Model Parameters ◽  
Maximum Adsorption Capacity ◽  
Adsorption Parameters ◽  
Solution Ph ◽  
Chromium Ion ◽  
Chemically Modified ◽  
Activated Coal

“Tavantolgoi” deposit coal was activated with heated steam at temperature of 850oC for 180 minutes. Activated coal modified with aminopropyltriehoxylsilane-3 (APTES) to produce an adsorbent material for removal of Cr (VI) from aqueoussolution. The adsorption properties of chemically modified coal have been investigated under various adsorption parameters such solution pH, contact time, temperature and mass of adsorbent in order to maximize metal recovery. And thermodynamic and isotherm model parameters of the process were estimated. Optimal adsorption parameters were determined as pH=3, temperature 55оC, contact time 240 minutes and maximum adsorption capacity 12.03 mg/g. Adsorption isotherm followed Freundlich isotherm model and thermodynamic parameters calculated as ΔGо= -16.435 kJ/mol, ΔHо= 7.855 kJ/mol, and ΔSо=78.768 J/mol∙K. Therefore, activated coal modified with aminoprophylthriehoxylsilane – 3 can be used as adsorbent for removal of Cr (VI) from aqueous solution. 3-аминопропилтритоксисиланаар модификацид оруулсан идэвхжүүлсэн нүүрсний хром (VI)-ыг шингээх идэвхийн судалгаа Хураангуй: Тавантолгойн чулуун нүүрсний ордын 8-р амны нүүрсийг 240 минутын турш 850оС температурт усны уураар идэвхжүүлж 3-аминопропилтритоксисилан (3-АПТС)-аар модификацид оруулан шингээгч материал гаргав. Гарган авсан шингээгч материалын усан уусмал дахь хром (VI) ионыг шингээх идэвхийг уусмалын орчин, температур, шингээлтийн хугацаа болон шингээгч материалын жингээс хамааруулан судалсан. Туршилтаар шингээгч материалын хром (VI) шингээх оновчтой орчин рН=3, шингээлтийн хугацаа 240 мин, температур 55оС ба шингээлтийн багтаамж нь 12.03 мг/г болохыг тогтоов. Шингээлтийн процесс нь Фрейндлихийн изотерм загварын дагуу явагдаж буй бөгөөд шингээгч материалын Cr(VI) ионыг шингээх процессын термодинамик үзүүлэлтүүдийг тооцоолоход Гиббсийн энерги ΔGо=-16.435 кЖ/моль, энтальпийн өөрчлөлт ΔHо=7.855 кЖ/моль, энтропийн өөрчлөлт ΔSо=78.768 Ж/моль∙К байна. Иймд 3-аминопропилтритоксисиланаар модификацид оруулсан идэвхжүүлсэн нүүрснийг усан уусмалаас Cr(VI) ялгах шингээгч материалаар ашиглах боломжтой гэж үзэж байна. Түлхүүр үг: Идэвхжүүлсэн нүүрс, 3-аминопропилтритоксисиланий модификаци, шингээлт, хүнд металл, хром (VI), изотерм

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