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| 1 | Highly degradable chitosan-montmorillonite (MMT) nanocomposite hydrogel for controlled fertilizer release显示文摘Fertilizer consumption is increasing drastically along with the rapid expansion of farming in response to the ever-growing population. However, a significant portion of the nutrients in traditional fertilizers is lost during leaching and runoff causing economic loss and environmental threats. Polymer-modified controlled-release fertilizers provide an opportunity for mitigating adverse environmental effects and increasing the profitability of crop production. Here, we present a cheap and easy-to-fabricate controlled-release fertilizer excipient based on hydrogels scaffolded by safe and biodegradable chitosan and montmorillonite (MMT) nanoclays. By introducing elastic and flexible physical crosslinking induced by 2-dimensional (2D) MMT nanoflakes into the chitosan hydrogel, highly swellable and degradable chitosan-MMT nanocomposites were fabricated. The addition of MMT into the chitosan hydrogels enhanced the total release of phosphorous (P) and potassium (K), from 22.0 % to 94.9 % and 9.6% to 31.4 %, respectively, compared to the pure chitosan gel. The chitosan-MMT nanocomposite hydrogel achieved a well-controlled overall fertilizer release in soil. A total of 55.3 % of loaded fertilizer was released over 15 d with a daily release of 2.8 %. For the traditional fertilizer podwer, 89.2 % of the fertilizer was washed out during the first irrigation under the same setup. In the meantime, the nanocomposites improved the water retention of the soil, thanks to its excellent water absorbency. Moreover, the chitosan-MMT nanocomposite hydrogels exhibited high degradation of 57 % after swelling in water for 20 d. Such highly degradable fertilizer excipient poses minimal threat to the long-term fertility of the soil. The engineered Chitosan-MMT biopolymer scaffold as a controlled-release fertilizer excipient provides a promising opportunity for advancing sustainable agriculture. | Zeou Dou Maria Vitoria Bini Farias Wensi Chen Dongjing He Yuhang Hu Xing Xie | 2023 | Frontiers of Environmental Science & Engineering2023，17，5： | 0 |
| 2 | Salinity exchange between seawater/brackish water and domestic wastewater through electrodialysis for potable water显示文摘Two-thirds of the world’s population has limited access to potable water.As we continue to use up our freshwater resources,new and improved techniques for potable water production are warranted.Here,we present a general concept called“salinity exchange”that transfers salts from seawater or brackish water to treated wastewater until their salinity values approximately switch,thus producing wastewater with an increased salinity for discharge and desalinated seawater as the potable water source.We have demonstrated this process using electrodialysis.Salinity exchange has been successfully achieved between influents of different salinities under various operating conditions.Laboratory-scale salinity exchange electrodialysis(SEE)systems can produce high-quality desalinated water at~1 mL/min with an energy consumption less than 1 kWh/m3.SEE has also been operated using real water,and the challenges of its implementation at a larger scale are evaluated. | Mourin Jarin Zeou Dou Haiping Gao Yongsheng Chen Xing Xie | 2023 | Frontiers of Environmental Science & Engineering2023，17，2： | 0 |
| 3 | Correction to: Highly degradable chitosan-montmorillonite (MMT) nanocomposite hydrogel for controlled fertilizer release显示文摘The authors regret that there is an error in Fig.4(a)of the original version of the above article.The“GA weight”values in the legend should be half.For example,2.3%should be 1.15%.The corrected Fig.4 is below.In addition,the“2.3 wt%GA”in the second line of the caption for Fig.2 should be“1.15 wt%GA”.The cause of these errors was that the glutaraldehyde(GA)stock solution we purchased and used to in our experiment was 50 wt%GA in water rather than 100 wt%GA.The authors would like to apologize for any inconvenience caused. | Zeou Dou Maria Vitoria Bini Farias Wensi Chen Dongjing He Yuhang Hu Xing Xie | 2023 | Frontiers of Environmental Science & Engineering2023，17，8： | 0 |
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