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棉花秸稈的應(yīng)用研究進展

2024-01-01 00:00:00丁凱澤么錚錚吐爾洪·努爾吐爾遜江·艾依旦
棉花學(xué)報 2024年3期
關(guān)鍵詞:綜合利用生物質(zhì)預(yù)處理

收稿日期:2024-01-22" " "第一作者簡介:丁凱澤(2000―),男,碩士研究生,dingkaize001@sohu.com" " " " "*通信作者:tursun714@xju.edu.cn

基金項目:新疆維吾爾自治區(qū)自然科學(xué)基金(2022D01C29)

摘要:棉花秸稈(棉稈)是棉花生產(chǎn)的副產(chǎn)物,是1種重要的可再生性生物質(zhì)資源,其綜合利用研究對于優(yōu)化能源結(jié)構(gòu)和實現(xiàn)“雙碳”戰(zhàn)略目標具有重要意義。由于結(jié)構(gòu)上的差異,玉米、小麥、水稻等秸稈的成功利用方式難以在棉稈上直接重現(xiàn),而傳統(tǒng)的棉稈處理和應(yīng)用方式會造成資源浪費和環(huán)境污染,因此加強棉稈的綜合利用研究在提升農(nóng)業(yè)廢棄物利用率、改善能源結(jié)構(gòu)、降低環(huán)境污染等方面具有重要作用。從提高棉稈綜合利用效率的角度出發(fā),介紹了棉稈在還田、飼料化、能源化、基料化、原料化等方面的利用模式,并對未來的發(fā)展方向進行了展望,為棉稈的多元化利用提供方法參考和研究思路。

關(guān)鍵詞:生物質(zhì);棉花秸稈;預(yù)處理;綜合利用;再生能源

Research progress in the application of cotton straw

Ding Kaize1, Yao Zhengzheng1, Tuerhong Nuer2, Tursunjan Aydan1*

(1. School of Chemical Engineering and Technology, Xinjiang University/State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Urumqi 830017, China;2. Institute of Veterinary Medicine, Xinjiang Academy of Animal Science, Urumqi 830011, China)

Abstract: Cotton straw is a by-product of cotton production and an important renewable biomass resource, and the study on its comprehensive utilization is of great significance to optimize energy structure and achieve 'dual carbon' goals. Due to the structural differences, the successful application methods of corn, wheat, and rice straw cannot be directly applied to cotton straw. Traditional treatment and application of cotton straw cause resource waste and environmental pollution. Therefore, it is essential to enhance the comprehensive utilization of cotton straw to improve agricultural waste utilization efficiency, optimize energy structure, and reduce environmental pollution. From the perspective of enhancing the comprehensive utilization efficiency of cotton straw, this article summarizes various utilization modes, including straw returning to the field, using them as feed, energy substrate, and raw material, and prospects the future multiuse of cotton straw which will provide methodological reference and research ideas for the diversified utilization of cotton straw.

Keywords: biomass; cotton straw; pretreatment; comprehensive utilization; renewable energy

根據(jù)聯(lián)合國糧食及農(nóng)業(yè)組織(Food and Agriculture Organization, FAO)提供的數(shù)據(jù)[1],2020年棉花總產(chǎn)量排名前5的國家依次是印度、中國、美國、巴西、巴基斯坦(表1)。相應(yīng)地,各國棉花秸稈(以下簡稱棉稈)資源總量排名同上。

國家統(tǒng)計局統(tǒng)計數(shù)據(jù)顯示[2],2023年全國棉花播種面積為278.81萬hm2,棉花總產(chǎn)量為561.8萬t;新疆棉花播種面積為236.93萬hm2,棉花總產(chǎn)量為511.2萬t,約占全國棉花總產(chǎn)量的91.0%。按照棉花的草谷比為5[3]計算,2023年新疆理論棉稈資源總量為2 556.0萬t。綜合2019―2023年新疆棉花播種面積、棉花總產(chǎn)量和理論棉稈資源總量(表2)可得,理論年棉稈資源總量維持在2 500萬t以上,若能將其高效利用,可產(chǎn)生巨大的經(jīng)濟效益。但每年棉花采收后,剩下大量的棉稈沒有被系統(tǒng)地充分利用,造成資源浪費和環(huán)境污染。隨著不可再生的化石能源不斷被消耗以及人們環(huán)保意識的日益提高,棉稈綜合開發(fā)利用研究的重要性逐漸凸顯。

棉稈主要含有纖維素、半纖維素和木質(zhì)素,還含有少量的蛋白質(zhì)、果膠、脂質(zhì)和灰分等,具有低污染、高熱值、易獲取和來源廣等特點,受到研究者的廣泛關(guān)注。由于棉稈的木質(zhì)化程度高于其他農(nóng)作物秸稈,難以直接采用玉米、小麥、水稻等作物秸稈的綜合利用方式,相關(guān)的技術(shù)和生產(chǎn)工藝(設(shè)備)還不成熟,導(dǎo)致棉稈的綜合利用程度較低、利用方式較為落后,所以開發(fā)和完善棉稈的綜合利用已成為亟待解決的問題[4]。

棉稈的應(yīng)用范圍非常廣泛,目前主要有還田、飼料化和能源化,還有基料化與原料化方面的應(yīng)用。此外,棉稈還可用于制備生物炭、填料、氣凝膠和水凝膠等[5-6](圖1)。

1 棉稈還田

棉稈還田分為直接還田與間接還田2種方式。直接還田是在棉花采摘后,棉稈經(jīng)過機械粉碎撒回田間,包括將粉碎的秸稈直接覆蓋在土壤表面、淺旋滅茬式秸稈還田和將秸稈粉碎后深翻入土3種方式。間接還田是秸稈經(jīng)過處理后再還田,包括堆漚式還田、過腹式還田和秸稈生物質(zhì)炭化還田等方式[7]。

1.1 棉稈還田對土壤的影響

棉稈還田具有增加土壤中的有機質(zhì)含量和含水量、降低pH等優(yōu)點[8]。唐鵬飛等[9]通過長期田間定位試驗和室內(nèi)培養(yǎng)試驗,研究棉稈不同還田年限對土壤有機碳及其礦化特征的影響,發(fā)現(xiàn)棉稈還田可以有效增加土壤中的有機質(zhì)含量,提高土壤肥力;棉稈還田還可降低土壤有機碳累積礦化量,使土壤中的有機碳更穩(wěn)定,增強土壤固碳能力與穩(wěn)定性,棉稈連續(xù)還田20年對土壤肥力的提升效果較強。王美琦等[10]研究發(fā)現(xiàn)棉稈還田能夠為微生物的生長提供養(yǎng)分,使土壤中微生物大量生長繁殖,在土壤中分泌更多的酶,并增強多種酶的活性。

1.2 棉稈還田對棉花生長發(fā)育的影響

Mao等[11]進行了1項為期5年的研究,探究濱海鹽堿地區(qū)棉稈留茬還田對棉花產(chǎn)量的影響。經(jīng)研究發(fā)現(xiàn),連續(xù)留茬還田的第4年和第5年,皮棉產(chǎn)量分別增加了22.7%和47.3%。Zhang等[12]在鹽堿地探究了連續(xù)留茬還田與土壤深松對棉花產(chǎn)量的影響,發(fā)現(xiàn)短期棉稈留茬還田提高了棉花產(chǎn)量。但由于地下水位較高,土壤返鹽影響了長期棉稈留茬還田對濱海鹽堿地土壤理化性質(zhì)與棉花產(chǎn)量的改良效果,而土壤深松可以切斷土壤中的毛細管,抑制季節(jié)性返鹽。因此采用棉稈留茬還田與土壤深松相結(jié)合的方式,可優(yōu)化土壤理化性質(zhì)、促進根系生長進而提高棉花產(chǎn)量。Wang等[13]研究發(fā)現(xiàn),在棉稈還田時配施氮肥,對棉花冠層光合能力和產(chǎn)量形成起關(guān)鍵作用,可顯著增加棉花的葉面積指數(shù)、葉片氮素含量、比葉面積和單位面積結(jié)鈴數(shù),且在上述條件下進行連續(xù)還田,籽棉產(chǎn)量逐年增加。

2 棉稈飼料化

棉稈中含有纖維素、半纖維素、木質(zhì)素、粗蛋白質(zhì)、鈣和磷等營養(yǎng)物質(zhì),具有作為反芻動物優(yōu)質(zhì)飼料的潛力。棉稈的飼料化利用主要有2個難點。首先,棉稈中木質(zhì)素較多,導(dǎo)致適口性較差且直接食用的消化率低。其次,棉稈內(nèi)還含有有毒的游離棉酚[14]。游離棉酚可以惰化消化道中一些酶的活性并損害腸道上皮細胞,導(dǎo)致動物消化不良與生長遲緩;還會抑制胃泌素的分泌,引起動物腹脹;游離棉酚進入動物體內(nèi)還會和血液中的鐵結(jié)合,導(dǎo)致動物出現(xiàn)缺鐵性貧血、免疫功能下降、生長遲緩甚至死亡[15-17]。所以要對棉稈進行飼料化處理。

2.1 物理處理法

利用粉碎機切割、粉碎,通過高溫高壓、擠壓、摩擦等手段破壞各組分之間的作用力,使棉稈變得柔軟蓬松、脫毒熟化,從而改善適口性。在此過程中部分纖維素、半纖維素和木質(zhì)素發(fā)生水解,可以縮短后續(xù)微生物處理時間,提高棉稈在動物體內(nèi)的利用效率[18]。研究表明,秸稈經(jīng)過膨化與微生物處理后生產(chǎn)出來的飼料對肉羊的生長與胃腸道發(fā)育有明顯的促進作用[19]。但僅依靠切斷、粉碎、膨化等物理處理法不能提高棉稈的營養(yǎng)價值,同時膨化、蒸汽爆破等方法需要高溫高壓,導(dǎo)致處理成本增加。

2.2 化學(xué)處理法

化學(xué)處理法包括酸處理、堿處理、臭氧處理、氨處理和硫酸亞鐵處理等。其中氨處理是使用一定濃度的含氨溶液(通常為尿素或氨水)浸泡秸稈,比酸堿處理溫和。氨處理能使秸稈中的纖維素、半纖維素和木質(zhì)素等組分分離,從而增大消化液和酶類與秸稈之間的接觸面積,增加消化率,優(yōu)化反芻動物的瘤胃功能[20],并且還能提高秸稈的粗蛋白含量與營養(yǎng)價值[21]。

2.3 生物處理法

生物處理法包括青貯、酶解和微貯等。青貯是在密封的條件下,施加特定的溫度和濕度,利用微生物發(fā)酵。青貯飼料具有適口性好、營養(yǎng)豐富、易被消化吸收、可長期保存等優(yōu)良特性,在畜牧業(yè)發(fā)展中發(fā)揮著重要作用[22-23]。萬江春等[24]研究發(fā)現(xiàn),青貯處理可有效降低棉稈中的游離棉酚含量,添加纖維素酶可顯著降低棉稈青貯飼料的pH和半纖維素含量;纖維素酶與植物乳桿菌可協(xié)同增加棉稈青貯飼料的體外粗蛋白消化率。綜上,添加纖維素酶配合植物乳桿菌處理得到的棉稈青貯飼料的品質(zhì)較好。因此在棉稈飼料化利用方面,可考慮生物發(fā)酵法,并根據(jù)地區(qū)差異開發(fā)特定的微生物處理棉稈,在提高飼料營養(yǎng)價值、改善動物腸道菌群結(jié)構(gòu)的同時,使棉稈擁有更好的適口性、更易于消化。

3 棉稈能源化

在當(dāng)今全球化石能源不斷枯竭與環(huán)境惡化的雙重壓力下,生物質(zhì)能源作為世界第4大能源,可以部分替代傳統(tǒng)化石能源。生物質(zhì)能源通常是由含有可發(fā)酵糖、脂質(zhì)或碳水化合物的生物原料發(fā)酵產(chǎn)生的[25]。作為重要的生物質(zhì),秸稈能源化利用具有重要意義。與玉米秸稈相比,棉稈的燃燒效率更高,燃燒時間更長[26]。棉稈的能源化利用主要包括直接燃燒、氣化、固化和液化等。

3.1 直接燃燒

棉稈直接燃燒是較為傳統(tǒng)的能源化利用模式。通常是將田間收獲的棉稈收集并燃燒以滿足農(nóng)戶生活所需。棉稈直接燃燒亦可用于發(fā)電。與燃煤發(fā)電類似,直接燃燒發(fā)電是指將棉稈直接送入秸稈直燃鍋爐內(nèi)燃燒,產(chǎn)生的高壓過熱蒸汽推動汽輪機做功,帶動發(fā)電機發(fā)電。由于受到原料供應(yīng)和工藝流程的限制,該發(fā)電方式產(chǎn)生的電量一般不超過30 kW·h[27]。該方法下秸稈的利用率低,生態(tài)效益與經(jīng)濟效益較差[28]。

3.2 氣化

棉稈的氣化主要包括熱解氣化和沼氣化。熱解氣化是將棉稈粉碎后在熱解氣化爐中進行燃燒,分解為以一氧化碳(CO)和氫氣(H2)為主的氣體燃料,在棉稈熱解氣化過程中加入催化劑可以提高氣體產(chǎn)率,并減少副產(chǎn)物的生成[29]。Hamad等[30]在氧/燃料當(dāng)量比為0.25、溫度為800 ℃、反應(yīng)時間為90 min的條件下,使用泥灰?guī)r黏土、氫氧化鈣、白云石、氯化鋅和煅燒水泥窯灰催化劑進行生物質(zhì)熱解氣化,結(jié)果表明,氫氧化鈣和水泥窯灰能有效增加氣體產(chǎn)率并且減少焦炭和焦油的產(chǎn)生。棉稈沼氣化是將棉稈通過多種厭氧微生物協(xié)同發(fā)酵,最終轉(zhuǎn)化為沼氣(以甲烷和二氧化碳為主的混合氣體),其中甲烷含量通常為50%~60%,運用此項技術(shù)可大幅減少碳排放[31]。在厭氧發(fā)酵之前,對秸稈進行物理、化學(xué)、生物或者聯(lián)合預(yù)處理可以提高厭氧消化速率并增加沼氣產(chǎn)量[32]。在沼氣發(fā)電方面,我國積極推動生物質(zhì)發(fā)電,先后出臺了《可再生能源發(fā)展“十三五”規(guī)劃》、《完善生物質(zhì)發(fā)電項目建設(shè)運行的實施方案》和《產(chǎn)業(yè)結(jié)構(gòu)調(diào)整指導(dǎo)目錄(2024年本)》等政策鼓勵秸稈沼氣發(fā)電,對農(nóng)林生物質(zhì)發(fā)電項目實行標桿上網(wǎng)電價政策,統(tǒng)一執(zhí)行電價0.75元·(kW·h)-1 [33]。截至2020年,全國沼氣直燃發(fā)電裝機容量達到了50萬kW[34]。

3.3 固化

棉稈的固化是利用機械設(shè)備將棉稈粉碎后再加工成塊狀、棒狀或粒狀燃料的技術(shù)[27],其影響因素包括原料種類、溫度、成型壓力、含水率、粒度、黏合劑和原料顆粒形狀等[35]。在節(jié)能減排方面,由秸稈生產(chǎn)的固化成型燃料的年均碳減排量最大,該技術(shù)對于實現(xiàn)“碳中和”具有重大意義[36]。

在固化前,對棉稈進行適當(dāng)?shù)念A(yù)處理可以提高固化成型燃料的質(zhì)量和熱值。Shi等[37]用水熱法和添加過氧化氫(H2O2)的水熱氧化法預(yù)處理棉稈,發(fā)現(xiàn)水熱法和水熱氧化法預(yù)處理對固化成型燃料的力學(xué)性能、熱穩(wěn)定性、燃燒性能具有顯著影響;230 ℃的水熱預(yù)處理和200 ℃的水熱氧化預(yù)處理棉稈,得到的固化成型燃料的機械性能最佳。此外,棉稈中的堿金屬和堿土金屬可能在燃燒過程中發(fā)揮催化作用。原料的含水率是影響固化的1個重要因素,過高或過低的含水率會導(dǎo)致固化成型燃料成型困難且機械強度低。根據(jù)原料不同,固化時的含水率應(yīng)在8%~20%,其中棉稈固化時的最佳含水率為10%,此時顆粒密度與顆粒耐久性分別為1 368 kg·m-3和98.70%[38]。在固化過程中,添加黏合劑可以大幅降低工藝能耗。棉稈中的木質(zhì)素是天然的黏合劑,此外還可以添加淀粉、氫氧化鈣、氫氧化鈉、膨潤土和羧甲基纖維素鈉等[39]。

3.4 液化

棉稈的液化主要包括快速熱解液化和水熱液化。經(jīng)過液化形成的熱解液體(生物油)含有烷烴、芳香族化合物、酚類衍生物以及少量的酮、酯、醚、胺和醇等[40]。快速熱解液化是指將原料在無氧或缺氧環(huán)境下進行熱降解,并生成以生物油為主的熱化學(xué)過程,產(chǎn)生液體(60%~70%)、固體(30%~40%)和氣體(20%~30%)。棉稈快速熱解得到的液化產(chǎn)物熱值與棉稈相同,但能量密度比棉稈大[41]。快速熱解液化的理想條件為中等溫度、較大的升溫速率、極短的停留時間和快速冷凝[42]。改變快速熱解工藝可以得到不同比例的產(chǎn)物,可用于提煉高附加值的工業(yè)產(chǎn)品。王俊淇[43]通過優(yōu)化反應(yīng)時間、熱解溫度、反應(yīng)物顆粒大小與酸洗濃度等快速熱解的條件,制備內(nèi)醚糖含量較高的生物油,并對內(nèi)醚糖進行提純分析,探究出最佳的工藝條件,在此條件下,內(nèi)醚糖得率達到19.86%(質(zhì)量分數(shù))。

水熱液化是生物質(zhì)原料在亞超臨界水和超臨界水、溶劑和催化劑中穩(wěn)定轉(zhuǎn)化為固體、液體和氣體產(chǎn)物的過程,該過程在250~380 ℃和4~230 bar條件下進行[40]。棉稈中的各組分在熱解液化時存在相互作用。Yang等[44]以棉稈為原料在220 ℃條件下進行水熱轉(zhuǎn)化,探究纖維素、半纖維素、木質(zhì)素和蛋白質(zhì)的熱解行為和相互作用,結(jié)果表明,在水熱過程中,纖維素和半纖維素之間相互抑制,這降低了生物油中酮、醛、醚和醇的含量;纖維素與木質(zhì)素之間的相互作用明顯,促進了酮、醛、酯、酚、脂肪族等低聚物的形成,同時抑制了芳香族和多雜化合物的生成;半纖維素與木質(zhì)素、木質(zhì)素與蛋白質(zhì)之間沒有明顯的交互作用。

棉稈沼氣化技術(shù)按照提純天然氣并網(wǎng)的形式進行估算,沼氣提純成本為0.4元·m-3,天然氣價格為3元·m-3;固化成型技術(shù)中固體燃料價格為600 元·t-1,成本包括磨具費、電費等;為方便統(tǒng)計,將熱解產(chǎn)物——熱解氣、生物油和半焦合并計算,其價格分別為1元·m-3、3 000元·t-1和600元·t-1[45],經(jīng)濟效益如表3所示??梢钥闯龀藷峤猱a(chǎn)物外,在沒有政府補貼的情況下,利用棉稈制備沼氣與固化成型顆粒是處于虧損狀態(tài)的,這是因為棉稈的能源化技術(shù)水平限制且規(guī)模較小導(dǎo)致成本居高不下。所以在棉稈能源化方面,需研發(fā)新技術(shù),提高能源轉(zhuǎn)化效率;從政府與社會層面加大棉稈能源化研發(fā)投入力度,實現(xiàn)棉稈能源化降本增效。

4 棉稈基料化

棉稈中含有纖維素、半纖維素和木質(zhì)素等主要組分與氮、磷、鉀等元素,其中纖維素、半纖維素和木質(zhì)素這些天然高分子難以自然分解,而真菌是天然的分解者,可以有效地分解棉稈中的天然高分子作為自身的營養(yǎng)來源[46]。目前,秸稈的基料化主要用于食用菌菇、蔬菜和花卉等的栽培。其中,秸稈基料化栽培食用菌應(yīng)用最為廣泛[47]。由于棉稈中的木質(zhì)素含量高于其他農(nóng)作物秸稈,所以棉稈常用于栽培平菇、香菇、木耳、金針菇和靈芝等木生菌[48]。

Li等[49]通過培養(yǎng)基優(yōu)化實驗篩選出在棉稈基質(zhì)中種植的蘇平1號平菇的最佳高產(chǎn)配方:培養(yǎng)基中棉稈顆粒直徑為0.75 mm,培養(yǎng)基中的固液比為1∶3,吐溫80含量為0.25 g·L-1,培養(yǎng)溫度為26 ℃。并分析了平菇Lacc1基因在棉稈木質(zhì)素降解過程中的分子作用機制,為了解白腐真菌降解木質(zhì)素的機理提供了參考。Li等[50]后續(xù)又探究了8種菌株對棉稈基質(zhì)木質(zhì)素降解率的影響,發(fā)現(xiàn)皖平1號、黑平A和蘇平1號在15 d內(nèi)對木質(zhì)素的降解率均大于13%。因此,這3種菌株具有在秸稈上正常生長和回收木質(zhì)素的潛力,可用于將木質(zhì)素轉(zhuǎn)化為反芻動物飼料,或作為生物質(zhì)能源工業(yè)中脫木質(zhì)素的預(yù)處理方法。Rashad等[51]用棉稈、蠶豆秸稈、玉米秸稈、水稻秸稈、甘蔗渣、小麥秸稈添加麥麩或玉米面筋來栽培靈芝,研究靈芝菌絲在這6種生物質(zhì)基料上的生長情況,發(fā)現(xiàn)以棉稈作為基料時,靈芝生長情況最佳;并且發(fā)現(xiàn)棉稈+水稻秸稈+甘蔗渣+麥麩組合下靈芝生長情況更佳,生物學(xué)效率為19.52%,靈芝產(chǎn)量為195.16 g·kg-1,蛋白質(zhì)含量為16.69%,多糖含量為3.613%,礦物質(zhì)含量為343.3 mg·kg-1,并且種植完的基料可用于土壤改良。

在棉稈基料化利用方面,研究可在棉稈基質(zhì)上正常生長的新型食用菌種與新型植物(如蔬菜、果樹和觀賞植物等),可增加棉稈基料化利用方面的商業(yè)價值,此外還可以將棉稈的基料化、飼料化和還田進行結(jié)合,構(gòu)建循環(huán)利用體系。秸稈的循環(huán)利用模式主要有飼料-肥料模式、沼氣-肥料模式、基料-肥料模式、生物炭-肥料模式,可進一步提高棉稈的綜合利用效率并促進秸稈資源的綜合利用與產(chǎn)業(yè)化發(fā)展[52]。

5 棉稈原料化

棉稈的木質(zhì)化程度高,其化學(xué)成分及含量接近于闊葉木材。與其他農(nóng)作物秸稈相比,棉稈具有與常見的硬木材相似的纖維特性。因此,棉稈可用于制造人造板材、紙張、包裝材料、建筑材料、保溫材料等[53]。此外,利用棉稈生產(chǎn)化學(xué)品也是原料化利用的1種途徑,常用于生產(chǎn)乙醇、5-羥甲基糠醛(5-hydroxymethyl furfural, 5-HMF)、乙酰丙酸、己二醇和乳酸等。

5.1 人造板材

棉稈纖維的長度較長、韌性強、質(zhì)量輕、附著力強、易結(jié)團,導(dǎo)致棉稈的加工較為困難。需先去除棉稈的皮層和髓心,再將其切成20~40 mm長的小段,干燥到含水率為15%以下,然后篩去棉稈段中的雜質(zhì)和塵土,加濕使其含水率在20%~25%,隨后將棉稈段刨成片狀,再將木質(zhì)部和韌皮纖維分離,將木質(zhì)部送入料倉備用[54]。

棉稈的粒徑與黏合劑對板材的機械性能具有重要影響。Nguyen等[55]研究了棉稈的粒徑和棉球殘留率對板材性能的影響。該研究使用可乳化的聚異氰酸酯(emulsifiable polymeric isocyanate, eMDI)作為黏合劑并使用4種不同的粒徑(6 mm、8 mm、10 mm和20 mm)與4種不同的棉球殘留率(0%、5%、10%和15%)的棉稈,結(jié)果表明,8 mm粒徑生產(chǎn)出的板材性能最佳;棉球殘留物對板材機械性能具有不利影響,應(yīng)盡量去除。Popescu等[56]使用生物衍生黏合劑代替市面上常用的但難以降解且易導(dǎo)致環(huán)境污染的黏合劑。以糠醇預(yù)聚物為原料,采用化學(xué)熱磨機械漿和呋喃樹脂濕法制備纖維板,纖維板的平均密度為9 560 kg·m-3。為改善黏結(jié)性能,加入了纖維素納米晶體和碳納米管,發(fā)現(xiàn)添加的纖維素納米晶體可通過改善纖維之間的結(jié)合提高復(fù)合材料的強度,增強纖維板的機械性能。

5.2 造紙

大多數(shù)造紙企業(yè)使用木材纖維生產(chǎn)紙漿與紙張,然而我國森林資源短缺,無法提供充足的木漿纖維用于造紙[5]。因此,使用非木材的農(nóng)作物廢棄物(如稻草、玉米秸稈、棉稈、甘蔗渣等)造紙可以大大緩解木材資源的短缺。其中棉稈纖維的平均長度為0.6~0.8 mm,平均直徑為0.02~0.03 mm。Afrifah等[57]研究發(fā)現(xiàn)采用纖維長徑比(長度與直徑比)大于33的原料制成的紙張,其撕裂強度大。因此,由棉稈制備的紙漿可以作為造紙原材料生產(chǎn)優(yōu)質(zhì)紙張[58]。

造紙過程中最重要的一步就是制漿,制漿的工藝包括機械制漿、化學(xué)制漿和半化學(xué)制漿?;瘜W(xué)制漿是最常用的制漿工藝,是將半纖維素和木質(zhì)素分解,最后得到纖維素。制漿需要去除木質(zhì)素與半纖維素,留下纖維素。秸稈相較于木材具有較高的纖維素含量與較低的木質(zhì)素含量,是制漿的良好選擇[59]。房桂干[60]利用化學(xué)與機械制漿法對棉稈、麥草和玉米秸稈的制漿性能進行了比較,發(fā)現(xiàn)棉稈的制漿得率與松厚度均最高,磨漿電耗最低。因此棉稈在制漿與造紙方面具有明顯的優(yōu)勢和良好的發(fā)展?jié)摿Α?/p>

5.3 棉稈生產(chǎn)乙醇

生物乙醇是石油、天然氣、煤等傳統(tǒng)化石燃料的良好替代品。在全球范圍內(nèi),美國是世界上最大的生物乙醇(原料為玉米)生產(chǎn)國,其次是巴西(原料為甘蔗)。由于以作物為原料生產(chǎn)乙醇面臨“與人爭糧,與糧爭地”的問題,農(nóng)作物秸稈在生物乙醇的生產(chǎn)中成為關(guān)注的熱點[61]。棉稈富含纖維素和半纖維素,作為原料生產(chǎn)乙醇具有很大的潛力[53]。Petrou等[62]使用玉米秸稈和棉稈為原料,通過相同的預(yù)處理、糖化和共發(fā)酵過程對二者的環(huán)境效益和經(jīng)濟效益進行對比,發(fā)現(xiàn)玉米秸稈的環(huán)境效益好,但棉稈的經(jīng)濟效益更優(yōu)。棉稈轉(zhuǎn)化為生物乙醇主要包括以下步驟:對棉稈進行預(yù)處理使得棉稈中各組分更容易分離;用酶催化或酸水解法將多糖轉(zhuǎn)化為單糖;單糖(己糖和戊糖)經(jīng)微生物發(fā)酵作用生成乙醇;分離和濃縮乙醇[63](圖2)。

預(yù)處理是棉稈生產(chǎn)生物乙醇中重要的一步。目前的預(yù)處理技術(shù)包括稀酸、堿、離子液體和生物預(yù)處理以及上述方法的聯(lián)合預(yù)處理,還可加上微波、超聲等輔助方法[64]。由于棉稈中的纖維素、半纖維素和木質(zhì)素之間形成了復(fù)雜且緊湊的網(wǎng)絡(luò)結(jié)構(gòu),并且木質(zhì)素的存在會阻礙纖維素和半纖維素的可及性,不經(jīng)過預(yù)處理直接轉(zhuǎn)化生物乙醇會導(dǎo)致產(chǎn)率低[65]。因此探索合理的預(yù)處理和微生物發(fā)酵途徑,提高木質(zhì)素的高值化利用程度,有望實現(xiàn)利用棉稈規(guī)?;a(chǎn)生物乙醇。

5.4 棉稈生產(chǎn)5-HMF

5-HMF是1種高附加值的平臺化合物,5-HMF分子的呋喃環(huán)上有1個醛基和羥甲基,性質(zhì)活潑,可以通過加氫、氧化、酯化、聚合、水解等反應(yīng),合成燃料、新型高分子、醫(yī)藥等,如2, 5-二甲基呋喃、2, 5-二羥甲基四氫呋喃、2, 5-呋喃二甲酸、乙酰丙酸、1, 6-己二醇等(圖3)。

利用棉稈制備5-HMF的步驟:首先,將棉稈進行預(yù)處理,去除半纖維素和木質(zhì)素等組分,保留纖維素;其次,將纖維素在質(zhì)子酸(布朗斯特酸,Bronsted acid)如HCl、H2SO4和H3PO4等的催化作用下,通過攻擊C-O-C鍵上的氧原子從而削弱β-1, 4糖苷鍵,使纖維素水解產(chǎn)生葡萄糖單體;葡萄糖在路易斯酸(Lewis acid),如AlCl3、CrCl3和BCl3等的催化作用下異構(gòu)化形成果糖(控速步驟);最后,在質(zhì)子酸的催化作用下,果糖脫水形成5-HMF[66-68](圖4)。其中需要重點關(guān)注的是棉稈預(yù)處理方法、纖維素轉(zhuǎn)化為5-HMF的催化劑和溶劑體系[69]。

5.4.1 預(yù)處理。預(yù)處理的主要目的是去除棉稈中除纖維素以外的組分(如半纖維素、木質(zhì)素和灰分等)。常見的預(yù)處理方法有酸、堿、離子液體和生物預(yù)處理,還有高壓、超聲波和微波等輔助預(yù)處理方法。半纖維素在酸性條件下發(fā)生水解,但木質(zhì)素在酸性條件下的溶解度較低;木質(zhì)素在氫氧化鈉溶液中表現(xiàn)出較高的溶解度[70]。所以可以進行酸-堿聯(lián)合預(yù)處理去除半纖維素和木質(zhì)素,還可以使用微波或超聲波達到更高的去除率。Cheng等[71]采用微波輔助堿/乙醇預(yù)處理方法在160 ℃下處理棉稈15 min,可去除大部分的半纖維素和木質(zhì)素。

離子液體可以通過破壞纖維素分子間的氫鍵,使得纖維素溶于離子液體,由結(jié)晶態(tài)變?yōu)闊o定形態(tài),增加纖維素的表面積,有利于纖維素與催化劑的接觸[72]。Xie等[73]采用1-丁基-3-甲基咪唑氯鹽對棉稈進行預(yù)處理,研究發(fā)現(xiàn),在液固比為10∶1、反應(yīng)溫度為120 ℃、反應(yīng)時間為5 h的條件下,酶促反應(yīng)后還原糖的得率為29.72%,顯著高于天然棉稈,預(yù)處理后的棉稈孔隙和裂紋明顯,結(jié)晶度低,便于后續(xù)的催化轉(zhuǎn)化。

5.4.2 催化劑。因為纖維素中的β-1, 4糖苷鍵和氫鍵構(gòu)成了緊密網(wǎng)絡(luò),致使纖維素不溶于水和大多數(shù)溶劑,并且具有較高的耐水解性[74]。Xu等[75]使用Hf/ZSM-5催化劑在120 min、190 ℃、加有NaCl的水/四氫呋喃(tetrahydrofuran, THF)雙相溶劑條件下催化纖維素轉(zhuǎn)化為5-HMF,其產(chǎn)率達到67.50%;額外添加AlCl3,5-HMF的產(chǎn)率高達70.95%。Hou等[76]先通過球磨預(yù)處理降低纖維素的結(jié)晶度,隨后使用具有路易斯酸與質(zhì)子酸雙功能的催化劑硫酸氧鈦(TiOSO4)催化纖維素轉(zhuǎn)化為5-HMF,5-HMF的產(chǎn)率為45.4%。因此研發(fā)具有最佳比例的質(zhì)子酸和路易斯酸催化劑對于提高5-HMF的產(chǎn)率至關(guān)重要[77]。

5.4.3 溶劑體系。將纖維素轉(zhuǎn)化為5-HMF的溶劑主要有單相溶劑體系、雙(多)相溶劑體系和離子液體溶劑體系這3大類。目前關(guān)于雙(多)相溶劑體系和離子液體溶劑體系的研究報道較多。Wu等[78]使用SnNb2O6-ZrO2催化劑在水/THF雙相溶劑體系中加入NaCl催化纖維素制備5-HMF,通過改變反應(yīng)溫度、反應(yīng)時間、NaCl用量和H2O/THF體積比,發(fā)現(xiàn)最佳條件下纖維素的轉(zhuǎn)化率高達85%,5-HMF的選擇性為41.8%,5-HMF的收率為35.5%。

6 棉稈的其他利用方式

棉稈還可制成生物炭用作吸附劑或超級電容器,還可制成作為復(fù)合材料的填料、氣凝膠和水凝膠等。

6.1 生物炭

6.1.1 吸附劑。生物炭是由生物質(zhì)材料在有限的氧氣環(huán)境下經(jīng)過熱處理或熱解獲得的材料。通過物理或化學(xué)手段對生物質(zhì)材料進行活化,獲得具有較大表面積和孔隙率的活性炭,可用于吸附重金屬離子(如鉛離子、鎘離子、汞離子和銅離子等)[79]。使用不同生物質(zhì)制備的生物炭對重金屬的吸附機制不同,并且熱解溫度對生物炭的吸附能力具有顯著影響[80]。在熱解時采用過低的溫度(<300 ℃)雖可獲得較高的生物炭產(chǎn)率,但生物炭結(jié)構(gòu)變化不明顯;在過高的溫度(>700 ℃)下生物炭產(chǎn)率較低,并且生物炭的微孔結(jié)構(gòu)會發(fā)生熔融,只有在合適的溫度下才能獲得較高的出炭率與良好的生物炭結(jié)構(gòu)[81-82]。Wang等[83]以棉稈為原料,利用熱解技術(shù)制備生物炭,發(fā)現(xiàn)在最佳條件(600 ℃,pH為5.5)下獲得的生物炭最大吸附容量為124.7 mg·g-1,還研究了不同操作條件下制備的生物炭對鉛離子的吸附效果,結(jié)果表明低溫下制成的生物炭的吸附過程以有機基團絡(luò)合與離子交換為主,吸附速率較小,但吸附容量較大;高溫下制成的生物炭的吸附過程涉及有機基團和無機鹽的相互作用,吸附速率較大。

除重金屬離子外,生物炭還可以用于吸附CO2。Pramanik等[84]以棉稈為原料,用KOH+明礬于700 ℃、90 min條件下采用一步法制備生物炭。其Brunauer-Emmett-Teller(BET)比表面積為2 695 m2·g-1,在273 K、1 bar條件下和298 K、1 bar條件下CO2吸附容量分別為6.90 mmol·g-1和4.24 mmol·g-1,可實現(xiàn)對CO2的有效吸附。此外,棉稈與污泥共熱解制備生物炭還可以增強土壤中重金屬的穩(wěn)定性,降低重金屬對環(huán)境的污染[85]。Wang等[86]使用K2CO3作為活化劑與污泥和棉稈共熱解,改善了生物炭的孔隙率,增加了生物炭的比表面積。此外,K2CO3活化顯著增加了生物炭中幾種重金屬的含量,并增強了重金屬的穩(wěn)定性,降低了重金屬的移動性和生物有效性,降低了重金屬所帶來的環(huán)境風(fēng)險。

6.1.2 超級電容器。超級電容器具有極長的循環(huán)壽命、快速充放電能力、無污染、高功率密度和良好的操作安全性等優(yōu)良性能。與普通電容器相比,超級電容器具有更大的電容和功率密度[87]。而生物基活性炭由于具有豐富的多孔結(jié)構(gòu)、較低的生產(chǎn)成本、高電導(dǎo)率和熱導(dǎo)率、強化學(xué)穩(wěn)定性、優(yōu)異的功率密度和良好的可逆性而被用作超級電容器的電極材料[88]?;钚蕴康目捉Y(jié)構(gòu)與比表面積是影響超級電容器性能的重要因素。Yan等[89]研究發(fā)現(xiàn)較大的比表面積與中等的孔體積賦予棉稈基碳材料最佳的電容?;钚蕴侩姌O材料的合成通常包括生物質(zhì)原料的碳化和活化過程,不同的活化劑會導(dǎo)致孔結(jié)構(gòu)、比表面積大小與官能團的改變,進而影響活性炭性能[90]。Cheng等[91]用棉稈為原料,使用KOH作為活化劑,發(fā)現(xiàn)KOH與炭的質(zhì)量比為2∶1時,活性炭材料的比電容最大。Guo等[92]以棉稈為原料,采用KOH與KMnO4雙重活化劑制備較大比表面積和高比電容的活性炭,并且在使用6 mol·L-1 KOH電解質(zhì)的雙電極系統(tǒng)中循環(huán)10 000次后僅有2%的電容耗散,證明其具有優(yōu)異的循環(huán)穩(wěn)定性。

6.2 填料

近年來,由于“限塑令”的實施,聚乳酸(polylactic acid, PLA)、聚丁二酸丁二醇酯(poly butylenes succinate, PBS)和聚己二酸對苯二甲酸丁二酯(polybutylene adipate terephthalate, PBAT)等可降解材料的研究受到了更為廣泛的關(guān)注。秸稈等農(nóng)作物廢棄物具有價格低廉、生物可降解性和可再生性等優(yōu)點,經(jīng)過處理后常用作復(fù)合材料的填料[93-94]。Raza等[95]將酸解棉紗制得的納米纖維素與聚乳酸復(fù)合,制成納米纖維素/聚乳酸復(fù)合膜。經(jīng)過分析發(fā)現(xiàn),納米纖維素的加入提高了聚乳酸膜的玻璃化轉(zhuǎn)變溫度,降低了熔融溫度和結(jié)晶溫度。結(jié)晶溫度降低表明復(fù)合膜內(nèi)分子鏈的運動能力增強;經(jīng)過力學(xué)測試發(fā)現(xiàn),復(fù)合膜的強度比聚乳酸膜更高。

此外,棉稈還可用于高性能水泥和混凝土的制備。低聚物可以作為1個很有前景的水泥替代品。Zhou等[96]對棉稈分別進行3種預(yù)處理后將其粉碎、過篩用于制備低聚物,結(jié)果表明棉稈粉末能有效提高低聚物的力學(xué)強度,但降低了其耐酸腐蝕性能。未經(jīng)處理的棉稈纖維降低了低聚物的密度與抗壓強度,略微增大了彎曲強度;對比3種預(yù)處理方式,堿處理的樣品力學(xué)性能最佳,壓縮強度和彎曲強度分別提高了4.8%和11.5%。Amin等[97]以納米棉稈灰與棕櫚葉灰為填料,按不同比例添加,制備超高性能的混凝土,發(fā)現(xiàn)當(dāng)棉稈灰與棕櫚葉灰的添加量分別為5%和20%時,水泥的最高抗壓強度為170.1 MPa,填料的加入在降低生產(chǎn)成本的同時還能提高水泥的性能。

6.3 氣凝膠

氣凝膠由于具有較大的孔隙率、低密度、較大的比表面積與良好的隔熱性能等顯著特點受到相關(guān)行業(yè)的關(guān)注[98]。近年來,由于生物基材料具有生物相容性、生物降解性和易于改性等特點,在氣凝膠的制備與應(yīng)用方面已得到較為廣泛的研究,并且在染料吸附、藥物遞送、組織工程、生物醫(yī)學(xué)與生物傳感器領(lǐng)域中得到廣泛應(yīng)用[99-101]。棉稈經(jīng)過處理后提取的納米纖維素可用于制備氣凝膠[102-103]。Mussana等[104]以棉稈為原料,采用離子液體/二甲基亞砜共溶劑體系制備纖維素氣凝膠,并對常規(guī)凍融和液氮凍融這2種凍融條件下的氣凝膠孔徑和比表面積進行了測定,研究發(fā)現(xiàn),與在-20 ℃下進行循環(huán)常規(guī)冷凍、20 ℃下緩慢解凍處理相比,在液氮中進行循環(huán)冷凍、20 ℃下緩慢解凍處理的氣凝膠具有更大的比表面積與更均勻、更小的孔徑。此外,共溶劑體系解決了離子液體成本高、離子液體/纖維素溶液體系粘度大等問題,對于氣凝膠的產(chǎn)業(yè)化發(fā)展具有重要作用。

6.4 水凝膠

水凝膠是由親水性聚合物鏈組成的1種三維網(wǎng)狀結(jié)構(gòu),可以儲存大量的水。水凝膠可以由天然高分子或合成高分子制備而成,天然高分子水凝膠具有低成本、良好的生物相容性和生物可降解性等優(yōu)點[105]。纖維素是天然的親水性高分子,可以從多種農(nóng)作物及農(nóng)作物廢棄物(如秸稈)中經(jīng)過預(yù)處理和提取得到,經(jīng)過不同的處理與改性手段可應(yīng)用于制備電池電解質(zhì)[106]、傷口敷料[107]和仿生電子皮膚[108]等或用來緩解植物干旱[109]等。

7 結(jié)語與展望

我國擁有豐富的棉稈資源,具有較大的市場潛力。棉稈資源的充分利用將會極大地推動棉花產(chǎn)業(yè)的發(fā)展,增加農(nóng)民收入。雖然我國在棉稈綜合利用方面積累了一定的經(jīng)驗,但目前仍處于初級階段。受制于技術(shù)與成本,現(xiàn)有的棉稈綜合利用市場規(guī)模較小,并且在應(yīng)用方面發(fā)展不均衡,集中于還田與飼料化領(lǐng)域,在其他方面發(fā)展較慢。在棉稈的收割、處理與儲運方面也缺乏相關(guān)的大型設(shè)備,導(dǎo)致棉稈收集成本高。部分企業(yè)無法優(yōu)化現(xiàn)有的生產(chǎn)工藝,過度依賴政府補貼。

因此,應(yīng)鼓勵利用棉稈生產(chǎn)高價值產(chǎn)品(如乙醇、5-HMF等)和可降解材料等技術(shù)的研發(fā),并注重成果轉(zhuǎn)化,使技術(shù)應(yīng)用到生產(chǎn)實際中。此外,棉稈綜合利用的激勵政策應(yīng)當(dāng)以補貼為主轉(zhuǎn)向市場驅(qū)動,推動規(guī)?;a(chǎn),起到降本增效的作用。把棉稈的多種利用模式有機地結(jié)合起來,形成多元化、多途徑的綜合利用方式,是實現(xiàn)棉稈資源化、高值化和產(chǎn)業(yè)化發(fā)展的重要途徑。在大力推行構(gòu)建固體廢棄物循環(huán)利用體系的政策背景下,棉稈的綜合利用迎來了巨大的機遇與挑戰(zhàn),抓住機遇,迎接挑戰(zhàn),發(fā)展棉稈綜合利用產(chǎn)業(yè),將成為推進鄉(xiāng)村振興、打造生態(tài)產(chǎn)業(yè)的重要途徑。

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(責(zé)任編輯:王小璐 責(zé)任校對:王國鑫)

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