Halloysite and coconut shell biochar magnetic composites for the sorption of Pb(II) in wastewater: Synthesis, characterization and mechanism investigation

2021 ◽  
pp. 106865
Author(s):  
Shenwan Wang ◽  
Dao Xiao ◽  
Xiaoyan Zheng ◽  
Lili Zheng ◽  
Yang Yang ◽  
...  
Keyword(s):  
Coconut Shell ◽  
Magnetic Composites ◽  
Coconut Shell Biochar

scholarly journals Enhanced phosphate sequestration by Fe(iii) modified biochar derived from coconut shell

RSC Advances ◽  
2019 ◽  
Vol 9 (18) ◽  
pp. 10425-10436 ◽  
Author(s):  
Zhenxing Zhong ◽  
Guowen Yu ◽  
Wenting Mo ◽  
Chunjie Zhang ◽  
Hao Huang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Coconut Shell ◽  
Modified Biochar ◽  
Coconut Shell Biochar

In this work, a novel Fe-modified coconut shell biochar (Fe-CSB) was synthesized and utilized to remove phosphate from aqueous solution.

scholarly journals Herbaceous Perennial Seed Germination and Seedling Growth in Biochar-amended Propagation Substrates

HortScience ◽  
2018 ◽  
Vol 53 (2) ◽  
pp. 236-241 ◽  
Author(s):  
Benjamin K. Hoover
Keyword(s):  
Seed Germination ◽  
Seedling Growth ◽  
Primary Root ◽  
Dry Weight ◽  
Coconut Shell ◽  
Two Dimensional ◽  
Positive Effects ◽  
Herbaceous Perennial ◽  
Coconut Shell Biochar ◽  
Biochar Amendment

The first objective of this study was to assess the effects of coconut shell biochar in propagation substrate on seed germination and seedling growth of Coreopsis grandiflora (Hogg ex Sweet) ‘Early Sunrise’, Leucanthemum ×superbum (Bergman ex J. Ingram) ‘Silver Princess’, and Eschscholzia californica (Cham.). Cornell seed germination mix was amended with the biochar (0%, 5%, 10%, 20%, or 40%, v/v). Seed germination and seedling growth were determined during a 21-day period in two germination rooms. This particular biochar amendment did not affect final germination percentage for any of the species. All three species had seedling shoot and primary root length growth with low to moderate positive correlation (r = 0.33–0.54) with coconut shell biochar amendment volume. Coreopsis seedling dry weight was significantly higher with 40% biochar than the control (P ≤ 0.05). The second objective of the study was to compare digitally collected data with manually collected data. Two-dimensional scans of Coreopsis and Leucanthemum seedlings were collected. Seedling dry weight (mg) and seedling length (mm) predicted seedling two-dimensional area for Coreopsis (R2 = 0.73, P < 0.001) and Leucanthemum (R2 = 0.87, P < 0.001). Digitally traced shoot and root lengths were strongly positively correlated (r = 0.99–0.97) with manual ruler measurements, suggesting that digital imaging could replace manual length measurements. The results of this study suggest inclusion of this particular coconut shell biochar in seed germination, and establishment substrates can have neutral or positive effects on herbaceous perennial germination and establishment.

scholarly journals Mechanism of Oxytetracycline Removal by Coconut Shell Biochar Loaded with Nano-Zero-Valent Iron

2021 ◽  
Vol 18 (24) ◽  
pp. 13107
Author(s):  
Qi Li ◽  
Siyu Zhao ◽  
Yuhang Wang
Keyword(s):  
Single Molecule ◽  
Zero Valent Iron ◽  
Ion Concentration ◽  
Coconut Shell ◽  
Batch Adsorption ◽  
Isothermal Adsorption ◽  
Pseudo Second Order ◽  
Nano Zero Valent Iron ◽  
Addition Amount ◽  
Coconut Shell Biochar

In this paper, coconut shell biochar (BC), pickling biochar (HBC), and nano-zero-valent iron-loaded biochar (nZVI-HBC) were prepared; these were used to remove oxytetracycline (OTC), and the removal mechanism and degradation product were analyzed. These biochars were characterized using SEM, XRD, FTIR, and XPS. The effects of biochar addition amount, pH, ion type, and ion concentration on OTC adsorption were studied by a batch adsorption experiment. Under the optimal conditions, the equilibrium adsorption capacity of nZVI-HBC to OTC was 196.70 mg·g−1. The adsorption process can be described by Langmuir isothermal adsorption equations, conforming to the pseudo-second-order dynamics model, indicating that adsorption is dominated by single-molecule chemical adsorption, and a spontaneous process of increasing heat absorption entropy. Mass spectrometry showed that the OTC removal process of nZVI-HBC included not only adsorption but also degradation. These results provide a practical and potentially valuable material for the removal of OTC.

scholarly journals Phytostabilization of Cd and Pb in Highly Polluted Farmland Soils Using Ramie and Amendments

2020 ◽  
Vol 17 (5) ◽  
pp. 1661 ◽  
Author(s):  
Mo-Ming Lan ◽  
Chong Liu ◽  
Shi-Jiao Liu ◽  
Rong-Liang Qiu ◽  
Ye-Tao Tang
Keyword(s):  
Heavy Metal ◽  
Low Cost ◽  
Organic Fertilizer ◽  
Coconut Shell ◽  
Polluted Soils ◽  
Simultaneous Application ◽  
Mine Sites ◽  
Effective Stabilization ◽  
Coconut Shell Biochar

In-situ remediation of heavy-metal-contaminated soil in farmland using phytostabilization combined with soil amendments is a low-cost and effective technology for soil pollution remediation. In this study, coconut shell biochar (CB, 0.1% and 0.5%), organic fertilizer (OF, 3.0%), and Fe-Si-Ca material (IS, 3.0%) were used to enhance the phytostabilization effect of ramie (Boehmeria nivea L.) on Cd and Pb in highly polluted soils collected at Dabaoshan (DB) and Yangshuo (YS) mine sites. Results showed that simultaneous application of CB, OF, and IS amendments (0.1% CB + 3.0% OF + 3.0% IS and 0.5% CB + 3.0% OF + 3.0% IS, DB-T5 and DB-T6) could significantly increase soil pH, reduce the concentrations of CaCl2-extractable Cd and Pb, and increase the contents of Ca, P, S, and Si in DB soil. Under these two treatments, the growth of ramie was significantly improved, its photosynthesis was enhanced, and its levels of Cd and Pb were reduced, in comparison with the control (DB-CK). After applying DB-T5 and DB-T6, the concentrations of Cd and Pb in roots were decreased by 97.7–100% and 64.6–77.9%, while in shoots they were decreased by up to 100% and 92.9–100%, respectively. In YS-T4 (0.5% CB + 3.0% OF), the concentrations of Cd and Pb in roots were decreased by 39.5% and 46.0%, and in shoots they were decreased by 44.7% and 88.3%. We posit that phytostabilization using ramie and amendments could reduce the Cd and Pb bioavailability in the soil mainly through rhizosphere immobilization and plant absorption. In summary, this study suggests that the use of tolerant plant ramie and simultaneous application of coconut shell biochar, organic fertilizer, and Fe-Si-Ca materials is an effective stabilization strategy that can reduce Cd and Pb availabilities in soil. Ultimately, this strategy may reduce the exposure risk of crops to heavy metal pollution in farmland.

scholarly journals The Influence of ZnCl2 Activation on Macronutrient NPK Adsorption Simultaneously Using Coconut Shell Biochar for Soil Fertility Improvement

Molekul ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. 75
Author(s):  
Candra Purnawan ◽  
Christina Candra Dewi ◽  
Syafrudin Syafrudin ◽  
Bimastyaji Surya Ramadan ◽  
Mochamad Arief Budihardjo ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Soil Fertility ◽  
Functional Group ◽  
Coconut Shell ◽  
Wave Number ◽  
Activated Biochar ◽  
Soil Adsorption ◽  
Zncl2 Activation ◽  
Soil Fertility Improvement ◽  
Coconut Shell Biochar

The influence of ZnCl2 activation on macronutrient Nitrogen, Phosphor, Potassium (NPK) adsorption simultaneously using Coconut Shell Biochar for soil fertility improvement has been conducted. Biochar formation is carried out at temperature up to 500 oC using variation in the concentration of ZnCl2 0,5; 1,0; 1,5; 2,0; dan 2,5 M. The biochar formed was characterized using Fourier Transform InfraRed (FTIR) spectroscopy and Surface Area Analyzer (SAA). Whereas NPK analysis has used the Indonesian standard method (SNI 7763: 2018). Based on this research, it was concluded that the greater the concentration of ZnCl2 activator, indicated that the higher intensity of the spectra of –OH and –NH2 at wave number 3400 cm-1 and 1600 cm-1. It showed that biochar activation was higher and a more active functional group was opened. Increasing the concentration of ZnCl2 activator has increased Biochar adsorption of NPK macronutrients. The optimum condition for activation of coconut shell Biochar was activation with ZnCl2 2.5 M. The addition of activated Biochar was increased soil adsorption on NPK macronutrients. Biochar addition had increased Nitrogen (N) adsorption up to 23.53%, Phosphor (P) up to 200%, and Potassium (K) up to 41.24%.

Adsorption of Cd2+ and Pb2+ onto coconut shell biochar and biochar-mixed soil

2016 ◽  
Vol 75 (6) ◽  
Author(s):  
G. N. Paranavithana ◽  
K. Kawamoto ◽  
Y. Inoue ◽  
T. Saito ◽  
M. Vithanage ◽  
...  
Keyword(s):  
Coconut Shell ◽  
Coconut Shell Biochar

scholarly journals Removal of NO3-N in alkaline rare earth industry effluent using modified coconut shell biochar

2019 ◽  
Vol 80 (4) ◽  
pp. 784-793 ◽  
Author(s):  
Hanyang You ◽  
Yi Zhang ◽  
Wenying Li ◽  
Yang Li ◽  
Yanfei Ma ◽  
...  
Keyword(s):  
Rare Earth ◽  
Kinetic Model ◽  
Electrostatic Attraction ◽  
Coconut Shell ◽  
Order Kinetic ◽  
N Removal ◽  
Adsorption Temperature ◽  
Order Kinetic Model ◽  
Industry Effluent ◽  
Coconut Shell Biochar

Abstract Coconut shell biochar (CSB) was selected as raw material to obtain two kinds of modified biochars by pickling and iron modification. The pickling coconut shell biochar (PCSB) and pickling-iron modified coconut shell biochar (PICSB) were used as adsorbents to remove NO3-N in alkaline rare earth industry effluent. The results showed that pickling smoothed the surface of CSB, and α-FeOOH was formed on the surface of PCSB because of FeCl3 solution modification. Suitable adsorbent dosages of PCSB and PICSB were both 2.0 g/L. The NO3-N adsorption process by PCSB and PICSB both reached equilibrium at 30 min. The quasi-first-order kinetic model shows good fit to the NO3-N adsorption by PCSB. Whereas, the quasi-second-order kinetic model is more suitable for PICSB adsorbing NO3-N. The adsorption mechanisms of PICSB for NO3-N removal were ligand exchange and electrostatic attraction, and that of PCSB for NO3-N removal was electrostatic attraction. The NO3-N adsorption amounts of PCSB and PICSB decreased with increasing adsorption temperature and pH. The maximum NO3-N adsorption amounts of PCSB and PICSB were 15.14 mg/L and 10.75 mg/L respectively with adsorbent dosage of 2.0 g/L, adsorption time of 30 min, adsorption temperature of 25 ± 1 °C, and initial solution pH of 2.01.

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