Comprehensive evaluation of bioavailable phosphorus in biochar synthesized by co-pyrolysis of sewage sludge and straw ash

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 954, P. 176679 - 176679

Published: Oct. 2, 2024

Language: Английский

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Harnessing the Waste-to-Wealth Potential of Saraca asoca Plant-Derived Nanoparticles for the Sustainable Removal of Cationic Dyes through Regenerative Adsorption

Industrial & Engineering Chemistry Research, Journal Year: 2023, Volume and Issue: 62(44), P. 18312 - 18324

Published: Oct. 30, 2023

This study showcases the successful synthesis of Saraca asoca nanoparticles (SANPs) and their efficacy as adsorbents for a range cationic dyes, namely, malachite green (MG), methylene blue (MB), crystal violet (CV). SANPs have been characterized through techniques such powder X-ray diffraction, Fourier transform infrared, dynamic light scattering, scanning electron microscopy, transmission microscopy. photoelectron spectroscopy analysis confirms different oxidation states elements, including carbon, potassium, calcium, phosphorus, silicon, oxygen. Using Debye–Scherrer equation, average crystallite size has estimated to be 27 nm. Synthesized illustrate highly effective adsorption toward MB, CV, MG, demonstrating maximum efficiencies 495, 404, 943 mg/g, respectively. Furthermore, mechanism follows pseudo-second-order reaction, Langmuir isotherm indicating chemisorption monolayer formation. Besides this, high efficiency may due combined effect diffusion adsorption. To confirm practical viability feasibility, encapsulated within alginate beads were developed that also exhibited MG removal with significant regenerative ability multiple consecutive cycles. alginate-encapsulated beads, therefore, align current sustainable development goals.

Language: Английский

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Phosphorus adsorption from aqueous solutions using different types of cement: kinetics, isotherms, and mechanisms

RSC Advances, Journal Year: 2024, Volume and Issue: 14(22), P. 15637 - 15646

Published: Jan. 1, 2024

Exploring low-cost and high-performance phosphorus (P) adsorbents is key to controlling P contamination in water. This study evaluated the adsorption performance of three types cement: Ordinary Portland cement (OPC), slag (PSC), pozzolana (PPC). Furthermore, SEM-EDS, XRD, XPS, FTIR were employed reveal mechanism. The results showed that pseudo-second-order model exhibited higher regression coefficients than pseudo-first-order model, indicating chemisorption dominated process. Langmuir equation fitted data well, with maximum capacities 245.8, 226.1, 210.0 mg g-1 for OPC, PSC, PPC at 25 °C, respectively. decreased gradually increasing initial pH reached their values 3. anions F-, CO32-, SO42- negatively affected due competitive Ca2+. confirmed Ca-P precipitates (i.e., hydroxyapatite) main removal A real domestic sewage experiment 0.6 g L-1 OPC effectively reduced concentration from 2.4 below 0.2 L-1, a dosage cost 0.034 $ per ton. indicated cement, as efficient adsorbent, has great potential application removing acidic neutral wastewater.

Language: Английский

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Sludge-Based Superparamagnetic Nano-Sorbent Functionalized by Lanthanum Silicate Nanorods for Phosphorus Adsorption and Fertilization

Recycling, Journal Year: 2024, Volume and Issue: 9(4), P. 53 - 53

Published: June 24, 2024

Phosphorus (P) recovery from wastewater is considered to be a positive human intervention towards sustainable P use in the global cycle. This study investigated feasibility of synthesizing superparamagnetic nano-sorbent that was functionalized by lanthanum silicate nanorods (NRLa-Si) using drinking water treatment sludge (DWTS), evaluating both its adsorption capacity and fertilization effect. The DWTS-based La-modified (P-sorbent D) exhibited complicated but single-layer-dominant for phosphate, with maximum up 26.8 mg/g, which superior most similar sludge-based P-sorbent. NRLa-Si-modified P-sorbent D identified several characterization techniques leaching metal elements were tested, below limits proposed Food Agriculture Organization United Nations. In addition, growth vigorousness Arabidopsis thaliana indicated exhausted could used as potential water-soluble moderate-release fertilizer, also confirmed well-fitted uptake model desorption pattern sorbent–fertilizer. doped play dual role complexation enhancement health/growth promotion. light this, this new way reclaiming DWTS fertilization, offering insights into path toward “closing loop”.

Language: Английский

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高钙酿酒沼渣制备生物炭吸附剂及其土壤改良性能

Earth Science-Journal of China University of Geosciences, Journal Year: 2024, Volume and Issue: 49(6), P. 2227 - 2227

Published: Jan. 1, 2024

摘要: 为解决酿酒沼渣的资源化问题,采用热解法制备沼渣生物炭,通过批量吸附试验和盆栽试验考察其吸附性能和土壤改良性能.结果表明:700 ℃下限氧热解1.5 h所制备的高钙沼渣生物炭,初始pH为10时,吸附量最大,投加10 g·L-1的沼渣生物炭对实际废水COD、NH4+-N和TP的去除率分别可达45.29%、56.10%和86.33%,吸附符合拟一阶动力学模型和Langmuir等温吸附,属于物理吸附.吸附后生物炭表面C、N、P、O元素含量显著增加,出现新的N-H、P=O基团.当投加5%的吸附后生物炭时,土壤中速效磷、速效钾及有机质的含量均显著提高,小白菜生长得到促进.本研究探索了"一处理两用"的策略,为酿酒沼渣处置和资源回收提供了一种本土方法. 关键词: 酿酒沼渣 / 生物炭 吸附剂 废水处理 土壤改良

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