scholarly journals Preparation and characterization of rice husk adsorbents for phenol removal from aqueous systems

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0243540
Author(s):  
Samah Babiker Daffalla ◽  
Hilmi Mukhtar ◽  
Maizatul Shima Shaharun
Keyword(s):  
Aqueous Solutions ◽  
Surface Area ◽  
Rice Husk ◽  
Physicochemical Characterization ◽  
Renewable Resource ◽  
Pollutant Removal ◽  
Phenol Removal ◽  
Chemically Treated ◽  
Thermally Treated

Rice husk is a base adsorbent for pollutant removal. It is a cost-effective material and a renewable resource. This study provides the physicochemical characterization of chemically and thermally treated rice husk adsorbents for phenol removal from aqueous solutions. We revealed new functional groups on rice husk adsorbents by Fourier transform infrared spectroscopy, and observed major changes in the pore structure (from macro-mesopores to micro-mesopores) of the developed rice husk adsorbents using scanning electron microscopy. Additionally, we studied their surface area and pore size distribution, and found a greater enhancement of the morphological structure of the thermally treated rice husk compared with that chemically treated. Thermally treated adsorbents presented a higher surface area (24–201 m2.g-1) than those chemically treated (3.2 m2.g-1). The thermal and chemical modifications of rice husk resulted in phenol removal efficiencies of 36%–64% and 28%, respectively. Thus, we recommend using thermally treated rice husk as a promising adsorbent for phenol removal from aqueous solutions.

Preparation and Characterization of Rice Husk Ash for Adsorption of Phenol from Aqueous Solutions

2014 ◽  
Vol 625 ◽  
pp. 498-502
Author(s):  
Samah B. Daffalla ◽  
Hilmi Mukhtar ◽  
Maizatul S. Shaharun
Keyword(s):  
Aqueous Solutions ◽  
Surface Area ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Physiochemical Properties ◽  
Pseudo Second Order

In this research, the development of three (3) low-cost adsorbent materials from abundant waste rice husk was achieved via thermal treatment. The physiochemical properties of the developed adsorbents were evaluated. Their adsorption behaviours in batch system were evaluated for the removal of phenol from aqueous solutions by varying the pH (2 to 10). It was found that, the rice husk ash burned a 400oC for 1hr ‘RHA400,1’ has the highest surface area (201.36 m2.g-1) followed by RHA300,4(87.08 m2.g-1) and RHA600,1(43.22 m2.g-1), respectively. RHA400,1had shown the highest removal efficiency followed by RHA300,4and RHA600,1, towards phenol due to high surface area and porosity. The maximum uptake of phenol was found at pH 4. The adsorption kinetics was well described by both pseudo-second order and the Elovich models.

scholarly journals Preparation and Characterization of the Sulfur-Impregnated Natural Zeolite Clinoptilolite for Hg(II) Removal from Aqueous Solutions

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 217
Author(s):  
Marin Ugrina ◽  
Martin Gaberšek ◽  
Aleksandra Daković ◽  
Ivona Nuić
Keyword(s):  
Chemical Modification ◽  
Aqueous Solutions ◽  
Specific Surface ◽  
Surface Area ◽  
Natural Zeolite ◽  
Contact Time ◽  
Liquid Ratio ◽  
X Ray ◽  
Solid Liquid

Sulfur-impregnated zeolite has been obtained from the natural zeolite clinoptilolite by chemical modification with Na2S at 150 °C. The purpose of zeolite impregnation was to enhance the sorption of Hg(II) from aqueous solutions. Chemical analysis, acid and basic properties determined by Bohem’s method, chemical behavior at different pHo values, zeta potential, cation-exchange capacity (CEC), specific surface area, X-ray powder diffraction (XRPD), scanning electron microscopy with energy-dispersive X-ray analysis (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), as well as thermogravimetry with derivative thermogravimetry (TG-DTG) were used for detailed comparative mineralogical and physico-chemical characterization of natural and sulfur-impregnated zeolites. Results revealed that the surface of the natural zeolite was successfully impregnated with sulfur species in the form of FeS and CaS. Chemical modification caused an increase in basicity and the net negative surface charge due to an increase in oxygen-containing functional groups as well as a decrease in specific surface area and crystallinity due to the formation of sulfur-containing clusters at the zeolite surface. The sorption of Hg(II) species onto the sulfur-impregnated zeolite was affected by the pH, solid/liquid ratio, initial Hg(II) concentration, and contact time. The optimal sorption conditions were determined as pH 2, a solid/liquid ratio of 10 g/L, and a contact time of 800 min. The maximum obtained sorption capacity of the sulfur-impregnated zeolite toward Hg(II) was 1.02 mmol/g. The sorption mechanism of Hg(II) onto the sulfur-impregnated zeolite involves electrostatic attraction, ion exchange, and surface complexation, accompanied by co-precipitation of Hg(II) in the form of HgS. It was found that sulfur-impregnation enhanced the sorption of Hg(II) by 3.6 times compared to the natural zeolite. The leaching test indicated the retention of Hg(II) in the zeolite structure over a wide pH range, making this sulfur-impregnated sorbent a promising material for the remediation of a mercury-polluted environment.

scholarly journals Physicochemical Characterization of 9-Aminocamptothecin in Aqueous Solutions

2013 ◽  
Vol 15 (1) ◽  
pp. 223-229
Author(s):  
Shahidur Rahman ◽  
Deval Patel ◽  
Michalakis Savva
Keyword(s):  
Aqueous Solutions ◽  
Physicochemical Characterization

scholarly journals Preparation and characterization of mesoporous zeolite from solid waste

2020 ◽  
Vol 9 (4) ◽  
pp. 64-69
Author(s):  
Hao Nguyen Truong Gia ◽  
Huy Tran Huynh Gia ◽  
Phuong Nguyen Thi Truc ◽  
Tu Le Nguyen Quang ◽  
Dung Nguyen Van ◽  
...  
Keyword(s):  
Solid Waste ◽  
Surface Area ◽  
Rice Husk ◽  
Pore Volume ◽  
Rice Husk Ash ◽  
Mesoporous Zeolite ◽  
Top Down ◽  
Bottom Up ◽  
Gel Composition

In this study, experimental results on mesoporous zeolite preparation from a common solid waste, the rice husk ash by a top-down and bottom-up approach were reported. In top-down method, the consecutive treatments of zeolite by acid and alkaline in the presence of a cationic surfactant (CTAB) successfully generated mesopores in the zeolite. In bottom-up method, the sufficient added amount of CTAB in the gel composition could form mesopores in the zeolite. The obtained mesoporous zeolite possessed mesopore with a size of around 3-6 nm in both top-down and bottom-up approaches. As a result, the pore volume of the mesoporous zeolite was significantly increased by more than 60% when comparing to the “parent” rice-husk-ash derived zeolite. Significantly, the mesopore surface area of the mesoporous zeolite could be 2.4 times higher than that of the parent zeolite.

scholarly journals Physicochemical characterization of six commercial hydroxyapatites for medical-dental applicatons as bone graft

2005 ◽  
Vol 13 (2) ◽  
pp. 136-140 ◽  
Author(s):  
Marcio Baltazar Conz ◽  
José Mauro Granjeiro ◽  
Gloria de Almeida Soares
Keyword(s):  
Electron Microscopy ◽  
Quality Control ◽  
Infrared Spectroscopy ◽  
Bone Graft ◽  
Surface Area ◽  
Physicochemical Characterization ◽  
X Ray Diffraction ◽  
Perfect Agreement ◽  
X Ray

The aim of this work was to characterize six hydroxyapatites in granular form for applications in medicine and dentistry as bone graft and to compare with manufacturers' specification. These samples were produced by four different manufacturers, and all of them are easily available in the Brazilian market. Physicochemical characterization was carried out by using electron microscopy (SEM), X-ray diffraction (XRD), infrared spectroscopy (FTIR) and surface area (BET) measurements. The results show that just one hydroxyapatite sample exhibited characterisitics in perfect agreement with the manufacturers' specifications. The studied parameters, namely crystallinity, surface area and composition may be used to estimate hydroxyapatite's biodegradability and as a criterion for quality control.

Physical, chemical and physicochemical characterization of rice husk

2012 ◽  
Vol 114 (6) ◽  
pp. 853-867 ◽  
Author(s):  
Chiu‐Yin Kuan ◽  
Kay‐Hay Yuen ◽  
Min‐Tze Liong
Keyword(s):  
Rice Husk ◽  
Physicochemical Characterization ◽  
Physical Chemical

scholarly journals Effectivity of Indonesian Rice Husk as an Adsorbent for Removing Congo Red from Aqueous Solutions

2021 ◽  
Vol 19 (4) ◽  
pp. 255-265
Author(s):  
Neza Rahayu Paapla ◽  
◽  
Normah Normah ◽  
Tarmizi Taher ◽  
Risfidian Mohadi ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Surface Area ◽  
Rice Husk ◽  
Congo Red ◽  
Freundlich Isotherm ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Order Kinetic ◽  
Isotherm Equation ◽  
Specific Analysis

Indonesian rice husk biochar (RH-BC) was prepared by pyrolysis method at 500°C and characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, surface-area-specific analysis by Brunauer-Emmett-Teller, and scanning electron microscopy. The RH-BC were used as adsorbents for enhancing the adsorption of Congo red compared to pristine rice husk (RH) in aqueous solutions. The results of characterization through surface-area-specific analysis showed the surface area of RH-BC (72.25 m2/g) was ten times higher than RH (7.08 m2/g) owing to high-temperature treatment. The results of the adsorption study showed that the RH and RH-BC followed the pseudo-second-order kinetic model and the Freundlich isotherm equation with maximum adsorption capacities of 85.470 mg/g and 72.993 mg/g for the RH-BC and RH, respectively. The thermodynamic parameters of adsorption indicated spontaneous and endothermic processes. The reusability of the adsorbents (RH and RH-BC) showed that they are potentially suitable for extracting Congo red from aqueous solution up to three adsorption-desorption cycles. Their performance sharply decreases after the fourth and fifth cycles.

Physical, chemical and electric characterization of thermally treated rice husk ash and its potential application as ceramic raw material

2017 ◽  
Vol 28 (4) ◽  
pp. 1228-1236 ◽  
Author(s):  
Iara J. Fernandes ◽  
Felipe A.L. Sánchez ◽  
José R. Jurado ◽  
Amanda G. Kieling ◽  
Tatiana L.A.C. Rocha ◽  
...  
Keyword(s):  
Rice Husk ◽  
Potential Application ◽  
Rice Husk Ash ◽  
Raw Material ◽  
Physical Chemical ◽  
Thermally Treated
Sign in / Sign up

Export Citation Format

Share Document